If you’re hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Ocosingo: The hottest months are usually April and May with an average temp of 65°F, while the coldest months are January and December with an average of 60°F. The rainiest months in Ocosingo are June, September, August, and July, with each month seeing an average of 19 inches of rainfall.