September Weather in Bison, United States

Last updated: June 24, 2025

In September, the average temperature in Bison, United States is a comfortable 17°C (62°F). However, temperatures can vary significantly, ranging from a chilly -1°C (30°F) at the lowest to a warm 35°C (95°F) at the highest. Expect around 38 mm (1.5 in) of precipitation spread over 5 days during this period, contributing to an average humidity of 77%. Whether you're planning indoor activities or outdoor adventures, this month offers a dynamic climate to enjoy!

September Temperature in Bison

In September in Bison, the average temperature is 17°C (62°F), with maximums reaching up to 35°C (95°F) and minimums dipping as low as -1°C (30°F). Be prepared for a range of temperatures to ensure a comfortable travel experience.

September Weather in Bison: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Bison, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Bison, September typically has an average temperature of 17°C (62°F), with highs reaching up to 35°C (95°F) and lows dropping to around -1°C (30°F).

Data source: Temperature data for Bison generated using information from the Copernicus Climate Change Service.

September Precipitation in Bison

In Bison in September, the total precipitation amount is 38 mm (1.5 in) spread over a duration of 5 days.

September Precipitation Trends in Bison

The chart displays monthly precipitation patterns in Bison, 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 Bison, September typically receives around 38 mm (1.5 inches) of precipitation spread over approximately 5 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Bison

In Bison in September humidity is 77%. With an average temperature of 17°C (62°F), this humidity feels like a warm embrace, creating a lush, almost tropical atmosphere that can be quite stifling for traveling, making it essential to stay hydrated and take frequent breaks in the shade.

September Average Humidity in Bison

This chart illustrates the average monthly humidity levels in Bison, 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 Bison is approximately 77%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Bison

In Bison 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 Bison.

Maximum UV Index Levels in Bison for September

The chart shows the monthly maximum UV Index (UVI) for Bison 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 Bison typically reaches 8, which falls under the very high exposure category.

Data source: Bison 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 Bison Compares to Other Months

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

This table compares monthly weather conditions in Bison, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-6°C (21°F)	11 mm (0.4 inches)	77%	low
February Weather	-8°C (17°F)	18 mm (0.7 inches)	80%	moderate
March Weather	0°C (33°F)	27 mm (1.1 inches)	70%	moderate
April Weather	5°C (42°F)	53 mm (2.1 inches)	70%	very high
May Weather	13°C (55°F)	80 mm (3.1 inches)	76%	very high
June Weather	21°C (69°F)	46 mm (1.8 inches)	84%	very high
July Weather	24°C (75°F)	64 mm (2.5 inches)	85%	very high
August Weather	22°C (71°F)	54 mm (2.1 inches)	84%	very high
September Weather	17°C (62°F)	38 mm (1.5 inches)	77%	very high
October Weather	7°C (45°F)	54 mm (2.1 inches)	73%	moderate
November Weather	1°C (35°F)	12 mm (0.5 inches)	74%	moderate
December Weather	-3°C (27°F)	21 mm (0.8 inches)	79%	low