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Monthly climate in Fortuna, California, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Fortuna features a warm-summer Mediterranean climate (Csb).Temperatures typically range between 8 °C (47 °F) and 16 °C (61 °F) through the year, but rarely can drop to 0 °C (32 °F) or can rise to as high as 32 °C (90 °F).The average annual precipitation amounts to about 1064 mm (41.9 inches) and receives 89 rainy days on the 1 mm (0.04 inches) threshold annually.Fortuna enjoys an average of 3259 hours of sunshine throughout the year, and daylight varies from 9 hours 18 minutes to 15 hours 0 minutes per day.

Monthly average temperatures in Fortuna, California, United States §

The warmest months in Fortuna 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 March, when daily mean temperatures range from 8 to 9 °C (47 - 48 °F) throughout the day. On average each year, Fortuna experiences 4 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 Fortuna, 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 20°C
(68°F)		 21°C
(69°F)		 19°C
(67°F)		 21°C
(71°F)		 23°C
(73°F)		 28°C
(82°F)		 24°C
(75°F)		 28°C
(83°F)		 32°C
(90°F)		 26°C
(79°F)		 21°C
(70°F)		 18°C
(64°F)
Mean maximum 16°C
(61°F)		 17°C
(63°F)		 17°C
(63°F)		 20°C
(67°F)		 19°C
(67°F)		 22°C
(72°F)		 23°C
(74°F)		 25°C
(77°F)		 28°C
(82°F)		 24°C
(75°F)		 19°C
(67°F)		 17°C
(63°F)
Average high 12°C
(54°F)		 11°C
(53°F)		 12°C
(54°F)		 14°C
(57°F)		 15°C
(59°F)		 17°C
(64°F)		 19°C
(66°F)		 20°C
(68°F)		 20°C
(69°F)		 18°C
(64°F)		 14°C
(58°F)		 12°C
(53°F)
Daily mean 9°C
(48°F)		 8°C
(47°F)		 9°C
(48°F)		 10°C
(51°F)		 12°C
(53°F)		 14°C
(57°F)		 15°C
(59°F)		 16°C
(61°F)		 16°C
(61°F)		 13°C
(56°F)		 11°C
(51°F)		 9°C
(48°F)
Average low 7°C
(44°F)		 6°C
(43°F)		 6°C
(43°F)		 8°C
(46°F)		 9°C
(48°F)		 11°C
(52°F)		 12°C
(53°F)		 12°C
(55°F)		 12°C
(54°F)		 10°C
(50°F)		 8°C
(47°F)		 7°C
(44°F)
Mean minimum 2°C
(37°F)		 2°C
(36°F)		 3°C
(37°F)		 4°C
(40°F)		 6°C
(43°F)		 8°C
(47°F)		 10°C
(50°F)		 10°C
(51°F)		 9°C
(49°F)		 6°C
(44°F)		 4°C
(39°F)		 3°C
(38°F)
Minimum 0°C
(33°F)		 0°C
(32°F)		 2°C
(35°F)		 3°C
(38°F)		 4°C
(40°F)		 7°C
(46°F)		 9°C
(49°F)		 9°C
(49°F)		 8°C
(47°F)		 5°C
(42°F)		 2°C
(35°F)		 3°C
(38°F)

Compare climate in Fortuna with other places

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

Monthly average precipitation in Fortuna, California, United States §

Fortuna usually has the most precipitation in January, February and March, with an average of 13 rainy days and 186 mm (7.3 inches) of precipitation per month.The driest months in Fortuna are June, July and August. On average, 7 mm (0.3 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Fortuna, 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) 205 (8.1) 188 (7.4) 164 (6.5) 93 (3.7) 61 (2.4) 17 (0.7) 2 (0.1) 2 (0.1) 20 (0.8) 49 (1.9) 112 (4.4) 150 (5.9)
Average precipitation days (≥ 1 mm) 14 12 15 10 6 3 0 0 3 5 9 12

Monthly sunshine hours in Fortuna, California, United States §

The sunniest months in Fortuna are June, July and August, when the sun shines an average of 12 hours 14 minutes a day.Least sunny months in Fortuna: January, February and December receive an average of 5 hours 17 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Fortuna, 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 122 192 251 281 340 374 395 356 303 271 203 166
Mean daily daylight hours 9h 38m 10h 40m 11h 58m 13h 19m 14h 27m 15h 0m 14h 42m 13h 41m 12h 24m 11h 3m 9h 53m 9h 18m

Solar UV radiation in Fortuna, California, United States §

Fortuna 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 Fortuna UV Index data.

Average daily maximum UV levels by month for Fortuna, 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