If you’re hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Boca Chica: The hottest months are usually March and April with an average temp of 80°F, while the coldest months are December and November with an average of 76°F. The rainiest months in Boca Chica are October, August, November, and July, with each month seeing an average of 25 inches of rainfall.