Argentina · Multi-region weather view
Mendoza
Sign in to followMendoza's principal wine areas, from Luján de Cuyo and Maipú south through the Uco Valley and east toward San Martín and Santa Rosa.
The Andes rain shadow makes the season dry, but elevation separates cooler Uco Valley sites from the warmer eastern plain. Spring frost, hail, summer heat and the timing of scarce rain are the main weather signals.
Climate comparisons use the 1991–2020 combined regional record · updated through Sep 13, 2026.
Current conditions
Observations through Sep 21, 2026 · 03:00 UTC
Temperature15.4°C
Dew Point-4.6°C
Relative Humidity25%
24h Rainfall1.0 mmmodeled IFS total through Sep 20
Vintage explorer
Mean temperature6.6°C
Temperature anomaly-9.7°Cvs 1991-2020
Growing degree days4base 10°C
Hot days0≥ 35°C
What stood out in 2026
Cool weather can slow ripening and help grapes retain acidity. Less rain often lowers disease pressure, but vines may depend more on stored soil water or irrigation. A freeze after budbreak can damage new growth and reduce the crop.
Cooler growing season · High confidence
Mean growing-season temperature was -9.7°C versus the 1991–2020 baseline.
Cool weather can slow ripening and help grapes retain acidity.
Drier than baseline · Moderate confidence
Growing-season precipitation was 672 mm below the 1991–2020 baseline.
Less rain often lowers disease pressure, but vines may depend more on stored soil water or irrigation.
Spring freeze recorded · Moderate confidence
The regional record had 3 spring day(s) at or below -2°C.
A freeze after budbreak can damage new growth and reduce the crop.
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.
View historical chart data as a table
| Year | Temperature anomaly | Rainfall anomaly | Hot days |
|---|---|---|---|
| 1991 | -0.6°C | +274 mm | 0 |
| 1992 | -0.6°C | +245 mm | 0 |
| 1993 | -0.6°C | +17 mm | 0 |
| 1994 | +0.3°C | +2 mm | 0 |
| 1995 | -0.2°C | +9 mm | 0 |
| 1996 | +0.2°C | +72 mm | 0 |
| 1997 | -1.1°C | +391 mm | 0 |
| 1998 | -0.6°C | +73 mm | 0 |
| 1999 | -0.8°C | +328 mm | 0 |
| 2000 | -0.4°C | +23 mm | 0 |
| 2001 | -0.8°C | +154 mm | 0 |
| 2002 | +0.2°C | -41 mm | 1 |
| 2003 | +0.8°C | -148 mm | 0 |
| 2004 | -0.7°C | +21 mm | 0 |
| 2005 | +0.0°C | -181 mm | 1 |
| 2006 | +0.1°C | +3 mm | 0 |
| 2007 | +0.1°C | -107 mm | 0 |
| 2008 | +0.9°C | -201 mm | 0 |
| 2009 | +0.2°C | -181 mm | 0 |
| 2010 | -0.2°C | -123 mm | 0 |
| 2011 | +0.9°C | -216 mm | 0 |
| 2012 | +0.3°C | -93 mm | 0 |
| 2013 | -0.1°C | -99 mm | 0 |
| 2014 | +0.8°C | +20 mm | 0 |
| 2015 | -1.2°C | +432 mm | 0 |
| 2016 | +0.7°C | -49 mm | 0 |
| 2017 | +0.7°C | -202 mm | 0 |
| 2018 | +0.3°C | -99 mm | 0 |
| 2019 | +1.2°C | -180 mm | 0 |
| 2020 | +0.4°C | -143 mm | 0 |
| 2021 | +0.4°C | -178 mm | 0 |
| 2022 | +1.1°C | -247 mm | 0 |
| 2023 | +1.1°C | -60 mm | 1 |
| 2024 | +1.5°C | -209 mm | 2 |
| 2025 | +0.6°C | -34 mm | 0 |
| 2026 | -9.7°C | -672 mm | 0 |
winter
7.0°C
+1.3°C vs baseline
162 mm rain · +42 mm
spring
6.6°C
-6.9°C vs baseline
25 mm rain · -184 mm
summer
Incomplete seasonal record
Temperature and rainfall are withheld for this window.
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.
Observed record
Historical trends, 1991–2025
Growing degree days changed +95.3 GDD per decade. The 95% interval is +66.6 to +124.0 GDD per decade, based on 35 eligible vintages.
Weighted median: 70% SSP2-4.5 · 15% SSP1-2.6 · 15% SSP3-7.0
Shaded central 80% model range using the same weights.
How it is measured: Across the September 1–April 30 growing season, each day's mean temperature above 10°C adds to the total; cooler days add zero.
Scroll horizontally to inspect the full timeline.
View annual growing degree days data
| Vintage | Growing degree days | Change from 1991–2020 |
|---|---|---|
| 1991 | 1459 GDD | -140 GDD |
| 1992 | 1473 GDD | -126 GDD |
| 1993 | 1492 GDD | -108 GDD |
| 1994 | 1632 GDD | +33 GDD |
| 1995 | 1543 GDD | -56 GDD |
| 1996 | 1637 GDD | +37 GDD |
| 1997 | 1326 GDD | -273 GDD |
| 1998 | 1487 GDD | -112 GDD |
| 1999 | 1391 GDD | -209 GDD |
| 2000 | 1562 GDD | -37 GDD |
| 2001 | 1415 GDD | -184 GDD |
| 2002 | 1622 GDD | +23 GDD |
| 2003 | 1779 GDD | +180 GDD |
| 2004 | 1447 GDD | -152 GDD |
| 2005 | 1660 GDD | +60 GDD |
| 2006 | 1590 GDD | -9 GDD |
| 2007 | 1612 GDD | +13 GDD |
| 2008 | 1807 GDD | +208 GDD |
| 2009 | 1680 GDD | +81 GDD |
| 2010 | 1522 GDD | -77 GDD |
| 2011 | 1812 GDD | +213 GDD |
| 2012 | 1634 GDD | +35 GDD |
| 2013 | 1630 GDD | +31 GDD |
| 2014 | 1750 GDD | +151 GDD |
| 2015 | 1363 GDD | -236 GDD |
| 2016 | 1749 GDD | +150 GDD |
| 2017 | 1741 GDD | +142 GDD |
| 2018 | 1605 GDD | +6 GDD |
| 2019 | 1899 GDD | +300 GDD |
| 2020 | 1657 GDD | +58 GDD |
| 2021 | 1653 GDD | +53 GDD |
| 2022 | 1835 GDD | +236 GDD |
| 2023 | 1837 GDD | +238 GDD |
| 2024 | 1902 GDD | +303 GDD |
| 2025 | 1726 GDD | +127 GDD |
- Growing-season mean temperature
- +0.44 °C per decade 95% interval +0.31 to +0.58
- Growing degree days
- +95.31 GDD per decade 95% interval +66.57 to +124.05
- Growing-season precipitation
- -94.74 mm per decade 95% interval -137.51 to -51.97
- Hot days
- +0.11 days per decade 95% interval -0.07 to +0.28
- Spring frost days
- -0.50 days per decade 95% interval -1.03 to +0.03
- Longest dry spell
- +1.10 days per decade 95% interval -0.15 to +2.36
Last Updated September 13, 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 | +0.7°C | +0.5 to +1.1°C | 25 |
| 2041-2060 | +1.3°C | +0.9 to +1.8°C | 25 |
| 2061-2075 | +1.6°C | +1.2 to +2.4°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
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
Scroll horizontally to see all forecast dates.
| Date | Mon | Tue | Wed | Thu | Fri | Sat | Sun | Mon | Tue |
|---|---|---|---|---|---|---|---|---|---|
| High | 17°C | 18°C | 25°C | 28°C | 25°C | 30°C | 24°C | 15°C | 12°C |
| Low | 11°C | 5°C | 8°C | 14°C | 15°C | 13°C | 17°C | 11°C | 8°C |
| Rain | 0.0 mm | 0.0 mm | 0.0 mm | 0.2 mm | 0.0 mm | 0.0 mm | 0.0 mm | 0.2 mm | 6.2 mm |
Across the typical year: Late December has the warmest median afternoon high (27.3°C); Early July has the coolest (10.4°C). Wet days are most frequent in Late January (72%) and least frequent in Early June (26%). Ties are resolved by calendar order.
Afternoon highOvernight lowMiddle 50%
Scroll horizontally to inspect all 24 half-month periods.
Scroll horizontally to inspect all 24 half-month periods.
View all 24 periods as a table
Scroll horizontally to view all columns.
| Period | Afternoon high, median (middle 50%) | Overnight low, median (middle 50%) | Wet-day frequency | Period rain, median (middle 50%) |
|---|---|---|---|---|
| Jan 1–15 | 26.9°C (24.8–29.1°C) | 15.3°C (13.6–16.7°C) | 71% | 45.7 mm (32.8–66.9 mm) |
| Jan 16–31 | 26.8°C (24.6–28.9°C) | 15.1°C (13.6–16.6°C) | 72% | 60.0 mm (42.3–73.6 mm) |
| Feb 1–15 | 26.0°C (23.3–27.7°C) | 14.4°C (12.9–15.9°C) | 72% | 53.0 mm (32.0–75.9 mm) |
| Feb 16–29 | 25.5°C (22.5–27.9°C) | 13.7°C (11.7–15.5°C) | 66% | 42.8 mm (19.3–56.7 mm) |
| Mar 1–15 | 23.8°C (21.5–26.5°C) | 13.1°C (11.3–14.5°C) | 64% | 52.8 mm (39.7–71.8 mm) |
| Mar 16–31 | 22.2°C (18.9–24.5°C) | 10.7°C (9.0–12.8°C) | 55% | 48.7 mm (23.5–61.8 mm) |
| Apr 1–15 | 19.7°C (16.5–22.0°C) | 8.7°C (6.6–10.4°C) | 48% | 38.5 mm (20.7–58.6 mm) |
| Apr 16–30 | 17.9°C (15.0–20.3°C) | 6.6°C (4.2–8.4°C) | 34% | 24.6 mm (13.8–35.6 mm) |
| May 1–15 | 16.0°C (13.1–18.3°C) | 5.1°C (3.5–6.8°C) | 33% | 19.2 mm (9.3–34.4 mm) |
| May 16–31 | 12.9°C (10.0–15.4°C) | 2.5°C (0.7–4.5°C) | 36% | 24.8 mm (16.8–31.6 mm) |
| Jun 1–15 | 12.1°C (9.1–14.2°C) | 1.0°C (-1.1–2.7°C) | 26% | 18.1 mm (9.1–30.0 mm) |
| Jun 16–30 | 10.7°C (8.0–12.9°C) | 0.0°C (-2.1–1.8°C) | 29% | 17.5 mm (9.3–24.5 mm) |
| Jul 1–15 | 10.4°C (7.3–13.1°C) | -0.4°C (-2.6–1.3°C) | 26% | 16.2 mm (8.4–25.1 mm) |
| Jul 16–31 | 10.4°C (7.9–13.0°C) | -0.9°C (-3.1–1.2°C) | 26% | 12.7 mm (8.8–24.0 mm) |
| Aug 1–15 | 12.3°C (9.0–15.0°C) | 0.2°C (-2.0–2.2°C) | 26% | 15.9 mm (10.3–24.0 mm) |
| Aug 16–31 | 14.4°C (10.5–17.6°C) | 2.0°C (-0.3–3.9°C) | 28% | 17.4 mm (11.3–28.7 mm) |
| Sep 1–15 | 15.2°C (11.6–17.9°C) | 3.1°C (1.0–5.2°C) | 36% | 24.3 mm (16.4–32.1 mm) |
| Sep 16–30 | 17.4°C (14.1–20.5°C) | 5.0°C (2.8–7.0°C) | 31% | 20.7 mm (11.6–34.3 mm) |
| Oct 1–15 | 19.0°C (15.8–21.9°C) | 6.6°C (4.5–8.6°C) | 41% | 29.6 mm (20.3–52.9 mm) |
| Oct 16–31 | 21.2°C (17.9–23.8°C) | 8.4°C (6.6–10.2°C) | 43% | 34.2 mm (14.4–44.3 mm) |
| Nov 1–15 | 23.1°C (19.6–25.9°C) | 10.1°C (8.2–11.7°C) | 48% | 33.8 mm (18.5–51.6 mm) |
| Nov 16–30 | 24.4°C (21.7–27.0°C) | 11.1°C (9.5–13.1°C) | 54% | 44.5 mm (25.0–56.1 mm) |
| Dec 1–15 | 25.2°C (22.6–27.4°C) | 12.3°C (10.6–13.8°C) | 62% | 39.7 mm (30.4–66.3 mm) |
| Dec 16–31 | 27.3°C (24.9–29.4°C) | 14.7°C (12.7–16.2°C) | 61% | 35.4 mm (24.1–62.1 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
Sep 1–Sep 20, 2026
Growing degree days4.3base 10°C
Growing-season rainfall25.9 mmweighted regional total
2026 season1991–2020 average
2026 season1991–2020 average
View growing-season accumulation data
| Date | Season GDD | 1991–2020 average GDD | Season rainfall | 1991–2020 average rainfall |
|---|---|---|---|---|
| 2026-09-01 | 0.5 | 0.6 | 0.0 mm | 1.6 mm |
| 2026-09-02 | 4.3 | 0.9 | 0.7 mm | 2.6 mm |
| 2026-09-03 | 4.3 | 1.5 | 3.8 mm | 3.9 mm |
| 2026-09-04 | 4.3 | 2.5 | 4.3 mm | 5.3 mm |
| 2026-09-05 | 4.3 | 3.6 | 7.0 mm | 8.1 mm |
| 2026-09-06 | 4.3 | 4.6 | 7.2 mm | 10.3 mm |
| 2026-09-07 | 4.3 | 5.5 | 7.2 mm | 12.3 mm |
| 2026-09-08 | 4.3 | 6.4 | 7.2 mm | 14.5 mm |
| 2026-09-09 | 4.3 | 7.4 | 8.1 mm | 17.5 mm |
| 2026-09-10 | 4.3 | 8.7 | 8.6 mm | 19.1 mm |
| 2026-09-11 | 4.3 | 9.6 | 18.4 mm | 20.3 mm |
| 2026-09-12 | 4.3 | 10.8 | 25.9 mm | 21.8 mm |
| 2026-09-13 | 4.3 | 11.5 | 25.9 mm | 23.4 mm |
Forecast outlook
ECMWF IFS 0.25° via Herbie · run Sep 20, 2026 at 00:00 UTC
9-day totals compared with the 1991–2020 combined regional record
- GDD accumulation
- 54 GDDvs 19 GDD average
- Total rainfall
- 6.6 mmvs 16.6 mm average
No unusually hot or wet period stands out in the short-range forecast.
Mon9/21
17°Cavg 18°C
11°Cavg 5°C
+4 GDD
0.0 mm
Tue9/22
18°Cavg 17°C
5°Cavg 5°C
+1 GDD
0.0 mm
Wed9/23
25°Cavg 16°C
8°Cavg 5°C
+6 GDD
0.0 mm
Thu9/24
28°Cavg 17°C
14°Cavg 4°C
+10 GDD
0.2 mm
Fri9/25
25°Cavg 18°C
15°Cavg 5°C
+10 GDD
0.0 mm
Sat9/26
30°Cavg 17°C
13°Cavg 5°C
+10 GDD
0.0 mm
Sun9/27
24°Cavg 17°C
17°Cavg 5°C
+10 GDD
0.0 mm
Mon9/28
15°Cavg 17°C
11°Cavg 5°C
+3 GDD
0.2 mm
Tue9/29
12°Cavg 18°C
8°Cavg 6°C
+0 GDD
6.2 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 Mendoza model uses a September 1–April 30 growing season, base 10°C GDD, and an operational hot-day marker of 35°C.