Other facts from our historical weather data: When is summer in Playa de Santiago?The hottest season / summer takes place in July, August, September and October. Which is the warmest month in Playa de Santiago? August has an average maximum temperature of 25°C (77°F) and is the warmest month of the year. Which is the coldest month in Playa de Santiago? The coldest month is February with an average maximum temperature of 20°C (68°F). Which is the wettest month in Playa de Santiago? December tops the wettest month list with 34mm (1.3 in) of rainfall. Which is the driest month in Playa de Santiago? July is the driest month with 0mm (0 in) of precipitation. Which is the sunniest month in Playa de Santiago? 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.