Historical weather data, all-time temperature records, and monthly climate averages for San Clemente, CA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
San Clemente sits in one of Southern California's most enviable climate pockets, where historical data shows remarkably stable conditions year-round. Today's date has seen everything from June gloom to Santa Ana-driven heat spikes over the past three decades of records.
San Clemente's weather is famously mild, but the extremes tell a wilder story — the mercury has climbed as high as 115° (July 6, 2018) and dipped as low as 33° (February 27, 2011). Those outliers are the exception, not the rule, for a city where average highs rarely stray far from the mid-60s to upper 80s.
Summer is the undisputed peak, with late August through early September delivering average highs of 89° — the warmest stretch of the year. Winters are genuinely mild, with February highs averaging 68° and January historically being the wettest month, though rainfall totals remain modest. If you're chasing warmth, aim for August; if you want the whole coast to yourself, February still offers shirt-sleeve afternoons.