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Monthly climate in Walnut Creek, Arizona, United States

Last updated: March 2, 2024

Under the Köppen–Geiger climate classification Walnut Creek features a cold desert climate (BWk). Temperatures typically range between 8 °C (47 °F) and 32 °C (89 °F) through the year, but rarely can drop to -5 °C (23 °F) or can rise to as high as 44 °C (112 °F). The average annual precipitation amounts to about 237 mm (9.3 inches) and receives 35 rainy days on the 1 mm (0.04 inches) threshold annually. Walnut Creek enjoys an average of 3653 hours of sunshine throughout the year, and daylight varies from 9 hours 48 minutes to 14 hours 28 minutes per day.

Monthly average temperatures in Walnut Creek, Arizona, United States §

The warmest months in Walnut Creek are June, July and August, with daily mean temperatures ranging from 30 to 32 °C (86 - 89 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 8 to 10 °C (47 - 49 °F) throughout the day. On average each year, Walnut Creek experiences 161 days above 25 °C (77.0 °F) and 13 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Walnut Creek, Arizona, 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 21°C
(71°F)		 24°C
(75°F)		 30°C
(86°F)		 35°C
(95°F)		 39°C
(102°F)		 44°C
(112°F)		 43°C
(109°F)		 43°C
(109°F)		 42°C
(109°F)		 36°C
(98°F)		 29°C
(85°F)		 23°C
(74°F)
Mean maximum 18°C
(65°F)		 21°C
(71°F)		 27°C
(80°F)		 32°C
(90°F)		 35°C
(95°F)		 39°C
(102°F)		 42°C
(107°F)		 41°C
(106°F)		 40°C
(104°F)		 32°C
(90°F)		 26°C
(80°F)		 20°C
(68°F)
Average high 14°C
(57°F)		 15°C
(60°F)		 19°C
(67°F)		 25°C
(77°F)		 29°C
(84°F)		 35°C
(96°F)		 37°C
(99°F)		 37°C
(99°F)		 33°C
(92°F)		 26°C
(78°F)		 20°C
(69°F)		 14°C
(57°F)
Daily mean 8°C
(47°F)		 10°C
(49°F)		 13°C
(56°F)		 19°C
(67°F)		 23°C
(74°F)		 30°C
(86°F)		 32°C
(89°F)		 32°C
(89°F)		 27°C
(81°F)		 19°C
(67°F)		 14°C
(57°F)		 8°C
(47°F)
Average low 3°C
(38°F)		 4°C
(40°F)		 8°C
(46°F)		 13°C
(55°F)		 16°C
(61°F)		 23°C
(73°F)		 26°C
(79°F)		 25°C
(78°F)		 21°C
(70°F)		 13°C
(55°F)		 8°C
(47°F)		 3°C
(38°F)
Mean minimum -3°C
(28°F)		 -3°C
(28°F)		 1°C
(34°F)		 6°C
(43°F)		 9°C
(49°F)		 16°C
(61°F)		 21°C
(70°F)		 21°C
(70°F)		 14°C
(58°F)		 4°C
(40°F)		 1°C
(33°F)		 -2°C
(29°F)
Minimum -5°C
(24°F)		 -5°C
(23°F)		 -1°C
(30°F)		 3°C
(38°F)		 7°C
(45°F)		 13°C
(56°F)		 19°C
(67°F)		 21°C
(69°F)		 10°C
(50°F)		 -0°C
(32°F)		 -0°C
(31°F)		 -2°C
(28°F)

Compare climate in Walnut Creek with other places

Compare temperature, precipitation, sunshine, UV index in Walnut Creek, Arizona, United States with other places around the world.

Monthly average precipitation in Walnut Creek, Arizona, United States §

Walnut Creek usually has the most precipitation in February, March and July, with an average of 5 rainy days and 32 mm (1.3 inches) of precipitation per month. The driest months in Walnut Creek are April, May and June. On average, 5 mm (0.2 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Walnut Creek, Arizona, 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) 28 (1.1) 29 (1.1) 36 (1.4) 8 (0.3) 7 (0.3) 1 (0.1) 32 (1.3) 14 (0.6) 15 (0.6) 20 (0.8) 26 (1.0) 21 (0.8)
Average precipitation days (≥ 1 mm) 4 4 6 1 1 0 6 4 2 3 1 3

Monthly sunshine hours in Walnut Creek, Arizona, United States §

The sunniest months in Walnut Creek are May, June and July, when the sun shines an average of 12 hours 15 minutes a day. Least sunny months in Walnut Creek: January, February and December receive an average of 7 hours 17 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Walnut Creek, Arizona, 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 187 241 296 326 373 379 375 359 322 296 259 233
Mean daily daylight hours 10h 4m 10h 55m 11h 59m 13h 6m 14h 1m 14h 28m 14h 13m 13h 24m 12h 20m 11h 14m 10h 17m 9h 48m

Solar UV radiation in Walnut Creek, Arizona, United States §

Walnut Creek experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 11 - 12, which corresponds to the 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 Walnut Creek UV Index data.

Average daily maximum UV levels by month for Walnut Creek, Arizona, 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 11 12 12 11 10 7 5 4

Detailed Monthly Weather Insights for Walnut Creek, Arizona, United States

Discover in-depth weather details for every month in Walnut Creek. Click through the links below for comprehensive overviews of temperature trends, precipitation levels, sunshine hours, and solar UV radiation specifics. Whether planning a visit or simply curious about Walnut Creek's climate nuances, these monthly breakdowns provide the information you need for an informed understanding of what to expect throughout the year.

Each link leads to a detailed account of the typical weather conditions for that month, providing both locals and tourists with vital information to plan their daily activities, wardrobe, and travel itineraries accordingly.