If you’re hoping to get lost in the rain on your romantic getaway, take a look at these details about year-round temperatures in Jaffna: The hottest months are usually April and May, with an average temperature of 29°C, while the coldest months are January and February, with an average of 27°C. The rainiest months in Jaffna are November, December, October and September, with each month seeing an average of 277 mm of rainfall.