Climate averages 1991–2020
Dortmund weather
in May.
A mild, moderately wet month: the 5th warmest and the 3rd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a mild month in Dortmund: daytime highs average 17.7°C and nights cool to about 9.0°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 69 mm of rain on roughly 13 days, which makes May a moderately wet month (the 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 15 h 35 min on an average May day.
The nearest other city in this atlas is Witten (11 km away). In May its highs average 17.6°C, about as warm as Dortmund, with 67 mm of rain.
Among the 120 cities listed in Germany, Dortmund ranks joint 77th of 120 for the warmest May highs and joint 83rd of 120 for the driest May (rainfall, lowest first). The mean May high of those 120 cities is 17.9°C; Dortmund is 0.2°C cooler than that mean.
From May to June, average highs rise by 2.9°C to 20.5°C, and monthly rainfall rises from 69 mm to 76 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
Dortmund climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 4.7°C0.1°C | 0.1°C | 83 | 14.3 | 8.48 h |
| February | 5.9°C0.2°C | 0.2°C | 68 | 12.5 | 9.910 h |
| March | 9.5°C2.2°C | 2.2°C | 72 | 13.7 | 11.812 h |
| April | 13.9°C5.1°C | 5.1°C | 57 | 11.5 | 13.814 h |
| May, selected | 17.7°C9.0°C | 9.0°C | 69 | 12.7 | 15.616 h |
| June | 20.5°C12.2°C | 12.2°C | 76 | 12.6 | 16.517 h |
| July | 22.6°C14.4°C | 14.4°C | 90 | 14.2 | 16.116 h |
| August | 22.4°C14.3°C | 14.3°C | 87 | 13.5 | 14.615 h |
| September | 18.6°C11.3°C | 11.3°C | 75 | 12.0 | 12.713 h |
| October | 13.8°C8.0°C | 8.0°C | 74 | 12.3 | 10.711 h |
| November | 8.8°C4.1°C | 4.1°C | 75 | 14.1 | 8.99 h |
| December | 5.3°C1.2°C | 1.2°C | 87 | 14.7 | 7.98 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
- Witten in MayGermany · 11 kmHigh 17.6°C · Low 9.2°C · 67 mm rain
- Castrop-Rauxel in MayGermany · 12 kmHigh 17.8°C · Low 9.0°C · 67 mm rain
- Lünen in MayGermany · 12 kmHigh 17.9°C · Low 9.2°C · 69 mm rain
- Hagen in MayGermany · 17 kmHigh 17.5°C · Low 9.3°C · 83 mm rain
- Bochum in MayGermany · 18 kmHigh 17.7°C · Low 9.0°C · 67 mm rain
- Recklinghausen in MayGermany · 22 kmHigh 17.8°C · Low 9.0°C · 67 mm rain
- Iserlohn in MayGermany · 23 kmHigh 16.5°C · Low 8.3°C · 67 mm rain
- Gelsenkirchen in MayGermany · 26 kmHigh 18.1°C · Low 9.3°C · 62 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 Dortmund) is explained once on the Dortmund year overview and on the Sources, method and limits page.
Lünen lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.