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Monthly climate in San Luis Obispo, California, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification San Luis Obispo features a warm-summer Mediterranean climate (Csb).Temperatures typically range between 12 °C (54 °F) and 18 °C (65 °F) through the year, but rarely can drop to 4 °C (39 °F) or can rise to as high as 35 °C (95 °F).The average annual precipitation amounts to about 431 mm (17.0 inches) and receives 35 rainy days on the 1 mm (0.04 inches) threshold annually.San Luis Obispo enjoys an average of 3569 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 San Luis Obispo, California, United States §

The warmest months in San Luis Obispo are July, August and September, with daily mean temperatures ranging from 18 to 18 °C (64 - 65 °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, San Luis Obispo experiences 17 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 San Luis Obispo, 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 23°C
(74°F)		 25°C
(77°F)		 24°C
(76°F)		 26°C
(80°F)		 25°C
(77°F)		 31°C
(88°F)		 31°C
(89°F)		 31°C
(88°F)		 35°C
(95°F)		 33°C
(92°F)		 26°C
(79°F)		 23°C
(74°F)
Mean maximum 21°C
(70°F)		 21°C
(70°F)		 22°C
(72°F)		 24°C
(76°F)		 23°C
(74°F)		 25°C
(78°F)		 28°C
(82°F)		 27°C
(82°F)		 30°C
(86°F)		 29°C
(85°F)		 25°C
(77°F)		 21°C
(70°F)
Average high 16°C
(61°F)		 16°C
(61°F)		 16°C
(61°F)		 18°C
(64°F)		 18°C
(65°F)		 20°C
(68°F)		 21°C
(71°F)		 22°C
(72°F)		 22°C
(72°F)		 22°C
(72°F)		 19°C
(67°F)		 16°C
(61°F)
Daily mean 12°C
(54°F)		 12°C
(54°F)		 13°C
(55°F)		 14°C
(57°F)		 15°C
(59°F)		 16°C
(62°F)		 18°C
(64°F)		 18°C
(65°F)		 18°C
(65°F)		 17°C
(64°F)		 15°C
(59°F)		 12°C
(54°F)
Average low 9°C
(49°F)		 9°C
(48°F)		 9°C
(49°F)		 11°C
(52°F)		 12°C
(53°F)		 14°C
(57°F)		 15°C
(59°F)		 15°C
(60°F)		 15°C
(60°F)		 14°C
(57°F)		 11°C
(53°F)		 9°C
(49°F)
Mean minimum 5°C
(42°F)		 5°C
(41°F)		 6°C
(43°F)		 8°C
(46°F)		 9°C
(49°F)		 11°C
(53°F)		 13°C
(55°F)		 13°C
(56°F)		 12°C
(54°F)		 10°C
(51°F)		 8°C
(46°F)		 6°C
(43°F)
Minimum 4°C
(40°F)		 4°C
(39°F)		 5°C
(41°F)		 7°C
(44°F)		 8°C
(47°F)		 11°C
(51°F)		 12°C
(55°F)		 13°C
(55°F)		 11°C
(53°F)		 9°C
(49°F)		 6°C
(42°F)		 5°C
(42°F)

Compare climate in San Luis Obispo with other places

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

Monthly average precipitation in San Luis Obispo, California, United States §

San Luis Obispo usually has the most precipitation in January, February and March, with an average of 7 rainy days and 91 mm (3.6 inches) of precipitation per month.The driest months in San Luis Obispo are June, August and September. On average, 1 mm (0.0 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in San Luis Obispo, 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) 110 (4.3) 80 (3.2) 84 (3.3) 23 (0.9) 12 (0.5) 1 (0.0) 1 (0.0) 1 (0.0) 1 (0.0) 10 (0.4) 32 (1.2) 76 (3.0)
Average precipitation days (≥ 1 mm) 6 6 9 3 2 0 0 0 0 0 3 6

Monthly sunshine hours in San Luis Obispo, California, United States §

The sunniest months in San Luis Obispo are May, June and July, when the sun shines an average of 12 hours 12 minutes a day.Least sunny months in San Luis Obispo: January, February and December receive an average of 6 hours 56 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in San Luis Obispo, 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 178 229 284 315 368 371 383 357 315 295 246 223
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 San Luis Obispo, California, United States §

San Luis Obispo 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, February 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 San Luis Obispo UV Index data.

Average daily maximum UV levels by month for San Luis Obispo, 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 5 8 9 10 12 12 11 9 7 5 3