Aachen's weather is Atlantic-influenced and often unpredictable, known for its "Schmuddelwetter" (drizzly weather). An hourly forecast is crucial for planning your day between sightseeing at the cathedral and relaxing at the Carolus Thermen spa without being caught in the rain.
Mornings are often cool and cloudy, with a high chance of drizzle. A waterproof jacket is almost always a good idea for the commute to work or university. The hourly forecast shows whether the clouds might clear for a sunny lunch break.
The weather remains changeable in the afternoon. Even when the sun is shining, a shower can move in quickly. Temperatures are usually moderate. Checking the hourly forecast is advisable before planning a long walk through the old town.
Evenings cool down noticeably and humidity rises. A warm sweater or jacket is essential for an evening outdoors, for example at one of the many cozy restaurants.