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May Weather in Sun Valley, United States

Last updated: June 24, 2025

In May, the average temperature in Sun Valley, United States hovers around 13°C (55°F). Expect a minimum of -7°C (19°F) and a maximum of 32°C (90°F), making it a month of varied weather. With an average precipitation of 39 mm (1.5 in) spread over 8 days, you'll want to keep your umbrella handy. Humidity levels are at a moderate 64%, adding a bit of mugginess to the air.

May Temperature in Sun Valley

In May in Sun Valley, the average temperature is 13°C (55°F), with maximums reaching 32°C (90°F) and minimums plummeting to as low as -7°C (19°F). Travelers should be prepared for a wide range of temperatures during this time.

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

The chart illustrates May 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, May typically has an average temperature of 13°C (55°F), with highs reaching up to 32°C (90°F) and lows dropping to around -7°C (19°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.

May Precipitation in Sun Valley

In Sun Valley in May, the precipitation amount is 39 mm (1.5 in) over the course of 8 days.

May Precipitation Trends in Sun Valley

The chart displays monthly precipitation patterns in Sun Valley, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In Sun Valley, May typically receives around 39 mm (1.5 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec9187713239811118333965
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Sun Valley

In Sun Valley in May, humidity is 64%. With an average temperature of 13°C (55°F), this humidity feels like a cool, refreshing embrace that makes exploring the area both invigorating and comfortable, perfect for leisurely strolls and outdoor adventures.

May Average Humidity in Sun Valley

This chart illustrates the average monthly humidity levels in Sun Valley, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in Sun Valley is approximately 64%, 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 May generated using information from the Copernicus Climate Change Service.

May UV Index in Sun Valley

In Sun Valley in May, 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 May

The chart shows the monthly maximum UV Index (UVI) for Sun Valley in May, 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 May, the maximum UV index in Sun Valley typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46891112121110743
Data source: Sun Valley May 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 May 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 May’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 May’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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