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Monthly climate in Tustin, California, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Tustin features a hot-summer Mediterranean climate (Csa).Temperatures typically range between 13 °C (56 °F) and 23 °C (74 °F) through the year, but rarely can drop to 3 °C (38 °F) or can rise to as high as 41 °C (106 °F).The average annual precipitation amounts to about 354 mm (13.9 inches) and receives 34 rainy days on the 1 mm (0.04 inches) threshold annually.Tustin enjoys an average of 3584 hours of sunshine throughout the year, and daylight varies from 9 hours 56 minutes to 14 hours 20 minutes per day.

Monthly average temperatures in Tustin, California, United States §

The warmest months in Tustin are July, August and September, with daily mean temperatures ranging from 22 to 23 °C (72 - 74 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 13 to 13 °C (56 - 56 °F) throughout the day. On average each year, Tustin experiences 117 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 Tustin, 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 31°C
(88°F)		 30°C
(87°F)		 28°C
(83°F)		 35°C
(95°F)		 31°C
(88°F)		 34°C
(93°F)		 41°C
(106°F)		 36°C
(97°F)		 40°C
(104°F)		 38°C
(101°F)		 33°C
(92°F)		 28°C
(82°F)
Mean maximum 26°C
(80°F)		 25°C
(78°F)		 26°C
(80°F)		 31°C
(87°F)		 29°C
(85°F)		 30°C
(87°F)		 34°C
(94°F)		 33°C
(92°F)		 35°C
(95°F)		 34°C
(94°F)		 32°C
(89°F)		 25°C
(77°F)
Average high 19°C
(66°F)		 19°C
(66°F)		 19°C
(67°F)		 22°C
(71°F)		 22°C
(71°F)		 25°C
(77°F)		 28°C
(83°F)		 29°C
(84°F)		 28°C
(82°F)		 26°C
(79°F)		 23°C
(74°F)		 19°C
(66°F)
Daily mean 13°C
(56°F)		 13°C
(56°F)		 14°C
(58°F)		 17°C
(62°F)		 17°C
(64°F)		 20°C
(68°F)		 23°C
(73°F)		 23°C
(74°F)		 22°C
(72°F)		 20°C
(69°F)		 17°C
(62°F)		 13°C
(56°F)
Average low 9°C
(48°F)		 9°C
(48°F)		 10°C
(51°F)		 13°C
(55°F)		 14°C
(58°F)		 16°C
(61°F)		 19°C
(66°F)		 19°C
(67°F)		 18°C
(65°F)		 15°C
(60°F)		 12°C
(54°F)		 9°C
(48°F)
Mean minimum 5°C
(41°F)		 4°C
(40°F)		 6°C
(43°F)		 10°C
(50°F)		 11°C
(52°F)		 14°C
(57°F)		 16°C
(62°F)		 17°C
(62°F)		 15°C
(59°F)		 11°C
(52°F)		 8°C
(47°F)		 4°C
(40°F)
Minimum 3°C
(38°F)		 3°C
(38°F)		 5°C
(41°F)		 9°C
(49°F)		 9°C
(48°F)		 13°C
(55°F)		 16°C
(60°F)		 15°C
(60°F)		 13°C
(56°F)		 10°C
(50°F)		 7°C
(44°F)		 4°C
(39°F)

Compare climate in Tustin with other places

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

Monthly average precipitation in Tustin, California, United States §

Tustin usually has the most precipitation in January, March and December, with an average of 6 rainy days and 71 mm (2.8 inches) of precipitation per month.The driest months in Tustin 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 Tustin, 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) 71 (2.8) 60 (2.3) 68 (2.7) 27 (1.1) 13 (0.5) 1 (0.0) 2 (0.1) 2 (0.1) 3 (0.1) 10 (0.4) 25 (1.0) 74 (2.9)
Average precipitation days (≥ 1 mm) 5 5 9 3 4 0 0 0 0 1 2 5

Monthly sunshine hours in Tustin, California, United States §

The sunniest months in Tustin are June, July and August, when the sun shines an average of 12 hours 3 minutes a day.Least sunny months in Tustin: January, February and December receive an average of 7 hours 7 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Tustin, 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 188 236 289 318 353 369 379 361 316 293 255 223
Mean daily daylight hours 10h 11m 10h 58m 11h 59m 13h 2m 13h 55m 14h 20m 14h 6m 13h 19m 12h 19m 11h 17m 10h 23m 9h 56m

Solar UV radiation in Tustin, California, United States §

Tustin experiences the highest level of ultraviolet (UV) radiation in May, June and July, when the maximum UV index can reach values of 11 - 11, 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 Tustin UV Index data.

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