If you’re hoping to get lost in the rain on your romantic getaway, take a look at these details about year-round temperatures in Geneva: The hottest months are usually July and August, with an average temperature of 21°C, while the coldest months are January and February, with an average of -2°C. The snowiest months in Geneva are January, November, February and October, with each month seeing an average of 17 cm of snowfall.