Click on a day for an hourly weather forecast
The temperatures in Giessen in May are quite cold with temperatures between 7°C and 18°C, warm clothes are a must.
You can expect rain for roughly half of the month of May in Giessen. 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 Giessen in May 2026.
If you’re planning to visit Giessen in the near future, we highly recommend that you review the 14 day weather forecast for Giessen before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 2° / -4° | 8 | 8 | 15 | 142 mm | Awful | Giessen in January |
| February | 4° / -3° | 8 | 9 | 12 | 101 mm | Awful | Giessen in February |
| March | 9° / 0° | 8 | 16 | 7 | 104 mm | Awful | Giessen in March |
| April | 14° / 3° | 7 | 21 | 3 | 83 mm | Bad | Giessen in April |
| May | 18° / 7° | 12 | 19 | 0 | 189 mm | Ok | Giessen in May |
| June | 22° / 11° | 10 | 20 | 0 | 203 mm | Ok | Giessen in June |
| July | 23° / 12° | 10 | 22 | 0 | 182 mm | Good | Giessen in July |
| August | 23° / 12° | 9 | 22 | 0 | 163 mm | Good | Giessen in August |
| September | 19° / 9° | 6 | 24 | 0 | 104 mm | Good | Giessen in September |
| October | 14° / 5° | 7 | 24 | 1 | 93 mm | Ok | Giessen in October |
| November | 9° / 1° | 6 | 19 | 5 | 73 mm | Bad | Giessen in November |
| December | 4° / -2° | 10 | 10 | 11 | 122 mm | Awful | Giessen in December |