Weather will likely play an important role when you plan your trip to Gimmelwald, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually August and July, with an average temperature of 9°C, while the coldest months are January and February, with an average of -6°C. The rainiest months in Gimmelwald are August, July, June and May, with each month seeing an average of 200 mm of rainfall.