Hamm, North Rhine-Westphalia Weather by Month and Climate Averages

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.

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. The sun is out about 21% of daylight hours. 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. The sun is out about 24% of daylight hours. 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. The sun is out about 37% of daylight hours. 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. The sun is out about 37% of daylight hours. 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. The sun is out about 36% 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.

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. The sun is out about 39% of daylight hours. 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. The sun is out about 33% of daylight hours. 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. The sun is out about 38% of daylight hours. 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. The sun is out about 38% of daylight hours. 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. The sun is out about 24% of daylight hours. 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. The sun is out about 26% of daylight hours. 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. The sun is out about 17% of daylight hours. 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 sunshine about 39% of daylight hours. December is the cloudiest, at 17%. Over the year the sun shines about 31% of daylight hours. Hamm is cloudier than 69% 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

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 on record brought 82 mm of rain, 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.

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?

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 sunshine about 39% of daylight hours. 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.