Climate averages 1991–2020
Hamm 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 Hamm: daytime highs average 17.7°C and nights cool to about 8.9°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 57 mm of rain on roughly 11 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 36 min on an average May day.
The nearest other city in this atlas is Lünen (21 km away). In May its highs average 17.9°C, about as warm as Hamm, with 69 mm of rain.
Among the 120 cities listed in Germany, Hamm ranks joint 77th of 120 for the warmest May highs and joint 7th of 120 for the driest May (rainfall, lowest first). The mean May high of those 120 cities is 17.9°C; Hamm is 0.2°C cooler than that mean.
From May to June, average highs rise by 2.9°C to 20.6°C, and monthly rainfall rises from 57 mm to 63 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
Hamm climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 4.7°C0.2°C | 0.2°C | 70 | 13.6 | 8.48 h |
| February | 5.9°C0.2°C | 0.2°C | 57 | 11.6 | 9.910 h |
| March | 9.5°C2.1°C | 2.1°C | 60 | 12.5 | 11.812 h |
| April | 13.8°C4.9°C | 4.9°C | 48 | 10.6 | 13.814 h |
| May, selected | 17.7°C8.9°C | 8.9°C | 57 | 11.4 | 15.616 h |
| June | 20.6°C12.1°C | 12.1°C | 63 | 11.2 | 16.617 h |
| July | 22.7°C14.4°C | 14.4°C | 72 | 12.9 | 16.216 h |
| August | 22.5°C14.3°C | 14.3°C | 75 | 12.2 | 14.615 h |
| September | 18.7°C11.3°C | 11.3°C | 63 | 11.0 | 12.713 h |
| October | 13.9°C7.9°C | 7.9°C | 65 | 11.8 | 10.711 h |
| November | 8.8°C4.0°C | 4.0°C | 66 | 12.8 | 8.99 h |
| December | 5.4°C1.2°C | 1.2°C | 73 | 13.4 | 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
- Lünen in MayGermany · 21 kmHigh 17.9°C · Low 9.2°C · 69 mm rain
- Dortmund in MayGermany · 31 kmHigh 17.7°C · Low 9.0°C · 69 mm rain
- Münster in MayGermany · 34 kmHigh 17.9°C · Low 9.0°C · 57 mm rain
- Iserlohn in MayGermany · 35 kmHigh 16.5°C · Low 8.3°C · 67 mm rain
- Arnsberg in MayGermany · 38 kmHigh 16.3°C · Low 8.0°C · 68 mm rain
- Castrop-Rauxel in MayGermany · 38 kmHigh 17.8°C · Low 9.0°C · 67 mm rain
- Witten in MayGermany · 42 kmHigh 17.6°C · Low 9.2°C · 67 mm rain
- Hagen in MayGermany · 43 kmHigh 17.5°C · Low 9.3°C · 83 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 Hamm) is explained once on the Hamm year overview and on the Sources, method and limits page.