August Weather in Lewistown, United States

Last updated: June 24, 2025

In August, the average temperature in Lewistown, United States hovers around 24°C (75°F), providing a comfortable climate for exploration. However, temperatures can vary significantly, with a minimum of 12°C (54°F) and a maximum reaching 36°C (96°F). Visitors should also be prepared for some rainfall, as 86 mm (3.4 in) of precipitation is expected over about 9 days. With an average humidity level of 77%, stay hydrated and enjoy all that this vibrant destination has to offer!

August Temperature in Lewistown

In August, in Lewistown, the average temperature is 24°C (75°F). The maximum can reach 36°C (96°F) and the minimum can be as low as 12°C (54°F). This makes Lewistown a great destination for travelers looking to enjoy warm weather while still having cooler evenings to relax.

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

The chart illustrates August 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, August typically has an average temperature of 24°C (75°F), with highs reaching up to 36°C (96°F) and lows dropping to around 12°C (54°F).

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

August Precipitation in Lewistown

In Lewistown in August, the precipitation amount is 86 mm (3.4 in), falling over the course of 9 days.

August Precipitation Trends in Lewistown

The chart displays monthly precipitation patterns in Lewistown, with values for each month alongside August’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how August’s conditions compare to those of other months. In Lewistown, August typically receives around 86 mm (3.4 inches) of precipitation spread over approximately 9 days.

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

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Millimeters (mm) Inches (in)

August Humidity in Lewistown

In Lewistown in August humidity is 77%. With an average temperature of 24°C (75°F), this humidity feels like a warm, enveloping blanket that can make outdoor activities feel stifling and may require frequent breaks to stay hydrated while exploring.

August Average Humidity in Lewistown

This chart illustrates the average monthly humidity levels in Lewistown, with August’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In August, average humidity in Lewistown is approximately 77%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in Lewistown

In Lewistown in August, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Lewistown.

Maximum UV Index Levels in Lewistown for August

The chart shows the monthly maximum UV Index (UVI) for Lewistown in August, 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 August, the maximum UV index in Lewistown typically reaches 9, which falls under the very high exposure category.

Data source: Lewistown August 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 August 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 August’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 August’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