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Monthly climate in Twin Falls, Idaho, United States

Last updated: March 2, 2024

Under the Köppen–Geiger climate classification Twin Falls features a cold semi-arid climate (BSk). Temperatures typically range between -1 °C (31 °F) and 26 °C (80 °F) through the year, but rarely can drop to -27 °C (-16 °F) or can rise to as high as 41 °C (106 °F). The average annual precipitation amounts to about 338 mm (13.3 inches) and receives 69 rainy days on the 1 mm (0.04 inches) threshold annually. Twin Falls enjoys an average of 3300 hours of sunshine throughout the year, and daylight varies from 9 hours 5 minutes to 15 hours 14 minutes per day.

Monthly average temperatures in Twin Falls, Idaho, United States §

The warmest months in Twin Falls are June, July and August, with daily mean temperatures ranging from 21 to 26 °C (70 - 80 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -1 to 1 °C (31 - 34 °F) throughout the day. On average each year, Twin Falls experiences 99 days above 25 °C (77.0 °F) and 103 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Twin Falls, Idaho, 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 16°C
(62°F)		 18°C
(64°F)		 25°C
(78°F)		 31°C
(89°F)		 35°C
(96°F)		 39°C
(102°F)		 40°C
(104°F)		 41°C
(106°F)		 39°C
(103°F)		 30°C
(87°F)		 24°C
(75°F)		 16°C
(60°F)
Mean maximum 10°C
(51°F)		 14°C
(58°F)		 21°C
(70°F)		 28°C
(82°F)		 32°C
(90°F)		 33°C
(91°F)		 39°C
(102°F)		 39°C
(102°F)		 37°C
(99°F)		 27°C
(81°F)		 19°C
(67°F)		 12°C
(54°F)
Average high 4°C
(39°F)		 6°C
(43°F)		 12°C
(55°F)		 17°C
(62°F)		 21°C
(71°F)		 28°C
(83°F)		 34°C
(94°F)		 33°C
(91°F)		 27°C
(80°F)		 17°C
(63°F)		 11°C
(52°F)		 4°C
(40°F)
Daily mean -1°C
(31°F)		 1°C
(34°F)		 6°C
(43°F)		 10°C
(50°F)		 15°C
(59°F)		 21°C
(70°F)		 26°C
(80°F)		 25°C
(76°F)		 19°C
(66°F)		 10°C
(50°F)		 5°C
(41°F)		 -0°C
(32°F)
Average low -4°C
(25°F)		 -3°C
(27°F)		 1°C
(34°F)		 4°C
(39°F)		 8°C
(46°F)		 13°C
(55°F)		 18°C
(64°F)		 16°C
(62°F)		 11°C
(52°F)		 4°C
(39°F)		 -0°C
(32°F)		 -4°C
(25°F)
Mean minimum -14°C
(7°F)		 -11°C
(13°F)		 -6°C
(21°F)		 -3°C
(27°F)		 1°C
(34°F)		 6°C
(42°F)		 11°C
(52°F)		 10°C
(50°F)		 3°C
(38°F)		 -5°C
(23°F)		 -7°C
(19°F)		 -10°C
(14°F)
Minimum -27°C
(-16°F)		 -13°C
(8°F)		 -9°C
(15°F)		 -5°C
(23°F)		 -1°C
(30°F)		 4°C
(39°F)		 8°C
(48°F)		 6°C
(42°F)		 1°C
(35°F)		 -12°C
(10°F)		 -9°C
(16°F)		 -12°C
(10°F)

Compare climate in Twin Falls with other places

Compare temperature, precipitation, sunshine, UV index in Twin Falls, Idaho, United States with other places around the world.

Monthly average precipitation in Twin Falls, Idaho, United States §

Twin Falls usually has the most precipitation in January, February and December, with an average of 8 rainy days and 42 mm (1.6 inches) of precipitation per month. The driest months in Twin Falls are July, August and September. On average, 10 mm (0.4 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Twin Falls, Idaho, 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) 40 (1.6) 46 (1.8) 39 (1.5) 33 (1.3) 39 (1.5) 16 (0.6) 5 (0.2) 10 (0.4) 16 (0.6) 26 (1.0) 32 (1.2) 39 (1.5)
Average precipitation days (≥ 1 mm) 8 10 10 8 7 2 1 2 2 4 7 8

Monthly sunshine hours in Twin Falls, Idaho, United States §

The sunniest months in Twin Falls are June, July and August, when the sun shines an average of 12 hours 12 minutes a day. Least sunny months in Twin Falls: January, February and December receive an average of 5 hours 32 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Twin Falls, Idaho, 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 142 186 270 291 337 377 391 354 307 262 205 175
Mean daily daylight hours 9h 27m 10h 33m 11h 58m 13h 24m 14h 38m 15h 14m 14h 54m 13h 48m 12h 25m 10h 59m 9h 44m 9h 5m

Solar UV radiation in Twin Falls, Idaho, United States §

Twin Falls experiences the highest level of ultraviolet (UV) radiation in June, July 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, November and December are in the 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 Twin Falls UV Index data.

Average daily maximum UV levels by month for Twin Falls, Idaho, 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 5 7 8 10 11 11 10 9 6 4 3

Detailed Monthly Weather Insights for Twin Falls, Idaho, United States

Discover in-depth weather details for every month in Twin Falls. 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 Twin Falls'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.