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Heilbronn, 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 Heilbronn, Baden-Wurttemberg?
Heilbronn, Baden-Wurttemberg gets 802 mm of precipitation a year over about 160 rainy days. July is the warmest month (average high 27°C) and January the coldest (average low -1°C).
Oceanic climate
Heilbronn, Baden-Wurttemberg has warm summers and chilly winters. Daytime highs range from about 5°C in January to 27°C in July. July is usually the wettest month. The most comfortable time to visit is typically April to June and August to September, when daytime highs sit near 22°C.
| Season | Months | Avg low | Avg high |
|---|---|---|---|
| Winter | Dec–Feb | -1° | 6° |
| Spring | Mar–May | 5° | 16° |
| Summer | Jun–Aug | 13° | 26° |
| Autumn | Sep–Nov | 6° | 16° |
How much rain does Heilbronn get?
Heilbronn gets 802 mm of precipitation in an average year, spread over about 160 days with measurable rain. That is fewer rainy days than 72% of Germany.
July is the wettest month, with 84 mm. April is the driest, with 47 mm. December has the most rainy days, about 17.
The longest dry spell in the last five years lasted 22 days, to June 7, 2023.
From October 2025 to September 2026 Heilbronn got 538 mm of rain, against a normal of 802 mm for those months. February 2026 had the most, with 105 mm.
Heilbronn weather by month
Heilbronn weather in January
In January, Heilbronn averages a high of 5°C and a low of -1°C. It gets 58 mm of precipitation over about 15 rainy days. Estimated sunshine is 23% of daylight hours, derived from ERA5 cloud cover. The January record high is 18°C (2023) and the record low is -16°C (2009).
Heilbronn weather in February
In February, Heilbronn averages a high of 6°C and a low of -1°C. It gets 54 mm of precipitation over about 14 rainy days. Estimated sunshine is 30% of daylight hours, derived from ERA5 cloud cover. The February record high is 21°C (2021) and the record low is -17°C (2012).
Heilbronn weather in March
In March, Heilbronn averages a high of 11°C and a low of 1°C. It gets 62 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 26°C (2021) and the record low is -17°C (2005).
Heilbronn weather in April
In April, Heilbronn averages a high of 17°C and a low of 5°C. It gets 47 mm of precipitation over about 12 rainy days. Estimated sunshine is 41% of daylight hours, derived from ERA5 cloud cover. The April record high is 31°C (2012) and the record low is -4°C (2013). April is one of the most comfortable months to visit.
Heilbronn weather in May
In May, Heilbronn averages a high of 21°C and a low of 9°C. It gets 78 mm of precipitation over about 13 rainy days. Estimated sunshine is 38% of daylight hours, derived from ERA5 cloud cover. The May record high is 33°C (2017) and the record low is -2°C (2011). May is one of the most comfortable months to visit.
Heilbronn weather in June
In June, Heilbronn averages a high of 24°C and a low of 12°C. It gets 76 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 3°C (2006). June is one of the most comfortable months to visit.
Heilbronn weather in July
In July, Heilbronn averages a high of 27°C and a low of 14°C. It gets 84 mm of precipitation over about 13 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).
Heilbronn weather in August
In August, Heilbronn averages a high of 26°C and a low of 13°C. It gets 73 mm of precipitation over about 12 rainy days. Estimated sunshine is 43% of daylight hours, derived from ERA5 cloud cover. The August record high is 39°C (2015) and the record low is 6°C (2007). August is one of the most comfortable months to visit.
Heilbronn weather in September
In September, Heilbronn averages a high of 22°C and a low of 10°C. It gets 61 mm of precipitation over about 11 rainy days. Estimated sunshine is 44% of daylight hours, derived from ERA5 cloud cover. The September record high is 33°C (2016) and the record low is 1°C (2018). September is one of the most comfortable months to visit.
Heilbronn weather in October
In October, Heilbronn averages a high of 16°C and a low of 6°C. It gets 70 mm of precipitation over about 13 rainy days. Estimated sunshine is 27% of daylight hours, derived from ERA5 cloud cover. The October record high is 29°C (2023) and the record low is -6°C (2012).
Heilbronn weather in November
In November, Heilbronn averages a high of 9°C and a low of 3°C. It gets 64 mm of precipitation over about 14 rainy days. Estimated sunshine is 24% of daylight hours, derived from ERA5 cloud cover. The November record high is 22°C (2020) and the record low is -11°C (2025).
Heilbronn weather in December
In December, Heilbronn averages a high of 6°C and a low of 0°C. It gets 75 mm of precipitation over about 17 rainy days. Estimated sunshine is 18% of daylight hours, derived from ERA5 cloud cover. The December record high is 19°C (2022) and the record low is -17°C (2009).
Sunshine, humidity and wind in Heilbronn
September is the sunniest month in Heilbronn, with estimated sunshine of 44% of daylight hours from ERA5 cloud cover. December is the cloudiest, at 18%. The annual cloud-cover estimate is 34% of daylight hours; it is not a measurement of sunshine duration. Heilbronn is sunnier than 86% of Germany.
Humidity peaks in December at 88% and is lowest in July at 61%.
Heilbronn has about 10 days a year above 32°C. Heilbronn is hotter than 99% of Germany.
First and last freeze in Heilbronn
The first fall freeze in Heilbronn typically comes around November 2, and the last spring freeze around April 19. That leaves a frost-free growing season of about 197 days.
Heilbronn weather records
These records cover OBERSULM-WILLSBACH during 1970–2026. Earlier records or other stations in the city may differ.
The hottest temperature on record at the Heilbronn station is 39°C, on June 27, 2026. The coldest is -17°C, on December 26, 2010.
The wettest day in the available station history brought 117 mm of precipitation, on June 17, 1978.
57 all-time records have been set at the station since 1970.
The best time to visit Heilbronn
The most comfortable time to visit is typically April to June and August to September, when daytime highs sit near 22°C.
Winter (December–February) is chilly, with average highs around 6°C and lows near -1°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 26°C and lows near 13°C.
Autumn (September–November) is mild, with average highs around 16°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° | 5° | 58 mm | 15 | 85% | 23% | 18° | -16° |
| February | -1° | 6° | 54 mm | 14 | 78% | 30% | 21° | -17° |
| March | 1° | 11° | 62 mm | 13 | 67% | 40% | 26° | -17° |
| April | 5° | 17° | 47 mm | 12 | 63% | 41% | 31° | -4° |
| May | 9° | 21° | 78 mm | 13 | 66% | 38% | 33° | -2° |
| June | 12° | 24° | 76 mm | 12 | 64% | 42% | 39° | 3° |
| July | 14° | 27° | 84 mm | 13 | 61% | 43% | 39° | 6° |
| August | 13° | 26° | 73 mm | 12 | 66% | 43% | 39° | 6° |
| September | 10° | 22° | 61 mm | 11 | 73% | 44% | 33° | 1° |
| October | 6° | 16° | 70 mm | 13 | 83% | 27% | 29° | -6° |
| November | 3° | 9° | 64 mm | 14 | 87% | 24% | 22° | -11° |
| December | 0° | 6° | 75 mm | 17 | 88% | 18% | 19° | -17° |
Station: OBERSULM-WILLSBACH, 10 km from the city. Temperature normal baseline: 1991–2020, calculated from available NOAA GHCN-Daily observations. Available station history: 1970–2026; 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.
Heilbronn climate questions
How much rain does Heilbronn get?
Heilbronn gets 802 mm of precipitation in an average year, over about 160 rainy days.
What is the wettest month in Heilbronn?
July is the wettest month in Heilbronn, with 84 mm. April is the driest, with 47 mm.
How many rainy days does Heilbronn have a year?
Heilbronn has about 160 days with measurable rain in an average year. December has the most, about 17.
What is the hottest month in Heilbronn?
July is the warmest month in Heilbronn, with an average high of 27°C.
What is the coldest month in Heilbronn?
January is the coldest month in Heilbronn, with an average low of -1°C.
What is the record high temperature in Heilbronn?
Within the available 1970–2026 station history, the record high at the Heilbronn station is 39°C, set on June 27, 2026. The record low is -17°C, on December 26, 2010.
What is the sunniest month in Heilbronn?
September is the sunniest month in Heilbronn, with estimated sunshine of 44% of daylight hours from ERA5 cloud cover. December is the cloudiest.
When is the first frost in Heilbronn?
The first fall freeze in Heilbronn typically comes around November 2. The last spring freeze is around April 19.
What is the best time to visit Heilbronn?
The most comfortable time to visit is typically April to June and August to September, when daytime highs sit near 22°C.