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October Weather in Lewistown, United States

Last updated: June 24, 2025

In October, the average temperature in Lewistown, United States hovers around 5°C (42°F). Expect extreme variations, with lows dipping to -17°C (1°F) and highs peaking at 28°C (82°F). Prepare for a relatively wet month, with 45 mm (1.8 in) of precipitation spread over 11 days. The air will be quite moist, boasting an average humidity level of 69%.

October Temperature in Lewistown

In October in Lewistown, the average temperature is 5°C (42°F), with maximums reaching 28°C (82°F) and minimums dropping as low as -17°C (1°F). Travelers should be prepared for a wide range of temperatures and pack accordingly.

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

The chart illustrates October temperature patterns in Lewistown, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Lewistown, October typically has an average temperature of 5°C (42°F), with highs reaching up to 28°C (82°F) and lows dropping to around -17°C (1°F).
JanFebMarAprMayJunJulAugSepOctNovDec251832385060696757413426
Data source: Temperature data for Lewistown 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 Lewistown

In Lewistown in October, the precipitation amount is 45 mm (1.8 in) over a span of 11 days.

October Precipitation Trends in Lewistown

The chart displays monthly precipitation patterns in Lewistown, 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 Lewistown, October typically receives around 45 mm (1.8 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec254329768480303145453431
Data source: Precipitation data for October generated using information from the Copernicus Climate Change Service.
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October Humidity in Lewistown

In Lewistown in October, humidity is 69%. With an average temperature of 5°C (42°F), this humidity feels like a chilly dampness that clings to your skin, making it essential to pack layers and a good rain jacket for your travels.

October Average Humidity in Lewistown

This chart illustrates the average monthly humidity levels in Lewistown, 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 Lewistown is approximately 69%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec81%85%77%72%75%78%79%76%67%69%78%85%
Data source: Humidity data for October generated using information from the Copernicus Climate Change Service.

October UV Index in Lewistown

In Lewistown in October, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Lewistown.

Maximum UV Index Levels in Lewistown for October

The chart shows the monthly maximum UV Index (UVI) for Lewistown 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 Lewistown typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24589101098532
Data source: Lewistown 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 Lewistown Compares to Other Months

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

This table compares monthly weather conditions in Lewistown, showing how October’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (25°F)25 mm (1.0 inches)81%low
February Weather-8°C (18°F)43 mm (1.7 inches)85%moderate
March Weather0°C (32°F)29 mm (1.2 inches)77%moderate
April Weather3°C (38°F)76 mm (3.0 inches)72%very high
May Weather10°C (50°F)84 mm (3.3 inches)75%very high
June Weather16°C (61°F)80 mm (3.2 inches)78%very high
July Weather20°C (69°F)30 mm (1.2 inches)79%very high
August Weather19°C (67°F)31 mm (1.2 inches)76%very high
September Weather14°C (57°F)45 mm (1.8 inches)67%very high
October Weather5°C (42°F)45 mm (1.8 inches)69%moderate
November Weather1°C (34°F)34 mm (1.3 inches)78%moderate
December Weather-3°C (27°F)31 mm (1.2 inches)85%low

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