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 San Pablo: The hottest months are usually May and April, with an average temperature of 27°C, while the coldest months are January and February, with an average of 25°C. The rainiest months in San Pablo are July, September, June and August, with each month seeing an average of 429 mm of rainfall.