Other facts from our historical weather data: Which months have the greatest rainfall in San Alfonso? Most rainfall (rainy season) is seen in June and July. Which is the warmest month in San Alfonso? January has an average maximum temperature of 20°C (68°F) and is the warmest month of the year. Which is the coldest month in San Alfonso? The coldest month is July with an average maximum temperature of 2°C (36°F). Which is the wettest month in San Alfonso? June tops the wettest month list with 211mm (8.3 in) of rainfall. Which is the driest month in San Alfonso? March is the driest month with 25mm (1 in) of precipitation. Which is the sunniest month in San Alfonso? January is the sunniest month with an average of 365 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.