Historical weather data, all-time temperature records, and monthly climate averages for San Rafael, CA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in San Rafael runs mild — 124 years of data puts the average high at 67° with a low of 43°. There's a 1-in-4 chance of rain, though the date has seen everything from a toasty 85° back in 1957 to a freezing 32° in 1918.
San Rafael's weather has real range: the thermometer has swung from a scorching 112° in July 1913 all the way down to 17° on New Year's Eve 1915. The wettest single day on record dumped 11.56 inches in January 1967 — and the town even saw a rare white Christmas in 1948 with an inch of snow.
Summer is the sweet spot here, with highs in the low-to-mid 80s from July through September and almost no rain. If you're visiting in winter, pack layers — January highs hover around 56° and late December is the wettest stretch of the year, averaging over 2.5 inches in a single week. Spring and fall offer a pleasant middle ground, with April already climbing toward 69°.