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Heidelberg Weather by Month
Average temperatures, rainfall and humidity for Heidelberg, Germany, month by month, built from OpenWeather's historical records. Use it to see what a typical Heidelberg month looks like before you travel — then check the live Heidelberg forecast for the days ahead.
Warmest month
July
27°C average high
Coolest month
January
1°C average low
Wettest month
July
67 mm of rain
Driest month
April
51 mm of rain
Average temperature and rainfall in Heidelberg by month
Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.
| Month | Avg high | Avg low | Record low / high | Rainfall | Humidity | Wind |
|---|---|---|---|---|---|---|
| January | 6°C | 1°C | -12°C / 16°C | 54 mm | 84% | 11 km/h |
| February | 8°C | 2°C | -11°C / 20°C | 62 mm | 78% | 11 km/h |
| March | 12°C | 3°C | -8°C / 25°C | 53 mm | 70% | 10 km/h |
| April | 16°C | 6°C | -3°C / 27°C | 51 mm | 65% | 10 km/h |
| May | 20°C | 10°C | 1°C / 33°C | 63 mm | 68% | 10 km/h |
| June | 26°C | 15°C | 7°C / 42°C | 61 mm | 66% | 9 km/h |
| July | 27°C | 16°C | 8°C / 39°C | 67 mm | 62% | 9 km/h |
| August | 27°C | 16°C | 5°C / 39°C | 59 mm | 67% | 9 km/h |
| September | 22°C | 12°C | 3°C / 33°C | 62 mm | 74% | 9 km/h |
| October | 16°C | 8°C | -4°C / 27°C | 54 mm | 83% | 9 km/h |
| November | 10°C | 4°C | -7°C / 22°C | 52 mm | 86% | 10 km/h |
| December | 7°C | 2°C | -14°C / 19°C | 53 mm | 87% | 10 km/h |
Best time to visit Heidelberg
The most comfortable time to visit Heidelberg is generally June and August to September, balancing mild daytime temperatures against the driest stretch of the year. The city has strongly marked seasons and rainfall is spread evenly across the months, totalling about 692 mm a year.
Travellers who prefer heat should aim for July, when highs average 27°C. July is the month to avoid if rain would spoil your plans — it averages 67 mm, roughly 1× the rainfall of April.
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Heidelberg forecast for what is happening now.