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October Weather in Challis, United States

Last updated: June 24, 2025

In October, the average temperature in Challis, United States hovers around 3°C (37°F), with fluctuations that range from a chilly -21°C (-5°F) to a warm 24°C (75°F). Expect about 42 mm (1.7 in) of precipitation spread over 9 days, complemented by an average humidity level of 77%. Prepare for a month that captures the diverse essence of weather!

October Temperature in Challis

In October in Challis, the average temperature is 3°C (37°F). Maximum temperatures can reach 24°C (75°F), while the minimum can drop as low as -21°C (-5°F). Be sure to pack accordingly for a wide range of temperatures when traveling to Challis during this month.

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

The chart illustrates October 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, October typically has an average temperature of 3°C (37°F), with highs reaching up to 24°C (75°F) and lows dropping to around -21°C (-5°F).
JanFebMarAprMayJunJulAugSepOctNovDec151827324355656353372716
Data source: Temperature data for Challis 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 Challis

In Challis in October, the precipitation amount is 42 mm (1.7 in) spread over 9 days.

October Precipitation Trends in Challis

The chart displays monthly precipitation patterns in Challis, 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 Challis, October typically receives around 42 mm (1.7 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec346541496859182330423438
Data source: Precipitation data for October generated using information from the Copernicus Climate Change Service.
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October Humidity in Challis

In Challis in October, humidity is 77%. With an average temperature of 3°C (37°F), this humidity feels like a damp chill settling in, making travel uncomfortable as the moisture seeps into your clothes and lingers on your skin, turning each step into a reminder of the cold, clammy atmosphere.

October Average Humidity in Challis

This chart illustrates the average monthly humidity levels in Challis, 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 Challis is approximately 77%, 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 October generated using information from the Copernicus Climate Change Service.

October UV Index in Challis

In Challis in October, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Challis, you can refer to this Hourly UV Index in Challis.

Maximum UV Index Levels in Challis for October

The chart shows the monthly maximum UV Index (UVI) for Challis 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 Challis typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3589111111109642
Data source: Challis 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 Challis Compares to Other Months

Weather in Challis varies notably across the year, with each month offering distinct climate conditions. This page compares October’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 October’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

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