Riverside, CA Weather

Riverside experiences a semi-arid climate with hot, dry summers and mild, relatively wet winters. Normal monthly mean temperatures range from 54.8 °F (12.7 °C) in December to 79.8 °F (26.6 °C) in August. On average, temperatures reach the freezing mark and 100 °F (38 °C) on 3.5 and 21.6 days annually, respectively. Record temperatures range from 18 °F (−8 °C) on January 15, 1911, up to 118 °F (48 °C) on July 17, 1925, June 16, 1917, and July 6, 2018. On average, Riverside receives 9.39 in (239 mm) of precipitation annually, with measurable precipitation occurring on 35 days, with almost all of it between November and April, with February the wettest month.