Weather in Geneva in September 2025
Average weather
Average temperature in Geneva in September
Going from a maximum of +29°C during the day to a minimum of +7°C during the night, the temperature in September averages around +24°C.
The average maximum temperature goes down 18% by the end of the month, compared with the beginning of the month, from +26°C to +22°C.
Is Geneva warm or cold in September?
Geneva is typically mild in September.
Maximum temperatures go down compared to the previous month from +25°C to +21°C. The minimum temperature also goes down from +14°C to +11°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 Geneva:
Climate in Geneva in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +25°C | +21°C | +15°C | ||||
| Min. temperature | ||||||
| +5°C | +2°C | -3°C | ||||
| Max. temperature | ||||||
| +38°C | +31°C | +27°C | ||||
| Rainfall | ||||||
| 142 mm | 122 mm | 133 mm | ||||
| Wind | ||||||
| 1 m/s | 1 m/s | 1 m/s | ||||
| Humidity | ||||||
| 67% | 73% | 79% | ||||
| Air pressure | ||||||
| 1016 HPa | 1017 HPa | 1017 HPa | ||||
| Sunny days | ||||||
| 8 | 7 | 4 | ||||
| Cloudy days | ||||||
| 5 | 9 | 12 | ||||
| Rainy days | ||||||
| 14 | 12 | 14 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September weather is still as good as in August. It’s getting colder in September. From +25°C in the day, the average maximum temperature lowers to +21°C. As September arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 142 mm to 122 mm. Humidity rises from 67% to 73%. The average wind speed doesn’t change much during September, staying around 1 m/s. The days becoming less sunny, going from 8 sunny days in August to 7 in September.
Next month (October) brings a further decline in the weather.
Wind
The average wind speed is 1 m/s getting up to 3 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Geneva is gradually decreasing during September, going from 2 m/s to 1 m/s over the course of the month.
Rain
How was the weather last September in Geneva?
Climate Change over Years
The climate in Geneva in September has not changed much over the last 43 years.
The average temperature was the lowest in 1980 (+12°C) and the highest in 2022 (+18°C). The driest year was 1989 with only 1095 mm of rainfall, and the wettest year was 2021 with 1882 mm.
FAQ
Is September a good time to visit Geneva?
Can you sunbathe in Geneva in September?
Is Geneva rainy in September?
Is it sunny in Geneva in September?
Other cities in Switzerland
Monthly weather in Geneva
Source of the data
For this page, we’ve looked at the typical weather in Geneva, 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.