San Clemente Island, CA Climate

Summary Graph

The summary climate graph for San Clemente Island, CA shows a selection of temperature, rainfall and snow minimum, mean and maximum measures over the course of a year. Click on each of the measures in the key to toggle them on and off.

Graph of average and extreme temperature ranges by day for San Clemente Island, CA.


The warmest month in San Clemente Island Nalf, San Clemente Island, California is August with an average high temperature of 71.6°F. The hottest day on record was September 26 1963 when the temperature hit 102.0°F. During January the overnight temperature drops to an average of 51.4°F with the lowest temperature of 11.1°F being recorded on November 7 1991.

Warmest Days

Warmest Months

Coldest Days

Coldest Months

The warmest days on record are:

26 Sep 1963102°F
29 Sep 200599°F
7 Apr 198997°F
24 Sep 197896.1°F
6 Oct 200596.1°F

The warmest months on average were:

July 200680.8°F
August 200679°F
September 197978.5°F
September 198478.4°F
September 197878.3°F

The coldest days on record are:

7 Nov 199111.1°F
2 Jan 197633.1°F
20 Nov 197537.9°F
4 Mar 197637.9°F
4 Jan 198237.9°F

The coldest months on average were:

December 197846.1°F
January 198247°F
November 199147°F
January 197647.3°F
January 198547.7°F


The wettest month by average rainfall in San Clemente Island, CA is February with an average of 0.5 inches of rain falling on 5 to 6 days.Although in March it typically rains on more days with 0.5 inches falling in 5 to 6 days. The driest month by average rainfall in San Clemente Island, CA is July with an average of 0.0 inches of rain falling on 1 to 2 days. Although in August it typically rains on less days with 0.1 inches falling in 1 to 2 days

Wettest Days

The wettest days on record are:

8 May 19771.1 inches
1 May 19750.6 inches
24 May 19780.6 inches
5 May 19980.2 inches
7 May 19760.2 inches

Wettest Months

The wettest months on record are:

November 19857.9 inches
February 19804.7 inches
January 19784.4 inches
March 19783.9 inches
February 19833.7 inches

Driest Months

The driest months on record are:

July 19430 inches
April 19450 inches
May 19450 inches
June 19450 inches
July 19450 inches
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