Other facts from our historical weather data: Which is the hottest month in Jazan? July has an average maximum temperature of 35°C (95°F) and is the hottest month of the year. Which is the coolest month in Jazan? The coolest month is January with an average maximum temperature of 29°C (84°F). Which is the wettest month in Jazan? August tops the wettest month list with 23mm (0.9 in) of rainfall. Which is the driest month in Jazan? June is the driest month with 2mm (0.1 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.