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May Weather in Lake Ketchum, United States

Last updated: June 24, 2025

The average temperature in Lake Ketchum, United States for the month of May is a mild 13°C (55°F). Expect variation, as temperatures can dip to a chilly 3°C (38°F) at night and rise to a warm 27°C (81°F) during the day. This month also brings an average precipitation of 83 mm (3.3 in) over about 12 days, contributing to an average humidity of 82%.

May Temperature in Lake Ketchum

In May in Lake Ketchum, the average temperature is 13°C (55°F). Maximum temperatures can reach 27°C (81°F), while minimum temperatures can drop to as low as 3°C (38°F). This variation makes it advisable to pack layers for your travels, ensuring you're prepared for both warm days and cooler evenings.

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

The chart illustrates May temperature patterns in Lake Ketchum, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Lake Ketchum, May typically has an average temperature of 13°C (55°F), with highs reaching up to 27°C (81°F) and lows dropping to around 3°C (38°F).
JanFebMarAprMayJunJulAugSepOctNovDec403844495560646459494439
Data source: Temperature data for Lake Ketchum 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 Lake Ketchum

In Lake Ketchum in May, the precipitation amount is 83 mm (3.3 in) distributed over the course of 12 days.

May Precipitation Trends in Lake Ketchum

The chart displays monthly precipitation patterns in Lake 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 Lake Ketchum, May typically receives around 83 mm (3.3 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec21722217914583752226127204274255
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Lake Ketchum

In Lake Ketchum in May, humidity is 82%. With an average temperature of 13°C (55°F), this humidity feels like a heavy blanket wrapping around you, making outdoor activities sticky and uncomfortable for traveling.

May Average Humidity in Lake Ketchum

This chart illustrates the average monthly humidity levels in Lake 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 Lake Ketchum is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%86%88%86%82%82%85%77%76%88%88%89%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Lake Ketchum

In Lake Ketchum in May, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Lake Ketchum.

Maximum UV Index Levels in Lake Ketchum for May

The chart shows the monthly maximum UV Index (UVI) for Lake 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 Lake Ketchum typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235689987522
Data source: Lake 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 Lake Ketchum Compares to Other Months

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

This table compares monthly weather conditions in Lake Ketchum, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (40°F)217 mm (8.5 inches)87%low
February Weather4°C (39°F)222 mm (8.7 inches)86%moderate
March Weather6°C (44°F)179 mm (7.0 inches)88%moderate
April Weather9°C (49°F)145 mm (5.7 inches)86%high
May Weather13°C (55°F)83 mm (3.3 inches)82%very high
June Weather15°C (60°F)75 mm (2.9 inches)82%very high
July Weather18°C (64°F)22 mm (0.9 inches)85%very high
August Weather18°C (65°F)26 mm (1.0 inches)77%very high
September Weather15°C (60°F)127 mm (5.0 inches)76%high
October Weather10°C (50°F)204 mm (8.0 inches)88%moderate
November Weather7°C (45°F)274 mm (10.8 inches)88%low
December Weather4°C (40°F)255 mm (10.0 inches)89%low

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