Historical weather data, all-time temperature records, and monthly climate averages for Grover Beach, CA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Grover Beach has swung wildly — from a scorching 94° back in 1961 to a freezing 32° in 1999. Today's average sits at a mild 68° high and 45° low, with only an 18% chance you'll see any rain. Expect a pleasant spring day by the numbers.
Grover Beach has seen genuine extremes despite its coastal reputation — 113° in September 2020 is a brutal outlier, while a 17° freeze hit on December 23, 1990. The wettest single day on record dumped 6.05 inches on January 9, 2023, a reminder that California's atmospheric rivers play no games here.
Grover Beach runs cool and remarkably steady year-round, with monthly highs ranging only from 63° in early January to 80° in late August. If you're chasing warmth, late summer through early fall is your window. Winter is the wet season, peaking in the final week of December with an average of 1.54 inches.