Climate averages 1991–2020
Iserlohn weather
in May.
A mild, moderately wet month: the 5th warmest and the joint 2nd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a mild month in Iserlohn: daytime highs average 16.5°C and nights cool to about 8.3°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 67 mm of rain on roughly 13 days, which makes May a moderately wet month (the joint 2nd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 15 h 34 min on an average May day.
The nearest other city in this atlas is Hagen (16 km away). In May its highs average 17.5°C, 1.0°C warmer than Iserlohn, with 83 mm of rain.
Among the 120 cities listed in Germany, Iserlohn ranks joint 111th of 120 for the warmest May highs and joint 71st of 120 for the driest May (rainfall, lowest first). The mean May high of those 120 cities is 17.9°C; Iserlohn is 1.3°C cooler than that mean.
From May to June, average highs rise by 2.9°C to 19.4°C, and monthly rainfall rises from 67 mm to 72 mm.
The annual picture
May in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Iserlohn climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 3.7°C-0.7°C | -0.7°C | 81 | 14.5 | 8.48 h |
| February | 4.7°C-0.8°C | -0.8°C | 67 | 12.4 | 9.910 h |
| March | 8.4°C1.4°C | 1.4°C | 71 | 13.5 | 11.812 h |
| April | 12.8°C4.4°C | 4.4°C | 55 | 11.2 | 13.814 h |
| May, selected | 16.5°C8.3°C | 8.3°C | 67 | 12.6 | 15.616 h |
| June | 19.4°C11.4°C | 11.4°C | 72 | 12.7 | 16.517 h |
| July | 21.4°C13.6°C | 13.6°C | 86 | 14.0 | 16.116 h |
| August | 21.2°C13.5°C | 13.5°C | 84 | 13.1 | 14.615 h |
| September | 17.5°C10.6°C | 10.6°C | 72 | 12.3 | 12.713 h |
| October | 12.8°C7.3°C | 7.3°C | 72 | 12.7 | 10.711 h |
| November | 7.8°C3.4°C | 3.4°C | 75 | 13.7 | 8.99 h |
| December | 4.4°C0.5°C | 0.5°C | 85 | 14.7 | 8.08 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
May in nearby cities
- Hagen in MayGermany · 16 kmHigh 17.5°C · Low 9.3°C · 83 mm rain
- Lüdenscheid in MayGermany · 18 kmHigh 15.8°C · Low 7.7°C · 82 mm rain
- Dortmund in MayGermany · 23 kmHigh 17.7°C · Low 9.0°C · 69 mm rain
- Witten in MayGermany · 25 kmHigh 17.6°C · Low 9.2°C · 67 mm rain
- Arnsberg in MayGermany · 26 kmHigh 16.3°C · Low 8.0°C · 68 mm rain
- Lünen in MayGermany · 29 kmHigh 17.9°C · Low 9.2°C · 69 mm rain
- Castrop-Rauxel in MayGermany · 34 kmHigh 17.8°C · Low 9.0°C · 67 mm rain
- Hamm in MayGermany · 35 kmHigh 17.7°C · Low 8.9°C · 57 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Iserlohn) is explained once on the Iserlohn year overview and on the Sources, method and limits page.