September weather forecast and climate
Crested Butte, CO

Scenic wooden holiday homes amid trees and great scenery in a village in Crested Butte, Colorado, a view of the snowy Mount Butte in the back
Scenic wooden holiday homes amid trees and great scenery in a village in Crested Butte, Colorado, a view of the snowy Mount Butte in the back

Weather in September

The first month of the autumn, September, is still a mild month in Crested Butte, Colorado, with average temperature varying between 58.8°F (14.9°C) and 34.2°F (1.2°C).

Temperature

In September, the average high-temperature marginally drops, from a comfortable 64.6°F (18.1°C) in August, to a moderate 58.8°F (14.9°C). In September, in Crested Butte, the average low-temperature is 34.2°F (1.2°C).

Humidity

In September, the average relative humidity in Crested Butte is 61%.

Rainfall

In Crested Butte, during 13.5 rainfall days, 1.81" (46mm) of precipitation is typically accumulated. In Crested Butte, during the entire year, the rain falls for 117.4 days and collects up to 29.33" (745mm) of precipitation.

Snowfall

January through December are months with snowfall in Crested Butte. In Crested Butte, Colorado, in September, snow falls for 4.5 days, with typically accumulated 1.89" (48mm) of snow. Throughout the year, there are 159 snowfall days, and 149.53" (3798mm) of snow is accumulated.

Daylight

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

Sunshine

The average sunshine in Crested Butte is 10.7h.

UV index

The average daily maximum UV index in September is 2. A UV Index estimate of 2, and below, represents a low threat to health from unsafe exposure to the UV radiation for the ordinary person.
Note: The average daily UV index of 2 in September transform into the following instructions:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. 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 average humidity in September in Crested Butte?

The average relative humidity in September in Crested Butte, Colorado, is 61%.

How much does it rain in Crested Butte in September?

In Crested Butte, Colorado, in September, it is raining for 13.5 days, with typically 1.81" (46mm) of accumulated precipitation.

How many days does it snow in September in Crested Butte?

In Crested Butte, during September, snow falls for 4.5 days and regularly aggregates up to 1.89" (48mm) of snow.

How many hours of daylight does Crested Butte have in September?

In Crested Butte, the average length of the day in September is 12.4h.

How many hours of sunshine does Crested Butte have in September?

The average sunshine in September in Crested Butte, Colorado, is 10.7h.

What is the UV index intensity in September in Crested Butte?

In Crested Butte, the average daily maximum UV index in September is 2. A UV Index reading of 2, and below, represents a low health threat from unsafe exposure to the Sun's UV rays.

Average temperature in September
Crested Butte, CO

Average temperature in September - Crested Butte, CO
  • Average high temperature in September: 58.8°F

The warmest month (with the highest average high temperature) is July (67.6°F).
Months with the lowest average high temperature are February and December (22.6°F).

  • Average low temperature in September: 34.2°F

The month with the highest average low temperature is July (41°F).
The coldest month (with the lowest average low temperature) is January (0°F).

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Average pressure in September
Crested Butte, CO

Average pressure in September - Crested Butte, CO
  • Average pressure in September: 30.06"

The month with the highest atmospheric pressure is January (30.23").
Months with the lowest atmospheric pressure are April and May (29.95").

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Average wind speed in September
Crested Butte, CO

Average wind speed in September - Crested Butte, CO
  • Average wind speed in September: 4.9mph

The windiest month (with the highest average wind speed) is June (6.3mph).
The calmest month (with the lowest average wind speed) is August (4.5mph).

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Average humidity in September
Crested Butte, CO

Average humidity in September - Crested Butte, CO
  • Average humidity in September: 61%

The month with the highest relative humidity is February (91%).
The month with the lowest relative humidity is June (52%).

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Average rainfall in September
Crested Butte, CO

Average rainfall in September - Crested Butte, CO
  • Average rainfall in September: 1.81"

The wettest month (with the highest rainfall) is July (3.74").
The driest month (with the least rainfall) is November (1.61").

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Average rainfall days in September
Crested Butte, CO

Average rainfall days in September - Crested Butte, CO
  • Average rainfall days in September: 13.5 days

The month with the highest number of rainy days is July (22.3 days).
The month with the least rainy days is November (3.1 days).

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Average snowfall in September
Crested Butte, CO

Average snowfall in September - Crested Butte, CO
  • Average snowfall in September: 1.89"

The month with the highest snowfall is March (23.94").
The month with the least snowfall is July (0.16").

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Average snowfall days in September
Crested Butte, CO

Average snowfall days in September - Crested Butte, CO
  • Average snowfall days in September: 4.5 days

The month with the highest number of snowfall days is April (21.8 days).
The month with the least snowfall days is July (0.7 days).

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Average daylight in September /
Average sunshine in September
Crested Butte, CO

Average daylight in September / Average sunshine in September - Crested Butte, 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: 9.5h).

  • Average sunshine in September: 10.7h

The month with the most sunshine is June (Average sunshine: 11.6h).
The month with the least sunshine is February (Average sunshine: 5.1h).

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Average sunshine days in September
Crested Butte, CO

Average sunshine days in September - Crested Butte, CO
  • Average sunshine days in September: 11.8 days

The month with the most sunshine days is November (16.5 days).
The month with the least sunshine days is April (5.3 days).

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Average UV index in September
Crested Butte, CO

Average UV index in September - Crested Butte, CO
  • Average UV index in September: 2

The month with the highest UV index is July (UV index 4).
Months with the lowest UV index are February, March and December (UV index 1).

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Average cloud cover in September
Crested Butte, CO

Average cloud cover in September - Crested Butte, CO
  • Average cloud cover in September: 19

The month with the most cloud cover is February (Cloud cover 55).
The month with the least cloud cover is June (Cloud cover 17).

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Average visibility in September
Crested Butte, CO

Average visibility in September - Crested Butte, 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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