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Monthly climate in Arcata, California, United States

Last updated: March 2, 2024

Under the Köppen–Geiger climate classification Arcata features a warm-summer Mediterranean climate (Csb). Temperatures typically range between 7 °C (45 °F) and 16 °C (61 °F) through the year, but rarely can drop to -1 °C (30 °F) or can rise to as high as 31 °C (88 °F). The average annual precipitation amounts to about 1201 mm (47.3 inches) and receives 93 rainy days on the 1 mm (0.04 inches) threshold annually. Arcata enjoys an average of 3179 hours of sunshine throughout the year, and daylight varies from 9 hours 17 minutes to 15 hours 2 minutes per day.

Monthly average temperatures in Arcata, California, United States §

The warmest months in Arcata are July, August and September, with daily mean temperatures ranging from 15 to 16 °C (59 - 61 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 7 to 8 °C (45 - 46 °F) throughout the day. On average each year, Arcata experiences 3 days above 25 °C (77.0 °F) and 2 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Arcata, 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 18°C
(65°F)		 20°C
(69°F)		 18°C
(64°F)		 20°C
(69°F)		 22°C
(72°F)		 27°C
(81°F)		 24°C
(75°F)		 27°C
(81°F)		 31°C
(88°F)		 25°C
(77°F)		 19°C
(67°F)		 18°C
(64°F)
Mean maximum 16°C
(61°F)		 16°C
(62°F)		 17°C
(62°F)		 19°C
(66°F)		 19°C
(67°F)		 22°C
(72°F)		 23°C
(73°F)		 25°C
(77°F)		 27°C
(81°F)		 23°C
(74°F)		 18°C
(66°F)		 16°C
(61°F)
Average high 11°C
(52°F)		 10°C
(51°F)		 11°C
(52°F)		 13°C
(55°F)		 14°C
(58°F)		 17°C
(63°F)		 19°C
(66°F)		 20°C
(68°F)		 19°C
(67°F)		 17°C
(62°F)		 13°C
(56°F)		 11°C
(51°F)
Daily mean 8°C
(46°F)		 7°C
(45°F)		 8°C
(46°F)		 9°C
(49°F)		 11°C
(52°F)		 14°C
(57°F)		 15°C
(59°F)		 16°C
(61°F)		 15°C
(59°F)		 12°C
(54°F)		 10°C
(49°F)		 7°C
(45°F)
Average low 5°C
(41°F)		 4°C
(40°F)		 5°C
(41°F)		 6°C
(44°F)		 8°C
(47°F)		 10°C
(51°F)		 12°C
(53°F)		 12°C
(55°F)		 11°C
(53°F)		 9°C
(48°F)		 6°C
(44°F)		 5°C
(41°F)
Mean minimum 1°C
(35°F)		 0°C
(33°F)		 1°C
(34°F)		 3°C
(38°F)		 5°C
(41°F)		 6°C
(44°F)		 9°C
(49°F)		 10°C
(50°F)		 8°C
(46°F)		 5°C
(41°F)		 2°C
(36°F)		 1°C
(35°F)
Minimum -0°C
(32°F)		 -1°C
(31°F)		 -0°C
(32°F)		 2°C
(36°F)		 3°C
(37°F)		 6°C
(43°F)		 8°C
(48°F)		 9°C
(48°F)		 6°C
(43°F)		 4°C
(39°F)		 -1°C
(30°F)		 -0°C
(32°F)

Compare climate in Arcata with other places

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

Monthly average precipitation in Arcata, California, United States §

Arcata usually has the most precipitation in January, February and March, with an average of 14 rainy days and 202 mm (8.0 inches) of precipitation per month. The driest months in Arcata are June, July and August. On average, 11 mm (0.4 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Arcata, 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) 219 (8.6) 212 (8.3) 176 (6.9) 108 (4.2) 64 (2.5) 22 (0.9) 6 (0.2) 5 (0.2) 29 (1.1) 62 (2.4) 133 (5.2) 165 (6.5)
Average precipitation days (≥ 1 mm) 14 13 16 10 6 3 0 0 3 5 10 13

Monthly sunshine hours in Arcata, California, United States §

The sunniest months in Arcata are June, July and August, when the sun shines an average of 12 hours 14 minutes a day. Least sunny months in Arcata: January, February and December receive an average of 4 hours 59 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Arcata, 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 115 180 235 266 329 369 396 359 299 267 199 158
Mean daily daylight hours 9h 36m 10h 39m 11h 58m 13h 19m 14h 28m 15h 2m 14h 43m 13h 42m 12h 24m 11h 3m 9h 52m 9h 17m

Solar UV radiation in Arcata, California, United States §

Arcata experiences the highest level of ultraviolet (UV) radiation in May, June and August, when the maximum UV index can reach values of 10 - 11, which corresponds to the Very High / Extreme category of sun exposure. January, February and December are in the Low / Moderate exposure category. In these months, the maximum values of the UV index do not exceed 4. For more detailed information, check out our hourly Arcata UV Index data.

Average daily maximum UV levels by month for Arcata, 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) 3 4 7 8 10 11 10 10 8 6 4 2

Detailed Monthly Weather Insights for Arcata, California, United States

Discover in-depth weather details for every month in Arcata. 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 Arcata'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.