Climate averages 1991–2020
Mendoza weather
in September.
A mild, fairly dry month: the 8th warmest and the 4th driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Mendoza: daytime highs average 18.3°C and nights cool to about 6.1°C. By daytime temperature it is the 8th warmest of the 12 months.
Expect about 28 mm of rain on roughly 5 days, which makes September a fairly dry month (the 4th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 52 min on an average September day.
The nearest other city in this atlas is San Martín (41 km away). In September its highs average 21.1°C, 2.8°C warmer than Mendoza, with 11 mm of rain.
Among the 67 cities listed in Argentina, Mendoza ranks joint 43rd of 67 for the warmest September highs and joint 11th of 67 for the driest September (rainfall, lowest first). The mean September high of those 67 cities is 19.4°C; Mendoza is 1.1°C cooler than that mean.
From September to October, average highs rise by 3.6°C to 21.9°C, and monthly rainfall rises from 28 mm to 43 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Mendoza climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 28.4°C17.8°C | 17.8°C | 48 | 7.8 | 14.014 h |
| February | 26.9°C16.6°C | 16.6°C | 48 | 7.2 | 13.313 h |
| March | 23.9°C14.4°C | 14.4°C | 59 | 7.8 | 12.312 h |
| April | 19.4°C10.2°C | 10.2°C | 40 | 6.5 | 11.311 h |
| May | 15.5°C6.4°C | 6.4°C | 30 | 6.1 | 10.510 h |
| June | 13.0°C2.7°C | 2.7°C | 21 | 4.1 | 10.010 h |
| July | 12.3°C1.5°C | 1.5°C | 19 | 3.6 | 10.210 h |
| August | 15.1°C3.2°C | 3.2°C | 25 | 4.1 | 10.911 h |
| September, selected | 18.3°C6.1°C | 6.1°C | 28 | 5.0 | 11.912 h |
| October | 21.9°C9.9°C | 9.9°C | 43 | 6.4 | 12.913 h |
| November | 25.0°C13.3°C | 13.3°C | 44 | 7.4 | 13.814 h |
| December | 27.6°C16.3°C | 16.3°C | 48 | 6.8 | 14.314 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- San Martín in SeptemberArgentina · 41 kmHigh 21.1°C · Low 8.5°C · 11 mm rain
- Rawson in SeptemberArgentina · 148 kmHigh 21.5°C · Low 7.3°C · 17 mm rain
- San Juan, Argentina in SeptemberArgentina · 153 kmHigh 21.8°C · Low 8.0°C · 17 mm rain
- Peñalolén in SeptemberChile · 170 kmHigh 16.3°C · Low 4.9°C · 72 mm rain
- Colina in SeptemberChile · 174 kmHigh 18.8°C · Low 7.8°C · 77 mm rain
- Santiago in SeptemberChile · 179 kmHigh 17.6°C · Low 5.0°C · 55 mm rain
- Puente Alto in SeptemberChile · 180 kmHigh 17.2°C · Low 3.8°C · 72 mm rain
- Quilicura in SeptemberChile · 182 kmHigh 18.0°C · Low 6.4°C · 77 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Mendoza) is explained once on the Mendoza year overview and on the Sources, method and limits page.