Riverside County Climate
Riverside County, California
Avg Annual Temp
69.5°F
Annual Precip
7.9"
Annual Snowfall
2.1"
Extreme Heat Days
139.82777777777778
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Riverside County Weather
A blistering desert pace for Riverside
Riverside County averages a warm 69.5°F annually, significantly exceeding the national median temperature. With only 7.9 inches of rain, the climate remains much drier and hotter than most of the United States.
Riverside leads the state in heat
The county's 69.5°F annual average sits well above California's state average of 58.7°F. This makes it one of the warmest regions in the state, driven by its vast inland desert landscapes.
Hotter and drier than its neighbors
Riverside is notably warmer than San Bernardino County, which averages 64.8°F. It also receives about 6 inches less annual rainfall than neighboring San Diego County, emphasizing its arid inland profile.
Extreme summers and mild winters
The county faces an intense 140 days per year where temperatures exceed 90°F. While July averages 86.0°F, winters remain mild with a January average of 55.1°F and negligible snowfall of 2.1 inches.
Prioritize cooling and desert readiness
Robust HVAC systems are a necessity here to manage the frequent triple-digit summer days. Residents should also plan for high water conservation given the low 7.9-inch annual precipitation.
Frequently Asked Questions
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Data source: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020.
Climate normals are 30-year averages of weather variables computed from 1991 to 2020. Station data is aggregated to county level using spatial averaging. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.