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Monthly climate in Hillsboro, Oregon, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Hillsboro 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 -12 °C (10 °F) or can rise to as high as 45 °C (113 °F).The average annual precipitation amounts to about 1217 mm (47.9 inches) and receives 137 rainy days on the 1 mm (0.04 inches) threshold annually.Hillsboro enjoys an average of 2614 hours of sunshine throughout the year, and daylight varies from 8 hours 45 minutes to 15 hours 36 minutes per day.

Monthly average temperatures in Hillsboro, Oregon, United States §

The warmest months in Hillsboro are July, August and September, with daily mean temperatures ranging from 17 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, Hillsboro experiences 60 days above 25 °C (77.0 °F) and 27 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Hillsboro, 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 14°C
(58°F)		 17°C
(62°F)		 23°C
(73°F)		 28°C
(83°F)		 32°C
(89°F)		 45°C
(113°F)		 37°C
(99°F)		 39°C
(103°F)		 34°C
(94°F)		 25°C
(78°F)		 18°C
(65°F)		 15°C
(59°F)
Mean maximum 13°C
(55°F)		 14°C
(57°F)		 19°C
(66°F)		 24°C
(76°F)		 29°C
(84°F)		 34°C
(93°F)		 34°C
(94°F)		 37°C
(99°F)		 32°C
(90°F)		 22°C
(73°F)		 17°C
(63°F)		 13°C
(56°F)
Average high 8°C
(47°F)		 9°C
(48°F)		 12°C
(54°F)		 15°C
(60°F)		 20°C
(68°F)		 23°C
(74°F)		 27°C
(81°F)		 28°C
(83°F)		 23°C
(74°F)		 16°C
(62°F)		 11°C
(52°F)		 8°C
(46°F)
Daily mean 5°C
(42°F)		 5°C
(41°F)		 7°C
(46°F)		 10°C
(51°F)		 14°C
(58°F)		 17°C
(64°F)		 20°C
(69°F)		 21°C
(70°F)		 17°C
(64°F)		 11°C
(53°F)		 8°C
(46°F)		 5°C
(41°F)
Average low 3°C
(37°F)		 2°C
(35°F)		 4°C
(39°F)		 6°C
(42°F)		 9°C
(48°F)		 12°C
(53°F)		 14°C
(57°F)		 15°C
(58°F)		 12°C
(54°F)		 7°C
(45°F)		 5°C
(41°F)		 2°C
(37°F)
Mean minimum -4°C
(25°F)		 -5°C
(23°F)		 -2°C
(29°F)		 -0°C
(32°F)		 3°C
(38°F)		 7°C
(44°F)		 10°C
(50°F)		 9°C
(49°F)		 6°C
(44°F)		 0°C
(33°F)		 -2°C
(29°F)		 -4°C
(26°F)
Minimum -12°C
(10°F)		 -6°C
(21°F)		 -3°C
(27°F)		 -1°C
(30°F)		 2°C
(36°F)		 5°C
(41°F)		 7°C
(45°F)		 9°C
(48°F)		 5°C
(41°F)		 -1°C
(30°F)		 -5°C
(24°F)		 -5°C
(24°F)

Compare climate in Hillsboro with other places

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

Monthly average precipitation in Hillsboro, Oregon, United States §

Hillsboro usually has the most precipitation in January, February and December, with an average of 17 rainy days and 176 mm (6.9 inches) of precipitation per month.The driest months in Hillsboro are June, July and August. On average, 19 mm (0.8 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Hillsboro, 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) 173 (6.8) 166 (6.5) 132 (5.2) 115 (4.5) 55 (2.2) 47 (1.9) 5 (0.2) 6 (0.2) 66 (2.6) 101 (4.0) 163 (6.4) 188 (7.4)
Average precipitation days (≥ 1 mm) 17 17 17 14 9 7 1 1 8 10 17 19

Monthly sunshine hours in Hillsboro, Oregon, United States §

The sunniest months in Hillsboro are June, July and August, when the sun shines an average of 10 hours 54 minutes a day.Least sunny months in Hillsboro: January, February and December receive an average of 3 hours 28 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Hillsboro, 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 86 121 192 222 279 309 365 329 265 206 127 108
Mean daily daylight hours 9h 9m 10h 23m 11h 57m 13h 33m 14h 55m 15h 36m 15h 13m 14h 0m 12h 27m 10h 52m 9h 28m 8h 45m

Solar UV radiation in Hillsboro, Oregon, United States §

Hillsboro 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 Hillsboro UV Index data.

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