If you’re looking forward to lots of outings with your partner, check out these details about year-round temperatures in Velankanni: The hottest months are usually May and June with an average temp of 86°F, while the coldest months are January and February with an average of 79°F. The rainiest months in Velankanni are November, December, October, and August, with each month seeing an average of 11 inches of rainfall.