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The temperatures in Iserlohn in May are quite cold with temperatures between 8°C and 16°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Iserlohn during the month of May. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Please note that Iserlohn can expect a few days of snow in May.
Our weather forecast can give you a great sense of what weather to expect in Iserlohn in May 2026.
If you’re planning to visit Iserlohn in the near future, we highly recommend that you review the 14 day weather forecast for Iserlohn before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 3° / -1° | 9 | 7 | 16 | 123 mm | Awful | Iserlohn in January |
| February | 5° / -1° | 8 | 8 | 13 | 90 mm | Awful | Iserlohn in February |
| March | 9° / 2° | 8 | 15 | 9 | 85 mm | Awful | Iserlohn in March |
| April | 13° / 5° | 6 | 21 | 3 | 64 mm | Bad | Iserlohn in April |
| May | 16° / 8° | 7 | 23 | 1 | 98 mm | Ok | Iserlohn in May |
| June | 20° / 11° | 7 | 23 | 0 | 109 mm | Ok | Iserlohn in June |
| July | 22° / 13° | 8 | 23 | 0 | 135 mm | Ok | Iserlohn in July |
| August | 22° / 14° | 6 | 25 | 0 | 111 mm | Good | Iserlohn in August |
| September | 19° / 11° | 5 | 25 | 0 | 75 mm | Good | Iserlohn in September |
| October | 13° / 7° | 7 | 23 | 1 | 85 mm | Bad | Iserlohn in October |
| November | 8° / 3° | 8 | 17 | 5 | 93 mm | Awful | Iserlohn in November |
| December | 4° / 0° | 10 | 10 | 12 | 128 mm | Awful | Iserlohn in December |