Historical weather data, all-time temperature records, and monthly climate averages for Campbell, CA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5th in Campbell typically feels like a gentle preview of summer, with average highs around 68° and lows near 47°. The date has seen some wild swings over 116 years of records — from a scorching 89° in 1989 to a jarring 26° back in 1895. There's about a 1-in-5 chance of rain today, but snow is essentially off the table.
Campbell's all-time extremes tell the story of a place that's mostly mild but not immune to the occasional gut-punch — 109° in June 2000 on one end, 18° in January 1894 on the other. The wettest single day on record dropped 4.32 inches in September 1918, and the town's snowiest day on record managed just one inch in December 1932.
Campbell runs warmest in mid-July, when average highs peak around 82°, and coolest in early January at 57° — a remarkably narrow spread that makes it a year-round destination. If you're dodging rain, aim for summer; late January into early February is the wettest stretch, averaging nearly 0.8 inches per week. Spring and fall offer that sweet spot of mild temperatures without the summer heat.