Climate averages 1991–2020
Heidelberg, Germany weather
in May.
A mild, moderately wet month: the 5th warmest and the 10th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a mild month in Heidelberg, Germany: daytime highs average 19.3°C and nights cool to about 9.9°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 79 mm of rain on roughly 13 days, which makes May a moderately wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 15 h 19 min on an average May day.
The nearest other city in this atlas is Mannheim (19 km away). In May its highs average 19.3°C, about as warm as Heidelberg, Germany, with 67 mm of rain.
Among the 120 cities listed in Germany, Heidelberg, Germany ranks joint 2nd of 120 for the warmest May highs and joint 101st of 120 for the driest May (rainfall, lowest first). The mean May high of those 120 cities is 17.9°C; Heidelberg, Germany is 1.4°C warmer than that mean.
From May to June, average highs rise by 3.5°C to 22.7°C, and monthly rainfall falls from 79 mm to 68 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
Heidelberg, Germany climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 5.0°C-0.4°C | -0.4°C | 80 | 13.1 | 8.79 h |
| February | 6.6°C-0.2°C | -0.2°C | 67 | 11.2 | 10.110 h |
| March | 10.8°C2.4°C | 2.4°C | 75 | 12.5 | 11.912 h |
| April | 15.4°C5.5°C | 5.5°C | 54 | 11.1 | 13.714 h |
| May, selected | 19.3°C9.9°C | 9.9°C | 79 | 12.7 | 15.315 h |
| June | 22.7°C13.4°C | 13.4°C | 68 | 11.9 | 16.216 h |
| July | 24.9°C15.6°C | 15.6°C | 73 | 12.3 | 15.816 h |
| August | 24.9°C15.5°C | 15.5°C | 60 | 10.0 | 14.414 h |
| September | 20.3°C11.7°C | 11.7°C | 66 | 10.0 | 12.713 h |
| October | 15.1°C7.9°C | 7.9°C | 72 | 12.1 | 10.811 h |
| November | 9.2°C3.7°C | 3.7°C | 76 | 12.1 | 9.29 h |
| December | 5.6°C0.7°C | 0.7°C | 95 | 15.1 | 8.38 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
- Mannheim in MayGermany · 19 kmHigh 19.3°C · Low 9.9°C · 67 mm rain
- Ludwigshafen am Rhein in MayGermany · 19 kmHigh 19.4°C · Low 9.9°C · 67 mm rain
- Worms in MayGermany · 35 kmHigh 19.1°C · Low 9.6°C · 61 mm rain
- Heilbronn in MayGermany · 49 kmHigh 19.2°C · Low 9.8°C · 79 mm rain
- Karlsruhe in MayGermany · 49 kmHigh 19.3°C · Low 10.1°C · 79 mm rain
- Darmstadt in MayGermany · 52 kmHigh 18.6°C · Low 9.5°C · 75 mm rain
- Pforzheim in MayGermany · 58 kmHigh 18.7°C · Low 9.6°C · 85 mm rain
- Kaiserslautern in MayGermany · 67 kmHigh 18.4°C · Low 9.8°C · 74 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 Heidelberg) is explained once on the Heidelberg, Germany year overview and on the Sources, method and limits page.