September weather forecast and climate
Vail, CO

Sunrise over Vail, Colorado hitting the slope of a mountain with nearby golden colored trees and a hill in the distance
Sunrise over Vail, Colorado hitting the slope of a mountain with nearby golden colored trees and a hill in the distance

Weather in September

September, the first month of the autumn, in Vail, is also an enjoyable month, with average temperature fluctuating between 61.9°F (16.6°C) and 35.1°F (1.7°C).

Temperature

In September, the average high-temperature marginally drops, from a pleasant 68.5°F (20.3°C) in August, to a comfortable 61.9°F (16.6°C). The average low-temperature, in September, is 35.1°F (1.7°C).

Humidity

In September, the average relative humidity in Vail is 56%.

Rainfall

In September, in Vail, the rain falls for 8.4 days. Throughout September, 0.83" (21mm) of precipitation is accumulated. Throughout the year, in Vail, Colorado, there are 82.8 rainfall days, and 14.8" (376mm) of precipitation is accumulated.

Snowfall

January through December are months with snowfall. In Vail, Colorado, during September, snow falls for 2.5 days and regularly aggregates up to 0.71" (18mm) of snow. In Vail, during the entire year, snow falls for 107.8 days, and aggregates up to 77.72" (1974mm) of snow.

Daylight

The average length of the day in September is 12.4h.

Sunshine

In Vail, Colorado, the average sunshine in September is 11.1h.

UV index

In September, the average daily maximum UV index in Vail is 3. A UV Index reading of 3 to 5 represents a moderate health risk from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: The daily maximum UV index of 3 in September interpret into the following advice:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the temperature in September in Vail?

The average high-temperature, in September, in Vail, Colorado, is 61.9°F (16.6°C), while the average low-temperature is 35.1°F (1.7°C).

What is the average humidity in September in Vail?

The average relative humidity in September in Vail, Colorado, is 56%.

How much does it rain in Vail in September?

In September, the rain falls for 8.4 days. Throughout September, 0.83" (21mm) of precipitation is accumulated.

How many days does it snow in September in Vail?

In September, it is snowing for 2.5 days. Throughout September, 0.71" (18mm) of snow is accumulated.

What is the average length of the day in September in Vail?

In Vail, Colorado, the average length of the day in September is 12.4h.

How long on average sun shines in September in Vail?

In Vail, the average sunshine in September is 11.1h.

What is the UV index intensity in September in Vail?

In Vail, the average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a moderate health threat from unprotected exposure to the UV radiation.

Average temperature in September
Vail, CO

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).
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).

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Average pressure in September
Vail, CO

Average pressure in September - Vail, CO
  • Average pressure in September: 30.05"

The month with the highest atmospheric pressure is January (30.21").
Months with the lowest atmospheric pressure are April and May (29.94").

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Average wind speed in September
Vail, CO

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).

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Average humidity in September
Vail, CO

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%).

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Average rainfall in September
Vail, CO

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").

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Average rainfall days in September
Vail, CO

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).

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Average snowfall in September
Vail, CO

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").

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Average snowfall days in September
Vail, CO

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).

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Average daylight in September /
Average sunshine in September
Vail, CO

Average daylight in September / Average sunshine in September - Vail, CO
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.9h).
The month with the shortest days is December (Average daylight: 9.4h).

  • Average sunshine in September: 11.1h

The month with the most sunshine is June (Average sunshine: 11.9h).
The month with the least sunshine is February (Average sunshine: 5.5h).

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Average sunshine days in September
Vail, CO

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).

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Average UV index in September
Vail, CO

Average UV index in September - Vail, CO
  • Average UV index in September: 3

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).

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Average cloud cover in September
Vail, CO

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).

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Average visibility in September
Vail, CO

Average visibility in September - Vail, CO
  • Average visibility in September: 6mi

Months with the highest visibility are May, June, July, August, September and October (6mi).
Months with the lowest visibility are January, February, March, April and December (4mi).

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