nomadseason

Monthly climate in Castaic, California, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Castaic features a warm-summer Mediterranean climate (Csb).Temperatures typically range between 10 °C (51 °F) and 26 °C (78 °F) through the year, but rarely can drop to -2 °C (29 °F) or can rise to as high as 43 °C (110 °F).The average annual precipitation amounts to about 333 mm (13.1 inches) and receives 36 rainy days on the 1 mm (0.04 inches) threshold annually.Castaic enjoys an average of 3558 hours of sunshine throughout the year, and daylight varies from 9 hours 52 minutes to 14 hours 24 minutes per day.

Monthly average temperatures in Castaic, California, United States §

The warmest months in Castaic are July, August and September, with daily mean temperatures ranging from 23 to 26 °C (74 - 78 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 10 to 11 °C (51 - 52 °F) throughout the day. On average each year, Castaic experiences 142 days above 25 °C (77.0 °F) and 3 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Castaic, 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 26°C
(79°F)		 26°C
(80°F)		 29°C
(84°F)		 33°C
(91°F)		 34°C
(93°F)		 41°C
(106°F)		 41°C
(106°F)		 41°C
(106°F)		 43°C
(110°F)		 37°C
(99°F)		 29°C
(85°F)		 25°C
(77°F)
Mean maximum 22°C
(73°F)		 23°C
(74°F)		 26°C
(80°F)		 31°C
(88°F)		 31°C
(89°F)		 35°C
(96°F)		 38°C
(101°F)		 38°C
(101°F)		 38°C
(101°F)		 32°C
(90°F)		 29°C
(84°F)		 23°C
(74°F)
Average high 16°C
(61°F)		 17°C
(63°F)		 18°C
(65°F)		 23°C
(73°F)		 24°C
(76°F)		 29°C
(84°F)		 32°C
(90°F)		 32°C
(90°F)		 30°C
(87°F)		 26°C
(79°F)		 21°C
(71°F)		 16°C
(61°F)
Daily mean 10°C
(51°F)		 11°C
(52°F)		 12°C
(55°F)		 16°C
(62°F)		 18°C
(65°F)		 22°C
(72°F)		 25°C
(78°F)		 26°C
(78°F)		 23°C
(74°F)		 19°C
(66°F)		 15°C
(59°F)		 10°C
(51°F)
Average low 6°C
(42°F)		 6°C
(42°F)		 7°C
(45°F)		 10°C
(51°F)		 12°C
(55°F)		 16°C
(62°F)		 19°C
(67°F)		 20°C
(68°F)		 17°C
(63°F)		 13°C
(55°F)		 9°C
(49°F)		 5°C
(42°F)
Mean minimum -0°C
(32°F)		 -0°C
(32°F)		 1°C
(34°F)		 6°C
(42°F)		 8°C
(46°F)		 11°C
(53°F)		 16°C
(60°F)		 16°C
(61°F)		 12°C
(53°F)		 7°C
(45°F)		 4°C
(40°F)		 0°C
(33°F)
Minimum -1°C
(30°F)		 -2°C
(29°F)		 0°C
(32°F)		 5°C
(41°F)		 6°C
(43°F)		 10°C
(50°F)		 13°C
(56°F)		 15°C
(59°F)		 9°C
(48°F)		 4°C
(40°F)		 1°C
(34°F)		 -1°C
(30°F)

Compare climate in Castaic with other places

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

Monthly average precipitation in Castaic, California, United States §

Castaic usually has the most precipitation in January, March and December, with an average of 6 rainy days and 67 mm (2.6 inches) of precipitation per month.The driest months in Castaic 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 Castaic, 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) 63 (2.5) 55 (2.2) 71 (2.8) 22 (0.9) 16 (0.6) 3 (0.1) 1 (0.1) 2 (0.1) 4 (0.2) 9 (0.3) 19 (0.7) 68 (2.7)
Average precipitation days (≥ 1 mm) 5 7 9 3 3 0 0 0 1 1 2 5

Monthly sunshine hours in Castaic, California, United States §

The sunniest months in Castaic are June, July and August, when the sun shines an average of 12 hours 4 minutes a day.Least sunny months in Castaic: January, February and December receive an average of 6 hours 58 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Castaic, 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 185 227 276 316 355 369 381 361 315 292 255 222
Mean daily daylight hours 10h 7m 10h 57m 11h 59m 13h 4m 13h 58m 14h 24m 14h 10m 13h 22m 12h 20m 11h 16m 10h 20m 9h 52m

Solar UV radiation in Castaic, California, United States §

Castaic experiences the highest level of ultraviolet (UV) radiation in May, 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 Castaic UV Index data.

Average daily maximum UV levels by month for Castaic, 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 11 11 12 11 10 7 5 4