If you’re hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Geyzing: The hottest months are usually June and August with an average temp of 66°F, while the coldest months are January and December with an average of 51°F. The rainiest months in Geyzing are July, June, August, and May, with each month seeing an average of 37 inches of rainfall.