The hottest month in Santa Catalina is August when the average maximum temperature is 27°, average temperature is 24° and average minimum temperature is 21°.
The coolest month in Santa Catalina is February when the average maximum temperature is 19°, average temperature is 17° and average minimum temperature is 14°.
The longest days in Santa Catalina are in June, with an average of 13.9 hours of daylight per day. December has the shortest days with an average of 10.4 hours of daylight per day.
The sunniest days in Santa Catalina are in June which has the most hours of sunshine per day with an average of 9.9 hours of sunshine per day, making it a sunny month with few clouds. December has the least sunshine with an average of 7 hours of sunshine per day, making it a quite sunny month with some cloud cover.
The ultraviolet index is the highest in July when it reaches 12.2 and lowest in December when it reaches 4.2.
An ultraviolet index reading above 11 indicates an extreme risk of harm from unprotected sun exposure. Unprotected skin risks burning in less than 10 minutes. Take all precautions because unprotected skin and eyes can burn in minutes. Tanning will be safest before 10am and after 4pm but only with a good application of sun screen. For those with sensitive skin stay in the shade and wear protective clothing, a wide-brimmed hat, and UV-blocking sunglasses. Generously apply broad spectrum SPF 30+ sunscreen every 2 hours, even on cloudy days. Watch out for relections from water that may increase ultraviolet exposure.
The warmest sea water temperatures in Santa Catalina are found in September when they peak at 23° and lowest in February when they dip to 20°.
The sea is best for swimming between June and December when the temperature is above 21° which is comfortable for swimming though some may prefer warmer water.
The most humid month in Santa Catalina is August with a dew point (an indicator of humidity) of 19° which is somewhat uncomfortable for most people in cities but fine on a beach.
The least humid month in Santa Catalina is February with a dew point of 11° which is very comfortable.
The most windy month in Santa Catalina is April when the average maximum windspeed is 20kmh and the average wind speed is 11kmh.
The least windy month in Santa Catalina is August when the average maximum windspeed is 17kmh and the average wind speed is 8kmh.