If you’re looking forward to lots of outings with your partner, check out these details about year-round temperatures in Si Rusa: The hottest months are usually March and April with an average temp of 82°F, while the coldest months are January and February with an average of 81°F. The rainiest months in Si Rusa are November, December, October, and May, with each month seeing an average of 11 inches of rainfall.