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Heidelberg, Baden-Wurttemberg Weather by Month and Climate Averages
Monthly normals · Rain · Snow
Sunshine · Freeze dates · Records · Best time to visit
What is the weather like in Heidelberg, Baden-Wurttemberg?
Heidelberg, Baden-Wurttemberg gets 788 mm of precipitation a year over about 162 rainy days. July is the warmest month (average high 26°C) and January the coldest (average low -1°C).
Oceanic climate
Heidelberg, Baden-Wurttemberg has warm summers and chilly winters. Daytime highs range from about 4°C in January to 26°C in July. December is usually the wettest month. The most comfortable time to visit is typically May to September, when daytime highs sit near 23°C.
| Season | Months | Avg low | Avg high |
|---|---|---|---|
| Winter | Dec–Feb | -1° | 5° |
| Spring | Mar–May | 5° | 16° |
| Summer | Jun–Aug | 13° | 25° |
| Autumn | Sep–Nov | 6° | 15° |
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.
From October 2025 to September 2026 Heidelberg got 486 mm of rain, against a normal of 788 mm for those months. February 2026 had the most, with 120 mm.
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. Estimated sunshine is 23% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 30% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 40% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 43% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 38% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 42% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 43% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 42% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 45% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 28% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 25% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 18% of daylight hours, derived from ERA5 cloud cover. 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 estimated sunshine of 45% of daylight hours from ERA5 cloud cover. December is the cloudiest, at 18%. The annual cloud-cover estimate is 35% of daylight hours; it is not a measurement of sunshine duration. Heidelberg is sunnier than 88% of Germany.
Humidity peaks in December at 88% and is lowest in July at 59%.
Heidelberg has about 9 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
These records cover WAIBSTADT during 2007–2026. Earlier records or other stations in the city may differ.
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 in the available station history brought 55 mm of precipitation, 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.
Monthly climate
| Month | Average low | Average high | Precip | Rain days | Humidity | Estimated sunshine | Record high | Record low |
|---|---|---|---|---|---|---|---|---|
| January | -1° | 4° | 75 mm | 17 | 85% | 23% | 18° | -14° |
| February | -1° | 6° | 55 mm | 13 | 78% | 30% | 19° | -15° |
| March | 2° | 11° | 59 mm | 13 | 68% | 40% | 24° | -9° |
| April | 5° | 17° | 46 mm | 11 | 63% | 43% | 31° | -4° |
| May | 9° | 20° | 72 mm | 14 | 66% | 38% | 32° | -1° |
| June | 12° | 24° | 67 mm | 12 | 62% | 42% | 39° | 6° |
| July | 14° | 26° | 69 mm | 12 | 59% | 43% | 39° | 6° |
| August | 13° | 25° | 68 mm | 13 | 64% | 42% | 39° | 6° |
| September | 10° | 21° | 56 mm | 10 | 72% | 45% | 32° | 2° |
| October | 6° | 15° | 62 mm | 14 | 83% | 28% | 28° | -5° |
| November | 3° | 9° | 69 mm | 14 | 87% | 25% | 22° | -8° |
| December | 1° | 6° | 89 mm | 18 | 88% | 18% | 18° | -16° |
Station: WAIBSTADT, 20 km from the city. Temperature normal baseline: 1991–2020, calculated from available NOAA GHCN-Daily observations. Available station history: 2007–2026; record values refer to this station and period, not the entire city’s history. Precipitation includes rain and the water equivalent of frozen precipitation; snowfall depth is shown separately when available. Sources and methods
From ERA5 reanalysis. Sunshine is estimated from cloud cover.
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?
Within the available 2007–2026 station history, 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 estimated sunshine of 45% of daylight hours from ERA5 cloud cover. 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.