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Aachen, 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 Aachen, North Rhine-Westphalia?
July is the warmest month (average high 23°C) and January the coldest (average low 2°C).
Aachen climate at a glance
Aachen weather by month
Aachen weather in January
In January, Aachen averages a high of 7°C and a low of 2°C. Estimated sunshine is 22% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 36% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 39% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 36% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 42% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 36% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 39% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 39% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 26% of daylight hours, derived from ERA5 cloud cover. 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. 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 -4°C (2016).
Aachen weather in December
In December, Aachen averages a high of 7°C and a low of 3°C. Estimated sunshine is 18% of daylight hours, derived from ERA5 cloud cover. 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 estimated sunshine of 42% of daylight hours from ERA5 cloud cover. December is the cloudiest, at 18%. The annual cloud-cover estimate is 32% of daylight hours; it is not a measurement of sunshine duration. 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 54% 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
These records cover AACHEN-ORSBACH during 2011–2026. Earlier records or other stations in the city may differ.
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 in the available station history brought 99 mm of precipitation, on July 14, 2021.
Monthly climate
| Month | Average low | Average high | Precip | Rain days | Humidity | Estimated sunshine | Record high | Record low |
|---|---|---|---|---|---|---|---|---|
| January | 2° | 7° | — | — | 87% | 22% | 16° | -9° |
| February | — | — | — | — | 80% | 26% | 20° | -16° |
| March | 4° | 12° | — | — | 70% | 36% | 24° | -10° |
| April | 5° | 15° | 39 mm | 11 | 67% | 39% | 27° | -4° |
| May | 8° | 18° | 61 mm | 13 | 69% | 36% | 31° | 0° |
| June | 11° | 21° | 82 mm | 14 | 67% | 42% | 37° | 4° |
| July | 13° | 23° | 70 mm | 13 | 69% | 36% | 38° | 6° |
| August | 13° | 23° | 76 mm | 15 | 70% | 39% | 36° | 8° |
| September | 11° | 19° | 54 mm | 13 | 76% | 39% | 33° | 3° |
| October | 8° | 14° | 69 mm | 16 | 83% | 26% | 27° | -3° |
| November | 4° | 10° | 59 mm | 15 | 86% | 26% | 22° | -4° |
| December | 3° | 7° | 85 mm | 20 | 88% | 18% | 16° | -8° |
Station: AACHEN-ORSBACH, 5 km from the city. Temperature normal baseline: 1991–2020, calculated from available NOAA GHCN-Daily observations. Available station history: 2011–2026; 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.
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?
Within the available 2011–2026 station history, 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 estimated sunshine of 42% of daylight hours from ERA5 cloud cover. 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.