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October Weather in Sun Valley, United States

Last updated: June 24, 2025

In October, the average temperature in Sun Valley, United States hovers around 10°C (51°F). Visitors can expect a minimum of -8°C (18°F) and a maximum of 29°C (85°F). Precipitation during this month averages 33 mm (1.3 in) over about 2 days, complemented by a comfortable average humidity of 60%.

October Temperature in Sun Valley

In October in Sun Valley, the average temperature is 10°C (51°F). Maximum temperatures can reach 29°C (85°F), while minimums can dip as low as -8°C (18°F). Be prepared for a wide range of temperatures when traveling during this month.

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

The chart illustrates October 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, October typically has an average temperature of 10°C (51°F), with highs reaching up to 29°C (85°F) and lows dropping to around -8°C (18°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.

October Precipitation in Sun Valley

In Sun Valley in October, the precipitation amount is 33 mm (1.3 in) over the course of 2 days.

October Precipitation Trends in Sun Valley

The chart displays monthly precipitation patterns in Sun Valley, with values for each month alongside October’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how October’s conditions compare to those of other months. In Sun Valley, October typically receives around 33 mm (1.3 inches) of precipitation spread over approximately 2 days.
JanFebMarAprMayJunJulAugSepOctNovDec9187713239811118333965
Data source: Precipitation data for October generated using information from the Copernicus Climate Change Service.
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October Humidity in Sun Valley

In Sun Valley in October humidity is 60%. With an average temperature of 10°C (51°F), this humidity feels like a brisk, damp chill that clings to your skin, prompting you to bundle up while exploring, but also inviting you to enjoy cozy cafés and warm meals during your travels.

October Average Humidity in Sun Valley

This chart illustrates the average monthly humidity levels in Sun Valley, with October’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In October, average humidity in Sun Valley is approximately 60%, 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 October generated using information from the Copernicus Climate Change Service.

October UV Index in Sun Valley

In Sun Valley in October, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Sun Valley.

Maximum UV Index Levels in Sun Valley for October

The chart shows the monthly maximum UV Index (UVI) for Sun Valley in October, 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 October, the maximum UV index in Sun Valley typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46891112121110743
Data source: Sun Valley October 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 October 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 October’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 October’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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