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January Weather in Sun Valley, United States

Last updated: June 24, 2025

In January, the average temperature in Sun Valley, United States hovers around 0°C (33°F), with extremes ranging from a chilling -20°C (-3°F) to a mild 16°C (60°F). Expect 91 mm (3.6 in) of precipitation over 7 days, contributing to an average humidity of 85%. Prepare for a blend of brisk air and occasional moisture!

January Temperature in Sun Valley

In January in Sun Valley, the average temperature is 0°C (33°F). The maximum can reach 16°C (60°F), and the minimum can be as low as -20°C (-3°F). Be prepared for a wide range of temperatures when traveling to Sun Valley during this month.

January Weather in Sun Valley: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Sun Valley, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sun Valley, January typically has an average temperature of 0°C (33°F), with highs reaching up to 16°C (60°F) and lows dropping to around -20°C (-3°F).
JanFebMarAprMayJunJulAugSepOctNovDec323338475566747364504132
Data source: Temperature data for Sun Valley generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

January Precipitation in Sun Valley

In Sun Valley in January, the precipitation amount is 91 mm (3.6 in) over a span of 7 days.

January Precipitation Trends in Sun Valley

The chart displays monthly precipitation patterns in Sun Valley, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In Sun Valley, January typically receives around 91 mm (3.6 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec9187713239811118333965
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
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January Humidity in Sun Valley

In Sun Valley in January, humidity is 85%. With an average temperature of 0°C (33°F), this humidity feels like a heavy blanket, making the air feel colder and more biting, while creating an uncomfortable clamminess that can dampen the thrill of traveling.

January Average Humidity in Sun Valley

This chart illustrates the average monthly humidity levels in Sun Valley, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in Sun Valley is approximately 85%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%87%84%78%64%56%44%34%41%60%81%82%
Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Sun Valley

In Sun Valley in January, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Sun Valley for better planning.

Maximum UV Index Levels in Sun Valley for January

The chart shows the monthly maximum UV Index (UVI) for Sun Valley in January, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In January, the maximum UV index in Sun Valley typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46891112121110743
Data source: Sun Valley January UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How January Weather in Sun Valley Compares to Other Months

Weather in Sun Valley varies notably across the year, with each month offering distinct climate conditions. This page compares January’s weather to other months in Sun Valley, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Sun Valley, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (33°F)91 mm (3.6 inches)85%moderate
February Weather1°C (34°F)87 mm (3.4 inches)87%high
March Weather3°C (38°F)71 mm (2.8 inches)84%very high
April Weather8°C (47°F)32 mm (1.3 inches)78%very high
May Weather13°C (55°F)39 mm (1.5 inches)64%extreme
June Weather19°C (67°F)8 mm (0.3 inches)56%extreme
July Weather24°C (75°F)11 mm (0.4 inches)44%extreme
August Weather23°C (73°F)11 mm (0.4 inches)34%extreme
September Weather18°C (64°F)8 mm (0.3 inches)41%very high
October Weather10°C (51°F)33 mm (1.3 inches)60%high
November Weather5°C (42°F)39 mm (1.5 inches)81%moderate
December Weather0°C (32°F)64 mm (2.5 inches)82%moderate

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