Other facts from our historical weather data: Which is the warmest month in Valle Gran Rey? September has an average maximum temperature of 25°C (77°F) and is the warmest month of the year. Which is the coldest month in Valle Gran Rey? The coldest month is February with an average maximum temperature of 20°C (68°F). Which is the wettest month in Valle Gran Rey? December tops the wettest month list with 32mm (1.3 in) of rainfall. Which is the driest month in Valle Gran Rey? July is the driest month with 0mm (0 in) of precipitation. Which is the sunniest month in Valle Gran Rey? May is the sunniest month with an average of 253 hours of sunshine. 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.