Clothing/Shoes/Weather Gear: The weather is so random in Aachen. One day it is nice sunny and warm, the next maybe be cold and rainy. Some days you'll experience that all in the same day. I dressed in layers and found it was the easiest.
Rainy season: There is no special rainy season
Avg. Temp. in Spring: max.: 11 – 20°C ( 51 - 68°F ); min: 4 - 10°C ( 39 - 50°F )
Avg. Temp. in Summer: max.: 21 – 24°C ( 70 - 75°F ); min: 12 - 14°C ( 52 - 57°F )
Avg. Temp. in Autumn: max.: 8 – 20°C ( 47 - 68°F); min: 4 - 12°C ( 39 – 52°F )
Avg. Temp. in Winter: max.: 6 – 9°C ( 43 - 49°F); min: 3 - 4°C ( 38 - 39°F )
Clothing/Shoes/Weather Gear: Bring an umbrella. It rains a lot here, but we lucked out and had a sunny week. One clerk said it was "Aachen's best weather in two years." Also, pack washcloths! Our hotel didn't have any, and the staff didn't understand what we wanted.
Clothing/Shoes/Weather Gear: You should be aware of the fact that it´s pretty rainy here in Aachen, especially in fall, so pack an umbrella or a rain coat.