Historical weather data, all-time temperature records, and monthly climate averages for Sonoma, CA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Sonoma typically delivers a mild spring day with highs around 70° and lows near 42°. The date has seen its share of swings, though — from a balmy 88° back in 1960 to a freezing 32° low in 1969. There's a 1-in-5 chance of rain today, but snow is off the table entirely.
Sonoma plays for keeps when the weather gets extreme — the valley has baked to 116° in July and plunged to 13° in December, a 103-degree spread that speaks to its inland Mediterranean character. The wettest single day on record dumped 6.75 inches in January 1982, and the town has seen snow, though just barely — a lone inch back in 1907.
Sonoma runs warm and dry from June through September, peaking in late July when average highs hit 89°. Winter is mild but wet, with February the soggiest stretch of the year and highs hovering in the upper 50s to low 60s in January and December. If you're chasing the sweet spot, May and October offer warmth without the summer heat.