Other facts from our historical weather data: When is summer in Puerto del Rosario?The hottest season / summer takes place in July, August, September and October. Which is the warmest month in Puerto del Rosario? September has an average maximum temperature of 26°C (79°F) and is the warmest month of the year. Which is the coldest month in Puerto del Rosario? The coldest month is February with an average maximum temperature of 20°C (68°F). Which is the wettest month in Puerto del Rosario? December tops the wettest month list with 20mm (0.8 in) of rainfall. Which is the driest month in Puerto del Rosario? July is the driest month with 2mm (0.1 in) of precipitation. Which is the sunniest month in Puerto del Rosario? July is the sunniest month with an average of 297 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.