Temperature for May
In San Nicolas Island, CA during May the average high temperature is 65.7°F. The hottest day on record was May 5, 1990 when the temperature hit 95.0°F.
Precipitation for May
In May the average monthly rainfall in San Nicolas Island, CA is 0.32 inches with rain usually falling on between 1 and 2 days. 1944 was the driest May with only 0.00 inches of rain falling, and 1977 was the wettest May with 2.03 inches of rain. The wettest single day in May was 13 May 1977 when 0.47 inches of rain fell.
In May there have been some years when thunderstorms have occurred, although there are other years when there hasn't been a thunderstorm in May.