Weather in Mendoza in September 2025
Average weather
Average temperature in Mendoza in September
The temperature in September is +20°C on average, with a range between a maximum of +31°C during the day and a minimum of +2°C at night.
The average maximum temperature goes down 3% by the end of the month, compared with the beginning of the month, from +23°C to +22°C.
Is Mendoza warm or cold in September?
Mendoza is typically mild in September.
Maximum temperatures go up compared to the previous month from +17°C to +20°C. The minimum temperature also goes up from +5°C to +8°C.
Pack a light jacket as it will be warm in the day and cool in the evenings.
Take a look at how September is compared to other months in Mendoza:
Climate in Mendoza in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +17°C | +20°C | +24°C | ||||
| Min. temperature | ||||||
| -5°C | -3°C | 0°C | ||||
| Max. temperature | ||||||
| +32°C | +33°C | +37°C | ||||
| Rainfall | ||||||
| 23 mm | 30 mm | 43 mm | ||||
| Wind | ||||||
| 1 m/s | 2 m/s | 2 m/s | ||||
| Humidity | ||||||
| 58% | 53% | 49% | ||||
| Air pressure | ||||||
| 1016 HPa | 1015 HPa | 1012 HPa | ||||
| Sunny days | ||||||
| 18 | 16 | 16 | ||||
| Cloudy days | ||||||
| 6 | 5 | 6 | ||||
| Rainy days | ||||||
| 6 | 8 | 9 | ||||
| Snowy days | ||||||
| 1 | 0 | 0 | ||||
September typically has worse weather conditions compared to August. It’s getting warmer as September arrives. The average maximum temperature goes up from +17°C to +20°C during the day. Prepare for more rain. Average rainfall goes from 23 mm to 30 mm. It feels drier, as humidity decreases from 58% to 53%. Winds are stronger in comparison to August, going up from 1 m/s to 2 m/s on average. The days becoming less sunny, going from 18 sunny days in August to 16 in September.
October brings much the same weather, it remains good.
Wind
The average wind speed is 3 m/s getting up to 5 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Mendoza is gradually increasing during September, going from 1 m/s to 2 m/s over the course of the month.
Rain
How was the weather last September in Mendoza?
Climate Change over Years
The climate in Mendoza in September has not changed much over the last 43 years.
The average temperature was the lowest in 1984 (+20°C) and the highest in 2023 (+24°C). The driest year was 2003 with only 151 mm of rainfall, and the wettest year was 1984 with 844 mm.
FAQ
Is September a good time to visit Mendoza?
Can you sunbathe in Mendoza in September?
Is Mendoza rainy in September?
Is it sunny in Mendoza in September?
Other cities in Argentina
Monthly weather in Mendoza
Source of the data
For this page, we’ve looked at the typical weather in Mendoza, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.