Historical weather data, all-time temperature records, and monthly climate averages for Claremont, CA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
July 22nd is a notable date in Claremont's weather history — it's the anniversary of the city's all-time hottest day, when temperatures hit 109° in 2006. That record still stands after 40 years of data, a reminder of just how intense the Inland Empire heat can get.
Claremont's thermometer has swung hard in both directions over the past four decades, from a brutal 109° in July 2006 down to a frigid 19° in March 1986. That 90-degree range tells the story of a city that sits in the crosshairs of both desert heat and the occasional hard freeze.
Summers are long and legitimately hot here — highs average 88-89° through July and August, with the warmest stretch landing at the end of July. Winter is mild but real, with December and January highs settling in the low 60s and what little rain the area gets concentrated in early January.