September weather forecast and climate
Collbran, CO

Weather in September

September, the first month of the autumn, in Collbran, is also an agreeable month, with average temperature varying between 71.2°F (21.8°C) and 46.9°F (8.3°C).

Temperature

In Collbran, the average high-temperature in September marginally drops, from a moderately hot 78.6°F (25.9°C) in August, to an agreeable 71.2°F (21.8°C). The average low-temperature, in Collbran, is 46.9°F (8.3°C).

Humidity

In September, the average relative humidity in Collbran is 47%.

Rainfall

In Collbran, in September, it is raining for 11.4 days, with typically 1.26" (32mm) of accumulated precipitation. Throughout the year, in Collbran, there are 122.7 rainfall days, and 17.91" (455mm) of precipitation is accumulated.

Snowfall

In Collbran snow does not fall in June through September.

Daylight

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

Sunshine

The average sunshine in Collbran is 11h.

UV index

The average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from the exposure to the Sun's UV radiation for the ordinary person.
Note: In September, the average maximum UV index of 4 translate into the following recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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.
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FAQ

What is the temperature in September in Collbran?

The average high-temperature, in September, in Collbran, Colorado, is 71.2°F (21.8°C), while the average low-temperature is 46.9°F (8.3°C).

What is the average humidity in September in Collbran?

In Collbran, Colorado, the average relative humidity in September is 47%.

How many days does it rain in September in Collbran?

In Collbran, Colorado, in September, during 11.4 rainfall days, 1.26" (32mm) of precipitation is typically accumulated.

Does it snow in Collbran in September?

In Collbran, Colorado, in September, it doesn't snow. In October, it regularly snows.

When it does not snow in Collbran?

June through September are months without snowfall in Collbran, Colorado.

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

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

How long on average sun shines in September in Collbran?

In Collbran, Colorado, the average sunshine in September is 11h.

What is the UV index reading in September in Collbran?

In Collbran, Colorado, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate health threat from the exposure to the Sun's UV rays.

Average temperature in September
Collbran, CO

Average temperature in September - Collbran, CO
  • Average high temperature in September: 71.2°F

The warmest month (with the highest average high temperature) is July (81.5°F).
The month with the lowest average high temperature is January (30.6°F).

  • Average low temperature in September: 46.9°F

The month with the highest average low temperature is July (54.3°F).
The coldest month (with the lowest average low temperature) is January (13.5°F).

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Average pressure in September
Collbran, CO

Average pressure in September - Collbran, CO
  • Average pressure in September: 30.02"

The month with the highest atmospheric pressure is January (30.26").
The month with the lowest atmospheric pressure is May (29.91").

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Average wind speed in September
Collbran, CO

Average wind speed in September - Collbran, CO
  • Average wind speed in September: 5.9mph

The windiest month (with the highest average wind speed) is June (7.1mph).
The calmest month (with the lowest average wind speed) is January (4.2mph).

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Average humidity in September
Collbran, CO

Average humidity in September - Collbran, CO
  • Average humidity in September: 47%

The month with the highest relative humidity is January (84%).
The month with the lowest relative humidity is June (37%).

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Average rainfall in September
Collbran, CO

Average rainfall in September - Collbran, CO
  • Average rainfall in September: 1.26"

The wettest month (with the highest rainfall) is March (2.09").
The driest month (with the least rainfall) is August (0.83").

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Average rainfall days in September
Collbran, CO

Average rainfall days in September - Collbran, CO
  • Average rainfall days in September: 11.4 days

The month with the highest number of rainy days is April (15.5 days).
The month with the least rainy days is November (6.2 days).

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Average snowfall in September
Collbran, CO

Average snowfall in September - Collbran, CO
  • Average snowfall in September: 0"

The month with the highest snowfall is January (12.28").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Collbran, CO

Average snowfall days in September - Collbran, CO
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (15.7 days).
Months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in September / Average sunshine in September - Collbran, 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: 11h

The month with the most sunshine is July (Average sunshine: 11.9h).
The month with the least sunshine is January (Average sunshine: 5.8h).

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Average sunshine days in September
Collbran, CO

Average sunshine days in September - Collbran, CO
  • Average sunshine days in September: 16.6 days

The month with the most sunshine days is August (20.8 days).
The month with the least sunshine days is February (10.7 days).

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Average UV index in September
Collbran, CO

Average UV index in September - Collbran, CO
  • Average UV index in September: 4

Months with the highest UV index are June, July and August (UV index 5).
Months with the lowest UV index are January, February, March, October, November and December (UV index 2).

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Average cloud cover in September
Collbran, CO

Average cloud cover in September - Collbran, CO
  • Average cloud cover in September: 14

The month with the most cloud cover is February (Cloud cover 40).
Months with the least cloud cover are June and September (Cloud cover 14).

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Average visibility in September
Collbran, CO

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

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

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