Planning for the weather is an important factor for making your trip to Santa Catalina a success, especially when you're splurging. 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.