September weather forecastGreen Mountain Falls, CO
September
Weather in September
September, the first month of the autumn in Green Mountain Falls, is still a refreshing month, with an average temperature ranging between max 67.6°F (19.8°C) and min 44.4°F (6.9°C).Temperature
With the arrival of September, Green Mountain Falls experiences a modest decline in average high-temperatures, transitioning from an agreeable 73.2°F (22.9°C) in August to an enjoyable 67.6°F (19.8°C). September nights bring a significant cooling from the heat of the day, with averages of 44.4°F (6.9°C).Humidity
In Green Mountain Falls, the average relative humidity in September is 54%.Rainfall
In September, the rain falls for 9.8 days. Throughout September, 1.3" (33mm) of precipitation is accumulated. 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.Daylight
The average length of the day in September in Green Mountain Falls, Colorado, is 12h and 26min.On the first day of the month, sunrise is at 6:29 am and sunset at 7:29 pm. On the last day of September, sunrise is at 6:55 am and sunset at 6:43 pm MDT.
Sunshine
In September, the average sunshine in Green Mountain Falls, Colorado, is 10.5h.UV index
The average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for average individuals.Note: The daily high UV index of 4 during September translates into the following recommendations:
Preventative actions are necessary - Recommendations to ward off sunburn are given. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Be on the lookout! Nearly twofold UV radiation from the Sun can be reflected by snow.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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).
Average pressure in September
Green Mountain Falls, CO
- Average pressure in September: 30.02"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is April (29.91"Hg).
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).
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%).
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").
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).
Average snowfall in September
Green Mountain Falls, CO
- Average snowfall in September: 0"
The month with the highest snowfall is April (12.52").
The months with the least snowfall are July, August and September (0").
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).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Green Mountain Falls, CO
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in September: 10h and 30min
The month with the most sunshine is June (Average sunshine: 11h and 12min).
The month with the least sunshine is February (Average sunshine: 6h and 18min).
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).
Average UV index in September
Green Mountain Falls, CO
- Average UV index in September: 4
The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, February, March, October, November and December (UV index 2).
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).
The months with the least cloud cover are June and November (Cloud cover 21).
Average visibility in September
Green Mountain Falls, CO
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
