Other facts from our historical weather data: Which is the hottest month in Nagua? September has an average maximum temperature of 32°C (90°F) and is the hottest month of the year. Which is the coolest month in Nagua? The coolest month is January with an average maximum temperature of 28°C (82°F). Which is the wettest month in Nagua? May tops the wettest month list with 165mm (6.5 in) of rainfall. Which is the driest month in Nagua? February is the driest month with 72mm (2.8 in) of precipitation. No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.