May Weather in Ketchum, United States

Last updated: June 24, 2025

In May, the average temperature in Ketchum, United States hovers around 4°C (40°F). Expect a range, with minimums dipping to -12°C (10°F) and maximums reaching a pleasant 24°C (75°F). Prepare for some moisture, as you can anticipate 61 mm (2.4 in) of precipitation over 13 days. The air will feel fairly comfortable with an average humidity of 66%.

May Temperature in Ketchum

In May in Ketchum, the average temperature is 4°C (40°F). The maximum can reach 24°C (75°F) and the minimum can be as low as -12°C (10°F). Travelers should be prepared for a wide range of temperatures and pack accordingly.

May Weather in Ketchum: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Ketchum, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Ketchum, May typically has an average temperature of 4°C (40°F), with highs reaching up to 24°C (75°F) and lows dropping to around -12°C (10°F).

Data source: Temperature data for Ketchum generated using information from the Copernicus Climate Change Service.

May Precipitation in Ketchum

In Ketchum in May, the precipitation amount is 61 mm (2.4 in) occurring over the course of 13 days.

May Precipitation Trends in Ketchum

The chart displays monthly precipitation patterns in Ketchum, 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 Ketchum, May typically receives around 61 mm (2.4 inches) of precipitation spread over approximately 13 days.

Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

May Humidity in Ketchum

In Ketchum in May, humidity is 66%. With an average temperature of 4°C (40°F), this humidity feels like a damp blanket wrapping around you, making your travels feel chillier and more uncomfortable, especially as the moisture settles in the air.

May Average Humidity in Ketchum

This chart illustrates the average monthly humidity levels in Ketchum, 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 Ketchum is approximately 66%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Ketchum

In Ketchum 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 Ketchum.

Maximum UV Index Levels in Ketchum for May

The chart shows the monthly maximum UV Index (UVI) for Ketchum 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 Ketchum typically reaches 11, which falls under the extreme exposure category.

Data source: Ketchum 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 Ketchum Compares to Other Months

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

This table compares monthly weather conditions in Ketchum, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-8°C (17°F)	56 mm (2.2 inches)	91%	moderate
February Weather	-8°C (18°F)	86 mm (3.4 inches)	92%	moderate
March Weather	-3°C (26°F)	60 mm (2.4 inches)	85%	very high
April Weather	0°C (31°F)	52 mm (2.0 inches)	76%	very high
May Weather	4°C (40°F)	61 mm (2.4 inches)	66%	extreme
June Weather	11°C (52°F)	46 mm (1.8 inches)	62%	extreme
July Weather	16°C (62°F)	15 mm (0.6 inches)	53%	extreme
August Weather	15°C (60°F)	33 mm (1.3 inches)	42%	very high
September Weather	10°C (51°F)	30 mm (1.2 inches)	46%	very high
October Weather	2°C (35°F)	42 mm (1.6 inches)	64%	high
November Weather	-4°C (26°F)	46 mm (1.8 inches)	83%	moderate
December Weather	-9°C (16°F)	49 mm (1.9 inches)	87%	moderate