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Monthly climate in Tualatin, Oregon, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Tualatin features a warm-summer Mediterranean climate (Csb).Temperatures typically range between 5 °C (41 °F) and 21 °C (70 °F) through the year, but rarely can drop to -14 °C (7 °F) or can rise to as high as 47 °C (118 °F).The average annual precipitation amounts to about 1210 mm (47.6 inches) and receives 146 rainy days on the 1 mm (0.04 inches) threshold annually.Tualatin enjoys an average of 2674 hours of sunshine throughout the year, and daylight varies from 8 hours 45 minutes to 15 hours 35 minutes per day.

Monthly average temperatures in Tualatin, Oregon, United States §

The warmest months in Tualatin are July, August and September, with daily mean temperatures ranging from 18 to 21 °C (64 - 70 °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, Tualatin experiences 63 days above 25 °C (77.0 °F) and 30 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Tualatin, 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)		 17°C
(63°F)		 24°C
(75°F)		 29°C
(84°F)		 32°C
(90°F)		 47°C
(118°F)		 37°C
(99°F)		 40°C
(104°F)		 35°C
(95°F)		 26°C
(79°F)		 19°C
(67°F)		 16°C
(60°F)
Mean maximum 13°C
(56°F)		 14°C
(58°F)		 19°C
(67°F)		 25°C
(77°F)		 29°C
(85°F)		 35°C
(95°F)		 35°C
(95°F)		 38°C
(100°F)		 33°C
(91°F)		 23°C
(74°F)		 18°C
(64°F)		 14°C
(57°F)
Average high 9°C
(48°F)		 9°C
(48°F)		 12°C
(55°F)		 16°C
(61°F)		 20°C
(68°F)		 24°C
(75°F)		 28°C
(82°F)		 29°C
(84°F)		 24°C
(75°F)		 17°C
(63°F)		 12°C
(53°F)		 8°C
(47°F)
Daily mean 5°C
(42°F)		 5°C
(41°F)		 8°C
(46°F)		 11°C
(51°F)		 14°C
(58°F)		 18°C
(64°F)		 21°C
(69°F)		 21°C
(70°F)		 18°C
(64°F)		 12°C
(53°F)		 8°C
(47°F)		 5°C
(41°F)
Average low 3°C
(37°F)		 2°C
(36°F)		 4°C
(39°F)		 6°C
(43°F)		 9°C
(49°F)		 12°C
(54°F)		 14°C
(57°F)		 14°C
(58°F)		 12°C
(54°F)		 7°C
(45°F)		 5°C
(41°F)		 3°C
(37°F)
Mean minimum -5°C
(23°F)		 -5°C
(23°F)		 -2°C
(28°F)		 1°C
(33°F)		 3°C
(39°F)		 7°C
(45°F)		 10°C
(50°F)		 10°C
(49°F)		 6°C
(44°F)		 -0°C
(32°F)		 -2°C
(28°F)		 -3°C
(26°F)
Minimum -14°C
(7°F)		 -7°C
(19°F)		 -4°C
(26°F)		 -1°C
(31°F)		 2°C
(36°F)		 6°C
(43°F)		 9°C
(49°F)		 9°C
(48°F)		 6°C
(42°F)		 -2°C
(29°F)		 -5°C
(24°F)		 -5°C
(24°F)

Compare climate in Tualatin with other places

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

Monthly average precipitation in Tualatin, Oregon, United States §

Tualatin usually has the most precipitation in January, February and December, with an average of 18 rainy days and 173 mm (6.8 inches) of precipitation per month.The driest months in Tualatin are June, July and August. On average, 20 mm (0.8 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Tualatin, 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) 163 (6.4) 172 (6.8) 135 (5.3) 117 (4.6) 58 (2.3) 46 (1.8) 6 (0.2) 8 (0.3) 62 (2.4) 105 (4.1) 155 (6.1) 183 (7.2)
Average precipitation days (≥ 1 mm) 17 19 17 15 10 8 1 2 8 12 18 19

Monthly sunshine hours in Tualatin, Oregon, United States §

The sunniest months in Tualatin are June, July and August, when the sun shines an average of 11 hours 9 minutes a day.Least sunny months in Tualatin: January, February and December receive an average of 3 hours 34 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Tualatin, 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 88 122 195 229 282 317 373 334 268 211 136 115
Mean daily daylight hours 9h 9m 10h 24m 11h 57m 13h 33m 14h 55m 15h 35m 15h 13m 13h 59m 12h 27m 10h 52m 9h 28m 8h 45m

Solar UV radiation in Tualatin, Oregon, United States §

Tualatin experiences the highest level of ultraviolet (UV) radiation in May, June and July, 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 Tualatin UV Index data.

Average daily maximum UV levels by month for Tualatin, 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 5 6 9 10 10 8 7 5 3 2