September weather forecast and climate
Green Mountain Falls, CO

Weather in September

The first month of the autumn, September, is also an enjoyable month in Green Mountain Falls, Colorado, with temperature in the range of an average low of 44.4°F (6.9°C) and an average high of 67.6°F (19.8°C).

Temperature

In September, the average high-temperature marginally drops, from an agreeable 73.2°F (22.9°C) in August, to a comfortable 67.6°F (19.8°C). In Green Mountain Falls, in September, the average low-temperature is 44.4°F (6.9°C).

Humidity

In September, the average relative humidity in Green Mountain Falls is 54%.

Rainfall

In Green Mountain Falls, during September, the rain falls for 9.8 days and regularly aggregates up to 1.3" (33mm) of precipitation. In Green Mountain Falls, during the entire year, the rain falls for 103.9 days and collects up to 19.69" (500mm) of precipitation.

Snowfall

July through September are months without snowfall in Green Mountain Falls.

Daylight

The average length of the day in Green Mountain Falls is 12.4h.

Sunshine

The average sunshine is 10.5h.

UV index

In Green Mountain Falls, the average daily maximum UV index in September is 4. 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: 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. 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 Green Mountain Falls?

In Green Mountain Falls, in September, the average high-temperature is 67.6°F (19.8°C), and the average low-temperature is 44.4°F (6.9°C).

What is the average humidity in September in Green Mountain Falls?

In Green Mountain Falls, the average relative humidity in September is 54%.

How many days does it rain in September in Green Mountain Falls?

In Green Mountain Falls, Colorado, in September, it is raining for 9.8 days, with typically 1.3" (33mm) of accumulated precipitation.

Does it snow in Green Mountain Falls in September?

In Green Mountain Falls, Colorado, in September, it doesn't snow. In October, it regularly snows.

When it does not snow in Green Mountain Falls?

In Green Mountain Falls snow does not fall in July through September.

How many hours of daylight does Green Mountain Falls have in September?

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

How many hours of sunshine does Green Mountain Falls have in September?

The average sunshine in September in Green Mountain Falls is 10.5h.

What is the UV index intensity in September in Green Mountain Falls?

The average daily maximum UV index in September in Green Mountain Falls, Colorado, is 4. A UV Index reading of 3 to 5 represents a medium hazard to health from unprotected exposure to the UV radiation.

Average temperature in September
Green Mountain Falls, CO

Average temperature in September - Green Mountain Falls, CO
  • Average high temperature in September: 67.6°F

The warmest month (with the highest average high temperature) is July (74.8°F).
The month with the lowest average high temperature is December (33.8°F).

  • Average low temperature in September: 44.4°F

The month with the highest average low temperature is July (50.7°F).
The coldest month (with the lowest average low temperature) is December (14.5°F).

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Average pressure in September
Green Mountain Falls, CO

Average pressure in September - Green Mountain Falls, CO
  • Average pressure in September: 30.02"

The month with the highest atmospheric pressure is January (30.13").
The month with the lowest atmospheric pressure is April (29.91").

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Average wind speed in September
Green Mountain Falls, CO

Average wind speed in September - Green Mountain Falls, CO
  • Average wind speed in September: 6.5mph

The windiest month (with the highest average wind speed) is February (8.3mph).
The calmest month (with the lowest average wind speed) is August (5.9mph).

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Average humidity in September
Green Mountain Falls, CO

Average humidity in September - Green Mountain Falls, CO
  • Average humidity in September: 54%

The month with the highest relative humidity is February (73%).
The month with the lowest relative humidity is June (49%).

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Average rainfall in September
Green Mountain Falls, CO

Average rainfall in September - Green Mountain Falls, CO
  • Average rainfall in September: 1.3"

The wettest month (with the highest rainfall) is May (3.11").
The driest month (with the least rainfall) is November (0.59").

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Average rainfall days in September
Green Mountain Falls, CO

Average rainfall days in September - Green Mountain Falls, CO
  • Average rainfall days in September: 9.8 days

The month with the highest number of rainy days is July (17.6 days).
The month with the least rainy days is November (2.4 days).

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Average snowfall in September
Green Mountain Falls, CO

Average snowfall in September - Green Mountain Falls, CO
  • Average snowfall in September: 0"

The month with the highest snowfall is April (12.52").
Months with the least snowfall are July, August and September (0").

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Average snowfall days in September
Green Mountain Falls, CO

Average snowfall days in September - Green Mountain Falls, CO
  • Average snowfall days in September: 0.1 days

The month with the highest number of snowfall days is April (13 days).
Months with the least snowfall days are July and August (0 days).

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Average daylight in September /
Average sunshine in September
Green Mountain Falls, CO

Average daylight in September / Average sunshine in September - Green Mountain Falls, 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: 10.5h

The month with the most sunshine is June (Average sunshine: 11.2h).
The month with the least sunshine is February (Average sunshine: 6.3h).

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Average sunshine days in September
Green Mountain Falls, CO

Average sunshine days in September - Green Mountain Falls, CO
  • Average sunshine days in September: 18.7 days

The month with the most sunshine days is November (22.2 days).
The month with the least sunshine days is April (10.6 days).

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Average UV index in September
Green Mountain Falls, CO

Average UV index in September - Green Mountain Falls, CO
  • Average UV index in September: 4

Months with the highest UV index are June and July (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
Green Mountain Falls, CO

Average cloud cover in September - Green Mountain Falls, CO
  • Average cloud cover in September: 22

The month with the most cloud cover is April (Cloud cover 34).
Months with the least cloud cover are June and November (Cloud cover 21).

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Average visibility in September
Green Mountain Falls, CO

Average visibility in September - Green Mountain Falls, CO
  • Average visibility in September: 6mi

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

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