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

Aachen weather by month

Aachen weather in January

In January, Aachen averages a high of 7°C and a low of 2°C. The sun is out about 22% of daylight hours. The January record high is 16°C (2023) and the record low is -9°C (2017).

Aachen weather in March

In March, Aachen averages a high of 12°C and a low of 4°C. The sun is out about 36% of daylight hours. The March record high is 24°C (2021) and the record low is -10°C (2013).

Aachen weather in April

In April, Aachen averages a high of 15°C and a low of 5°C. The sun is out about 39% of daylight hours. The April record high is 27°C (2018) and the record low is -4°C (2013).

Aachen weather in May

In May, Aachen averages a high of 18°C and a low of 8°C. The sun is out about 36% of daylight hours. The May record high is 31°C (2026) and the record low is 0°C (2021).

Aachen weather in June

In June, Aachen averages a high of 21°C and a low of 11°C. The sun is out about 42% of daylight hours. The June record high is 37°C (2026) and the record low is 4°C (2012).

Aachen weather in July

In July, Aachen averages a high of 23°C and a low of 13°C. The sun is out about 36% of daylight hours. The July record high is 38°C (2022) and the record low is 6°C (2019).

Aachen weather in August

In August, Aachen averages a high of 23°C and a low of 13°C. The sun is out about 39% of daylight hours. The August record high is 36°C (2012) and the record low is 8°C (2011).

Aachen weather in September

In September, Aachen averages a high of 19°C and a low of 11°C. The sun is out about 39% of daylight hours. The September record high is 33°C (2024) and the record low is 3°C (2018).

Aachen weather in October

In October, Aachen averages a high of 14°C and a low of 8°C. The sun is out about 26% of daylight hours. The October record high is 27°C (2023) and the record low is -3°C (2012).

Aachen weather in November

In November, Aachen averages a high of 10°C and a low of 4°C. The sun is out about 26% of daylight hours. The November record high is 22°C (2014) and the record low is -4°C (2016).

Aachen weather in December

In December, Aachen averages a high of 7°C and a low of 3°C. The sun is out about 18% of daylight hours. The December record high is 16°C (2022) and the record low is -8°C (2022).

Sunshine, humidity and wind in Aachen

June is the sunniest month in Aachen, with sunshine about 42% of daylight hours. December is the cloudiest, at 18%. Over the year the sun shines about 32% of daylight hours. Aachen is sunnier than 54% of Germany.

Humidity peaks in December at 88% and is lowest in April at 67%.

Aachen has about 4 days a year above 32°C. Aachen is cooler than 56% of Germany.

First and last freeze in Aachen

The first fall freeze in Aachen typically comes around November 21, and the last spring freeze around April 15. That leaves a frost-free growing season of about 220 days.

Aachen weather records

The hottest temperature on record at the Aachen station is 38°C, on July 25, 2019. The coldest is -16°C, on February 7, 2012.

The wettest day on record brought 99 mm of rain, on July 14, 2021.

Aachen climate questions

What is the hottest month in Aachen?

July is the warmest month in Aachen, with an average high of 23°C.

What is the coldest month in Aachen?

January is the coldest month in Aachen, with an average low of 2°C.

What is the record high temperature in Aachen?

The record high at the Aachen station is 38°C, set on July 25, 2019. The record low is -16°C, on February 7, 2012.

What is the sunniest month in Aachen?

June is the sunniest month in Aachen, with sunshine about 42% of daylight hours. December is the cloudiest.

When is the first frost in Aachen?

The first fall freeze in Aachen typically comes around November 21. The last spring freeze is around April 15.