Click on a day for an hourly weather forecast
The temperatures in Ilmenau in May are quite cold with temperatures between 6°C and 17°C, warm clothes are a must.
You can expect rain for roughly half of the month of May in Ilmenau. 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 Ilmenau in May 2026.
If you’re planning to visit Ilmenau in the near future, we highly recommend that you review the 14 day weather forecast for Ilmenau before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 2° / -3° | 9 | 5 | 19 | 104 mm | Awful | Ilmenau in January |
| February | 3° / -3° | 8 | 5 | 16 | 72 mm | Awful | Ilmenau in February |
| March | 8° / 0° | 8 | 12 | 11 | 69 mm | Awful | Ilmenau in March |
| April | 14° / 4° | 5 | 20 | 4 | 58 mm | Ok | Ilmenau in April |
| May | 17° / 6° | 8 | 23 | 0 | 117 mm | Ok | Ilmenau in May |
| June | 21° / 10° | 8 | 22 | 0 | 129 mm | Ok | Ilmenau in June |
| July | 23° / 12° | 7 | 24 | 0 | 124 mm | Good | Ilmenau in July |
| August | 23° / 13° | 6 | 25 | 0 | 107 mm | Perfect | Ilmenau in August |
| September | 19° / 9° | 5 | 25 | 0 | 79 mm | Good | Ilmenau in September |
| October | 13° / 5° | 7 | 22 | 1 | 83 mm | Bad | Ilmenau in October |
| November | 7° / 2° | 8 | 15 | 7 | 84 mm | Awful | Ilmenau in November |
| December | 3° / -1° | 11 | 6 | 15 | 104 mm | Awful | Ilmenau in December |