Historical weather data, all-time temperature records, and monthly climate averages for San Carlos, CA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in San Carlos typically delivers a mild spring day, with average highs of 69° and lows of 45°. There's a 1-in-5 chance of rain, though the date has seen everything from a balmy 86° (1960) to a bone-chilling 36° low back in 1945.
San Carlos has seen some genuine extremes over its 120 years of records — from a scorching 110° in July 1972 to a hard freeze at 16° in January 1949. Even snow has made a rare appearance, with 0.7" falling on January 2, 2002.
San Carlos is a classic Bay Area gem: warm and dry from June through October, with peak highs averaging 82° in early July. Winter brings the bulk of the rain, especially late December when weekly totals can top an inch. If you're avoiding wet weather, aim for May through September.