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September Weather in Heart Butte, United States

Last updated: June 24, 2025

In September, the average temperature in Heart Butte, United States hovers around 11°C (53°F). However, be prepared for a temperature range that can swing from a chilly -6°C (21°F) to a warm 30°C (86°F). Rainfall isn't uncommon, with an average precipitation of 52 mm (2.1 in) spread over 7 days. With an average humidity of 69%, it's advisable to dress in layers and stay hydrated during your visit!

September Temperature in Heart Butte

In September in Heart Butte, the average temperature is 11°C (53°F). Maximum temperatures can reach 30°C (86°F), while minimums can drop as low as -6°C (21°F). Pack accordingly for a wide range of weather conditions during your travels!

September Weather in Heart Butte: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Heart Butte, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Heart Butte, September typically has an average temperature of 11°C (53°F), with highs reaching up to 30°C (86°F) and lows dropping to around -6°C (21°F).
JanFebMarAprMayJunJulAugSepOctNovDec231528354756646252383124
Data source: Temperature data for Heart Butte 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.

September Precipitation in Heart Butte

In Heart Butte in September, the precipitation amount is 52 mm (2.1 in) over the course of 7 days.

September Precipitation Trends in Heart Butte

The chart displays monthly precipitation patterns in Heart Butte, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Heart Butte, September typically receives around 52 mm (2.1 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec256039699781273152524843
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Heart Butte

In Heart Butte in September, humidity is 69%. With an average temperature of 11°C (53°F), this humidity feels like a damp embrace, making it essential for travelers to dress in layers and stay hydrated as they explore the sights.

September Average Humidity in Heart Butte

This chart illustrates the average monthly humidity levels in Heart Butte, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Heart Butte is approximately 69%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec93%91%88%84%78%77%79%69%69%78%87%94%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Heart Butte

In Heart Butte in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Heart Butte.

Maximum UV Index Levels in Heart Butte for September

The chart shows the monthly maximum UV Index (UVI) for Heart Butte in September, 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 September, the maximum UV index in Heart Butte typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec245899997532
Data source: Heart Butte September 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 September Weather in Heart Butte Compares to Other Months

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

This table compares monthly weather conditions in Heart Butte, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (23°F)25 mm (1.0 inches)93%low
February Weather-9°C (16°F)60 mm (2.4 inches)91%moderate
March Weather-2°C (29°F)39 mm (1.5 inches)88%moderate
April Weather2°C (35°F)69 mm (2.7 inches)84%very high
May Weather8°C (47°F)97 mm (3.8 inches)78%very high
June Weather13°C (56°F)81 mm (3.2 inches)77%very high
July Weather18°C (64°F)27 mm (1.1 inches)79%very high
August Weather17°C (62°F)31 mm (1.2 inches)69%very high
September Weather11°C (53°F)52 mm (2.1 inches)69%high
October Weather3°C (38°F)52 mm (2.1 inches)78%moderate
November Weather-1°C (31°F)48 mm (1.9 inches)87%moderate
December Weather-5°C (24°F)43 mm (1.7 inches)94%low

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