Historical weather data, all-time temperature records, and monthly climate averages for Fallbrook, CA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Fallbrook runs mild, with an average high of 70° and a low around 46°. But don't let the averages fool you — this date has seen wild swings, from a scorching 102° in 1989 to a near-freezing 33° in 1997. Rain is rarely a concern, with only a 7% chance of any precipitation.
Fallbrook plays it warm by most standards, but its extremes tell a spicier story. The mercury has topped out at 110° on September 4, 1988, and bottomed out at a hard freeze of 20° on January 14, 2007 — a brutal reminder that even avocado country isn't immune to winter. The wettest single day on record dropped 3.62 inches on March 5, 1995.
Fallbrook's climate is remarkably consistent year-round, with average highs ranging from a mild 66° in late December to a warm 84° in late August — a spread of less than 20 degrees. If you're chasing the warmest weather, aim for August through September; if you want to avoid rain, skip February, which is the wettest stretch of the year. Honestly, though, there's rarely a bad time to visit.