Heidelberg Weather & Climate: Best Time to Visit

The weather in Heidelberg changes moderately throughout the year, offering enough variation to appreciate each season. Typically, average maximum daytime temperatures range from a comfortable 27°C (81°F) in January to a pleasant 20°C (68°F) in the coolest month, July.

Nights vary from 16°C (61°F) in January to around 3°C (37°F) during the colder months.

Check out our detailed temperature page for more information.

Temperature ranges by month

On average, Heidelberg receives a reasonable amount of rainfall, with an annual precipitation of 801 mm (32 in). The climate in Heidelberg shows significant variation throughout the year. Expect high rainfall in December, the wettest month, with an average of 150 mm (5.9 in) of precipitation over 13 rainy days.

In contrast, the driest month July offers drier and sunnier days, with around 4.2 mm (0.2 in) of rainfall over a single rainy day. For more details, please visit our Heidelberg Precipitation page.

The mean monthly precipitation over the year, including rain, hail, and snow

The average number of days each month with precipitation

Heidelberg offers a pleasant mix of sunny and slightly overcast days. The difference in sunshine hours between July (9.5 hours daily) and February (7.5 hours daily) provides a bit of variety for visitors and residents.

Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Daily hours of sunshine

Daily percentage of sunshine

The relative humidity is moderate throughout the year in Heidelberg.

The city experiences its highest humidity in February, reaching 70%. In August, the humidity drops to its lowest level at 46%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year