September weather forecastGlenwood Springs, CO
September
Weather in September
September signals the commencement of fall in Glenwood Springs, with temperatures declining compared to August. It wields the least rainfall of the year with just 0.63" (16mm) precipitation observed. The city's vibrant fall colors start to emerge, creating a stunning kaleidoscope of reds, oranges, and yellows. The shift towards the mild temperatures of October is appreciated by many.Temperature
September brings a slight decrease in the average high-temperature, shifting from a moderately hot 76.3°F (24.6°C) in August to an agreeable 69.1°F (20.6°C). In Glenwood Springs, a significant divergence from daytime highs is recorded, with average lows of 41.4°F (5.2°C) during September nights.Humidity
In September, the average relative humidity is 51%.Rainfall
The month with the least rainfall is September, when the rain falls for 8.8 days and typically collects 0.63" (16mm) of precipitation.Snowfall
In Glenwood Springs, snow does not fall in July through September.Daylight
The average length of the day in September is 12h and 26min.On the first day of the month, sunrise is at 6:38 am and sunset at 7:39 pm. On the last day of September, sunrise is at 7:05 am and sunset at 6:52 pm MDT.
Sunshine
The average sunshine in September is 11.1h.UV index
In September, the average daily maximum UV index is 3. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for the average person.Note: The UV index of 3 during September leads to these advisories:
Safety measures are advised. Light-skinned individuals may experience burns in under half an hour. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Glenwood Springs, CO
- Average high temperature in September: 69.1°F
The warmest month (with the highest average high temperature) is July (77.5°F).
The month with the lowest average high temperature is January (29.3°F).
- Average low temperature in September: 41.4°F
The month with the highest average low temperature is July (47.8°F).
The coldest month (with the lowest average low temperature) is January (9.5°F).
Average pressure in September
Glenwood Springs, CO
- Average pressure in September: 30.04"Hg
The month with the highest atmospheric pressure is January (30.25"Hg).
The month with the lowest atmospheric pressure is May (29.93"Hg).
Average wind speed in September
Glenwood Springs, CO
- Average wind speed in September: 4.8mph
The windiest month (with the highest average wind speed) is June (5.8mph).
The calmest months (with the lowest average wind speed) are January and December (4.3mph).
Average humidity in September
Glenwood Springs, CO
- Average humidity in September: 51%
The month with the highest relative humidity is February (86%).
The month with the lowest relative humidity is June (47%).
Average rainfall in September
Glenwood Springs, CO
- Average rainfall in September: 0.63"
The wettest month (with the highest rainfall) is April (1.73").
The driest month (with the least rainfall) is September (0.63").
Average rainfall days in September
Glenwood Springs, CO
- Average rainfall days in September: 8.8 days
The month with the highest number of rainy days is April (15 days).
The month with the least rainy days is February (7.1 days).
Average snowfall in September
Glenwood Springs, CO
- Average snowfall in September: 0"
The month with the highest snowfall is February (11.18").
The months with the least snowfall are July, August and September (0").
Average snowfall days in September
Glenwood Springs, CO
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (15.2 days).
The months with the least snowfall days are July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Glenwood Springs, CO
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in September: 11h and 6min
The months with the most sunshine are June, July and August (Average sunshine: 11h and 48min).
The month with the least sunshine is February (Average sunshine: 6h and 6min).
Average sunshine days in September
Glenwood Springs, CO
- Average sunshine days in September: 15.1 days
The month with the most sunshine days is November (19 days).
The month with the least sunshine days is April (9.6 days).
Average UV index in September
Glenwood Springs, CO
- Average UV index in September: 3
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, March, October, November and December (UV index 2).
Average cloud cover in September
Glenwood Springs, CO
- Average cloud cover in September: 12
The month with the most cloud cover is February (Cloud cover 38).
The month with the least cloud cover is September (Cloud cover 12).
Average visibility in September
Glenwood Springs, 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).
