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September Weather in Big Timber, United States

Last updated: June 24, 2025

In September, the average temperature in Big Timber, United States hovers around 13°C (56°F). Temperature fluctuations can be notable, with minimums dipping to -5°C (22°F) and maximums soaring to 34°C (94°F). Expect about 59 mm (2.3 in) of precipitation over 8 days, and with an average humidity of 67%, it’s a month where both warmth and moisture dance harmoniously.

September Temperature in Big Timber

In September in Big Timber, the average temperature is 13°C (56°F), with maximums reaching up to 34°C (94°F) and minimums dipping as low as -5°C (22°F). Travelers should be prepared for a wide range of temperatures and pack accordingly to enjoy their visit comfortably.

September Weather in Big Timber: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Big Timber, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Big Timber, September typically has an average temperature of 13°C (56°F), with highs reaching up to 34°C (94°F) and lows dropping to around -5°C (22°F).
JanFebMarAprMayJunJulAugSepOctNovDec221831374859676555403124
Data source: Temperature data for Big Timber 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 Big Timber

In Big Timber in September, the total precipitation amount is 59 mm (2.3 in) spread over 8 days.

September Precipitation Trends in Big Timber

The chart displays monthly precipitation patterns in Big Timber, 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 Big Timber, September typically receives around 59 mm (2.3 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec2460497811281353959604137
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Big Timber

In Big Timber in September humidity is 67%. With an average temperature of 13°C (56°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities a bit uncomfortable, but still manageable for travelers who embrace the cool, crisp air.

September Average Humidity in Big Timber

This chart illustrates the average monthly humidity levels in Big Timber, 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 Big Timber is approximately 67%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec93%92%90%83%79%76%74%69%67%72%89%94%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Big Timber

In Big Timber 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 Big Timber.

Maximum UV Index Levels in Big Timber for September

The chart shows the monthly maximum UV Index (UVI) for Big Timber 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 Big Timber typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579101110108632
Data source: Big Timber 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 Big Timber Compares to Other Months

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

This table compares monthly weather conditions in Big Timber, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (23°F)24 mm (0.9 inches)93%moderate
February Weather-8°C (18°F)60 mm (2.4 inches)92%moderate
March Weather-1°C (31°F)49 mm (1.9 inches)89%high
April Weather3°C (37°F)78 mm (3.1 inches)83%very high
May Weather9°C (48°F)112 mm (4.4 inches)79%very high
June Weather15°C (59°F)81 mm (3.2 inches)76%extreme
July Weather19°C (67°F)35 mm (1.4 inches)74%very high
August Weather18°C (65°F)39 mm (1.5 inches)69%very high
September Weather13°C (56°F)59 mm (2.3 inches)67%very high
October Weather4°C (40°F)60 mm (2.4 inches)72%high
November Weather-1°C (31°F)41 mm (1.6 inches)89%moderate
December Weather-5°C (24°F)37 mm (1.5 inches)94%low

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