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The temperatures in Geneva in September are quite cold with temperatures between 8°C and 21°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Geneva during the month of September. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in Geneva in September 2025.
If you’re planning to visit Geneva in the near future, we highly recommend that you review the 14 day weather forecast for Geneva before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 5° / -4° | 9 | 12 | 10 | 176 mm | Awful | Geneva in January |
| February | 6° / -4° | 9 | 11 | 9 | 132 mm | Awful | Geneva in February |
| March | 11° / -1° | 8 | 18 | 5 | 132 mm | Awful | Geneva in March |
| April | 15° / 3° | 7 | 22 | 2 | 117 mm | Bad | Geneva in April |
| May | 18° / 5° | 10 | 21 | 0 | 194 mm | Ok | Geneva in May |
| June | 23° / 9° | 10 | 20 | 0 | 190 mm | Good | Geneva in June |
| July | 25° / 11° | 10 | 21 | 0 | 171 mm | Good | Geneva in July |
| August | 25° / 11° | 8 | 23 | 0 | 149 mm | Good | Geneva in August |
| September | 21° / 8° | 6 | 24 | 0 | 116 mm | Good | Geneva in September |
| October | 17° / 4° | 6 | 25 | 0 | 118 mm | Good | Geneva in October |
| November | 11° / 1° | 6 | 20 | 4 | 155 mm | Bad | Geneva in November |
| December | 6° / -2° | 8 | 15 | 7 | 214 mm | Awful | Geneva in December |