Planning for the weather is a good way to make your trip to Jelsa relaxing and enjoyable, especially when you're splurging. The hottest months are usually July and August, with an average temperature of 13°C, while the coldest months are February and January, with an average of 1°C. The rainiest months in Jelsa are December, October, September and August, with each month seeing an average of 267 mm of rainfall.