There is no special rainy season
Avg. Temp. in Spring: max.: 10 – 19°C ( 50 - 66°F ); min: 2 - 9°C ( 36 - 49°F )
Avg. Temp. in Summer: max.: 20 – 24°C ( 68 - 74°F ); min: 11 - 14°C ( 51 - 57°F )
Avg. Temp. in Autumn: max.: 8 – 20°C ( 47 - 68°F); min: 2 - 11°C ( 36 – 51°F )
Avg. Temp. in Winter: max.: 4 – 5°C ( 39 - 41°F); min: -1 - 1°C ( 30 - 34°F )
Weather in Germany can be from cold to sunny or rainy. You never know. We have a lot of rain. So do not forget your pullover and raincoat. Koblenz has a nice weather, the Rhinevalley often is a bit warmer than the mountains around.
Toiletries and Medical Supplies: You can get anything in Koblenz.
Camping/Beach/Outdoor Gear: There is a camping side in Koblenz.
Luggage and bags:
A comfortable backpack is useful...especially if you have to do a lot of walking with it... A daypack would be a good idea for your day trips from your base...
Clothing/Shoes/Weather Gear: Take some warm clothes if you go in the autumn...it gets cold and a rain jacket would also come in handy...