Weather will likely play an important role when you plan your trip to San Gabriel, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually May and April, with an average temperature of 21°C, while the coldest months are January and February, with an average of 17°C. The rainiest months in San Gabriel are August, July, September and June, with each month seeing an average of 360 mm of rainfall.