Weather is probably a major factor when you plan your trip to Santa Catalina, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually March and April, with an average temperature of 27°C, while the coldest months are January and December, with an average of 25°C. The rainiest months in Santa Catalina are October, August, June and November, with each month seeing an average of 447 mm of rainfall.