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August Weather in Helena Valley Northwest, United States

Last updated: June 24, 2025

In August, the average temperature in Helena Valley Northwest, United States hovers around 20°C (67°F), with minimum temperatures dipping to 4°C (39°F) and maxing out at 37°C (99°F). Expect a precipitation amount of around 23 mm (0.9 in) over the course of 3 days, and enjoy a comfortable average humidity level of 71%.

August Temperature in Helena Valley Northwest

In August in Helena Valley Northwest, the average temperature is 20°C (67°F). Maximums can reach 37°C (99°F) and minimums can be as low as 4°C (39°F). This range makes Helena Valley Northwest an ideal destination for travelers seeking a mix of warm days and cooler evenings.

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

The chart illustrates August temperature patterns in Helena Valley Northwest, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Helena Valley Northwest, August typically has an average temperature of 20°C (67°F), with highs reaching up to 37°C (99°F) and lows dropping to around 4°C (39°F).
JanFebMarAprMayJunJulAugSepOctNovDec211831385060696757413224
Data source: Temperature data for Helena Valley Northwest 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 Valley Northwest

In Helena Valley Northwest in August, the precipitation amount is 23 mm (0.9 in) over the course of 3 days.

August Precipitation Trends in Helena Valley Northwest

The chart displays monthly precipitation patterns in Helena Valley Northwest, 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 Valley Northwest, August typically receives around 23 mm (0.9 inches) of precipitation spread over approximately 3 days.
JanFebMarAprMayJunJulAugSepOctNovDec194430596478172337352930
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in Helena Valley Northwest

In Helena Valley Northwest in August humidity is 71%. With an average temperature of 20°C (67°F), this humidity feels like a warm, enveloping embrace that can make outdoor activities feel a bit sticky, urging travelers to stay hydrated and seek shade during the hottest parts of the day.

August Average Humidity in Helena Valley Northwest

This chart illustrates the average monthly humidity levels in Helena Valley Northwest, 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 Valley Northwest is approximately 71%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%88%83%78%76%78%77%71%68%72%84%91%
Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in Helena Valley Northwest

In Helena Valley Northwest 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 Helena Valley Northwest.

Maximum UV Index Levels in Helena Valley Northwest for August

The chart shows the monthly maximum UV Index (UVI) for Helena Valley Northwest 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 Valley Northwest typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34689101098532
Data source: Helena Valley Northwest 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 Valley Northwest Compares to Other Months

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

This table compares monthly weather conditions in Helena Valley Northwest, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (22°F)19 mm (0.7 inches)87%moderate
February Weather-8°C (18°F)44 mm (1.7 inches)88%moderate
March Weather-1°C (31°F)30 mm (1.2 inches)83%high
April Weather4°C (39°F)59 mm (2.3 inches)78%very high
May Weather10°C (51°F)64 mm (2.5 inches)76%very high
June Weather16°C (60°F)78 mm (3.1 inches)78%very high
July Weather21°C (69°F)17 mm (0.7 inches)77%very high
August Weather20°C (67°F)23 mm (0.9 inches)71%very high
September Weather14°C (57°F)37 mm (1.5 inches)68%very high
October Weather5°C (41°F)35 mm (1.4 inches)72%moderate
November Weather0°C (32°F)29 mm (1.1 inches)84%moderate
December Weather-4°C (25°F)30 mm (1.2 inches)90%low

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