Heidelberg, Baden-Wurttemberg Weather by Month and Climate Averages

How much rain does Heidelberg get?

Heidelberg gets 788 mm of precipitation in an average year, spread over about 162 days with measurable rain. That is fewer rainy days than 68% of Germany.

December is the wettest month, with 89 mm. April is the driest, with 46 mm. December has the most rainy days, about 18.

The longest dry spell in the last five years lasted 26 days, to August 17, 2022.

Heidelberg weather by month

Heidelberg weather in January

In January, Heidelberg averages a high of 4°C and a low of -1°C. It gets 75 mm of precipitation over about 17 rainy days. The sun is out about 23% of daylight hours. The January record high is 18°C (2025) and the record low is -14°C (2009).

Heidelberg weather in February

In February, Heidelberg averages a high of 6°C and a low of -1°C. It gets 55 mm of precipitation over about 13 rainy days. The sun is out about 30% of daylight hours. The February record high is 19°C (2020) and the record low is -15°C (2012).

Heidelberg weather in March

In March, Heidelberg averages a high of 11°C and a low of 2°C. It gets 59 mm of precipitation over about 13 rainy days. The sun is out about 40% of daylight hours. The March record high is 24°C (2021) and the record low is -9°C (2010).

Heidelberg weather in April

In April, Heidelberg averages a high of 17°C and a low of 5°C. It gets 46 mm of precipitation over about 11 rainy days. The sun is out about 43% of daylight hours. The April record high is 31°C (2012) and the record low is -4°C (2013).

Heidelberg weather in May

In May, Heidelberg averages a high of 20°C and a low of 9°C. It gets 72 mm of precipitation over about 14 rainy days. The sun is out about 38% of daylight hours. The May record high is 32°C (2017) and the record low is -1°C (2011). May is one of the most comfortable months to visit.

Heidelberg weather in June

In June, Heidelberg averages a high of 24°C and a low of 12°C. It gets 67 mm of precipitation over about 12 rainy days. The sun is out about 42% of daylight hours. The June record high is 39°C (2026) and the record low is 6°C (2024). June is one of the most comfortable months to visit.

Heidelberg weather in July

In July, Heidelberg averages a high of 26°C and a low of 14°C. It gets 69 mm of precipitation over about 12 rainy days. The sun is out about 43% of daylight hours. The July record high is 39°C (2026) and the record low is 6°C (2019). July is one of the most comfortable months to visit.

Heidelberg weather in August

In August, Heidelberg averages a high of 25°C and a low of 13°C. It gets 68 mm of precipitation over about 13 rainy days. The sun is out about 42% of daylight hours. The August record high is 39°C (2015) and the record low is 6°C (2009). August is one of the most comfortable months to visit.

Heidelberg weather in September

In September, Heidelberg averages a high of 21°C and a low of 10°C. It gets 56 mm of precipitation over about 10 rainy days. The sun is out about 45% of daylight hours. The September record high is 32°C (2024) and the record low is 2°C (2010). September is one of the most comfortable months to visit.

Heidelberg weather in October

In October, Heidelberg averages a high of 15°C and a low of 6°C. It gets 62 mm of precipitation over about 14 rainy days. The sun is out about 28% of daylight hours. The October record high is 28°C (2023) and the record low is -5°C (2012).

Heidelberg weather in November

In November, Heidelberg averages a high of 9°C and a low of 3°C. It gets 69 mm of precipitation over about 14 rainy days. The sun is out about 25% of daylight hours. The November record high is 22°C (2020) and the record low is -8°C (2025).

Heidelberg weather in December

In December, Heidelberg averages a high of 6°C and a low of 1°C. It gets 89 mm of precipitation over about 18 rainy days. The sun is out about 18% of daylight hours. The December record high is 18°C (2022) and the record low is -16°C (2009).

Sunshine, humidity and wind in Heidelberg

September is the sunniest month in Heidelberg, with sunshine about 45% of daylight hours. December is the cloudiest, at 18%. Over the year the sun shines about 35% of daylight hours. Heidelberg is sunnier than 88% of Germany.

Humidity peaks in December at 88% and is lowest in July at 59%.

Heidelberg has about 8 days a year above 32°C. Heidelberg is hotter than 98% of Germany.

First and last freeze in Heidelberg

The first fall freeze in Heidelberg typically comes around October 31, and the last spring freeze around April 16. That leaves a frost-free growing season of about 198 days.

Heidelberg weather records

The hottest temperature on record at the Heidelberg station is 39°C, on July 30, 2026. The coldest is -16°C, on December 20, 2009.

The wettest day on record brought 55 mm of rain, on May 29, 2016.

The best time to visit Heidelberg

The most comfortable time to visit is typically May to September, when daytime highs sit near 23°C.

Winter (December–February) is chilly, with average highs around 5°C and lows near 0°C.

Spring (March–May) is mild, with average highs around 16°C and lows near 5°C.

Summer (June–August) is warm, with average highs around 25°C and lows near 13°C.

Autumn (September–November) is mild, with average highs around 15°C and lows near 6°C.

Heidelberg climate questions

How much rain does Heidelberg get?

Heidelberg gets 788 mm of precipitation in an average year, over about 162 rainy days.

What is the wettest month in Heidelberg?

December is the wettest month in Heidelberg, with 89 mm. April is the driest, with 46 mm.

How many rainy days does Heidelberg have a year?

Heidelberg has about 162 days with measurable rain in an average year. December has the most, about 18.

What is the hottest month in Heidelberg?

July is the warmest month in Heidelberg, with an average high of 26°C.

What is the coldest month in Heidelberg?

January is the coldest month in Heidelberg, with an average low of -1°C.

What is the record high temperature in Heidelberg?

The record high at the Heidelberg station is 39°C, set on July 30, 2026. The record low is -16°C, on December 20, 2009.

What is the sunniest month in Heidelberg?

September is the sunniest month in Heidelberg, with sunshine about 45% of daylight hours. December is the cloudiest.

When is the first frost in Heidelberg?

The first fall freeze in Heidelberg typically comes around October 31. The last spring freeze is around April 16.

What is the best time to visit Heidelberg?

The most comfortable time to visit is typically May to September, when daytime highs sit near 23°C.