San Clemente Island - Northwest Harbor Weather Forecast
- 56
- 64
Patchy Fog
- 57
- 64
Patchy Fog
- 58
- 66
Mostly Sunny
- 59
- 67
Mostly Sunny
- 58
- 67
Mostly Sunny
- 58
- 66
Partly Sunny
Today 6 Dec Catalina and Santa Barbara Islands
Sunny. Highs in the lower to mid 60s.
Tonight 6 Dec Catalina and Santa Barbara Islands
Clear. Lows in the upper 40s to mid 50s.
San Clemente Island - Northwest Harbor Temperature Statistics
December Temperature
San Clemente Island NALF (0.6 miles)
Lowest 2 December, 2025
50 °FAverage December
60 °FHighest 1 December, 2025
64 °F
Climate (2020–Present)
San Clemente Island NALF (0.6 miles)
Average Low 2020–2025
56.8 °FAverage 2020–2025
61.3 °FAverage High 2020–2025
66 °F