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Hamm, North Rhine-Westphalia Weather by Month and Climate Averages
Monthly normals · Rain · Snow
Sunshine · Freeze dates · Records · Best time to visit
What is the weather like in Hamm, North Rhine-Westphalia?
Hamm, North Rhine-Westphalia gets 693 mm of precipitation a year over about 171 rainy days. July is the warmest month (average high 24°C) and February the coldest (average low 0°C).
Oceanic climate
Hamm, North Rhine-Westphalia has warm summers and chilly winters. Daytime highs range from about 6°C in January to 25°C in July. August is usually the wettest month. The most comfortable time to visit is typically May to July and September, when daytime highs sit near 22°C.
| Season | Months | Avg low | Avg high |
|---|---|---|---|
| Winter | Dec–Feb | 1° | 6° |
| Spring | Mar–May | 4° | 15° |
| Summer | Jun–Aug | 12° | 23° |
| Autumn | Sep–Nov | 7° | 15° |
How much rain does Hamm get?
Hamm gets 693 mm of precipitation in an average year, spread over about 171 days with measurable rain. That is more rainy days than 61% of Germany.
August is the wettest month, with 82 mm. April is the driest, with 35 mm. December has the most rainy days, about 18.
The longest dry spell in the last five years lasted 22 days, to August 27, 2025.
From October 2025 to September 2026 Hamm got 565 mm of rain, against a normal of 693 mm for those months. May 2026 had the most, with 120 mm.
Hamm weather by month
Hamm weather in January
In January, Hamm averages a high of 6°C and a low of 1°C. It gets 59 mm of precipitation over about 17 rainy days. Estimated sunshine is 21% of daylight hours, derived from ERA5 cloud cover. The January record high is 17°C (2023) and the record low is -22°C (2009).
Hamm weather in February
In February, Hamm averages a high of 7°C and a low of 0°C. It gets 51 mm of precipitation over about 15 rainy days. Estimated sunshine is 24% of daylight hours, derived from ERA5 cloud cover. The February record high is 19°C (2021) and the record low is -21°C (2021).
Hamm weather in March
In March, Hamm averages a high of 10°C and a low of 2°C. It gets 47 mm of precipitation over about 14 rainy days. Estimated sunshine is 37% of daylight hours, derived from ERA5 cloud cover. The March record high is 26°C (2021) and the record low is -12°C (2013).
Hamm weather in April
In April, Hamm averages a high of 16°C and a low of 4°C. It gets 35 mm of precipitation over about 11 rainy days. Estimated sunshine is 37% of daylight hours, derived from ERA5 cloud cover. The April record high is 28°C (2018) and the record low is -6°C (2013).
Hamm weather in May
In May, Hamm averages a high of 19°C and a low of 8°C. It gets 58 mm of precipitation over about 13 rainy days. Estimated sunshine is 36% 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.
Hamm weather in June
In June, Hamm averages a high of 22°C and a low of 11°C. It gets 61 mm of precipitation over about 13 rainy days. Estimated sunshine is 39% of daylight hours, derived from ERA5 cloud cover. The June record high is 38°C (2026) and the record low is 3°C (2009). June is one of the most comfortable months to visit.
Hamm weather in July
In July, Hamm averages a high of 24°C and a low of 13°C. It gets 81 mm of precipitation over about 15 rainy days. Estimated sunshine is 33% of daylight hours, derived from ERA5 cloud cover. The July record high is 39°C (2019) and the record low is 6°C (2019). July is one of the most comfortable months to visit.
Hamm weather in August
In August, Hamm averages a high of 24°C and a low of 13°C. It gets 82 mm of precipitation over about 15 rainy days. Estimated sunshine is 38% of daylight hours, derived from ERA5 cloud cover. The August record high is 38°C (2018) and the record low is 4°C (2025).
Hamm weather in September
In September, Hamm averages a high of 21°C and a low of 10°C. It gets 52 mm of precipitation over about 12 rainy days. Estimated sunshine is 38% of daylight hours, derived from ERA5 cloud cover. The September record high is 33°C (2013) and the record low is 1°C (2018). September is one of the most comfortable months to visit.
Hamm weather in October
In October, Hamm averages a high of 15°C and a low of 7°C. It gets 54 mm of precipitation over about 13 rainy days. Estimated sunshine is 24% of daylight hours, derived from ERA5 cloud cover. The October record high is 28°C (2018) and the record low is -5°C (2003).
Hamm weather in November
In November, Hamm averages a high of 10°C and a low of 4°C. It gets 59 mm of precipitation over about 15 rainy days. Estimated sunshine is 26% of daylight hours, derived from ERA5 cloud cover. The November record high is 22°C (2014) and the record low is -7°C (2008).
Hamm weather in December
In December, Hamm averages a high of 7°C and a low of 2°C. It gets 54 mm of precipitation over about 18 rainy days. Estimated sunshine is 17% of daylight hours, derived from ERA5 cloud cover. The December record high is 18°C (2022) and the record low is -17°C (2010).
Sunshine, humidity and wind in Hamm
June is the sunniest month in Hamm, with estimated sunshine of 39% of daylight hours from ERA5 cloud cover. December is the cloudiest, at 17%. The annual cloud-cover estimate is 31% of daylight hours; it is not a measurement of sunshine duration. Hamm is cloudier than 68% of Germany.
Humidity peaks in December at 87% and is lowest in June at 64%.
Hamm has about 5 days a year above 32°C. Hamm is hotter than 78% of Germany.
First and last freeze in Hamm
The first fall freeze in Hamm typically comes around November 5, and the last spring freeze around April 21. That leaves a frost-free growing season of about 198 days.
Hamm weather records
These records cover WERL during 1978–2026. Earlier records or other stations in the city may differ.
The hottest temperature on record at the Hamm station is 39°C, on July 30, 2026. The coldest is -22°C, on January 7, 2009.
The wettest day in the available station history brought 82 mm of precipitation, on June 22, 2023.
42 all-time records have been set at the station since 1978.
The best time to visit Hamm
The most comfortable time to visit is typically May to July and 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 15°C and lows near 5°C.
Summer (June–August) is warm, with average highs around 24°C and lows near 12°C.
Autumn (September–November) is mild, with average highs around 15°C and lows near 7°C.
Monthly climate
| Month | Average low | Average high | Precip | Rain days | Humidity | Estimated sunshine | Record high | Record low |
|---|---|---|---|---|---|---|---|---|
| January | 1° | 6° | 59 mm | 17 | 85% | 21% | 17° | -22° |
| February | 0° | 7° | 51 mm | 15 | 80% | 24% | 19° | -21° |
| March | 2° | 10° | 47 mm | 14 | 71% | 37% | 26° | -12° |
| April | 4° | 16° | 35 mm | 11 | 66% | 37% | 28° | -6° |
| May | 8° | 19° | 58 mm | 13 | 67% | 36% | 32° | -1° |
| June | 11° | 22° | 61 mm | 13 | 64% | 39% | 38° | 3° |
| July | 13° | 24° | 81 mm | 15 | 69% | 33% | 39° | 6° |
| August | 13° | 24° | 82 mm | 15 | 70% | 38% | 38° | 4° |
| September | 10° | 21° | 52 mm | 12 | 75% | 38% | 33° | 1° |
| October | 7° | 15° | 54 mm | 13 | 82% | 24% | 28° | -5° |
| November | 4° | 10° | 59 mm | 15 | 85% | 26% | 22° | -7° |
| December | 2° | 7° | 54 mm | 18 | 87% | 17% | 18° | -17° |
Station: WERL, 12 km from the city. Temperature normal baseline: 1991–2020, calculated from available NOAA GHCN-Daily observations. Available station history: 1978–2026; 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.
Hamm climate questions
How much rain does Hamm get?
Hamm gets 693 mm of precipitation in an average year, over about 171 rainy days.
What is the wettest month in Hamm?
August is the wettest month in Hamm, with 82 mm. April is the driest, with 35 mm.
How many rainy days does Hamm have a year?
Hamm has about 171 days with measurable rain in an average year. December has the most, about 18.
What is the hottest month in Hamm?
July is the warmest month in Hamm, with an average high of 24°C.
What is the coldest month in Hamm?
February is the coldest month in Hamm, with an average low of 0°C.
What is the record high temperature in Hamm?
Within the available 1978–2026 station history, the record high at the Hamm station is 39°C, set on July 30, 2026. The record low is -22°C, on January 7, 2009.
What is the sunniest month in Hamm?
June is the sunniest month in Hamm, with estimated sunshine of 39% of daylight hours from ERA5 cloud cover. December is the cloudiest.
When is the first frost in Hamm?
The first fall freeze in Hamm typically comes around November 5. The last spring freeze is around April 21.
What is the best time to visit Hamm?
The most comfortable time to visit is typically May to July and September, when daytime highs sit near 22°C.