September Weather in Wyoming, United States

Last updated: June 24, 2025

The average temperature in Wyoming, United States during September hovers around 22°C (73°F), making it a delightful time to visit. Temperatures can swing from a cool 11°C (51°F) to a warm 33°C (91°F). Expect some rain, with a total precipitation of 103 mm (4.1 in) spread over 11 days. With an average humidity of 75%, the air can feel quite refreshing!

September Temperature in Wyoming

In September in Wyoming, the average temperature is 22°C (73°F). Maximums can reach 33°C (91°F), while minimums can drop to as low as 11°C (51°F). This diverse temperature range makes Wyoming an ideal destination for travelers seeking pleasant weather and comfortable outdoor activities.

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

The chart illustrates September temperature patterns in Wyoming, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Wyoming, September typically has an average temperature of 22°C (73°F), with highs reaching up to 33°C (91°F) and lows dropping to around 11°C (51°F).

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

September Precipitation in Wyoming

In Wyoming in September, the precipitation amount is 103 mm (4.1 in) spread over 11 days.

September Precipitation Trends in Wyoming

The chart displays monthly precipitation patterns in Wyoming, 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 Wyoming, September typically receives around 103 mm (4.1 inches) of precipitation spread over approximately 11 days.

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

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Millimeters (mm) Inches (in)

September Humidity in Wyoming

In Wyoming in September humidity is 75%. With an average temperature of 22°C (73°F), this humidity feels like a warm, enveloping embrace, making it essential for travelers to stay hydrated and wear light, breathable clothing to enjoy their adventures comfortably.

September Average Humidity in Wyoming

This chart illustrates the average monthly humidity levels in Wyoming, 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 Wyoming is approximately 75%, 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 Wyoming

In Wyoming 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 Wyoming.

Maximum UV Index Levels in Wyoming for September

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

Data source: Wyoming 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 Wyoming Compares to Other Months

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

This table compares monthly weather conditions in Wyoming, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	3°C (38°F)	63 mm (2.5 inches)	84%	moderate
February Weather	5°C (41°F)	104 mm (4.1 inches)	83%	moderate
March Weather	8°C (46°F)	104 mm (4.1 inches)	83%	high
April Weather	13°C (56°F)	93 mm (3.7 inches)	81%	very high
May Weather	18°C (65°F)	128 mm (5.1 inches)	78%	very high
June Weather	23°C (74°F)	107 mm (4.2 inches)	79%	very high
July Weather	26°C (80°F)	152 mm (6.0 inches)	74%	very high
August Weather	25°C (78°F)	179 mm (7.0 inches)	72%	very high
September Weather	22°C (73°F)	103 mm (4.1 inches)	75%	very high
October Weather	17°C (64°F)	128 mm (5.0 inches)	81%	high
November Weather	10°C (50°F)	83 mm (3.3 inches)	85%	moderate
December Weather	6°C (43°F)	103 mm (4.0 inches)	84%	moderate