Visiting local bars in Jacob is more fun when you know what the weather holds. These temperatures and rainfall averages can help you decide the best time for bar hopping. The hottest months are usually September and October with an average temp of 83°F, while the coldest months are February and March with an average of 80°F. The rainiest months in Jacob are October, November, June, and July, with each month seeing an average of 12 inches of rainfall.