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The temperatures in St. Gallen in May are quite cold with temperatures between 5°C and 16°C, warm clothes are a must.
You can expect rain for roughly half of the month of May in St. Gallen. 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.
Please note that St. Gallen can expect a few days of snow in May.
Our weather forecast can give you a great sense of what weather to expect in St. Gallen in May 2025.
If you’re planning to visit St. Gallen in the near future, we highly recommend that you review the 14 day weather forecast for St. Gallen before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 2° / -6° | 7 | 8 | 17 | 127 mm | Awful | St. Gallen in January |
| February | 3° / -6° | 5 | 8 | 16 | 88 mm | Awful | St. Gallen in February |
| March | 7° / -3° | 7 | 13 | 11 | 97 mm | Awful | St. Gallen in March |
| April | 12° / 1° | 7 | 18 | 5 | 84 mm | Awful | St. Gallen in April |
| May | 16° / 5° | 12 | 18 | 1 | 169 mm | Ok | St. Gallen in May |
| June | 20° / 8° | 12 | 18 | 0 | 191 mm | Ok | St. Gallen in June |
| July | 22° / 10° | 11 | 20 | 0 | 160 mm | Ok | St. Gallen in July |
| August | 22° / 10° | 10 | 21 | 0 | 172 mm | Ok | St. Gallen in August |
| September | 19° / 7° | 6 | 24 | 0 | 111 mm | Good | St. Gallen in September |
| October | 14° / 3° | 6 | 23 | 3 | 104 mm | Ok | St. Gallen in October |
| November | 8° / 0° | 5 | 17 | 8 | 85 mm | Bad | St. Gallen in November |
| December | 3° / -4° | 7 | 10 | 14 | 115 mm | Awful | St. Gallen in December |