Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
September is marked by a subtle drop in average high-temperatures, transitioning from an agreeable 68.5°F (20.3°C) in August to a refreshing 61.9°F (16.6°C). Nighttime in September brings a stark departure from the daily high, resting at an average low-temperature of 35.1°F (1.7°C).Humidity
The average relative humidity in September is 56%.Rainfall
In Vail, in September, it is raining for 8.4 days, with typically 0.83" (21mm) of accumulated precipitation. Throughout the year, there are 82.8 rainfall days, and 14.8" (376mm) of precipitation is accumulated.Snowfall
January through December are months with snowfall. In Vail, in September, snow falls for 2.5 days, with typically accumulated 0.71" (18mm) of snow. Throughout the year, there are 107.8 snowfall days, and 77.72" (1974mm) of snow is accumulated.Daylight
In September, the average length of the day is 12h and 26min.On the first day of the month, sunrise is at 6:34 am and sunset at 7:36 pm. On the last day of September, sunrise is at 7:01 am and sunset at 6:48 pm MDT.
Sunshine
In Vail, the average sunshine in September is 11.1h.UV index
The average daily maximum UV index in September in Vail is 3. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for ordinary individuals.Note: In September, a daily maximum UV index of 3 leads to the following instructions:
Put precautions into practice - Guidance to elude sunburn is provided. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Observe! Snow reflection can nearly intensify the Sun's UV radiation twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures in Vail?
What is the average humidity in September?
How many days does it rain in September?
How much does it snow in September?
What is the average length of the day in September?
What time are sunrise and sunset in September?
How long on average sun shines in September?
How high is the UV index in September?
Average temperature in September
Vail, CO
- Average high temperature in September: 61.9°F
The warmest month (with the highest average high temperature) is July (70.3°F).
The months with the lowest average high temperature are January and December (24.1°F).
- Average low temperature in September: 35.1°F
The month with the highest average low temperature is July (41.4°F).
The coldest month (with the lowest average low temperature) is January (1.2°F).
Average pressure in September
Vail, CO
- Average pressure in September: 30.05"Hg
The month with the highest atmospheric pressure is January (30.21"Hg).
The months with the lowest atmospheric pressure are April and May (29.94"Hg).
Average wind speed in September
Vail, CO
- Average wind speed in September: 5mph
The windiest month (with the highest average wind speed) is June (6.3mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity in September
Vail, CO
- Average humidity in September: 56%
The month with the highest relative humidity is February (89%).
The month with the lowest relative humidity is June (51%).
Average rainfall in September
Vail, CO
- Average rainfall in September: 0.83"
The wettest months (with the highest rainfall) are May and July (1.77").
The driest month (with the least rainfall) is November (0.71").
Average rainfall days in September
Vail, CO
- Average rainfall days in September: 8.4 days
The month with the highest number of rainy days is July (17.2 days).
The month with the least rainy days is November (1.6 days).
Average snowfall in September
Vail, CO
- Average snowfall in September: 0.71"
The month with the highest snowfall is February (11.38").
The month with the least snowfall is July (0.12").
Average snowfall days in September
Vail, CO
- Average snowfall days in September: 2.5 days
The month with the highest number of snowfall days is February (16 days).
The month with the least snowfall days is July (0.3 days).
Average daylight in September /
Average sunshine in September
Vail, CO
- Average daylight in September: 12h and 2min
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 1min
The month with the most sunshine is June (Average sunshine: 11h and 54min).
The month with the least sunshine is February (Average sunshine: 5h and 30min).
Average sunshine days in September
Vail, CO
- Average sunshine days in September: 17 days
The month with the most sunshine days is November (22.5 days).
The month with the least sunshine days is July (9.3 days).
Average UV index in September
Vail, CO
- Average UV index in September: 3
The months with the highest UV index are June, July and August (UV index 4).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in September
Vail, CO
- Average cloud cover in September: 16
The month with the most cloud cover is February (Cloud cover 49).
The month with the least cloud cover is June (Cloud cover 15).
Average visibility in September
Vail, CO
- Average visibility in September: 6mi
The months with the highest visibility are May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February, March, April and December (4mi).
Vail, Colorado, USA
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