September Weather in Bridger, United States

Last updated: June 24, 2025

In September, the average temperature in Bridger, United States is a comfortable 15°C (59°F). However, be prepared for a range of temperatures, with minimums dipping to -2°C (29°F) and maximums soaring to 35°C (95°F). Expect about 55 mm (2.2 in) of precipitation spread over 6 days, and enjoy a relatively high average humidity of 76%, adding to the overall atmosphere.

September Temperature in Bridger

In September in Bridger, the average temperature is 15°C (59°F). Maximum temperatures can reach 35°C (95°F), while minimums can dip as low as -2°C (29°F). Visitors should be prepared for a wide range of temperatures and pack accordingly for their trip.

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

The chart illustrates September temperature patterns in Bridger, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Bridger, September typically has an average temperature of 15°C (59°F), with highs reaching up to 35°C (95°F) and lows dropping to around -2°C (29°F).

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

September Precipitation in Bridger

In Bridger in September, the total precipitation amount is 55 mm (2.2 in) spread over 6 days.

September Precipitation Trends in Bridger

The chart displays monthly precipitation patterns in Bridger, 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 Bridger, September typically receives around 55 mm (2.2 inches) of precipitation spread over approximately 6 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 Bridger

In Bridger in September humidity is 76%. With an average temperature of 15°C (59°F), this humidity feels like a heavy blanket wrapping around you, making outdoor activities less enjoyable and often leading to a quick sense of fatigue while traveling.

September Average Humidity in Bridger

This chart illustrates the average monthly humidity levels in Bridger, 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 Bridger is approximately 76%, 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 Bridger

In Bridger 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 Bridger.

Maximum UV Index Levels in Bridger for September

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

Data source: Bridger 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 Bridger Compares to Other Months

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

This table compares monthly weather conditions in Bridger, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-5°C (24°F)	18 mm (0.7 inches)	85%	moderate
February Weather	-7°C (19°F)	39 mm (1.5 inches)	85%	moderate
March Weather	1°C (35°F)	39 mm (1.5 inches)	79%	high
April Weather	5°C (41°F)	71 mm (2.8 inches)	74%	very high
May Weather	11°C (52°F)	83 mm (3.3 inches)	76%	very high
June Weather	17°C (63°F)	81 mm (3.2 inches)	79%	extreme
July Weather	21°C (70°F)	40 mm (1.6 inches)	81%	extreme
August Weather	20°C (68°F)	29 mm (1.1 inches)	80%	very high
September Weather	15°C (59°F)	55 mm (2.2 inches)	76%	very high
October Weather	5°C (42°F)	53 mm (2.1 inches)	74%	high
November Weather	0°C (33°F)	31 mm (1.2 inches)	81%	moderate
December Weather	-4°C (26°F)	27 mm (1.0 inches)	87%	low