Mendoza Weather in September

In September, Mendoza averages a high of 22°C (71°F) and a low of 7°C (45°F), from 36 years of daily records (1971–2025).

22°C

Average high

71°F

7°C

Average low

45°F

36°C

Record high

97°F · September 11, 1986

-2°C

Record low

28°F · September 15, 1981

What September Is Like in Mendoza

The September heat record, 36°C (97°F) on September 11, 1986, has stood for 39 years.
The coldest September reading, -2°C (28°F) on September 15, 1981, has not been matched in 44 years.
September is the least predictable month in Mendoza: daytime highs vary more from day to day and year to year than in any other month.
On average, 0.5 nights in September drop below freezing.

At least 1 mm of rain falls on 9% of September days.

Average daytime high in Mendoza, every September since 1971

Warmest: 1971 (24.3°C)Latest: 2022 (22.9°C)10-year averageLong-run average (21.2°C)

See the weather in Mendoza on any September date, year by year.

Source: NOAA GHCN-Daily, Mendoza Aero (1971–2025). Averages cover 1971–2025. How we compute this