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September Weather in Belle Fourche, United States

Last updated: June 24, 2025

In September, the average temperature in Belle Fourche, United States hovers around 17°C (63°F). While the mercury can occasionally dip to a brisk -1°C (31°F), it can also soar to a sizzling 39°C (102°F). Expect some rainfall, with a total precipitation of 33 mm (1.3 in) spread over 6 days. Overall, the atmosphere is quite humid, boasting an average humidity of 77%.

September Temperature in Belle Fourche

In September in Belle Fourche, the average temperature is 17°C (63°F). Maximums can reach 39°C (102°F), while minimums can drop to as low as -1°C (31°F). Be prepared for a wide range of temperatures and pack accordingly when visiting during this month.

September Weather in Belle Fourche: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Belle Fourche, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Belle Fourche, September typically has an average temperature of 17°C (63°F), with highs reaching up to 39°C (102°F) and lows dropping to around -1°C (31°F).
JanFebMarAprMayJunJulAugSepOctNovDec262136435569757263463730
Data source: Temperature data for Belle Fourche 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 Belle Fourche

In Belle Fourche, in September, the precipitation amount is 33 mm (1.3 in) over the course of 6 days.

September Precipitation Trends in Belle Fourche

The chart displays monthly precipitation patterns in Belle Fourche, 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 Belle Fourche, September typically receives around 33 mm (1.3 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec142628596944603633491322
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Belle Fourche

In Belle Fourche in September, humidity is 77%. With an average temperature of 17°C (63°F), this humidity feels like a cozy blanket wrapped around you, creating a muggy atmosphere that can be a bit uncomfortable for traveling, making you want to seek shade and hydration as you explore.

September Average Humidity in Belle Fourche

This chart illustrates the average monthly humidity levels in Belle Fourche, 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 Belle Fourche is approximately 77%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec78%80%70%70%76%84%85%85%77%73%74%79%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Belle Fourche

In Belle Fourche in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Belle Fourche.

Maximum UV Index Levels in Belle Fourche for September

The chart shows the monthly maximum UV Index (UVI) for Belle Fourche 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 Belle Fourche typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec245991010108532
Data source: Belle Fourche 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 Belle Fourche Compares to Other Months

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

This table compares monthly weather conditions in Belle Fourche, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (26°F)14 mm (0.6 inches)77%low
February Weather-6°C (22°F)25 mm (1.0 inches)80%moderate
March Weather2°C (36°F)28 mm (1.1 inches)70%moderate
April Weather6°C (43°F)59 mm (2.3 inches)70%very high
May Weather13°C (55°F)69 mm (2.7 inches)76%very high
June Weather21°C (69°F)44 mm (1.7 inches)84%very high
July Weather24°C (75°F)60 mm (2.4 inches)85%very high
August Weather22°C (72°F)36 mm (1.4 inches)84%very high
September Weather17°C (63°F)33 mm (1.3 inches)77%very high
October Weather8°C (46°F)49 mm (1.9 inches)73%moderate
November Weather3°C (38°F)13 mm (0.5 inches)74%moderate
December Weather-1°C (30°F)22 mm (0.8 inches)79%low

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