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Monthly climate in Monmouth, Oregon, United States

Last updated: March 2, 2024

Under the Köppen–Geiger climate classification Monmouth features a warm-summer Mediterranean climate (Csb). Temperatures typically range between 5 °C (41 °F) and 20 °C (69 °F) through the year, but rarely can drop to -11 °C (13 °F) or can rise to as high as 44 °C (111 °F). The average annual precipitation amounts to about 1174 mm (46.2 inches) and receives 129 rainy days on the 1 mm (0.04 inches) threshold annually. Monmouth enjoys an average of 2741 hours of sunshine throughout the year, and daylight varies from 8 hours 49 minutes to 15 hours 31 minutes per day.

Monthly average temperatures in Monmouth, Oregon, United States §

The warmest months in Monmouth are July, August and September, with daily mean temperatures ranging from 17 to 20 °C (63 - 69 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 5 to 5 °C (41 - 42 °F) throughout the day. On average each year, Monmouth experiences 64 days above 25 °C (77.0 °F) and 40 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Monmouth, Oregon, 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 15°C
(59°F)		 16°C
(62°F)		 22°C
(73°F)		 27°C
(81°F)		 30°C
(87°F)		 44°C
(111°F)		 36°C
(98°F)		 40°C
(104°F)		 35°C
(96°F)		 26°C
(79°F)		 19°C
(67°F)		 16°C
(62°F)
Mean maximum 14°C
(57°F)		 14°C
(57°F)		 19°C
(66°F)		 24°C
(76°F)		 28°C
(83°F)		 33°C
(92°F)		 35°C
(95°F)		 37°C
(99°F)		 33°C
(91°F)		 23°C
(74°F)		 17°C
(64°F)		 14°C
(57°F)
Average high 8°C
(48°F)		 9°C
(48°F)		 12°C
(54°F)		 15°C
(60°F)		 19°C
(67°F)		 23°C
(74°F)		 28°C
(82°F)		 28°C
(83°F)		 24°C
(76°F)		 17°C
(63°F)		 12°C
(53°F)		 8°C
(46°F)
Daily mean 5°C
(42°F)		 5°C
(41°F)		 7°C
(45°F)		 10°C
(50°F)		 13°C
(56°F)		 17°C
(63°F)		 20°C
(68°F)		 20°C
(69°F)		 17°C
(63°F)		 11°C
(53°F)		 8°C
(46°F)		 5°C
(41°F)
Average low 2°C
(37°F)		 2°C
(35°F)		 3°C
(38°F)		 5°C
(41°F)		 8°C
(47°F)		 11°C
(52°F)		 13°C
(55°F)		 13°C
(56°F)		 11°C
(53°F)		 6°C
(44°F)		 4°C
(40°F)		 2°C
(36°F)
Mean minimum -4°C
(25°F)		 -5°C
(23°F)		 -3°C
(28°F)		 -1°C
(30°F)		 2°C
(36°F)		 5°C
(42°F)		 9°C
(48°F)		 8°C
(48°F)		 5°C
(42°F)		 -1°C
(31°F)		 -3°C
(27°F)		 -5°C
(23°F)
Minimum -11°C
(13°F)		 -8°C
(18°F)		 -4°C
(24°F)		 -2°C
(29°F)		 2°C
(35°F)		 5°C
(40°F)		 6°C
(44°F)		 7°C
(45°F)		 4°C
(40°F)		 -4°C
(26°F)		 -5°C
(24°F)		 -6°C
(21°F)

Compare climate in Monmouth with other places

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

Monthly average precipitation in Monmouth, Oregon, United States §

Monmouth usually has the most precipitation in January, February and December, with an average of 17 rainy days and 175 mm (6.9 inches) of precipitation per month. The driest months in Monmouth are June, July and August. On average, 18 mm (0.7 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Monmouth, Oregon, 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) 162 (6.4) 174 (6.9) 131 (5.2) 113 (4.5) 57 (2.3) 44 (1.7) 4 (0.1) 6 (0.2) 61 (2.4) 88 (3.5) 145 (5.7) 187 (7.4)
Average precipitation days (≥ 1 mm) 17 17 16 14 9 6 0 0 7 10 14 19

Monthly sunshine hours in Monmouth, Oregon, United States §

The sunniest months in Monmouth are June, July and August, when the sun shines an average of 11 hours 34 minutes a day. Least sunny months in Monmouth: January, February and December receive an average of 3 hours 37 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Monmouth, Oregon, 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 92 122 195 233 294 330 384 349 270 216 137 114
Mean daily daylight hours 9h 13m 10h 26m 11h 57m 13h 31m 14h 51m 15h 31m 15h 9m 13h 57m 12h 27m 10h 54m 9h 32m 8h 49m

Solar UV radiation in Monmouth, Oregon, United States §

Monmouth experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 9 - 10, which corresponds to the Very High 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 3. For more detailed information, check out our hourly Monmouth UV Index data.

Average daily maximum UV levels by month for Monmouth, Oregon, 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) 2 3 6 7 9 10 10 9 7 5 3 2

Detailed Monthly Weather Insights for Monmouth, Oregon, United States

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