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Monthly climate in Sisters, Oregon, United States

Last updated: March 2, 2024

Under the Köppen–Geiger climate classification Sisters features a warm-summer Mediterranean climate (Csb). Temperatures typically range between 0 °C (33 °F) and 20 °C (69 °F) through the year, but rarely can drop to -24 °C (-11 °F) or can rise to as high as 42 °C (108 °F). The average annual precipitation amounts to about 654 mm (25.8 inches) and receives 106 rainy days on the 1 mm (0.04 inches) threshold annually. Sisters enjoys an average of 3081 hours of sunshine throughout the year, and daylight varies from 8 hours 53 minutes to 15 hours 26 minutes per day.

Monthly average temperatures in Sisters, Oregon, United States §

The warmest months in Sisters are June, July and August, with daily mean temperatures ranging from 16 to 20 °C (61 - 69 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 0 to 0 °C (33 - 33 °F) throughout the day. On average each year, Sisters experiences 75 days above 25 °C (77.0 °F) and 135 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Sisters, 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
(57°F)		 17°C
(62°F)		 19°C
(67°F)		 28°C
(83°F)		 31°C
(88°F)		 42°C
(108°F)		 37°C
(99°F)		 37°C
(100°F)		 37°C
(99°F)		 30°C
(87°F)		 22°C
(71°F)		 18°C
(65°F)
Mean maximum 10°C
(51°F)		 13°C
(56°F)		 17°C
(62°F)		 24°C
(75°F)		 28°C
(83°F)		 33°C
(92°F)		 35°C
(96°F)		 36°C
(98°F)		 33°C
(92°F)		 25°C
(77°F)		 18°C
(65°F)		 12°C
(55°F)
Average high 5°C
(40°F)		 6°C
(42°F)		 9°C
(48°F)		 13°C
(56°F)		 19°C
(66°F)		 24°C
(75°F)		 30°C
(86°F)		 29°C
(85°F)		 24°C
(75°F)		 15°C
(60°F)		 9°C
(48°F)		 5°C
(40°F)
Daily mean 0°C
(33°F)		 0°C
(33°F)		 3°C
(38°F)		 7°C
(45°F)		 12°C
(53°F)		 16°C
(61°F)		 20°C
(69°F)		 20°C
(68°F)		 15°C
(59°F)		 8°C
(47°F)		 3°C
(38°F)		 0°C
(33°F)
Average low -3°C
(27°F)		 -4°C
(26°F)		 -2°C
(29°F)		 1°C
(33°F)		 4°C
(40°F)		 8°C
(46°F)		 9°C
(49°F)		 10°C
(50°F)		 6°C
(43°F)		 1°C
(35°F)		 -1°C
(30°F)		 -3°C
(27°F)
Mean minimum -13°C
(9°F)		 -14°C
(8°F)		 -9°C
(16°F)		 -5°C
(23°F)		 -3°C
(27°F)		 1°C
(34°F)		 3°C
(37°F)		 2°C
(36°F)		 -0°C
(32°F)		 -6°C
(21°F)		 -9°C
(16°F)		 -12°C
(11°F)
Minimum -24°C
(-11°F)		 -22°C
(-7°F)		 -15°C
(5°F)		 -8°C
(17°F)		 -5°C
(23°F)		 -0°C
(32°F)		 0°C
(33°F)		 0°C
(33°F)		 -3°C
(26°F)		 -9°C
(16°F)		 -18°C
(0°F)		 -19°C
(-2°F)

Compare climate in Sisters with other places

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

Monthly average precipitation in Sisters, Oregon, United States §

Sisters usually has the most precipitation in January, February and December, with an average of 14 rainy days and 98 mm (3.9 inches) of precipitation per month. The driest months in Sisters are June, July and August. On average, 12 mm (0.5 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Sisters, 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) 93 (3.7) 109 (4.3) 66 (2.6) 67 (2.6) 37 (1.5) 22 (0.9) 6 (0.3) 8 (0.3) 36 (1.4) 43 (1.7) 74 (2.9) 93 (3.7)
Average precipitation days (≥ 1 mm) 13 15 13 11 8 6 1 2 5 7 11 14

Monthly sunshine hours in Sisters, Oregon, United States §

The sunniest months in Sisters are June, July and August, when the sun shines an average of 12 hours 24 minutes a day. Least sunny months in Sisters: January, February and December receive an average of 4 hours 23 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Sisters, 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 108 146 235 265 336 364 409 366 293 241 168 144
Mean daily daylight hours 9h 16m 10h 28m 11h 57m 13h 29m 14h 48m 15h 26m 15h 5m 13h 55m 12h 27m 10h 55m 9h 35m 8h 53m

Solar UV radiation in Sisters, Oregon, United States §

Sisters experiences the highest level of ultraviolet (UV) radiation in May, June and July, when the maximum UV index can reach values of 10 - 11, which corresponds to the Very High / Extreme category of sun exposure. January, November 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 Sisters UV Index data.

Average daily maximum UV levels by month for Sisters, 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) 3 4 6 8 11 10 10 9 8 6 3 2

Detailed Monthly Weather Insights for Sisters, Oregon, United States

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