Historical weather data, all-time temperature records, and monthly climate averages for Millbrae, CA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5 in Millbrae typically lands right in that comfortable spring sweet spot — a 63° high, 48° low, and just a 1-in-4 chance of rain. The date has swung wildly in the past, though, from a chilly 39° in 1975 to a shirt-sleeve 84° back in 1989.
Millbrae's all-time records tell the story of a mild coastal city that occasionally gets pushed to its limits. The thermometer has touched 105° (June 2000) and plunged to 24° (December 1972), and a single January day in 1982 dumped 5.59 inches of rain — still the record.
Millbrae stays mild year-round, with highs running from 55° in early January to a peak of 74° in late August and early September — the sweet spot for a visit. Rain is almost exclusively a winter affair, with late December the wettest stretch at over an inch per week on average.