Portugal · Multi-region weather view

Douro

Name: Douro weather and vintages
Creator: Weather & Vines

Terraced river vineyards spanning Baixo Corgo, Cima Corgo and Douro Superior.

Hot, dry summers intensify eastward while elevation and exposure create large local differences. Heat accumulation, water stress and rain near harvest are central to the season.

Climate comparisons use the 1991–2020 combined regional record · updated through Sep 13, 2026.

Current conditions

Observations through Sep 21, 2026 · 03:00 UTC

Temperature17.6°C

Dew Point8.1°C

Relative Humidity54%

24h Rainfall0.0 mmmodeled IFS total through Sep 20

Vintage explorer

Moderately warmer and significantly drier than normal.

Mean temperature19.3°C

Temperature anomaly+2.0°Cvs 1991-2020

Growing degree days1710base 10°C

Hot days7≥ 35°C

What stood out in 2026

Warm weather can speed ripening and leave grapes with less acidity. Less rain often lowers disease pressure, but vines may depend more on stored soil water or irrigation.

Warmer growing season · High confidence

Mean growing-season temperature was +2.0°C versus the 1991–2020 baseline.

Warm weather can speed ripening and leave grapes with less acidity.

Drier than baseline · Moderate confidence

Growing-season precipitation was 131 mm below the 1991–2020 baseline.

Less rain often lowers disease pressure, but vines may depend more on stored soil water or irrigation.

2026 month by month

Replay the 2026 growing season

Closest weather matches

How similar years are calculated

Method analog-v1-2026-07 standardizes six weather measures across 0 complete ARCO ERA5 comparison years, then measures the distance between them. The calculation runs when the page is requested.

Growing-season temperature anomalyCompared with 1991-2020

Growing-season rainfall anomaly

View historical chart data as a table

Year	Temperature anomaly	Rainfall anomaly	Hot days
1991	+0.2°C	-143 mm	9
1992	-0.5°C	-41 mm	5
1993	-1.5°C	+287 mm	2
1994	-0.6°C	-37 mm	0
1995	+0.5°C	-102 mm	1
1996	-0.5°C	-21 mm	0
1997	+0.3°C	+56 mm	0
1998	-0.2°C	+136 mm	3
1999	-0.2°C	+75 mm	0
2000	-0.8°C	+88 mm	0
2001	-0.1°C	+11 mm	1
2002	-0.6°C	+11 mm	0
2003	+0.7°C	+69 mm	6
2004	-0.1°C	-70 mm	0
2005	+0.9°C	-88 mm	4
2006	+0.9°C	+25 mm	2
2007	-0.8°C	-9 mm	1
2008	-1.2°C	+36 mm	0
2009	+0.2°C	-141 mm	0
2010	+0.4°C	+21 mm	1
2011	+0.8°C	-114 mm	0
2012	-0.4°C	-50 mm	2
2013	-0.1°C	+58 mm	6
2014	-0.2°C	+80 mm	0
2015	+0.5°C	-21 mm	1
2016	+0.1°C	+106 mm	3
2017	+1.2°C	-162 mm	4
2018	+0.1°C	+45 mm	4
2019	+0.1°C	-74 mm	0
2020	+0.7°C	-30 mm	2
2021	-0.2°C	-11 mm	1
2022	+1.6°C	-98 mm	13
2023	+1.2°C	-31 mm	4
2024	+0.4°C	+80 mm	4
2025	+1.1°C	-44 mm	14
2026	+2.0°C	-131 mm	7

winter

7.5°C

+0.7°C vs baseline

499 mm rain · +251 mm

spring

14.2°C

+1.8°C vs baseline

157 mm rain · -56 mm

summer

22.6°C

+1.7°C vs baseline

60 mm rain · -5 mm

harvest

21.6°C

+3.0°C vs baseline

44 mm rain · -51 mm

Weather events

1991–present

Climate change

Measured regional trends are shown separately from model projections. The observed record ends at the latest complete growing season shared by every published region.

Compare regions

Observed record

Historical trends, 1991–2025

Growing degree days changed +73.7 GDD per decade. The 95% interval is +46.7 to +100.7 GDD per decade, based on 35 eligible vintages.

How it is measured: Across the March 15–October 15 growing season, each day's mean temperature above 10°C adds to the total; cooler days add zero.

Growing degree days · annual change from the 1991–2020 average1991–2025

Scroll horizontally to inspect the full timeline.

View annual growing degree days data

Vintage	Growing degree days	Change from 1991–2020
1991	1648 GDD	+46 GDD
1992	1515 GDD	-87 GDD
1993	1296 GDD	-307 GDD
1994	1474 GDD	-128 GDD
1995	1708 GDD	+105 GDD
1996	1490 GDD	-112 GDD
1997	1641 GDD	+39 GDD
1998	1577 GDD	-25 GDD
1999	1551 GDD	-52 GDD
2000	1465 GDD	-137 GDD
2001	1574 GDD	-29 GDD
2002	1476 GDD	-127 GDD
2003	1722 GDD	+119 GDD
2004	1608 GDD	+6 GDD
2005	1768 GDD	+165 GDD
2006	1758 GDD	+156 GDD
2007	1441 GDD	-161 GDD
2008	1365 GDD	-237 GDD
2009	1647 GDD	+44 GDD
2010	1685 GDD	+83 GDD
2011	1749 GDD	+147 GDD
2012	1538 GDD	-64 GDD
2013	1597 GDD	-5 GDD
2014	1558 GDD	-44 GDD
2015	1703 GDD	+101 GDD
2016	1639 GDD	+36 GDD
2017	1867 GDD	+265 GDD
2018	1655 GDD	+53 GDD
2019	1614 GDD	+12 GDD
2020	1743 GDD	+141 GDD
2021	1538 GDD	-65 GDD
2022	1925 GDD	+323 GDD
2023	1840 GDD	+237 GDD
2024	1693 GDD	+91 GDD
2025	1821 GDD	+218 GDD

Growing-season mean temperature: +0.36 °C per decade 95% interval +0.22 to +0.50
Growing degree days: +73.68 GDD per decade 95% interval +46.69 to +100.67
Growing-season precipitation: -14.73 mm per decade 95% interval -37.08 to +7.62
Hot days: +1.03 days per decade 95% interval -0.57 to +2.63
Spring frost days: +0.08 days per decade 95% interval -0.37 to +0.53
Longest dry spell: +4.54 days per decade 95% interval +1.06 to +8.02

Last Updated September 12, 2026

Model ensemble

Projected climate through 2075

Temperature changes are relative to each model’s 1991–2020 baseline. The table combines all three pathways, weighted 70% to SSP2-4.5 and 15% each to SSP1-2.6 and SSP3-7.0.

Scroll horizontally to compare all columns.

Period	Weighted median	Weighted central 80%	Models per pathway
2021-2040	+1.0°C	+0.6 to +1.6°C	25
2041-2060	+1.6°C	+1.2 to +2.4°C	25
2061-2075	+2.1°C	+1.6 to +3.1°C	25

How pathways are combined

For each period and percentile, Weather & Vines takes 70% of the SSP2-4.5 value, 15% of the SSP1-2.6 value, and 15% of the SSP3-7.0 value. Each pathway contains the same 25 models. The weights are an editorial view of the current trajectory, not scenario probabilities.

Last Updated June 29, 2025

Compare projection measures across regions

Typical year · 1991–2020

When to visit

This calendar describes typical regional weather under the selected climate baseline. It is not a forecast for a future trip, and it does not account for crowds, lodging, events, or vineyard access.

Deterministic IFS forecast

Next ten days

Detailed forecast outlook

ECMWF IFS 0.25° via Herbie · model run Sep 20, 2026 at 00:00 UTC · retrieved Sep 21, 2026 at 03:17 UTC

Scroll horizontally to see all forecast dates.

Date	MonSep 21	TueSep 22	WedSep 23	ThuSep 24	FriSep 25	SatSep 26	SunSep 27	MonSep 28	TueSep 29	WedSep 30
High	33°C	33°C	34°C	33°C	29°C	26°C	27°C	27°C	28°C	17°C
Low	16°C	16°C	17°C	16°C	13°C	12°C	15°C	15°C	16°C	17°C
Rain	0.0 mm	0.0 mm	0.0 mm	0.0 mm	0.0 mm	0.0 mm	0.0 mm	0.6 mm	0.4 mm	0.0 mm

Across the typical year: Late July has the warmest median afternoon high (29.1°C); Early January has the coolest (9.8°C). Wet days are most frequent in Late October (44%) and least frequent in Late July (9%). Ties are resolved by calendar order.

Typical afternoon highs and overnight lowsMedians and middle 50% of daily readings

Afternoon highOvernight lowMiddle 50%

Scroll horizontally to inspect all 24 half-month periods.

How often a day is wetShare of days with at least 1 mm of rain

Scroll horizontally to inspect all 24 half-month periods.

View all 24 periods as a table

Scroll horizontally to view all columns.

Douro typical weather by half-month, 1991–2020
Period	Afternoon high, median (middle 50%)	Overnight low, median (middle 50%)	Wet-day frequency	Period rain, median (middle 50%)
Jan 1–15	9.8°C (7.9–11.3°C)	2.7°C (-0.3–5.7°C)	39%	36.6 mm (13.9–82.1 mm)
Jan 16–31	10.0°C (8.5–11.5°C)	2.2°C (0.1–5.1°C)	34%	36.9 mm (7.8–51.7 mm)
Feb 1–15	11.7°C (9.4–13.6°C)	2.9°C (0.9–5.5°C)	31%	19.1 mm (9.6–43.7 mm)
Feb 16–29	12.2°C (9.9–14.8°C)	3.1°C (1.1–5.2°C)	31%	16.8 mm (6.9–38.3 mm)
Mar 1–15	14.0°C (11.8–17.2°C)	5.1°C (3.0–6.7°C)	30%	18.6 mm (7.6–37.9 mm)
Mar 16–31	15.3°C (12.5–18.9°C)	6.2°C (4.2–7.6°C)	36%	29.0 mm (9.4–54.6 mm)
Apr 1–15	15.9°C (13.0–19.8°C)	6.5°C (4.3–8.5°C)	40%	33.5 mm (20.7–56.6 mm)
Apr 16–30	16.4°C (13.6–20.4°C)	7.6°C (5.6–9.4°C)	42%	30.8 mm (18.0–51.6 mm)
May 1–15	18.6°C (15.8–22.4°C)	9.0°C (7.2–10.8°C)	40%	34.8 mm (14.7–45.9 mm)
May 16–31	21.7°C (18.0–25.4°C)	10.9°C (9.0–12.7°C)	34%	26.1 mm (12.0–49.7 mm)
Jun 1–15	23.6°C (19.9–27.2°C)	12.3°C (10.5–14.3°C)	24%	12.6 mm (6.1–24.5 mm)
Jun 16–30	26.6°C (23.4–29.7°C)	14.2°C (12.3–16.0°C)	19%	9.5 mm (6.2–15.9 mm)
Jul 1–15	27.4°C (24.4–30.4°C)	14.6°C (13.0–16.6°C)	15%	6.2 mm (3.8–13.9 mm)
Jul 16–31	29.1°C (26.7–31.5°C)	15.9°C (14.2–17.3°C)	9%	4.8 mm (2.3–8.3 mm)
Aug 1–15	28.7°C (26.1–31.7°C)	15.5°C (13.8–17.2°C)	13%	4.9 mm (0.9–9.1 mm)
Aug 16–31	27.7°C (25.2–30.1°C)	14.9°C (13.4–16.5°C)	16%	10.7 mm (1.9–18.9 mm)
Sep 1–15	26.2°C (23.5–28.3°C)	14.0°C (12.4–15.4°C)	16%	8.2 mm (2.9–23.4 mm)
Sep 16–30	22.7°C (19.9–25.7°C)	12.2°C (10.5–13.9°C)	27%	27.1 mm (8.0–42.2 mm)
Oct 1–15	20.5°C (17.5–23.1°C)	10.6°C (8.8–12.6°C)	31%	28.9 mm (18.1–46.8 mm)
Oct 16–31	17.3°C (15.0–19.7°C)	9.8°C (7.0–11.9°C)	44%	62.8 mm (32.0–92.3 mm)
Nov 1–15	14.4°C (12.3–16.2°C)	6.7°C (4.4–9.3°C)	39%	39.9 mm (24.5–69.4 mm)
Nov 16–30	11.8°C (10.1–13.7°C)	4.4°C (2.1–6.9°C)	39%	41.8 mm (14.0–68.4 mm)
Dec 1–15	10.5°C (9.0–12.0°C)	3.8°C (1.2–6.2°C)	32%	39.6 mm (23.6–57.0 mm)
Dec 16–31	9.8°C (8.3–11.4°C)	2.9°C (0.1–6.4°C)	38%	37.2 mm (16.8–101.8 mm)

Each year contributes to temperature or rain separately when at least 90% of that period’s days are present. A value is shown only when at least 80% of the baseline years qualify. February 29 is included in late February.

Historical climatology Last Updated September 12, 2026

Season to date

Growing season heat and rainfall

Mar 15–Sep 20, 2026

Compare this season across regions →

Growing degree days1710.2base 10°C

Growing-season rainfall196.1 mmweighted regional total

Cumulative growing degree daysBase 10°C

2026 season1991–2020 average

Cumulative growing-season rainfallRegional weighted mean

2026 season1991–2020 average

View growing-season accumulation data

Date	Season GDD	1991–2020 average GDD	Season rainfall	1991–2020 average rainfall
2026-03-15	0.0	1.4	0.0 mm	1.2 mm
2026-03-16	1.7	3.1	0.0 mm	2.8 mm
2026-03-17	5.1	4.6	0.0 mm	4.8 mm
2026-03-18	8.6	6.5	0.3 mm	5.7 mm
2026-03-19	12.8	8.5	0.7 mm	7.5 mm
2026-03-20	14.9	10.4	2.8 mm	9.2 mm
2026-03-21	17.1	11.9	3.0 mm	11.2 mm
2026-03-22	19.6	13.5	3.0 mm	13.0 mm
2026-03-23	21.9	15.0	3.0 mm	15.3 mm
2026-03-24	24.0	16.7	3.0 mm	17.6 mm
2026-03-25	27.4	18.1	3.0 mm	20.4 mm
2026-03-26	27.8	19.3	3.0 mm	24.0 mm
2026-03-27	28.4	20.8	3.0 mm	25.6 mm
2026-03-28	29.2	22.0	3.0 mm	27.7 mm
2026-03-29	29.2	23.7	3.0 mm	31.0 mm
2026-03-30	30.2	25.4	3.0 mm	34.0 mm
2026-03-31	33.9	27.2	3.0 mm	36.8 mm
2026-04-01	36.8	28.9	3.0 mm	40.8 mm
2026-04-02	39.6	30.3	3.0 mm	44.1 mm
2026-04-03	42.9	31.9	3.0 mm	47.2 mm
2026-04-04	49.0	33.5	3.0 mm	49.5 mm
2026-04-05	55.9	35.6	3.0 mm	51.7 mm
2026-04-06	64.5	38.0	4.4 mm	54.0 mm
2026-04-07	68.3	40.5	14.1 mm	55.6 mm
2026-04-08	69.8	42.8	23.5 mm	57.6 mm
2026-04-09	75.5	45.2	24.0 mm	60.2 mm
2026-04-10	85.0	47.5	24.2 mm	62.9 mm
2026-04-11	88.4	49.9	24.3 mm	64.6 mm
2026-04-12	88.4	51.9	24.5 mm	66.8 mm
2026-04-13	88.4	54.3	25.0 mm	68.6 mm
2026-04-14	91.5	56.7	25.2 mm	72.0 mm
2026-04-15	95.1	59.0	25.2 mm	75.2 mm
2026-04-16	100.1	61.2	25.3 mm	78.0 mm
2026-04-17	105.7	63.4	25.3 mm	80.2 mm
2026-04-18	113.4	65.8	25.4 mm	83.9 mm
2026-04-19	120.9	68.0	25.7 mm	88.2 mm
2026-04-20	128.3	70.6	25.8 mm	90.4 mm
2026-04-21	137.0	73.1	28.4 mm	93.1 mm
2026-04-22	142.7	75.5	28.6 mm	95.7 mm
2026-04-23	149.6	78.4	30.2 mm	97.5 mm
2026-04-24	155.9	81.4	31.1 mm	100.0 mm
2026-04-25	162.5	84.6	35.3 mm	103.2 mm
2026-04-26	170.1	87.5	36.4 mm	105.1 mm
2026-04-27	178.3	90.6	37.2 mm	106.8 mm
2026-04-28	185.8	93.6	46.5 mm	108.0 mm
2026-04-29	190.3	96.4	62.8 mm	110.2 mm
2026-04-30	194.4	99.3	63.1 mm	112.2 mm
2026-05-01	199.3	102.2	63.2 mm	114.1 mm
2026-05-02	203.5	105.8	69.1 mm	115.8 mm
2026-05-03	207.0	109.8	73.0 mm	117.6 mm
2026-05-04	209.3	113.8	74.0 mm	119.8 mm
2026-05-05	209.9	117.6	75.3 mm	122.3 mm
2026-05-06	211.5	121.4	75.4 mm	124.2 mm
2026-05-07	214.7	125.4	76.3 mm	126.3 mm
2026-05-08	217.3	129.7	83.0 mm	129.5 mm
2026-05-09	219.9	134.1	92.3 mm	131.6 mm
2026-05-10	222.1	138.6	99.9 mm	134.3 mm
2026-05-11	225.6	142.8	107.2 mm	137.2 mm
2026-05-12	228.6	147.2	116.4 mm	140.0 mm
2026-05-13	232.0	151.7	117.9 mm	142.0 mm
2026-05-14	234.8	156.3	117.9 mm	144.5 mm
2026-05-15	236.8	161.5	118.4 mm	146.0 mm
2026-05-16	239.3	167.1	118.4 mm	148.8 mm
2026-05-17	242.3	172.6	118.6 mm	151.5 mm
2026-05-18	245.5	177.9	118.6 mm	153.7 mm
2026-05-19	250.0	182.8	119.1 mm	155.7 mm
2026-05-20	258.0	188.0	119.1 mm	157.6 mm
2026-05-21	269.7	193.9	119.1 mm	159.4 mm
2026-05-22	283.1	200.1	120.0 mm	162.4 mm
2026-05-23	294.2	206.7	125.0 mm	164.6 mm
2026-05-24	306.0	213.1	129.7 mm	167.0 mm
2026-05-25	318.7	219.3	130.0 mm	168.8 mm
2026-05-26	330.7	225.9	130.0 mm	170.3 mm
2026-05-27	345.6	232.6	130.7 mm	171.9 mm
2026-05-28	360.0	239.6	130.7 mm	173.6 mm
2026-05-29	372.9	247.0	130.9 mm	175.7 mm
2026-05-30	384.9	254.6	130.9 mm	177.4 mm
2026-05-31	396.2	262.5	130.9 mm	178.9 mm
2026-06-01	406.8	270.5	130.9 mm	180.7 mm
2026-06-02	415.1	278.4	131.0 mm	181.3 mm
2026-06-03	422.9	286.3	131.1 mm	181.7 mm
2026-06-04	429.3	293.7	131.2 mm	182.6 mm
2026-06-05	433.7	300.9	131.2 mm	183.7 mm
2026-06-06	442.0	308.6	131.3 mm	185.8 mm
2026-06-07	451.6	316.5	131.3 mm	187.1 mm
2026-06-08	459.8	323.9	131.3 mm	188.4 mm
2026-06-09	468.5	331.0	131.3 mm	190.3 mm
2026-06-10	476.8	338.0	131.3 mm	191.7 mm
2026-06-11	488.1	346.0	131.3 mm	192.2 mm
2026-06-12	502.5	354.8	131.3 mm	192.9 mm
2026-06-13	517.1	364.0	132.5 mm	193.5 mm
2026-06-14	530.3	373.1	134.8 mm	195.2 mm
2026-06-15	541.6	382.3	135.1 mm	195.9 mm
2026-06-16	554.2	391.5	135.3 mm	197.2 mm
2026-06-17	568.3	400.8	137.0 mm	198.3 mm
2026-06-18	582.3	410.8	138.5 mm	198.9 mm
2026-06-19	594.8	421.2	138.5 mm	199.4 mm
2026-06-20	609.2	431.5	138.7 mm	199.9 mm
2026-06-21	626.3	441.9	138.9 mm	200.6 mm
2026-06-22	643.2	452.8	140.2 mm	201.2 mm
2026-06-23	661.0	463.3	140.3 mm	202.2 mm
2026-06-24	677.4	473.7	141.5 mm	202.8 mm
2026-06-25	688.6	484.3	145.5 mm	203.5 mm
2026-06-26	700.4	494.8	146.9 mm	204.0 mm
2026-06-27	711.9	505.2	146.9 mm	204.8 mm
2026-06-28	722.9	515.6	146.9 mm	205.7 mm
2026-06-29	736.6	526.1	146.9 mm	206.8 mm
2026-06-30	751.7	536.8	146.9 mm	208.1 mm
2026-07-01	767.3	546.8	146.9 mm	209.1 mm
2026-07-02	782.4	556.2	146.9 mm	209.7 mm
2026-07-03	799.3	565.9	146.9 mm	210.1 mm
2026-07-04	816.9	575.9	146.9 mm	210.9 mm
2026-07-05	834.5	585.9	146.9 mm	211.6 mm
2026-07-06	852.1	596.5	147.0 mm	212.3 mm
2026-07-07	867.2	607.3	147.0 mm	212.8 mm
2026-07-08	881.8	618.5	147.0 mm	213.9 mm
2026-07-09	895.7	630.3	147.0 mm	214.7 mm
2026-07-10	909.5	642.0	147.1 mm	215.0 mm
2026-07-11	924.3	653.5	147.3 mm	215.3 mm
2026-07-12	935.2	665.5	148.0 mm	215.6 mm
2026-07-13	945.4	677.6	148.0 mm	216.2 mm
2026-07-14	957.6	690.0	148.2 mm	216.7 mm
2026-07-15	969.2	702.2	148.2 mm	218.3 mm
2026-07-16	980.4	714.6	148.7 mm	219.3 mm
2026-07-17	991.1	727.2	148.8 mm	219.4 mm
2026-07-18	1003.4	739.5	148.9 mm	219.5 mm
2026-07-19	1016.2	751.9	148.9 mm	220.1 mm
2026-07-20	1029.0	763.6	148.9 mm	220.4 mm
2026-07-21	1042.8	775.4	149.0 mm	220.6 mm
2026-07-22	1056.9	787.4	149.0 mm	221.4 mm
2026-07-23	1069.2	799.8	149.0 mm	222.1 mm
2026-07-24	1079.1	811.8	149.9 mm	222.5 mm
2026-07-25	1089.8	824.0	150.3 mm	222.8 mm
2026-07-26	1100.9	836.4	150.3 mm	223.1 mm
2026-07-27	1115.6	848.9	150.3 mm	223.6 mm
2026-07-28	1131.9	861.6	150.3 mm	223.8 mm
2026-07-29	1147.4	874.4	150.3 mm	224.1 mm
2026-07-30	1160.8	886.9	150.3 mm	224.5 mm
2026-07-31	1172.5	899.4	150.3 mm	224.9 mm
2026-08-01	1186.6	911.4	150.3 mm	225.2 mm
2026-08-02	1199.1	923.5	150.4 mm	225.6 mm
2026-08-03	1210.7	935.9	150.6 mm	226.0 mm
2026-08-04	1222.2	948.3	150.9 mm	226.3 mm
2026-08-05	1234.9	960.9	150.9 mm	226.5 mm
2026-08-06	1248.3	973.5	150.9 mm	227.1 mm
2026-08-07	1261.7	985.6	150.9 mm	228.0 mm
2026-08-08	1276.2	997.4	151.6 mm	228.9 mm
2026-08-09	1288.3	1009.2	151.6 mm	229.7 mm
2026-08-10	1301.3	1021.1	151.6 mm	230.6 mm
2026-08-11	1315.6	1033.1	151.6 mm	231.0 mm
2026-08-12	1331.6	1045.1	151.6 mm	231.3 mm
2026-08-13	1347.7	1057.2	151.6 mm	231.4 mm
2026-08-14	1363.2	1069.5	151.8 mm	231.6 mm
2026-08-15	1377.4	1081.5	152.2 mm	232.1 mm
2026-08-16	1392.8	1093.1	152.3 mm	232.7 mm
2026-08-17	1409.9	1104.8	152.3 mm	233.6 mm
2026-08-18	1427.6	1116.5	152.3 mm	234.5 mm
2026-08-19	1442.7	1128.1	152.4 mm	234.8 mm
2026-08-20	1454.1	1139.9	153.2 mm	235.2 mm
2026-08-21	1463.7	1151.6	153.2 mm	235.5 mm
2026-08-22	1474.8	1163.0	153.2 mm	236.0 mm
2026-08-23	1486.2	1174.5	153.7 mm	236.5 mm
2026-08-24	1495.3	1185.7	162.9 mm	238.0 mm
2026-08-25	1505.0	1196.8	165.1 mm	238.8 mm
2026-08-26	1511.9	1207.6	175.6 mm	239.9 mm
2026-08-27	1516.7	1218.6	190.4 mm	241.4 mm
2026-08-28	1523.3	1229.3	190.9 mm	242.6 mm
2026-08-29	1531.8	1239.5	190.9 mm	243.1 mm
2026-08-30	1541.8	1250.1	191.1 mm	243.8 mm
2026-08-31	1550.5	1260.8	191.1 mm	244.3 mm
2026-09-01	1560.5	1271.3	191.1 mm	245.6 mm
2026-09-02	1572.9	1282.1	191.1 mm	246.0 mm
2026-09-03	1587.7	1293.0	191.1 mm	246.5 mm
2026-09-04	1602.5	1303.7	191.1 mm	247.0 mm
2026-09-05	1618.5	1313.8	191.4 mm	248.3 mm
2026-09-06	1633.1	1324.2	191.4 mm	249.3 mm
2026-09-07	1646.3	1333.9	191.4 mm	250.9 mm
2026-09-08	1656.3	1343.5	196.0 mm	252.3 mm
2026-09-09	1665.7	1353.1	196.1 mm	252.9 mm
2026-09-10	1673.5	1362.6	196.1 mm	253.5 mm
2026-09-11	1684.4	1372.1	196.1 mm	254.0 mm
2026-09-12	1696.7	1381.4	196.1 mm	254.3 mm
2026-09-13	1710.2	1390.2	196.1 mm	255.4 mm

Forecast outlook

ECMWF IFS 0.25° via Herbie · run Sep 20, 2026 at 00:00 UTC

10-day totals compared with the 1991–2020 combined regional record

GDD accumulation: 118 GDDvs 71 GDD average
Total rainfall: 0.9 mmvs 21.1 mm average

No unusually hot or wet period stands out in the short-range forecast.

Mon9/21 33°Cavg 23°C 16°Cavg 13°C +14 GDD 0.0 mm

Tue9/22 33°Cavg 23°C 16°Cavg 12°C +14 GDD 0.0 mm

Wed9/23 34°Cavg 23°C 17°Cavg 12°C +15 GDD 0.0 mm

Thu9/24 33°Cavg 22°C 16°Cavg 12°C +14 GDD 0.0 mm

Fri9/25 29°Cavg 21°C 13°Cavg 11°C +10 GDD 0.0 mm

Sat9/26 26°Cavg 22°C 12°Cavg 11°C +9 GDD 0.0 mm

Sun9/27 27°Cavg 22°C 15°Cavg 11°C +11 GDD 0.0 mm

Mon9/28 27°Cavg 23°C 15°Cavg 12°C +11 GDD 0.6 mm

Tue9/29 28°Cavg 23°C 16°Cavg 12°C +12 GDD 0.4 mm

Wed9/30 17°Cavg 22°C 17°Cavg 12°C +7 GDD 0.0 mm

Data and methods

Show data sources and model assumptions

Current model conditions and the 10-day outlook use the 00 UTC deterministic ECMWF IFS 0.25° public forecast retrieved directly with Herbie. Historical temperature and rain combine qualifying GHCN-D stations with ERA5 by geographic area; a missing station day uses the nearest ERA5 value for that station's area. Climate comparisons use 1991–2020.

Forecast comparisons use the 1991–2020 combined regional daily record. Daily high and low averages use the matching date; rainfall and GDD sum the same calendar dates as the forecast period.

This service is based on data and products of the European Centre for Medium-Range Weather Forecasts (ECMWF). Weather & Vines subsets, converts, and regionally weights the forecast fields. ECMWF data are published under CC BY 4.0. ECMWF accepts no liability for errors, omissions, availability, loss, or damage arising from their use.

Climate projections use NASA NEX-GDDP-CMIP6 v2.0, accessed September 20, 2026, with 25 models. Weather & Vines subsets and aggregates the source fields. Source files and derived projection data are under CC BY-SA 4.0; the full roster and limitations are listed in the climate atlas methods.

The Douro model uses a March 15–October 15 growing season, base 10°C GDD, and an operational hot-day marker of 35°C.