Aachen, Germany Climate & Monthly Averages
Aachen has an oceanic climate. August is the hottest month, averaging 74° by day; January is the coldest at 41°.
How weather changes through the year in Aachen
Aachen is a oceanic city - mild temperatures year-round with regular rainfall. August is the warmest month at 74°F (23°C) and January the coolest at 41°F (5°C), over 36.6 inches (931 mm) of precipitation a year.
Aachen climate quick facts
- Hottest month: August - highs near 74°F (23°C)
- Coldest month: January - highs near 41°F (5°C)
- Decade extremes (2015-2024): 102°F (39°C) high · 12°F (-11°C) low
- Wettest month: January (17 rainy days) · Sunniest: July (11.1 h sun/day)
- Climate type: oceanic
- Annual swing: 16°C between the average warmest and coolest month · day to night: 7°C
- Snow: about 10 days a year
- Average humidity: 77%
Temperatures, rain and sunshine
January is the coolest month, with highs of 41°F (5°C) and lows near 33°F (1°C). August is the warm end of the year, averaging 74°F (23°C) by day and 59°F (15°C) overnight. The wettest month is January (3.8 inches (96 mm) across 17 days) and the driest April.
Days and nights are about 7°C apart on average - narrower than about 82% of the cities we track. Sunshine averages 7.6 hours a day over the year - duller than all but 9% of the 3496 cities in our dataset, peaking in July at 11.1 hours. Snow falls on roughly 10 days a year, mostly November through April. The gridded 2015-2024 daily record for this location tops out at 102°F (39°C) and bottoms at 12°F (-11°C) - decade extremes, not all-time station records.
Where Aachen sits among other climates
- 28% of the year's precipitation falls in its wettest three months - more evenly spread than almost every other city we track.
These comparisons use the same ten-year window for every city in the dataset.
Monthly climate table
| Month | High | Low | Rain days | Precipitation | Sunshine | Daylight | Wet-day chance | Humidity |
|---|---|---|---|---|---|---|---|---|
| January | 41° | 33° | 17 | 3.8 in | 3.5 h/day | 8.4 h | 54% | 86% |
| February | 46° | 35° | 14 | 3.1 in | 5.5 h/day | 9.9 h | 48% | 80% |
| March | 50° | 37° | 14 | 3.4 in | 7.1 h/day | 11.7 h | 45% | 76% |
| April | 56° | 41° | 12 | 2.2 in | 9.4 h/day | 13.7 h | 40% | 72% |
| May | 64° | 48° | 13 | 3.0 in | 10.7 h/day | 15.5 h | 43% | 72% |
| June | 71° | 56° | 12 | 3.2 in | 11.0 h/day | 16.5 h | 39% | 70% |
| July | 73° | 58° | 12 | 2.9 in | 11.1 h/day | 16.1 h | 40% | 69% |
| August | 74° | 59° | 14 | 3.0 in | 10.5 h/day | 14.5 h | 46% | 71% |
| September | 67° | 53° | 11 | 2.9 in | 9.0 h/day | 12.5 h | 38% | 74% |
| October | 59° | 48° | 14 | 2.9 in | 5.9 h/day | 10.6 h | 45% | 81% |
| November | 49° | 40° | 14 | 2.9 in | 4.5 h/day | 8.8 h | 47% | 85% |
| December | 45° | 38° | 16 | 3.4 in | 3.1 h/day | 8.0 h | 52% | 87% |
Aachen month by month
Each card shows the average high and low. The bar places that month between Aachen's coldest night and warmest afternoon.
January
- Rain
- 17 days
- Sunshine
- 3.5 h
- Daylight
- 8.4 h
- Snow
- 3 days
February
- Rain
- 14 days
- Sunshine
- 5.5 h
- Daylight
- 9.9 h
- Snow
- 2 days
March
- Rain
- 14 days
- Sunshine
- 7.1 h
- Daylight
- 11.7 h
- Snow
- 1 day
April
- Rain
- 12 days
- Sunshine
- 9.4 h
- Daylight
- 13.7 h
May
- Rain
- 13 days
- Sunshine
- 10.7 h
- Daylight
- 15.5 h
June
- Rain
- 12 days
- Sunshine
- 11.0 h
- Daylight
- 16.5 h
July
- Rain
- 12 days
- Sunshine
- 11.1 h
- Daylight
- 16.1 h
August
- Rain
- 14 days
- Sunshine
- 10.5 h
- Daylight
- 14.5 h
September
- Rain
- 11 days
- Sunshine
- 9.0 h
- Daylight
- 12.5 h
October
- Rain
- 14 days
- Sunshine
- 5.9 h
- Daylight
- 10.6 h
November
- Rain
- 14 days
- Sunshine
- 4.5 h
- Daylight
- 8.8 h
- Snow
- 1 day
December
- Rain
- 16 days
- Sunshine
- 3.1 h
- Daylight
- 8.0 h
- Snow
- 2 days
Looking for warmer alternatives? Browse warm places by month, or compare Aachen's coolest part of the year: January, December, February.
A season-by-season guide to Aachen
Spring (March through May)
Spring is mild here - highs near 57°F (14°C), nights near 42°F (6°C), and rain falls on around 39 of the 90 days.
Summer (June through August)
Summer is pleasantly warm here - highs near 73°F (23°C), nights near 57°F (14°C), and rain falls on around 38 of the 90 days. Daylight is generous - around 10.9 hours of sun a day.
Fall (September through November)
Fall in Aachen is crisp but comfortable, with daytime highs averaging 59°F (15°C) and nights around 47°F (9°C); rain falls on around 39 of the 90 days.
Winter (December through February)
Winter is chilly here - highs near 44°F (7°C), nights near 35°F (2°C), and rain falls on around 46 of the 90 days, plus about 7 snowy days.
Questions people ask about Aachen's climate
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The most useful weather window for Aachen
Best time to visit Aachen
The best time to visit Aachen is generally April to September, when warm days, manageable rainfall and plenty of daylight line up. Daytime temperatures in that window sit near 68°F (20°C), with rain on about 13 days a month. For the same question asked the other way round, see where else is warm in April.
What to pack
Pack for Aachen with a warm jacket and layers for the cooler season and proper waterproofs rather than an umbrella - wet days are the norm here. Note the gap between afternoon and night: August pairs 74°F (23°C) with 59°F (15°C).
Aachen temperature extremes in the 2015–2024 dataset
Derived from ERA5 reanalysis data, 2015–2024. Official station records may differ. Need another precipitation unit? Use the rainfall converter.