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August Weather in Sun Valley, United States

Last updated: June 24, 2025

The average temperature in Sun Valley, United States in August is a pleasant 24°C (75°F), making it an ideal time to explore the area. Expect temperatures to range from a cool 11°C (53°F) to a scorching 38°C (100°F). During this month, you'll encounter around 50 mm (1.9 in) of precipitation spread over 12 days, contributing to an average humidity of 41%. Enjoy the diverse weather while planning your adventures!

August Temperature in Sun Valley

In August in Sun Valley, the average temperature is 24°C (75°F). The maximum can reach 38°C (100°F), and the minimum can be as low as 11°C (53°F). Travelers should prepare for a warm climate with the possibility of cooler evenings.

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

The chart illustrates August 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, August typically has an average temperature of 24°C (75°F), with highs reaching up to 38°C (100°F) and lows dropping to around 11°C (53°F).
JanFebMarAprMayJunJulAugSepOctNovDec394146566375767570584941
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.

August Precipitation in Sun Valley

In Sun Valley in August, the precipitation amount is 50 mm (1.9 in) over the course of 12 days.

August Precipitation Trends in Sun Valley

The chart displays monthly precipitation patterns in Sun Valley, with values for each month alongside August’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how August’s conditions compare to those of other months. In Sun Valley, August typically receives around 50 mm (1.9 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec648065111771115036363252
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in Sun Valley

In Sun Valley in August humidity is 41%. With an average temperature of 24°C (75°F), this humidity feels like a pleasant embrace that enhances the warmth, making it ideal for leisurely strolls and outdoor adventures without the overwhelming stickiness often associated with higher humidity levels.

August Average Humidity in Sun Valley

This chart illustrates the average monthly humidity levels in Sun Valley, with August’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In August, average humidity in Sun Valley is approximately 41%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%83%72%63%46%35%33%41%59%70%79%82%
Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in Sun Valley

In Sun Valley in August, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Sun Valley.

Maximum UV Index Levels in Sun Valley for August

The chart shows the monthly maximum UV Index (UVI) for Sun Valley in August, 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 August, the maximum UV index in Sun Valley typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec479111213121111865
Data source: Sun Valley August 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 August 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 August’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 August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather4°C (40°F)64 mm (2.5 inches)80%moderate
February Weather5°C (41°F)80 mm (3.1 inches)83%high
March Weather8°C (47°F)64 mm (2.5 inches)72%very high
April Weather13°C (56°F)11 mm (0.4 inches)63%extreme
May Weather17°C (63°F)17 mm (0.7 inches)46%extreme
June Weather24°C (75°F)7 mm (0.3 inches)35%extreme
July Weather24°C (76°F)111 mm (4.4 inches)33%extreme
August Weather24°C (75°F)50 mm (1.9 inches)41%extreme
September Weather21°C (70°F)36 mm (1.4 inches)59%extreme
October Weather15°C (59°F)36 mm (1.4 inches)70%very high
November Weather10°C (50°F)32 mm (1.3 inches)79%high
December Weather5°C (41°F)51 mm (2.0 inches)82%moderate

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