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 Oslob: The hottest months are usually May and April, with an average temperature of 27°C, while the coldest months are February and January, with an average of 26°C. The rainiest months in Oslob are July, October, June and September, with each month seeing an average of 270 mm of rainfall.