Historical weather data, all-time temperature records, and monthly climate averages for Westmont, CA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Westmont is typically mild, with an average high of 67° and a low of 52°. The date has seen some wild swings though — a scorching 99° in 1989 and a chilly 42° low back in 1945. Rain is unlikely, with just a 12% historical chance of any precipitation.
Westmont's weather history spans over 80 years of extremes, from a blistering 110° on September 26, 1963, to a rare freeze at 27° on January 4, 1949. The wettest single day on record dropped 5.6 inches of rain on November 21, 1967 — a reminder that Southern California winters can still pack a punch.
Westmont's climate is remarkably consistent year-round, with monthly average highs ranging only from 65° in January to 76° at the late-summer peak of late August through September. If you're chasing warmth, aim for late summer; if you want to avoid rain, skip February, which averages the wettest week of the year at 0.77 inches. Honestly, though, any month here is pretty agreeable.