September Weather in Gunnison, United States

Last updated: June 24, 2025

In September, the average temperature in Gunnison, United States is a mild 18°C (64°F). However, prepare for a significant range: temperatures can dip as low as -8°C (18°F) or soar to a warm 34°C (94°F). Expect moderate precipitation of 18 mm (0.7 in) spread across about 3 days, with an average humidity level of 47%.

September Temperature in Gunnison

In September in Gunnison, the average temperature is 18°C (64°F). Maximums can reach 34°C (94°F) and minimums can be as low as -8°C (18°F). Prepare for a diverse range of weather conditions if you're planning to travel during this time.

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

The chart illustrates September temperature patterns in Gunnison, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Gunnison, September typically has an average temperature of 18°C (64°F), with highs reaching up to 34°C (94°F) and lows dropping to around -8°C (18°F).

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

September Precipitation in Gunnison

In Gunnison in September, the precipitation amount is 18 mm (0.7 in) over a span of 3 days.

September Precipitation Trends in Gunnison

The chart displays monthly precipitation patterns in Gunnison, 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 Gunnison, September typically receives around 18 mm (0.7 inches) of precipitation spread over approximately 3 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 Gunnison

In Gunnison in September, humidity is 47%. With an average temperature of 18°C (64°F), this humidity feels pleasantly comfortable for traveling, creating a refreshing ambiance that’s ideal for exploring the sights without feeling overly sticky or uncomfortable.

September Average Humidity in Gunnison

This chart illustrates the average monthly humidity levels in Gunnison, 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 Gunnison is approximately 47%, 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 Gunnison

In Gunnison in September, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Gunnison.

Maximum UV Index Levels in Gunnison for September

The chart shows the monthly maximum UV Index (UVI) for Gunnison 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 Gunnison typically reaches 10, which falls under the very high exposure category.

Data source: Gunnison 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 Gunnison Compares to Other Months

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

This table compares monthly weather conditions in Gunnison, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-4°C (25°F)	45 mm (1.8 inches)	87%	moderate
February Weather	-3°C (28°F)	51 mm (2.0 inches)	88%	high
March Weather	2°C (36°F)	54 mm (2.1 inches)	77%	very high
April Weather	7°C (45°F)	39 mm (1.5 inches)	69%	extreme
May Weather	13°C (55°F)	36 mm (1.4 inches)	54%	extreme
June Weather	20°C (69°F)	8 mm (0.3 inches)	45%	extreme
July Weather	24°C (76°F)	12 mm (0.5 inches)	37%	extreme
August Weather	23°C (74°F)	9 mm (0.4 inches)	34%	extreme
September Weather	18°C (64°F)	18 mm (0.7 inches)	47%	very high
October Weather	8°C (47°F)	34 mm (1.3 inches)	67%	high
November Weather	3°C (38°F)	28 mm (1.1 inches)	82%	high
December Weather	-3°C (27°F)	43 mm (1.7 inches)	87%	moderate