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August Weather in Lewistown, United States

Last updated: June 24, 2025

In August, the average temperature in Lewistown, United States hovers around 23°C (74°F), making it a pleasant time to enjoy the surroundings. Visitors can expect temperatures to range from a cool 13°C (55°F) to a warm 35°C (95°F). During this month, precipitation averages 102 mm (4.0 in), typically spread over 12 days, while the average humidity rests at a comfortable 64%.

August Temperature in Lewistown

In August in Lewistown, the average temperature is 23°C (74°F). Maximum can reach 35°C (95°F) and minimum can be as low as 13°C (55°F). This pleasant climate makes Lewistown an ideal destination for travelers looking to enjoy outdoor activities and explore the local attractions.

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 23°C (74°F), with highs reaching up to 35°C (95°F) and lows dropping to around 13°C (55°F).
JanFebMarAprMayJunJulAugSepOctNovDec313441516270767467574236
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.

August Precipitation in Lewistown

In Lewistown in August, the total precipitation amount is 102 mm (4.0 in), occurring over a span of 12 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 102 mm (4.0 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec65105941021201011211021291138591
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in Lewistown

In Lewistown in August, humidity is 64%. With an average temperature of 23°C (74°F), this humidity feels like a warm blanket wrapping around you, making outdoor exploration enjoyable yet slightly sticky, so it's best to stay hydrated and take breaks in the shade while traveling.

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 64%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%90%89%88%80%79%74%64%67%81%89%88%
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.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098642
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.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (31°F)65 mm (2.6 inches)89%moderate
February Weather1°C (34°F)104 mm (4.1 inches)90%moderate
March Weather5°C (41°F)94 mm (3.7 inches)89%high
April Weather11°C (51°F)102 mm (4.0 inches)88%very high
May Weather17°C (62°F)120 mm (4.7 inches)80%very high
June Weather21°C (71°F)101 mm (4.0 inches)79%very high
July Weather24°C (76°F)121 mm (4.8 inches)74%very high
August Weather23°C (74°F)102 mm (4.0 inches)64%very high
September Weather20°C (68°F)129 mm (5.1 inches)67%very high
October Weather14°C (57°F)113 mm (4.5 inches)81%high
November Weather6°C (42°F)85 mm (3.3 inches)89%moderate
December Weather2°C (36°F)91 mm (3.6 inches)88%low

Compare Lewistown's Climate with Cities Worldwide