Italy · Detailed regional profile

Piedmont

A northwestern Italian region known for Nebbiolo, Barbera, Dolcetto, and several aromatic white grapes.

The Alps, fog, hail, and autumn weather all matter in a growing season that often runs late.

Climate comparisons use the 1991–2020 combined regional record · updated through Aug 20, 2026.

Vineyards and a village in Piedmont, Italy — Mauro Sassano / Pexels

Current conditions

Observations through Aug 30, 2026 · 06:00 UTC

Temperature20.0°C

Dew Point16.4°C

Relative Humidity80%

24h Rainfall0.0 mmmodeled IFS total through Aug 29

Vintage explorer

Moderately cooler and significantly drier than normal.

Mean temperature22.0°C

Temperature anomaly+3.2°Cvs 1991-2020

Growing degree days1738base 10°C

Hot days16≥ 34°C

What stood out in 2026

Warm weather can speed ripening and leave grapes with less acidity. Repeated hot days can speed ripening and put vines under stress. 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 +3.2°C versus the 1991–2020 baseline.

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

More hot days than usual · High confidence

There were 16 days at or above 34°C—+14 days versus baseline.

Repeated hot days can speed ripening and put vines under stress.

Drier than baseline · Moderate confidence

Growing-season precipitation was 488 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	-0.9°C	-112 mm	1
1992	-1.3°C	+240 mm	0
1993	-1.0°C	+207 mm	0
1994	-0.6°C	+60 mm	1
1995	-0.8°C	+76 mm	0
1996	-1.2°C	+10 mm	0
1997	-0.1°C	-235 mm	0
1998	-0.1°C	-1 mm	4
1999	+0.2°C	+50 mm	0
2000	+0.0°C	+277 mm	0
2001	+0.1°C	-113 mm	0
2002	-0.8°C	+275 mm	0
2003	+1.4°C	-337 mm	18
2004	-0.2°C	-125 mm	0
2005	+0.1°C	-61 mm	0
2006	+0.7°C	-115 mm	7
2007	+0.2°C	-133 mm	0
2008	-0.4°C	+44 mm	0
2009	+0.7°C	-16 mm	0
2010	-0.7°C	+127 mm	0
2011	+0.9°C	-230 mm	4
2012	+0.0°C	-4 mm	2
2013	-0.2°C	+143 mm	0
2014	-0.1°C	+46 mm	0
2015	+0.4°C	+45 mm	4
2016	+0.2°C	-92 mm	0
2017	+1.0°C	-248 mm	4
2018	+1.2°C	+147 mm	0
2019	+0.7°C	+63 mm	5
2020	+0.5°C	+11 mm	3
2021	+0.4°C	-173 mm	3
2022	+2.5°C	-211 mm	16
2023	+1.8°C	+19 mm	13
2024	+0.3°C	+275 mm	0
2025	+0.5°C	+35 mm	3
2026	+3.2°C	-488 mm	16

winter

5.5°C

+1.5°C vs baseline

280 mm rain · +79 mm

spring

14.3°C

+1.3°C vs baseline

220 mm rain · -92 mm

summer

25.8°C

+3.1°C vs baseline

133 mm rain · -130 mm

harvest

Incomplete seasonal record

Temperature and rainfall are withheld for this window.

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 +113.2 GDD per decade. The 95% interval is +77.1 to +149.2 GDD per decade, based on 35 eligible vintages.

How it is measured: Across the April 1–October 31 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	1736 GDD	-145 GDD
1992	1631 GDD	-251 GDD
1993	1666 GDD	-215 GDD
1994	1773 GDD	-109 GDD
1995	1695 GDD	-186 GDD
1996	1624 GDD	-258 GDD
1997	1870 GDD	-11 GDD
1998	1876 GDD	-6 GDD
1999	1915 GDD	+33 GDD
2000	1878 GDD	-3 GDD
2001	1901 GDD	+20 GDD
2002	1697 GDD	-184 GDD
2003	2225 GDD	+344 GDD
2004	1838 GDD	-44 GDD
2005	1884 GDD	+3 GDD
2006	2009 GDD	+128 GDD
2007	1922 GDD	+41 GDD
2008	1797 GDD	-85 GDD
2009	2029 GDD	+147 GDD
2010	1750 GDD	-132 GDD
2011	2064 GDD	+182 GDD
2012	1892 GDD	+11 GDD
2013	1837 GDD	-44 GDD
2014	1847 GDD	-35 GDD
2015	1951 GDD	+70 GDD
2016	1909 GDD	+28 GDD
2017	2090 GDD	+208 GDD
2018	2128 GDD	+246 GDD
2019	2024 GDD	+143 GDD
2020	1984 GDD	+103 GDD
2021	1965 GDD	+84 GDD
2022	2408 GDD	+527 GDD
2023	2256 GDD	+375 GDD
2024	1941 GDD	+59 GDD
2025	1982 GDD	+100 GDD

Growing-season mean temperature: +0.56 °C per decade 95% interval +0.39 to +0.73
Growing degree days: +113.16 GDD per decade 95% interval +77.15 to +149.18
Growing-season precipitation: -13.81 mm per decade 95% interval -60.19 to +32.58
Hot days: +1.43 days per decade 95% interval +0.18 to +2.67
Spring frost days: -0.60 days per decade 95% interval -1.36 to +0.16
Longest dry spell: -0.93 days per decade 95% interval -1.98 to +0.13

Last Updated August 20, 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	+1.2°C	+0.8 to +1.7°C	25
2041-2060	+1.9°C	+1.3 to +2.6°C	25
2061-2075	+2.3°C	+1.7 to +3.6°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 Aug 30, 2026 at 00:00 UTC · retrieved Aug 30, 2026 at 08:22 UTC

Scroll horizontally to see all forecast dates.

Date	SunAug 30	MonAug 31	TueSep 1	WedSep 2	ThuSep 3	FriSep 4	SatSep 5	SunSep 6	MonSep 7	TueSep 8
High	32°C	32°C	31°C	32°C	33°C	35°C	33°C	33°C	33°C	30°C
Low	19°C	20°C	20°C	20°C	20°C	21°C	22°C	22°C	22°C	22°C
Rain	0.0 mm	0.3 mm	0.0 mm	0.0 mm	0.0 mm	0.0 mm	0.0 mm	0.0 mm	0.1 mm	1.8 mm

Across the typical year: Late July has the warmest median afternoon high (29.4°C); Late December has the coolest (6.6°C). Wet days are most frequent in Early May (58%) and least frequent in Late January (26%). 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.

Piedmont 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	6.7°C (4.2–9.0°C)	-0.0°C (-1.8–1.9°C)	27%	20.4 mm (3.3–58.6 mm)
Jan 16–31	6.9°C (4.5–9.2°C)	-0.4°C (-2.3–1.2°C)	26%	23.1 mm (12.3–34.7 mm)
Feb 1–15	8.7°C (5.8–11.4°C)	0.4°C (-1.5–2.6°C)	26%	24.2 mm (3.0–40.8 mm)
Feb 16–29	10.1°C (7.3–12.7°C)	1.5°C (-0.4–3.6°C)	30%	25.2 mm (5.5–45.9 mm)
Mar 1–15	12.8°C (9.6–16.0°C)	3.3°C (1.2–5.7°C)	28%	29.2 mm (14.2–58.9 mm)
Mar 16–31	15.1°C (12.5–18.0°C)	5.9°C (3.7–7.9°C)	32%	40.3 mm (12.3–56.3 mm)
Apr 1–15	17.0°C (13.5–19.2°C)	7.6°C (5.8–9.1°C)	42%	37.9 mm (19.9–67.9 mm)
Apr 16–30	18.1°C (15.5–21.1°C)	9.6°C (7.8–11.3°C)	48%	56.8 mm (27.7–86.3 mm)
May 1–15	20.8°C (17.7–22.8°C)	12.0°C (10.3–13.4°C)	58%	61.8 mm (29.6–89.2 mm)
May 16–31	22.8°C (20.4–25.1°C)	13.9°C (12.0–15.2°C)	46%	48.2 mm (22.0–74.3 mm)
Jun 1–15	24.5°C (22.1–26.8°C)	15.6°C (14.0–17.3°C)	54%	58.8 mm (40.4–88.6 mm)
Jun 16–30	27.2°C (24.9–29.6°C)	17.5°C (15.8–19.6°C)	39%	31.3 mm (16.9–45.8 mm)
Jul 1–15	28.3°C (26.2–30.2°C)	18.7°C (16.9–20.1°C)	46%	37.0 mm (26.5–55.4 mm)
Jul 16–31	29.4°C (27.6–31.0°C)	19.4°C (17.9–20.7°C)	35%	26.3 mm (16.7–37.4 mm)
Aug 1–15	28.9°C (27.1–30.6°C)	19.1°C (17.6–20.5°C)	44%	41.3 mm (28.3–56.3 mm)
Aug 16–31	27.9°C (25.8–30.0°C)	18.4°C (16.8–20.0°C)	39%	39.1 mm (21.8–60.7 mm)
Sep 1–15	25.1°C (22.8–27.1°C)	15.6°C (14.0–17.4°C)	38%	38.1 mm (29.4–74.0 mm)
Sep 16–30	22.1°C (19.6–24.0°C)	13.7°C (11.7–15.3°C)	40%	43.8 mm (29.3–94.4 mm)
Oct 1–15	19.2°C (16.5–21.2°C)	11.6°C (9.8–13.6°C)	45%	60.5 mm (27.7–94.3 mm)
Oct 16–31	15.8°C (13.7–18.1°C)	8.8°C (6.7–10.9°C)	35%	46.8 mm (26.4–71.7 mm)
Nov 1–15	13.1°C (11.0–14.9°C)	6.7°C (4.5–8.9°C)	43%	79.3 mm (27.8–105.9 mm)
Nov 16–30	9.8°C (8.0–11.6°C)	3.2°C (0.4–6.1°C)	34%	42.1 mm (9.2–90.2 mm)
Dec 1–15	8.1°C (6.1–9.9°C)	0.8°C (-0.9–3.1°C)	29%	24.0 mm (7.4–52.5 mm)
Dec 16–31	6.6°C (4.4–8.8°C)	-0.2°C (-1.9–1.9°C)	28%	29.6 mm (8.9–55.4 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 August 20, 2026

Season to date

Growing season heat and rainfall

Apr 1–Aug 30, 2026

Growing degree days1738.3base 10°C

Growing-season rainfall250.8 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
2026-04-01	0.0	1.9	0.1 mm	2.3 mm
2026-04-02	0.3	4.0	0.1 mm	5.1 mm
2026-04-03	3.4	6.2	0.1 mm	8.2 mm
2026-04-04	8.1	8.2	0.1 mm	13.2 mm
2026-04-05	14.0	10.1	0.3 mm	16.7 mm
2026-04-06	20.9	12.9	0.3 mm	17.5 mm
2026-04-07	27.1	15.3	0.3 mm	20.2 mm
2026-04-08	34.2	17.8	0.3 mm	22.0 mm
2026-04-09	40.5	20.1	0.4 mm	24.8 mm
2026-04-10	46.6	22.4	0.4 mm	28.6 mm
2026-04-11	51.9	24.5	0.6 mm	33.4 mm
2026-04-12	55.4	27.2	2.5 mm	36.7 mm
2026-04-13	57.2	29.9	25.7 mm	39.0 mm
2026-04-14	61.1	32.5	31.4 mm	41.3 mm
2026-04-15	66.8	35.0	32.3 mm	44.7 mm
2026-04-16	73.4	37.4	32.4 mm	49.6 mm
2026-04-17	81.0	40.0	32.7 mm	53.0 mm
2026-04-18	89.7	43.0	33.1 mm	56.0 mm
2026-04-19	98.0	45.8	38.0 mm	60.5 mm
2026-04-20	103.9	48.8	39.8 mm	64.9 mm
2026-04-21	109.2	52.3	49.6 mm	68.3 mm
2026-04-22	112.0	56.7	54.9 mm	69.9 mm
2026-04-23	116.3	60.9	54.9 mm	73.4 mm
2026-04-24	122.1	65.6	54.9 mm	76.9 mm
2026-04-25	128.5	70.2	54.9 mm	81.1 mm
2026-04-26	135.9	75.0	54.9 mm	85.5 mm
2026-04-27	144.1	79.6	55.0 mm	93.8 mm
2026-04-28	151.1	83.8	56.7 mm	99.2 mm
2026-04-29	158.2	88.3	58.0 mm	104.3 mm
2026-04-30	162.5	92.7	60.3 mm	109.7 mm
2026-05-01	166.9	97.6	60.3 mm	114.6 mm
2026-05-02	172.8	102.7	60.3 mm	121.3 mm
2026-05-03	178.7	108.2	60.3 mm	127.0 mm
2026-05-04	184.6	113.5	61.2 mm	135.3 mm
2026-05-05	187.3	118.8	72.0 mm	139.9 mm
2026-05-06	192.7	124.3	84.5 mm	143.4 mm
2026-05-07	198.1	130.2	85.2 mm	144.8 mm
2026-05-08	203.2	136.8	86.6 mm	147.8 mm
2026-05-09	209.6	143.3	86.7 mm	151.3 mm
2026-05-10	214.0	149.7	92.6 mm	155.7 mm
2026-05-11	220.7	156.3	96.5 mm	162.3 mm
2026-05-12	226.2	163.1	96.9 mm	166.4 mm
2026-05-13	230.3	170.0	97.4 mm	169.3 mm
2026-05-14	233.8	177.1	101.1 mm	172.3 mm
2026-05-15	233.8	183.7	107.3 mm	176.9 mm
2026-05-16	236.5	190.5	107.4 mm	180.5 mm
2026-05-17	240.7	197.6	107.5 mm	184.7 mm
2026-05-18	245.5	204.8	109.4 mm	190.5 mm
2026-05-19	250.1	211.9	109.8 mm	195.1 mm
2026-05-20	258.2	219.0	110.2 mm	199.3 mm
2026-05-21	268.5	226.0	110.2 mm	203.2 mm
2026-05-22	279.8	233.9	110.2 mm	205.5 mm
2026-05-23	292.2	242.5	110.2 mm	208.7 mm
2026-05-24	306.0	251.3	110.3 mm	210.1 mm
2026-05-25	320.8	260.5	110.3 mm	211.8 mm
2026-05-26	336.0	269.6	110.3 mm	214.4 mm
2026-05-27	351.7	278.7	110.3 mm	218.8 mm
2026-05-28	367.4	287.8	111.8 mm	223.0 mm
2026-05-29	381.1	296.9	116.7 mm	226.9 mm
2026-05-30	395.0	306.1	116.7 mm	229.7 mm
2026-05-31	408.8	315.0	117.5 mm	234.0 mm
2026-06-01	421.7	324.1	119.1 mm	239.0 mm
2026-06-02	431.5	333.6	134.0 mm	241.9 mm
2026-06-03	442.1	343.3	134.2 mm	244.8 mm
2026-06-04	451.2	353.2	141.8 mm	249.0 mm
2026-06-05	460.5	363.0	144.2 mm	255.1 mm
2026-06-06	470.5	372.6	148.6 mm	259.1 mm
2026-06-07	482.0	382.3	149.0 mm	264.9 mm
2026-06-08	495.2	392.4	149.0 mm	267.8 mm
2026-06-09	507.3	402.8	151.8 mm	272.3 mm
2026-06-10	518.3	413.2	158.4 mm	277.4 mm
2026-06-11	528.5	423.6	158.4 mm	282.9 mm
2026-06-12	539.1	434.2	158.4 mm	286.3 mm
2026-06-13	552.9	444.8	158.4 mm	290.6 mm
2026-06-14	565.8	455.2	158.5 mm	295.3 mm
2026-06-15	579.0	466.1	158.9 mm	299.2 mm
2026-06-16	592.9	477.4	158.9 mm	303.2 mm
2026-06-17	608.5	488.5	159.0 mm	306.7 mm
2026-06-18	624.9	500.3	159.1 mm	307.9 mm
2026-06-19	642.0	512.1	159.7 mm	312.0 mm
2026-06-20	659.7	524.0	160.1 mm	314.6 mm
2026-06-21	677.9	536.2	160.6 mm	316.1 mm
2026-06-22	696.8	548.7	161.0 mm	318.0 mm
2026-06-23	715.6	561.0	161.2 mm	320.7 mm
2026-06-24	733.7	573.5	164.1 mm	322.3 mm
2026-06-25	751.4	586.1	166.7 mm	324.4 mm
2026-06-26	769.9	598.8	168.1 mm	326.7 mm
2026-06-27	789.4	611.8	168.6 mm	330.2 mm
2026-06-28	810.2	624.6	169.1 mm	332.8 mm
2026-06-29	829.1	637.5	170.3 mm	336.0 mm
2026-06-30	845.8	650.7	171.6 mm	337.1 mm
2026-07-01	860.6	664.0	178.2 mm	339.2 mm
2026-07-02	874.2	677.2	178.2 mm	342.2 mm
2026-07-03	889.3	690.6	178.2 mm	344.2 mm
2026-07-04	905.5	703.8	178.2 mm	346.5 mm
2026-07-05	922.2	717.2	178.2 mm	348.7 mm
2026-07-06	938.6	730.5	178.4 mm	351.5 mm
2026-07-07	955.0	743.7	178.4 mm	355.5 mm
2026-07-08	973.3	756.9	178.4 mm	357.6 mm
2026-07-09	991.1	769.8	178.4 mm	359.2 mm
2026-07-10	1008.3	782.8	180.3 mm	362.4 mm
2026-07-11	1025.1	795.9	183.5 mm	366.0 mm
2026-07-12	1041.1	809.2	183.5 mm	368.4 mm
2026-07-13	1057.5	822.5	183.6 mm	371.2 mm
2026-07-14	1075.3	835.8	184.1 mm	373.7 mm
2026-07-15	1092.0	849.1	184.6 mm	377.9 mm
2026-07-16	1107.3	862.7	185.5 mm	379.7 mm
2026-07-17	1123.5	876.4	189.1 mm	382.5 mm
2026-07-18	1140.9	890.1	190.9 mm	384.5 mm
2026-07-19	1157.4	904.1	191.9 mm	386.2 mm
2026-07-20	1173.2	918.3	192.5 mm	387.7 mm
2026-07-21	1188.6	932.4	196.7 mm	389.6 mm
2026-07-22	1202.8	946.8	196.8 mm	391.1 mm
2026-07-23	1216.8	961.1	197.1 mm	393.2 mm
2026-07-24	1231.1	975.1	197.1 mm	396.5 mm
2026-07-25	1244.6	989.6	197.4 mm	397.8 mm
2026-07-26	1258.7	1004.2	200.1 mm	398.8 mm
2026-07-27	1274.5	1018.7	200.1 mm	400.4 mm
2026-07-28	1290.9	1033.3	200.1 mm	402.9 mm
2026-07-29	1309.5	1047.7	200.1 mm	405.8 mm
2026-07-30	1329.0	1062.4	200.1 mm	406.6 mm
2026-07-31	1347.9	1076.7	200.9 mm	408.7 mm
2026-08-01	1366.3	1091.2	201.6 mm	410.6 mm
2026-08-02	1384.3	1105.7	204.8 mm	412.6 mm
2026-08-03	1403.2	1120.1	206.2 mm	415.3 mm
2026-08-04	1421.7	1134.6	207.5 mm	419.1 mm
2026-08-05	1440.5	1149.0	208.0 mm	422.7 mm
2026-08-06	1460.0	1163.6	208.5 mm	425.5 mm
2026-08-07	1477.8	1178.1	210.0 mm	427.4 mm
2026-08-08	1494.7	1192.2	210.3 mm	432.1 mm
2026-08-09	1512.2	1205.9	211.7 mm	435.3 mm
2026-08-10	1529.2	1219.5	211.7 mm	440.2 mm
2026-08-11	1547.2	1232.9	212.5 mm	442.7 mm
2026-08-12	1565.5	1246.0	212.9 mm	446.4 mm
2026-08-13	1584.9	1259.3	213.2 mm	448.6 mm
2026-08-14	1603.8	1272.5	213.6 mm	452.5 mm
2026-08-15	1621.6	1285.6	213.8 mm	455.4 mm
2026-08-16	1639.5	1298.7	216.0 mm	458.0 mm
2026-08-17	1654.7	1312.0	216.2 mm	460.3 mm
2026-08-18	1671.3	1325.7	216.2 mm	462.1 mm
2026-08-19	1688.1	1339.5	218.7 mm	464.3 mm
2026-08-20	1702.5	1353.1	228.8 mm	468.1 mm
2026-08-21	1713.5	1366.5	249.8 mm	470.5 mm
2026-08-22	1725.7	1380.0	249.9 mm	472.0 mm
2026-08-23	1738.3	1393.4	250.8 mm	474.1 mm

Forecast outlook

ECMWF IFS 0.25° via Herbie · run Aug 30, 2026 at 00:00 UTC

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

GDD accumulation: 158 GDDvs 107 GDD average
Total rainfall: 2.3 mmvs 32.9 mm average

The forecast includes a period of potentially stressful heat. The region's 34°C heat threshold is reached Sep 4.

Sun8/30 32°Cavg 26°C 19°Cavg 17°C +15 GDD 0.0 mm

Mon8/31 32°Cavg 26°C 20°Cavg 16°C +15 GDD 0.3 mm

Tue9/1 31°Cavg 25°C 20°Cavg 16°C +15 GDD 0.0 mm

Wed9/2 32°Cavg 25°C 20°Cavg 16°C +15 GDD 0.0 mm

Thu9/3 33°Cavg 25°C 20°Cavg 16°C +16 GDD 0.0 mm

Fri9/4 35°Cavg 25°C 21°Cavg 16°C +17 GDD 0.0 mm

Sat9/5 33°Cavg 26°C 22°Cavg 16°C +16 GDD 0.0 mm

Sun9/6 33°Cavg 25°C 22°Cavg 15°C +16 GDD 0.0 mm

Mon9/7 33°Cavg 25°C 22°Cavg 16°C +16 GDD 0.1 mm

Tue9/8 30°Cavg 25°C 22°Cavg 16°C +15 GDD 1.8 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 August 23, 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.

Region outline: Istituto nazionale di statistica (Istat), 2026; reprojected and simplified by Weather & Vines; CC BY 4.0. This is a statistical administrative boundary, not a wine-denomination boundary.

The Piedmont model uses a April 1–October 31 growing season, base 10°C GDD, and an operational hot-day marker of 34°C.

The historical series uses 3 ERA5 locations, 1 temperature station, and 2 rain stations. Interpretation confidence: moderate. Geometry confidence: authoritative. Rules: piedmont-v4-2026-08.