Historical weather data, all-time temperature records, and monthly climate averages for San Lorenzo, CA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in San Lorenzo is a mild, late-winter day by the numbers — expect a high around 64° and a low near 49°. There's a one-in-four chance of rain, though the range of what's possible is wide: this date has seen a balmy 83° (1960) and a chilly 39° low (2001).
San Lorenzo has seen some genuine extremes over its 78 years of records — from a scorching 104° in June 1961 to a hard freeze at 25° in January 1949. The Bay Area's famous moderation does slip occasionally: New Year's Eve 2022 brought a remarkable 5.01 inches of rain in a single day, and February 1976 even produced an inch of snow.
San Lorenzo runs cool and steady for most of the year, with highs ranging from a low of 55° in early January to a peak of 74° in late August and early September. Summer arrives gradually and stays mild — nothing like the inland heat — making fall the sweet spot for warm, dry weather. If you're trying to avoid rain, aim for June through October; December is the wettest stretch, averaging over an inch of rain in the final week alone.