Chile · Multi-region weather view
Maipo Valley
Sign in to followVineyards along the Maipo from the Andean foothills through the central valley to the drier western reaches around Isla de Maipo.
Warm, dry summers dominate, while elevation cools foothill nights and marine influence grows westward. Spring frost, heat spikes and late-season rain can differ substantially across that transect.
Climate comparisons use the 1991–2020 combined regional record · updated through Sep 13, 2026.
Current conditions
Observations through Sep 21, 2026 · 03:00 UTC
Temperature10.5°C
Dew Point9.1°C
Relative Humidity91%
24h Rainfall17.1 mmmodeled IFS total through Sep 20
Vintage explorer
Mean temperature10.7°C
Temperature anomaly-5.8°Cvs 1991-2020
Growing degree days12base 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. Frost exposure can vary sharply from one site to the next.
Cooler growing season · High confidence
Mean growing-season temperature was -5.8°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 209 mm below the 1991–2020 baseline.
Less rain often lowers disease pressure, but vines may depend more on stored soil water or irrigation.
Spring frost recorded · Low confidence
The regional record had 1 spring day(s) at or below 0°C.
Frost exposure can vary sharply from one site to the next.
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 | -0.4°C | +195 mm | 0 |
| 1992 | +0.4°C | +8 mm | 0 |
| 1993 | -0.1°C | -38 mm | 0 |
| 1994 | +0.7°C | -42 mm | 0 |
| 1995 | -0.1°C | -45 mm | 0 |
| 1996 | +1.1°C | -79 mm | 0 |
| 1997 | -0.2°C | +242 mm | 0 |
| 1998 | +0.1°C | -93 mm | 0 |
| 1999 | -0.2°C | +93 mm | 0 |
| 2000 | -0.3°C | +100 mm | 0 |
| 2001 | -0.1°C | -63 mm | 0 |
| 2002 | -0.4°C | -47 mm | 0 |
| 2003 | -0.1°C | +20 mm | 0 |
| 2004 | -0.5°C | +43 mm | 0 |
| 2005 | -0.6°C | -15 mm | 0 |
| 2006 | -0.5°C | +18 mm | 0 |
| 2007 | -0.4°C | -71 mm | 0 |
| 2008 | +0.3°C | -130 mm | 0 |
| 2009 | -0.5°C | -6 mm | 0 |
| 2010 | -0.8°C | +18 mm | 0 |
| 2011 | +0.4°C | -92 mm | 0 |
| 2012 | -0.4°C | +9 mm | 0 |
| 2013 | -0.4°C | -98 mm | 0 |
| 2014 | +0.5°C | -26 mm | 0 |
| 2015 | -0.1°C | +338 mm | 0 |
| 2016 | +0.9°C | +19 mm | 0 |
| 2017 | -0.1°C | -32 mm | 0 |
| 2018 | +0.3°C | -28 mm | 0 |
| 2019 | +1.2°C | -111 mm | 0 |
| 2020 | -0.0°C | -87 mm | 0 |
| 2021 | -0.1°C | -56 mm | 0 |
| 2022 | +0.7°C | -77 mm | 0 |
| 2023 | -0.0°C | +36 mm | 0 |
| 2024 | +0.5°C | -108 mm | 0 |
| 2025 | +0.4°C | -56 mm | 0 |
| 2026 | -5.8°C | -209 mm | 0 |
winter
9.2°C
+1.5°C vs baseline
430 mm rain · +109 mm
spring
10.7°C
-2.7°C vs baseline
6 mm rain · -129 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 +22.6 GDD per decade. The 95% interval is -14.1 to +59.4 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 | 1518 GDD | -77 GDD |
| 1992 | 1683 GDD | +88 GDD |
| 1993 | 1596 GDD | +0 GDD |
| 1994 | 1747 GDD | +151 GDD |
| 1995 | 1557 GDD | -38 GDD |
| 1996 | 1846 GDD | +251 GDD |
| 1997 | 1551 GDD | -45 GDD |
| 1998 | 1610 GDD | +15 GDD |
| 1999 | 1571 GDD | -24 GDD |
| 2000 | 1536 GDD | -60 GDD |
| 2001 | 1577 GDD | -19 GDD |
| 2002 | 1489 GDD | -107 GDD |
| 2003 | 1586 GDD | -10 GDD |
| 2004 | 1465 GDD | -131 GDD |
| 2005 | 1473 GDD | -122 GDD |
| 2006 | 1480 GDD | -115 GDD |
| 2007 | 1515 GDD | -81 GDD |
| 2008 | 1670 GDD | +74 GDD |
| 2009 | 1500 GDD | -95 GDD |
| 2010 | 1409 GDD | -187 GDD |
| 2011 | 1701 GDD | +105 GDD |
| 2012 | 1488 GDD | -107 GDD |
| 2013 | 1520 GDD | -75 GDD |
| 2014 | 1709 GDD | +113 GDD |
| 2015 | 1573 GDD | -22 GDD |
| 2016 | 1794 GDD | +198 GDD |
| 2017 | 1576 GDD | -20 GDD |
| 2018 | 1655 GDD | +60 GDD |
| 2019 | 1896 GDD | +301 GDD |
| 2020 | 1577 GDD | -19 GDD |
| 2021 | 1574 GDD | -21 GDD |
| 2022 | 1759 GDD | +163 GDD |
| 2023 | 1580 GDD | -16 GDD |
| 2024 | 1701 GDD | +105 GDD |
| 2025 | 1691 GDD | +96 GDD |
- Growing-season mean temperature
- +0.11 °C per decade 95% interval -0.06 to +0.27
- Growing degree days
- +22.62 GDD per decade 95% interval -14.11 to +59.35
- Growing-season precipitation
- -24.35 mm per decade 95% interval -50.70 to +2.00
- Hot days
- No variation recorded
- Spring frost days
- -0.28 days per decade 95% interval -0.78 to +0.22
- Longest dry spell
- +9.81 days per decade 95% interval +2.10 to +17.51
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 | +0.8°C | +0.5 to +1.0°C | 25 |
| 2041-2060 | +1.3°C | +0.9 to +1.8°C | 25 |
| 2061-2075 | +1.7°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 | 18°C | 21°C | 18°C | 16°C | 20°C | 22°C | 20°C | 17°C | 15°C |
| Low | 7°C | 8°C | 10°C | 10°C | 11°C | 11°C | 13°C | 11°C | 8°C |
| Rain | 0.0 mm | 0.0 mm | 0.0 mm | 0.0 mm | 2.9 mm | 0.1 mm | 1.8 mm | 4.1 mm | 0.2 mm |
Across the typical year: Early January has the warmest median afternoon high (27.2°C); Early July has the coolest (12.4°C). Wet days are most frequent in Late May (31%) and least frequent in Late January (6%). 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 | 27.2°C (25.8–28.6°C) | 14.0°C (13.0–14.9°C) | 6% | 2.4 mm (1.4–5.1 mm) |
| Jan 16–31 | 27.2°C (25.7–28.8°C) | 14.2°C (13.2–15.2°C) | 6% | 2.8 mm (1.5–4.9 mm) |
| Feb 1–15 | 26.7°C (25.6–28.2°C) | 13.8°C (12.9–14.7°C) | 6% | 3.0 mm (1.3–5.8 mm) |
| Feb 16–29 | 26.0°C (24.7–27.6°C) | 13.3°C (12.4–14.3°C) | 8% | 2.4 mm (1.0–5.3 mm) |
| Mar 1–15 | 26.0°C (24.0–27.6°C) | 12.6°C (11.3–13.5°C) | 7% | 1.6 mm (0.8–7.3 mm) |
| Mar 16–31 | 24.5°C (22.8–26.0°C) | 11.1°C (10.0–12.2°C) | 7% | 2.5 mm (0.5–6.6 mm) |
| Apr 1–15 | 22.0°C (19.7–24.2°C) | 9.1°C (7.5–10.4°C) | 15% | 9.2 mm (3.1–18.7 mm) |
| Apr 16–30 | 19.8°C (17.6–22.3°C) | 6.9°C (5.1–8.6°C) | 14% | 11.1 mm (4.1–26.9 mm) |
| May 1–15 | 18.3°C (16.0–20.4°C) | 5.5°C (3.4–7.5°C) | 16% | 5.5 mm (0.7–30.8 mm) |
| May 16–31 | 15.4°C (13.1–17.5°C) | 4.1°C (1.7–6.3°C) | 31% | 41.2 mm (18.5–85.2 mm) |
| Jun 1–15 | 13.6°C (11.8–16.2°C) | 2.4°C (0.3–4.8°C) | 29% | 50.3 mm (23.1–86.6 mm) |
| Jun 16–30 | 12.5°C (10.3–15.0°C) | 1.8°C (-0.5–4.2°C) | 31% | 47.3 mm (11.5–102.2 mm) |
| Jul 1–15 | 12.4°C (10.3–14.5°C) | 1.6°C (-0.9–3.7°C) | 28% | 46.2 mm (24.9–68.4 mm) |
| Jul 16–31 | 12.7°C (10.4–14.8°C) | 1.1°C (-1.3–3.3°C) | 27% | 28.9 mm (14.2–58.6 mm) |
| Aug 1–15 | 13.6°C (11.3–16.1°C) | 1.8°C (-0.4–3.8°C) | 26% | 24.5 mm (16.3–61.7 mm) |
| Aug 16–31 | 14.9°C (12.2–17.8°C) | 3.3°C (0.8–5.4°C) | 27% | 28.9 mm (11.1–60.5 mm) |
| Sep 1–15 | 15.7°C (12.9–18.8°C) | 4.2°C (2.1–6.1°C) | 31% | 25.6 mm (8.7–49.7 mm) |
| Sep 16–30 | 17.3°C (15.0–20.2°C) | 5.4°C (3.7–7.0°C) | 27% | 25.0 mm (13.5–37.0 mm) |
| Oct 1–15 | 18.3°C (15.6–21.1°C) | 6.5°C (4.7–8.1°C) | 30% | 24.8 mm (10.6–29.6 mm) |
| Oct 16–31 | 20.6°C (18.1–23.0°C) | 7.8°C (6.3–9.4°C) | 22% | 12.1 mm (6.2–23.1 mm) |
| Nov 1–15 | 22.0°C (19.5–24.5°C) | 9.3°C (8.0–10.4°C) | 22% | 9.4 mm (5.3–19.7 mm) |
| Nov 16–30 | 24.0°C (21.7–26.0°C) | 10.5°C (9.2–11.5°C) | 17% | 7.8 mm (4.9–10.6 mm) |
| Dec 1–15 | 24.8°C (23.0–26.6°C) | 11.4°C (10.1–12.4°C) | 10% | 5.9 mm (4.2–9.4 mm) |
| Dec 16–31 | 26.2°C (24.7–27.9°C) | 12.9°C (11.9–14.1°C) | 6% | 2.8 mm (2.0–5.4 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 September 12, 2026
Season to date
Growing season heat and rainfall
Sep 1–Sep 20, 2026
Growing degree days12.3base 10°C
Growing-season rainfall6.8 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 | 3.0 | 0.7 | 0.0 mm | 2.5 mm |
| 2026-09-02 | 6.8 | 1.3 | 0.1 mm | 3.8 mm |
| 2026-09-03 | 9.6 | 2.3 | 1.0 mm | 7.2 mm |
| 2026-09-04 | 10.2 | 3.2 | 1.0 mm | 9.7 mm |
| 2026-09-05 | 10.2 | 4.0 | 1.0 mm | 13.9 mm |
| 2026-09-06 | 10.9 | 4.8 | 1.0 mm | 19.4 mm |
| 2026-09-07 | 10.9 | 5.7 | 1.0 mm | 22.6 mm |
| 2026-09-08 | 10.9 | 6.7 | 1.1 mm | 23.7 mm |
| 2026-09-09 | 11.2 | 7.8 | 1.7 mm | 26.3 mm |
| 2026-09-10 | 11.2 | 8.8 | 3.8 mm | 29.9 mm |
| 2026-09-11 | 11.2 | 9.7 | 6.4 mm | 31.0 mm |
| 2026-09-12 | 11.3 | 10.6 | 6.8 mm | 33.4 mm |
| 2026-09-13 | 12.3 | 11.6 | 6.8 mm | 34.8 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
- 30 GDDvs 17 GDD average
- Total rainfall
- 9.0 mmvs 13.5 mm average
No unusually hot or wet period stands out in the short-range forecast.
Mon9/21
18°Cavg 18°C
7°Cavg 5°C
+2 GDD
0.0 mm
Tue9/22
21°Cavg 17°C
8°Cavg 6°C
+4 GDD
0.0 mm
Wed9/23
18°Cavg 18°C
10°Cavg 5°C
+4 GDD
0.0 mm
Thu9/24
16°Cavg 19°C
10°Cavg 5°C
+3 GDD
0.0 mm
Fri9/25
20°Cavg 18°C
11°Cavg 5°C
+4 GDD
2.9 mm
Sat9/26
22°Cavg 17°C
11°Cavg 6°C
+5 GDD
0.1 mm
Sun9/27
20°Cavg 17°C
13°Cavg 6°C
+5 GDD
1.8 mm
Mon9/28
17°Cavg 18°C
11°Cavg 6°C
+3 GDD
4.1 mm
Tue9/29
15°Cavg 18°C
8°Cavg 6°C
+0 GDD
0.2 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 Maipo Valley model uses a September 1–April 30 growing season, base 10°C GDD, and an operational hot-day marker of 35°C.