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August Weather in Helena, United States

Last updated: June 24, 2025

In Helena, United States during August, the average temperature is a warm 26°C (80°F), with minimums dipping to 17°C (62°F) and soaring to maximums of 37°C (99°F). Expect around 122 mm (4.8 in) of precipitation spread over 14 days, accompanied by an average humidity of 72%. Ideal for those who enjoy a tropical climate!

August Temperature in Helena

In August in Helena, the average temperature is 26°C (80°F). The maximum can reach 37°C (99°F), while the minimum can drop to as low as 17°C (62°F). This varying climate makes it a great time for travelers to enjoy both warm days and cooler evenings.

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

The chart illustrates August temperature patterns in Helena, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Helena, August typically has an average temperature of 26°C (80°F), with highs reaching up to 37°C (99°F) and lows dropping to around 17°C (62°F).
JanFebMarAprMayJunJulAugSepOctNovDec475358637277808077685350
Data source: Temperature data for Helena 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 Helena

In Helena in August, the total precipitation amount is 122 mm (4.8 in) over the course of 14 days.

August Precipitation Trends in Helena

The chart displays monthly precipitation patterns in Helena, 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 Helena, August typically receives around 122 mm (4.8 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec1121551341401081471231228513283142
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in Helena

In Helena in August, humidity is 72%. With an average temperature of 26°C (80°F), this humidity feels like a warm embrace, making traveling feel a bit heavier, yet invigorating as you navigate the vibrant atmosphere, surrounded by the rich scents and lively sounds of the locale.

August Average Humidity in Helena

This chart illustrates the average monthly humidity levels in Helena, 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 Helena is approximately 72%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%84%82%82%81%77%77%72%73%73%85%88%
Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in Helena

In Helena in August, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Helena.

Maximum UV Index Levels in Helena for August

The chart shows the monthly maximum UV Index (UVI) for Helena 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 Helena typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec47810111111119864
Data source: Helena 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 Helena Compares to Other Months

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

This table compares monthly weather conditions in Helena, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather8°C (47°F)112 mm (4.4 inches)85%moderate
February Weather11°C (53°F)155 mm (6.1 inches)84%high
March Weather15°C (59°F)134 mm (5.3 inches)82%very high
April Weather17°C (64°F)140 mm (5.5 inches)82%very high
May Weather22°C (73°F)108 mm (4.2 inches)81%extreme
June Weather25°C (78°F)147 mm (5.8 inches)77%extreme
July Weather27°C (81°F)122 mm (4.8 inches)77%extreme
August Weather26°C (80°F)122 mm (4.8 inches)72%extreme
September Weather25°C (77°F)85 mm (3.3 inches)73%very high
October Weather20°C (68°F)132 mm (5.2 inches)73%very high
November Weather12°C (54°F)83 mm (3.3 inches)85%high
December Weather10°C (50°F)142 mm (5.6 inches)88%moderate

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