If you’re looking forward to lots of outings with your partner, check out these details about year-round temperatures in Dundee Beach: The hottest months are usually November and October with an average temp of 84°F, while the coldest months are July and August with an average of 78°F. The rainiest months in Dundee Beach are January, February, December, and March, with each month seeing an average of 17 inches of rainfall.