Click on a day for an hourly weather forecast
The temperatures in Aarau in September are quite cold with temperatures between 8°C and 20°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Aarau 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 Aarau in September 2024.
If you’re planning to visit Aarau in the near future, we highly recommend that you review the 14 day weather forecast for Aarau before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 4° / -4° | 9 | 10 | 12 | 135 mm | Awful | Aarau in January |
| February | 5° / -4° | 8 | 9 | 12 | 106 mm | Awful | Aarau in February |
| March | 10° / -1° | 7 | 17 | 7 | 101 mm | Awful | Aarau in March |
| April | 15° / 2° | 7 | 21 | 2 | 110 mm | Bad | Aarau in April |
| May | 18° / 5° | 11 | 19 | 0 | 213 mm | Ok | Aarau in May |
| June | 22° / 9° | 12 | 18 | 0 | 221 mm | Ok | Aarau in June |
| July | 24° / 11° | 10 | 21 | 0 | 216 mm | Good | Aarau in July |
| August | 24° / 11° | 9 | 22 | 0 | 180 mm | Good | Aarau in August |
| September | 20° / 8° | 5 | 25 | 0 | 109 mm | Good | Aarau in September |
| October | 15° / 4° | 6 | 24 | 0 | 120 mm | Good | Aarau in October |
| November | 9° / 1° | 7 | 18 | 5 | 122 mm | Awful | Aarau in November |
| December | 5° / -3° | 10 | 12 | 10 | 151 mm | Awful | Aarau in December |