Click on a day for an hourly weather forecast
The temperatures in Rheinfelden in May are quite cold with temperatures between 7°C and 19°C, warm clothes are a must.
You can expect rain for roughly half of the month of May in Rheinfelden. 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 Rheinfelden in May 2026.
If you’re planning to visit Rheinfelden in the near future, we highly recommend that you review the 14 day weather forecast for Rheinfelden before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 4° / -3° | 10 | 9 | 11 | 125 mm | Awful | Rheinfelden in January |
| February | 6° / -2° | 9 | 10 | 10 | 106 mm | Awful | Rheinfelden in February |
| March | 11° / 1° | 9 | 17 | 5 | 98 mm | Awful | Rheinfelden in March |
| April | 16° / 4° | 7 | 22 | 1 | 104 mm | Ok | Rheinfelden in April |
| May | 19° / 7° | 11 | 20 | 0 | 183 mm | Ok | Rheinfelden in May |
| June | 23° / 11° | 10 | 20 | 0 | 188 mm | Good | Rheinfelden in June |
| July | 25° / 13° | 8 | 23 | 0 | 179 mm | Good | Rheinfelden in July |
| August | 25° / 13° | 8 | 23 | 0 | 150 mm | Good | Rheinfelden in August |
| September | 21° / 9° | 6 | 24 | 0 | 92 mm | Good | Rheinfelden in September |
| October | 16° / 6° | 6 | 24 | 0 | 114 mm | Good | Rheinfelden in October |
| November | 10° / 2° | 8 | 19 | 3 | 126 mm | Awful | Rheinfelden in November |
| December | 6° / -1° | 11 | 12 | 8 | 157 mm | Awful | Rheinfelden in December |