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Monthly climate in Fallbrook, California, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Fallbrook features a hot-summer Mediterranean climate (Csa).Temperatures typically range between 13 °C (55 °F) and 25 °C (77 °F) through the year, but rarely can drop to 1 °C (35 °F) or can rise to as high as 43 °C (109 °F).The average annual precipitation amounts to about 365 mm (14.4 inches) and receives 40 rainy days on the 1 mm (0.04 inches) threshold annually.Fallbrook enjoys an average of 3643 hours of sunshine throughout the year, and daylight varies from 9 hours 57 minutes to 14 hours 19 minutes per day.

Monthly average temperatures in Fallbrook, California, United States §

The warmest months in Fallbrook are July, August and September, with daily mean temperatures ranging from 24 to 25 °C (75 - 77 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 13 to 13 °C (55 - 55 °F) throughout the day. On average each year, Fallbrook experiences 138 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 Fallbrook, 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
(86°F)		 28°C
(83°F)		 29°C
(84°F)		 34°C
(94°F)		 33°C
(91°F)		 36°C
(98°F)		 42°C
(109°F)		 37°C
(99°F)		 43°C
(109°F)		 38°C
(100°F)		 33°C
(92°F)		 28°C
(82°F)
Mean maximum 26°C
(79°F)		 25°C
(78°F)		 27°C
(81°F)		 31°C
(88°F)		 31°C
(87°F)		 33°C
(91°F)		 36°C
(98°F)		 36°C
(97°F)		 37°C
(99°F)		 35°C
(94°F)		 31°C
(89°F)		 26°C
(78°F)
Average high 19°C
(66°F)		 18°C
(65°F)		 19°C
(67°F)		 22°C
(72°F)		 23°C
(73°F)		 27°C
(81°F)		 31°C
(88°F)		 31°C
(89°F)		 30°C
(86°F)		 27°C
(81°F)		 23°C
(74°F)		 19°C
(66°F)
Daily mean 13°C
(55°F)		 13°C
(55°F)		 14°C
(57°F)		 17°C
(62°F)		 18°C
(64°F)		 21°C
(70°F)		 25°C
(77°F)		 25°C
(77°F)		 24°C
(75°F)		 20°C
(69°F)		 17°C
(62°F)		 13°C
(55°F)
Average low 8°C
(46°F)		 8°C
(46°F)		 9°C
(49°F)		 12°C
(54°F)		 14°C
(57°F)		 16°C
(62°F)		 20°C
(68°F)		 20°C
(69°F)		 19°C
(66°F)		 15°C
(59°F)		 11°C
(52°F)		 8°C
(46°F)
Mean minimum 4°C
(39°F)		 3°C
(37°F)		 5°C
(41°F)		 8°C
(47°F)		 9°C
(49°F)		 13°C
(55°F)		 16°C
(61°F)		 17°C
(63°F)		 15°C
(59°F)		 10°C
(50°F)		 7°C
(45°F)		 2°C
(37°F)
Minimum 2°C
(36°F)		 1°C
(35°F)		 3°C
(37°F)		 7°C
(45°F)		 8°C
(47°F)		 12°C
(53°F)		 14°C
(58°F)		 16°C
(61°F)		 12°C
(53°F)		 8°C
(47°F)		 5°C
(41°F)		 2°C
(35°F)

Compare climate in Fallbrook with other places

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

Monthly average precipitation in Fallbrook, California, United States §

Fallbrook usually has the most precipitation in January, March and December, with an average of 6 rainy days and 66 mm (2.6 inches) of precipitation per month.The driest months in Fallbrook are June, July and August. On average, 3 mm (0.1 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Fallbrook, 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) 66 (2.6) 64 (2.5) 67 (2.6) 31 (1.2) 19 (0.8) 3 (0.1) 4 (0.2) 3 (0.1) 4 (0.2) 11 (0.4) 28 (1.1) 66 (2.6)
Average precipitation days (≥ 1 mm) 5 6 10 3 5 0 0 1 1 2 2 5

Monthly sunshine hours in Fallbrook, California, United States §

The sunniest months in Fallbrook are May, June and July, when the sun shines an average of 12 hours 10 minutes a day.Least sunny months in Fallbrook: January, February and December receive an average of 7 hours 16 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Fallbrook, 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 190 244 297 326 366 373 380 362 319 297 257 226
Mean daily daylight hours 10h 12m 10h 59m 12h 0m 13h 2m 13h 54m 14h 19m 14h 5m 13h 19m 12h 19m 11h 17m 10h 24m 9h 57m

Solar UV radiation in Fallbrook, California, United States §

Fallbrook 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 Fallbrook UV Index data.

Average daily maximum UV levels by month for Fallbrook, 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 9 10 11 12 12 11 10 7 5 4