Santa Catalina Island sea water temperature

Current sea water temperature:

+74.1°F


Minimum sea water temperature in September:	76.5°F
Maximum sea water temperature in September:	66.7°F
Average sea water temperature in September:	70.6°F

more information

14 days
forecast

Santa Catalina Island

monthly
weather

Santa Catalina Island

September 13	74.1°F	September 8	73.2°F
September 12	74.7°F	September 7	73.0°F
September 11	74.8°F	September 6	73.0°F
September 10	74.1°F	September 5	72.9°F
September 9	73.2°F	September 4	73.0°F

January
February
March
April

May
June
July
August

September
October
November
December

When is the warmest sea in Santa Catalina Island?

Based on the data about daily sea water temperature for the last three years the warmest sea in Santa Catalina Island was noticed in August, September and July.

Show year:

2026

2025

2024

The average sea water temperature in August of 2026 was 73.7°F. The highest and lowest sea temperatures during the month were 76.3°F and 72.3°F.

Show year:

2025

2024

2023

The average sea water temperature in September of 2025 was 70.6°F. The highest and lowest sea temperatures during the month were 72.0°F and 69.1°F.

Show year:

2026

2025

2024

The average sea water temperature in July of 2026 was 69.6°F. The highest and lowest sea temperatures during the month were 73.0°F and 66.7°F.

current
weather

Santa Catalina Island

weather in
September

Santa Catalina Island