Click on a day for an hourly weather forecast
The temperatures in Aarau in May are quite cold with temperatures between 5°C and 18°C, warm clothes are a must.
You can expect rain for roughly half of the month of May in Aarau. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
Our weather forecast can give you a great sense of what weather to expect in Aarau in May 2025.
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 |