If you're looking for summer vibes, the best time to travel to Koblenz is in July, June and August, when the average temperature reaches 20.87 °C, while July, August and June are the 3 sunniest months of the year, with an average of 84.48 hours.
If you prefer colder temperatures, however, make sure you visit Koblenz during the months of January, February and December to experience an average of -0.37 °C.
For those who don't care too much about temperatures, but want to avoid getting wet in the rain, it's important to avoid travelling during January, February and March, when the average precipitation in Koblenz is 4.5 mm, while the months of January, February and March are drier, with an average of 0 mm.