Weather will likely play an important role when you plan your trip to San Andres, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually October and November, with an average temperature of 11°C, while the coldest months are August and September, with an average of 10°C. The rainiest months in San Andres are April, March, February and January, with each month seeing an average of 566 mm of rainfall.