Historical weather data, all-time temperature records, and monthly climate averages for Los Altos, CA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5 in Los Altos runs mild by historical measure — a 66° high and 48° low is the norm across 72 years of records. That said, the date has swung hard in both directions: a scorching 89° in 1989 and a freezing 32° back in 1945. There's about a 1-in-5 chance of rain today, but snow is essentially off the table.
Los Altos has seen it all — from a brutal 106° on June 14, 2000, to a teeth-chattering 21° on January 5, 1949. The wettest single day on record dropped 3.36 inches on December 11, 2014, and the town even logged 1.8 inches of snow on January 21, 1962, a rarity for the South Bay.
Los Altos is at its warmest in late August through early September, when average highs peak around 77° — making that window the sweet spot for comfortable outdoor time. Winters are mild but damp, with January highs averaging just 57° and mid-February being the wettest stretch of the year. If you're dodging rain, aim for summer; if you're dodging heat, spring and fall are your friends.