September weather forecastGunnison, CO
September
Weather in September
September in Gunnison signals the onset of autumn with gradually fading warmth, shorter days, and changing leaf colors. The transition from summer heat to autumn coolness can be sensed in the more moderate temperatures gracing the city. September also marks the end of snow-free days with the reoccurrence of snowfall. The change in season is underscored by the city's picturesque display of fall foliage, providing some of the most photogenic views of the year. As such, September's weather provides a perfect backdrop for admiring Gunnison's autumnal beauty.Temperature
The beginning of September subtly marks a decrease in the average high-temperature, transitioning from an agreeable 73.2°F (22.9°C) in August to a comfortable 66.6°F (19.2°C). Despite drastic daily temperature oscillations, Gunnison cools down to an average low-temperature of 37.9°F (3.3°C) in September.Humidity
In September, the average relative humidity is 53%.Rainfall
The months with the least rainfall are September and November Rain falls for 8.1 days and accumulates 0.55" (14mm) of rain.Snowfall
July and September are months without snowfall in Gunnison.Daylight
In September, the average length of the day is 12h and 25min.On the first day of the month, sunrise is at 6:37 am and sunset at 7:37 pm. On the last day of September, sunrise is at 7:03 am and sunset at 6:51 pm MDT.
Sunshine
In September, the average sunshine is 11.2h.UV index
The average daily maximum UV index in September in Gunnison is 3. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for ordinary individuals.Note: The daily maximum UV index of 3 in September interprets into the following advice:
Be vigilant - Suggestions to stave off sun damage are provided. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes. Be vigilant! The reflective nature of snow can increase the Sun's UV radiation nearly twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Gunnison, CO
- Average high temperature in September: 66.6°F
The warmest month (with the highest average high temperature) is July (75.6°F).
The month with the lowest average high temperature is January (26.4°F).
- Average low temperature in September: 37.9°F
The month with the highest average low temperature is July (44.1°F).
The coldest month (with the lowest average low temperature) is January (1.9°F).
Average pressure in September
Gunnison, CO
- Average pressure in September: 30.06"Hg
The month with the highest atmospheric pressure is January (30.23"Hg).
The months with the lowest atmospheric pressure are April and May (29.94"Hg).
Average wind speed in September
Gunnison, CO
- Average wind speed in September: 4.8mph
The windiest months (with the highest average wind speed) are May and June (6.3mph).
The calmest months (with the lowest average wind speed) are January and December (4.5mph).
Average humidity in September
Gunnison, CO
- Average humidity in September: 53%
The month with the highest relative humidity is February (88%).
The month with the lowest relative humidity is June (44%).
Average rainfall in September
Gunnison, CO
- Average rainfall in September: 0.55"
The wettest month (with the highest rainfall) is July (1.3").
The driest months (with the least rainfall) are September and November (0.55").
Average rainfall days in September
Gunnison, CO
- Average rainfall days in September: 8.1 days
The month with the highest number of rainy days is July (15.3 days).
The month with the least rainy days is November (2.5 days).
Average snowfall in September
Gunnison, CO
- Average snowfall in September: 0"
The month with the highest snowfall is February (6.97").
The months with the least snowfall are July and September (0").
Average snowfall days in September
Gunnison, CO
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is February (12.8 days).
The month with the least snowfall days is July (0 days).
Average daylight in September /
Average sunshine in September
Gunnison, CO
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in September: 11h and 12min
The month with the most sunshine is June (Average sunshine: 11h and 54min).
The month with the least sunshine is February (Average sunshine: 6h and 18min).
Average sunshine days in September
Gunnison, CO
- Average sunshine days in September: 16.9 days
The months with the most sunshine days are October and November (21.2 days).
The month with the least sunshine days is July (9.7 days).
Average UV index in September
Gunnison, CO
- Average UV index in September: 3
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 2).
Average cloud cover in September
Gunnison, CO
- Average cloud cover in September: 12
The month with the most cloud cover is February (Cloud cover 35).
The months with the least cloud cover are June and September (Cloud cover 12).
Average visibility in September
Gunnison, CO
- Average visibility in September: 6mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January and February (4mi).
