Historical weather data, all-time temperature records, and monthly climate averages for Perris, CA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Perris typically feels like proper spring, with an average high of 73° and a low of 43°. The date has seen some wild swings though — as warm as 91° back in 1961 and as cold as 30° as recently as 2023. Rain is unlikely, with just an 11% historical chance of any precipitation.
Perris earns its inland Southern California credentials with an all-time high of 116°, hit on September 6, 2020 — a brutal reminder of what late-summer heat waves can deliver here. On the other end, the thermometer once plunged to 17° in December 1968, and the valley has even seen 3 inches of snow in a single day back in January 1949.
Perris runs warm from June through October, peaking in late July and August with average highs around 93–94°. If you're looking to avoid the heat, January is your window, with highs hovering in the mid-60s. Rain is scarce year-round but concentrates in late January, averaging less than half an inch even in the wettest week of the year.