September weather forecast and climate
Carbondale, CO

Weather in September

September, the first month of the autumn, in Carbondale, is also an agreeable month, with average temperature ranging between max 69.3°F (20.7°C) and min 39.7°F (4.3°C).

Temperature

In September, the average high-temperature slightly decreases, from a warm 76.8°F (24.9°C) in August, to an agreeable 69.3°F (20.7°C). In September, the average low-temperature is 39.7°F (4.3°C).

Humidity

The average relative humidity in Carbondale is 52%.

Rainfall

The month with the least rainfall in Carbondale is September when the rain falls for 6.4 days and typically collects 0.35" (9mm) of precipitation.

Snowfall

In Carbondale snow does not fall in July through September.

Daylight

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

Sunshine

In Carbondale, Colorado, the average sunshine is 11.2h.

UV index

In Carbondale, Colorado, the average daily maximum UV index is 3. A UV Index estimate of 3 to 5 represents a moderate threat to health from the exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 3 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. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
[Resources]

FAQ

What is the temperature in September in Carbondale?

The average high-temperature, in September, is 69.3°F (20.7°C), while the average low-temperature is 39.7°F (4.3°C).

What is the average humidity in September in Carbondale?

In September, the average relative humidity is 52%.

How many days does it rain in September in Carbondale?

In Carbondale, in September, it is raining for 6.4 days, with typically 0.35" (9mm) of accumulated precipitation.

What is the driest month in Carbondale?

The month with the least rainfall in Carbondale, Colorado, is September when the rain falls for 6.4 days and typically collects 0.35" (9mm) of precipitation.

Does it snow in Carbondale in September?

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

When it does not snow in Carbondale?

In Carbondale snow does not fall in July through September.

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

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

How long on average sun shines in September in Carbondale?

In Carbondale, the average sunshine in September is 11.2h.

How high is the UV index in September in Carbondale?

In September, the average daily maximum UV index in Carbondale is 3. A UV Index of 3 to 5 symbolizes a medium health risk from unsafe exposure to the Sun's UV rays.

Average temperature in September
Carbondale, CO

Average temperature in September - Carbondale, CO
  • Average high temperature in September: 69.3°F

The warmest month (with the highest average high temperature) is July (78.3°F).
The month with the lowest average high temperature is January (29.7°F).

  • Average low temperature in September: 39.7°F

The month with the highest average low temperature is July (45.5°F).
The coldest month (with the lowest average low temperature) is January (8.1°F).

[Resources]

Average pressure in September
Carbondale, CO

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

The month with the highest atmospheric pressure is January (30.25").
The month with the lowest atmospheric pressure is May (29.94").

[Resources]

Average wind speed in September
Carbondale, CO

Average wind speed in September - Carbondale, CO
  • Average wind speed in September: 4.7mph

The windiest month (with the highest average wind speed) is June (5.7mph).
The calmest months (with the lowest average wind speed) are January and December (4.2mph).

[Resources]

Average humidity in September
Carbondale, CO

Average humidity in September - Carbondale, CO
  • Average humidity in September: 52%

Months with the highest relative humidity are January and February (86%).
The month with the lowest relative humidity is June (47%).

[Resources]

Average rainfall in September
Carbondale, CO

Average rainfall in September - Carbondale, CO
  • Average rainfall in September: 0.35"

The wettest month (with the highest rainfall) is April (1.61").
The driest month (with the least rainfall) is September (0.35").

[Resources]

Average rainfall days in September
Carbondale, CO

Average rainfall days in September - Carbondale, CO
  • Average rainfall days in September: 6.4 days

The month with the highest number of rainy days is April (13.3 days).
The month with the least rainy days is November (5.8 days).

[Resources]

Average snowfall in September
Carbondale, CO

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

The month with the highest snowfall is February (11.02").
Months with the least snowfall are July, August and September (0").

[Resources]

Average snowfall days in September
Carbondale, CO

Average snowfall days in September - Carbondale, CO
  • Average snowfall days in September: 0.2 days

The month with the highest number of snowfall days is February (15.3 days).
Months with the least snowfall days are July and August (0 days).

[Resources]

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

Average daylight in September / Average sunshine in September - Carbondale, 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: 11.2h

Months with the most sunshine are June and August (Average sunshine: 11.9h).
The month with the least sunshine is February (Average sunshine: 6.1h).

[Resources]

Average sunshine days in September
Carbondale, CO

Average sunshine days in September - Carbondale, CO
  • Average sunshine days in September: 20.7 days

The month with the most sunshine days is June (21.9 days).
The month with the least sunshine days is February (10.7 days).

[Resources]

Average UV index in September
Carbondale, CO

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

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

[Resources]

Average cloud cover in September
Carbondale, CO

Average cloud cover in September - Carbondale, CO
  • Average cloud cover in September: 12

The month with the most cloud cover is February (Cloud cover 39).
The month with the least cloud cover is September (Cloud cover 12).

[Resources]

Average visibility in September
Carbondale, CO

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

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

[Resources]