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 New Port Richey: The hottest months are usually August and July, with an average temperature of 28°C, while the coldest months are January and February, with an average of 17°C. The rainiest months in New Port Richey are August, July, June and September, with each month seeing an average of 204 mm of rainfall.