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August Weather in Sun Valley, United States

Last updated: June 24, 2025

In August, the average temperature in Sun Valley, United States is a pleasant 23°C (73°F). While the minimum can drop to a brisk 8°C (47°F), the mercury can rise to a sizzling 37°C (98°F). Expect 11 mm (0.4 in) of precipitation spread over 3 days, and enjoy the comfortably low average humidity of 34%.

August Temperature in Sun Valley

In August in Sun Valley, the average temperature is 23°C (73°F). Maximums can reach 37°C (98°F) and minimums can be as low as 8°C (47°F). This makes Sun Valley a delightful destination for travelers looking to enjoy warm weather, while also being prepared for 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 23°C (73°F), with highs reaching up to 37°C (98°F) and lows dropping to around 8°C (47°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.

August Precipitation in Sun Valley

In Sun Valley in August, the precipitation amount is 11 mm (0.4 in) over the course of 3 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 11 mm (0.4 inches) of precipitation spread over approximately 3 days.
JanFebMarAprMayJunJulAugSepOctNovDec9187713239811118333965
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 34%. With an average temperature of 23°C (73°F), this humidity feels like a pleasant embrace, making it ideal for exploring outdoor attractions and enjoying leisurely strolls without the overwhelming discomfort often associated with high humidity.

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 34%, 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 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.
JanFebMarAprMayJunJulAugSepOctNovDec46891112121110743
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 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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