If you're looking for summer vibes, the best time to travel to Basel-Mulhouse is in June, July and August, when the average temperature reaches 22.86 °C, while July, June and August are the 3 sunniest months of the year, with an average of 102.4 hours.
However, if you prefer colder temperatures, make sure you visit Basel-Mulhouse during January, February or December to experience an average of 0.25 °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 Basel-Mulhouse is 6.75 mm, while the months of January, February and March are drier, with an average of 0 mm.