Measurements:
°C
°F
Santa Catalina Island
42°F
W 2 mph
Feels like: 40°F
Precip: 0%
World Resorts USA Santa Catalina Island Weather

Santa Catalina Island Sea Water Temperature

Current Sea Water Temperature:
+62.2°F
Maximum Sea Water Temperature in February: 64.2°F
Minimum Sea Water Temperature in February: 56.4°F
Average water temperature in February: 60.0°F

Sea Water Temperature for the Last 10 Days:

February 21 62.2°F February 16 63.4°F
February 20 62.2°F February 15 63.6°F
February 19 62.6°F February 14 63.8°F
February 18 63.0°F February 13 63.8°F
February 17 63.0°F February 12 64.2°F

When is the Warmest Sea for Santa Catalina Island?

According to our data for the last three years for Santa Catalina Island the highest average sea water temperature was in August, September and July.

Average Water Temperature by Month, °F

Sea Water Temperature in August

Select Year: 2025 2024 2023

The average sea surface temperature in August 2025 for Santa Catalina Island was 71.9°F. The maximum and minimum values were 70.2°F and 74.2°F respectively.

Sea Water Temperature in September

Select Year: 2025 2024 2023

The average sea surface temperature in September 2025 for Santa Catalina Island was 72.9°F. The maximum and minimum values were 71.2°F and 74.4°F respectively.

Sea Water Temperature in July

Select Year: 2025 2024 2023

The average sea surface temperature in July 2025 for Santa Catalina Island was 70.0°F. The maximum and minimum values were 67.0°F and 71.2°F respectively.

Best Time to Visit Santa Catalina Island
The most sunny months:
August 24 days
July 23 days
September 21 days
The most warm months:
August 77.9 °F
September 77.4 °F
July 75.9 °F
Warmest sea temperature:
August 72.7 °F
September 72.6 °F
July 70.7 °F
The most cold months:
March 62.3 °F
December 63.2 °F
January 63.7 °F
The most rainy months:
January 2 days
December 2 days
February 1 day
The most windy months:
March 9 mph
April 7 mph
February 7 mph

Santa Catalina Island on the Weather Map

USA Resorts:
NAME
Chicago +28
Hawaii +72
Honolulu +72
Houston +74
Las Vegas +34
Los Angeles +40
Maui +66
Miami +74
Miami Beach +78
New York +38
San Diego +44
San Francisco +42
Sarasota +68
Tampa +70
Washington +38
24 Hours Weather Forecast
Santa Catalina Island
Local time: 05:20
21 feb, saturday
0600 42°F
W
2 mph
0900 48°F
S
3 mph
1200 56°F
S
6 mph
1500 58°F
E
6 mph
1800 60°F
E
9 mph
2100 60°F
SE
9 mph
22 feb, sunday
0000 58°F
SE
5 mph
0300 58°F
SE
12 mph