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Monthly climate in Riverside, California, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Riverside features a hot-summer Mediterranean climate (Csa).Temperatures typically range between 12 °C (54 °F) and 26 °C (80 °F) through the year, but rarely can drop to -1 °C (31 °F) or can rise to as high as 46 °C (115 °F).The average annual precipitation amounts to about 473 mm (18.6 inches) and receives 43 rainy days on the 1 mm (0.04 inches) threshold annually.Riverside enjoys an average of 3575 hours of sunshine throughout the year, and daylight varies from 9 hours 55 minutes to 14 hours 21 minutes per day.

Monthly average temperatures in Riverside, California, United States §

The warmest months in Riverside are July, August and September, with daily mean temperatures ranging from 24 to 26 °C (76 - 80 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 12 to 12 °C (54 - 54 °F) throughout the day. On average each year, Riverside experiences 168 days above 25 °C (77.0 °F) and 0 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Riverside, California, United States.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 30°C
(85°F)		 29°C
(85°F)		 30°C
(87°F)		 35°C
(96°F)		 35°C
(95°F)		 41°C
(105°F)		 45°C
(112°F)		 41°C
(107°F)		 46°C
(115°F)		 39°C
(103°F)		 33°C
(92°F)		 29°C
(84°F)
Mean maximum 25°C
(78°F)		 26°C
(78°F)		 28°C
(83°F)		 33°C
(92°F)		 33°C
(91°F)		 36°C
(97°F)		 40°C
(104°F)		 39°C
(103°F)		 40°C
(105°F)		 36°C
(96°F)		 32°C
(90°F)		 26°C
(79°F)
Average high 18°C
(65°F)		 19°C
(66°F)		 20°C
(68°F)		 24°C
(75°F)		 25°C
(77°F)		 30°C
(86°F)		 34°C
(93°F)		 34°C
(94°F)		 32°C
(90°F)		 28°C
(83°F)		 24°C
(75°F)		 18°C
(66°F)
Daily mean 12°C
(54°F)		 12°C
(54°F)		 14°C
(57°F)		 17°C
(63°F)		 18°C
(66°F)		 23°C
(73°F)		 26°C
(80°F)		 26°C
(80°F)		 24°C
(76°F)		 20°C
(69°F)		 16°C
(61°F)		 12°C
(54°F)
Average low 7°C
(44°F)		 7°C
(44°F)		 8°C
(47°F)		 11°C
(53°F)		 13°C
(56°F)		 16°C
(62°F)		 20°C
(68°F)		 20°C
(69°F)		 18°C
(65°F)		 14°C
(57°F)		 10°C
(50°F)		 6°C
(44°F)
Mean minimum 2°C
(35°F)		 1°C
(34°F)		 3°C
(38°F)		 7°C
(45°F)		 9°C
(48°F)		 12°C
(55°F)		 16°C
(62°F)		 17°C
(62°F)		 14°C
(57°F)		 8°C
(46°F)		 6°C
(42°F)		 1°C
(34°F)
Minimum -0°C
(32°F)		 -1°C
(31°F)		 1°C
(34°F)		 6°C
(42°F)		 6°C
(43°F)		 12°C
(53°F)		 14°C
(58°F)		 16°C
(61°F)		 11°C
(52°F)		 6°C
(44°F)		 3°C
(39°F)		 0°C
(32°F)

Compare climate in Riverside with other places

Compare temperature, precipitation, sunshine, UV index in Riverside, California, United States with other places around the world.

Monthly average precipitation in Riverside, California, United States §

Riverside usually has the most precipitation in January, March and December, with an average of 7 rainy days and 90 mm (3.5 inches) of precipitation per month.The driest months in Riverside are June, July and August. On average, 2 mm (0.1 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Riverside, California, United States.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average precipitation mm (inches) 87 (3.4) 84 (3.3) 95 (3.7) 35 (1.4) 23 (0.9) 3 (0.1) 1 (0.1) 2 (0.1) 5 (0.2) 15 (0.6) 35 (1.4) 87 (3.4)
Average precipitation days (≥ 1 mm) 6 6 11 3 5 0 0 0 1 2 3 6

Monthly sunshine hours in Riverside, California, United States §

The sunniest months in Riverside are June, July and August, when the sun shines an average of 12 hours 7 minutes a day.Least sunny months in Riverside: January, February and December receive an average of 7 hours 1 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Riverside, California, United States.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 185 232 281 318 354 373 380 361 318 293 254 221
Mean daily daylight hours 10h 10m 10h 58m 11h 59m 13h 2m 13h 55m 14h 21m 14h 7m 13h 20m 12h 19m 11h 17m 10h 22m 9h 55m

Solar UV radiation in Riverside, California, United States §

Riverside experiences the highest level of ultraviolet (UV) radiation in April, June and July, when the maximum UV index can reach values of 10 - 12, which corresponds to the Very High / Extreme category of sun exposure.January, November and December are in the Moderate exposure category. In these months, the maximum values of the UV index do not exceed 5. For more detailed information, check out our hourly Riverside UV Index data.

Average daily maximum UV levels by month for Riverside, California, United States.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 4 6 8 10 10 12 11 10 10 7 5 4