Historical weather data, all-time temperature records, and monthly climate averages for Palo Alto, CA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5th in Palo Alto runs mild, with highs averaging 66° and lows around 48° across 72 years of records. There's a 22% chance of rain today — not unlikely, but not a sure thing. The date has seen some wild swings though: a scorching 89° in 1989 and a freezing 32° back in 1945.
Palo Alto's weather has a wider range than its reputation for perfect Silicon Valley skies might suggest. The all-time high hit 106° on June 14, 2000, while the coldest recorded temperature plunged to 21° in January 1949. Snow is genuinely rare here, but 1.8 inches fell on January 21, 1962 — still the snowiest day on record.
Late summer is peak warmth in Palo Alto, with the week of August 27–September 2 averaging a high of 77° — slightly warmer than July thanks to the bay area's characteristic late-season heat. Winter stays mild, with January highs hovering around 57–58°. If you're trying to dodge rain, avoid mid-February, which is statistically the wettest stretch of the year.