nomadseason

May Weather in Challis, United States

Last updated: June 24, 2025

In Challis, United States, the average temperature in May hovers around 6°C (44°F), with a notable range that can dip to a chilling -10°C (14°F) and occasionally reach a warm 25°C (78°F). This month brings about 68 mm (2.7 in) of precipitation spread over 15 days, resulting in a rather high average humidity of 83%. Be prepared for varied weather as you enjoy your time in this location!

May Temperature in Challis

In May in Challis, the average temperature is 6°C (44°F). The maximum can reach 25°C (78°F) and the minimum can be as low as -10°C (14°F). This variation in temperature makes Challis a destination for diverse activities, so travelers should be prepared for both warm days and chilly nights.

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

The chart illustrates May temperature patterns in Challis, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Challis, May typically has an average temperature of 6°C (44°F), with highs reaching up to 25°C (78°F) and lows dropping to around -10°C (14°F).
JanFebMarAprMayJunJulAugSepOctNovDec151827324355656353372716
Data source: Temperature data for Challis generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

May Precipitation in Challis

In Challis in May, the total precipitation amount is 68 mm (2.7 in) recorded over a span of 15 days.

May Precipitation Trends in Challis

The chart displays monthly precipitation patterns in Challis, 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 Challis, May typically receives around 68 mm (2.7 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec346541496859182330423438
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

May Humidity in Challis

In Challis in May, humidity is 83%. With an average temperature of 6°C (44°F), this humidity feels like a damp chill that seeps into your bones, making travel uncomfortable and potentially leading to a sense of heaviness in the air.

May Average Humidity in Challis

This chart illustrates the average monthly humidity levels in Challis, 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 Challis is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec94%93%91%87%83%80%75%66%66%77%92%96%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Challis

In Challis 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 Challis.

Maximum UV Index Levels in Challis for May

The chart shows the monthly maximum UV Index (UVI) for Challis 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 Challis typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3589111111109642
Data source: Challis 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 Challis Compares to Other Months

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

This table compares monthly weather conditions in Challis, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-9°C (16°F)34 mm (1.3 inches)94%moderate
February Weather-8°C (18°F)65 mm (2.6 inches)93%moderate
March Weather-3°C (27°F)40 mm (1.6 inches)91%very high
April Weather0°C (33°F)49 mm (1.9 inches)87%very high
May Weather6°C (44°F)68 mm (2.7 inches)83%extreme
June Weather13°C (55°F)59 mm (2.3 inches)80%extreme
July Weather18°C (65°F)18 mm (0.7 inches)75%extreme
August Weather17°C (63°F)23 mm (0.9 inches)66%very high
September Weather12°C (54°F)30 mm (1.2 inches)66%very high
October Weather3°C (37°F)42 mm (1.7 inches)77%high
November Weather-3°C (27°F)34 mm (1.3 inches)91%moderate
December Weather-9°C (16°F)38 mm (1.5 inches)96%low

Compare Challis's Climate with Cities Worldwide