If you’re looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Scarborough: The hottest months are usually September and October, with an average temperature of 28°C, while the coldest months are February and January, with an average of 27°C. The rainiest months in Scarborough are November, July, October and August, with each month seeing an average of 209 mm of rainfall.