Visiting local bars in Jacksonville is more fun when you know what the weather holds. These rainfall averages and temperatures can help you decide the best time for bar-hopping. The hottest months are usually July and August, with an average temperature of 25°C, while the coldest months are January and February, with an average of 10°C. The rainiest months in Jacksonville are August, September, July and June, with each month seeing an average of 182 mm of rainfall.