Aachen features a temperate oceanic climate with mild summers and cool, damp winters. Summer highs average 22–24°C, while winter lows often hover around 0°C. Rain falls year-round, with slightly wetter summers, and snowfall is light but possible in winter. Sunshine is most abundant from May to August, making Aachen pleasant for visitors in every season.
The best times to travel section shows how the months compare for a visit, so you can find the time of year that fits what you want to do.
Background colors of the months:
The color shows the typical temperature: yellow (hot), green (mild) and blue (cold). How strong the color is shows the travel season: full color means high season, soft color means shoulder season and soft-striped means off season.
Weather symbols:
Each month has one symbol showing what the weather is typically like, such as hot and sunny, freezing or a rainy or snowy season. Use them to quickly spot months that match the weather you want, or to avoid the ones that don't.
Crowdedness:
The people icon shows how busy the place usually is. The more people, the more crowded it gets.
Additional notes:
The gray info boxes point out special things worth knowing, like recurring weather issues or seasonal events.
Aachen’s climate is influenced by its location in western Germany near the borders of Belgium and the Netherlands, resulting in moderate temperatures and consistent precipitation throughout the year. Summers (June–August) are mild and comfortable, with average highs of 22–24°C and lows around 13°C. July is typically the warmest month. Rainfall is relatively frequent, with June to August each receiving about 75–90 mm of rain, often in the form of brief showers or thunderstorms. Sunshine peaks in summer, with up to 7 hours per day, and daylight can last up to 16 hours in midsummer. Humidity is moderate, making the warmth pleasant rather than oppressive.
Winters (December–February) are cool and damp, with average highs of 4–6°C and lows near or just below freezing. Snow falls on about 20–25 days per year, mainly between December and February, but accumulations are usually light and short-lived. Rain is common, especially in December, the wettest month. Sunshine is limited in winter, with just 2–3 hours per day and short daylight hours. Spring (March–May) and autumn (September–November) are transitional, bringing variable weather, moderate rainfall, and temperatures ranging from 8°C in March to 18°C in May, and cooling from 19°C in September to 6°C in November. Aachen receives about 850–950 mm of precipitation annually and around 1,500–1,700 hours of sunshine. Winds are generally moderate, but can be brisk in autumn and winter, and the city’s proximity to the Eifel mountains can sometimes bring Foehn winds or inversion-related smog.
| Average climate data for Aachen, Germany | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| Average maximum temperature (°F) | 40 | 42 | 49 | 58 | 63 | 69 | 73 | 73 | 66 | 57 | 49 | 42 | 73 |
| Average minimum temperature (°F) | 32 | 33 | 37 | 42 | 47 | 52 | 56 | 57 | 51 | 45 | 40 | 35 | 32 |
| Average precipitation (inch) | 2 | 2 | 2 | 1 | 2 | 2 | 2 | 2 | 1 | 2 | 1 | 2 | 20 |
| Average rainfall days (days) | 13 | 12 | 15 | 15 | 18 | 17 | 19 | 19 | 13 | 14 | 15 | 15 | 186 |
| Average snowfall (inch) | 2 | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 6 |
| Average snowfall days (days) | 6 | 6 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 5 | 20 |
| Average relative humidity (%) | 87 | 84 | 80 | 75 | 80 | 81 | 76 | 74 | 78 | 83 | 85 | 87 | 81 |
| Average wind speed (mph) | 10 | 11 | 9 | 8 | 7 | 7 | 7 | 7 | 7 | 8 | 9 | 11 | 8 |
| Average daily daylight hours (h) | 8 | 10 | 11 | 13 | 15 | 16 | 16 | 14 | 12 | 10 | 9 | 8 | 12 |
| Average daily sunshine hours (h) | 4 | 4 | 5 | 8 | 8 | 8 | 9 | 9 | 8 | 5 | 4 | 3 | 6 |
| Average cloud coverage (%) | 59 | 60 | 51 | 41 | 44 | 45 | 41 | 40 | 40 | 48 | 57 | 62 | 49 |
| Average UV index | 2 | 2 | 3 | 3 | 4 | 5 | 5 | 5 | 3 | 3 | 2 | 2 | 3 |
The best time to visit Aachen is from May to September, when temperatures are mild to warm (18–24°C), days are long, and the city’s parks and gardens are in full bloom. These months offer the best conditions for outdoor sightseeing, festivals, and exploring the historic Old Town, though rain showers are still possible.
The least favorable time to visit is from November to February. These months are the coldest and wettest, with highs of 4–6°C, frequent rain, short daylight hours, and occasional light snow. While the city is quieter and festive markets bring charm, outdoor sightseeing is less appealing due to damp, chilly weather.
Aachen has mild summers (22–24°C), cool winters (4–6°C), and moderate rainfall throughout the year. Snow is possible in winter but usually light. The weather is changeable, so pack layers and a rain jacket.
Yes, Aachen experiences about 20–25 days of snow per year, mainly from December to February. Snowfall is usually light and melts quickly, with rain being more common in winter.
May through August are the sunniest months, with up to 7 hours of sunshine per day and long daylight hours. These months are ideal for outdoor activities and sightseeing.
Aachen receives about 850–950 mm of rain annually, with rain possible in any month. June to August are slightly wetter, but rainfall is spread fairly evenly throughout the year.
Pack layers, a rain jacket or umbrella, and comfortable waterproof shoes. Even in summer, evenings can be cool, and rain is frequent. A warm coat is recommended for winter visits.
Humidity in Aachen is generally moderate, but can feel higher in summer and autumn. Winters are damp, which can make cold temperatures feel more intense.
Aachen is least crowded in winter (November–February) and early spring. These periods offer quieter streets and attractions, but weather may be colder and less suitable for outdoor sightseeing.
The warmest month, with the highest average maximum temperature, is August (73 °F). The month with the lowest average maximum temperature is January (40 °F). Overall, the average maximum temperature over the whole year is 56.7 °F.
The month with the highest average minimum temperature is August (56.9 °F). The coldest month, with the lowest average minimum temperature, is January (32.4 °F). Overall, the average minimum temperature over the whole year is 43.9 °F.
The wettest month, with the highest amount of precipitation, is June (2.2 inch). The driest month, with the least amount of precipitation, is April (1 inch). Over the whole year there are 20.1 inch of rainfall on average.
The month with the most days of rain is July (19.5 days). The month with the fewest days of rain is February (12.1 days). Over the whole year there are 185.6 days of rain on average.
The month with the most snowfall is February (2.1 inch). The months with the least snowfall are April, May, June, July, August, September and October (0 inch). Over the whole year there are 6.2 inch of snowfall on average.
The month with the most days of snowfall is January (6 days). The months with the fewest days of snowfall are July, August, September and October (0 days). Over the whole year there are 20.3 days of snowfall on average.
The month with the highest average relative humidity is December (87.2 %). The month with the lowest average relative humidity is August (74.3 %). The overall average relative humidity over the whole year is 80.9 %.
The windiest month, with the highest average wind speed, is December (10.9 mph). The calmest month, with the lowest average wind speed, is August (6.7 mph). The overall average wind speed over the whole year is 8.4 mph.
The month with the cloudiest skies, so the highest cloud coverage, is December (61.8 %). The month with the clearest skies, so the lowest cloud coverage, is September (39.7 %). Over the whole year there is an average cloud coverage of 49 %.
The month with the longest days, so the most daylight, is June (Average daylight: 16 h). The month with the shortest days, so the least daylight, is December (Average daylight: 8 h). Over the whole year there are 11.9 h of daylight per day on average.
The month with the most sunshine per day is July (Average sunshine: 9 h). The month with the least sunshine per day is December (Average sunshine: 3.1 h). Over the whole year there are 6.3 h of sunlight per day on average.
The months with the highest average UV index are June, July and August (UV index: 5). The months with the lowest average UV index are January, February, November and December (UV index: 2). Over the whole year the average UV index is 3.2.
