Historical weather data, all-time temperature records, and monthly climate averages for Fountain Valley, CA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5th in Fountain Valley is a mild, dry day by historical standards — expect a high around 72° and a low near 49°. There's only a 16% chance of rain, though the date has seen some wild swings: a scorching 104° in 1989 and a near-freezing 34° back in 1945.
Fountain Valley's all-time records reveal a place that can get surprisingly extreme for Southern California. The mercury has soared as high as 114° (July 6, 2018) and dipped to 16° (January 12, 1989), and a single February day in 1927 dumped nearly 5 inches of rain.
Fountain Valley lives up to the SoCal stereotype — monthly highs barely budge, ranging from a 'cool' 68° in early January to a peak of 86° in late August and early September. If you're chasing warmth, late summer is your window; if you want to dodge rain, avoid early February, the wettest stretch of the year.