October Weather in Lewistown, United States

Last updated: June 24, 2025

In October, the average temperature in Lewistown, United States hovers around 13°C (56°F). However, temperatures can fluctuate dramatically, ranging from a chilly -4°C (25°F) to a scorching 32°C (90°F). Expect an average precipitation of 117 mm (4.6 in) spread over about 12 days, and a cozy average humidity of 78% to round out the experience.

October Temperature in Lewistown

In October in Lewistown, the average temperature is 13°C (56°F). Maximum temperatures can reach up to 32°C (90°F), while minimums can drop as low as -4°C (25°F). This variability makes it essential for travelers to prepare for both warm and chilly conditions during their visit.

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 13°C (56°F), with highs reaching up to 32°C (90°F) and lows dropping to around -4°C (25°F).

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

October Precipitation in Lewistown

In Lewistown in October, the total precipitation amount is 117 mm (4.6 in), occurring over a span of 12 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 117 mm (4.6 inches) of precipitation spread over approximately 12 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

October Humidity in Lewistown

In Lewistown in October, humidity is 78%. With an average temperature of 13°C (56°F), this humidity feels like a damp chill that can make outdoor activities a bit uncomfortable, creating a heavy atmosphere that clings to the skin, urging travelers to dress in layers for warmth and comfort.

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 78%, offering insight into how humid the weather typically is during this month.

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 is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Lewistown, you can refer to this 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 6, which falls under the high exposure category.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	-3°C (27°F)	60 mm (2.4 inches)	81%	moderate
February Weather	-1°C (30°F)	68 mm (2.7 inches)	81%	moderate
March Weather	6°C (42°F)	121 mm (4.8 inches)	81%	high
April Weather	11°C (51°F)	108 mm (4.3 inches)	82%	very high
May Weather	18°C (64°F)	169 mm (6.7 inches)	78%	very high
June Weather	24°C (75°F)	152 mm (6.0 inches)	81%	extreme
July Weather	25°C (78°F)	103 mm (4.0 inches)	79%	very high
August Weather	24°C (75°F)	86 mm (3.4 inches)	77%	very high
September Weather	21°C (70°F)	74 mm (2.9 inches)	78%	very high
October Weather	13°C (56°F)	117 mm (4.6 inches)	78%	high
November Weather	5°C (41°F)	57 mm (2.2 inches)	87%	moderate
December Weather	1°C (35°F)	52 mm (2.0 inches)	84%	low