September weather forecastKeenesburg, CO
September
Weather in September
The first month of the autumn, September, is still a warm month in Keenesburg, Colorado, with an average temperature fluctuating between 53.8°F (12.1°C) and 79.7°F (26.5°C).Temperature
The commencement of September includes a gentle temperature shift, with the average high-temperature dropping a bit from a tropical 87.8°F (31°C) in August to a warm 79.7°F (26.5°C). Keenesburg documents a marked decrease from day to night, with an average low of 53.8°F (12.1°C) throughout September.Humidity
In September, the average relative humidity in Keenesburg is 42%.Rainfall
In Keenesburg, during September, the rain falls for 8.1 days and regularly aggregates up to 0.75" (19mm) of precipitation. In Keenesburg, during the entire year, the rain falls for 96 days and collects up to 11.1" (282mm) of precipitation.Snowfall
In Keenesburg, snow does not fall in June through September.Daylight
In September, the average length of the day is 12h and 26min.On the first day of the month, sunrise is at 6:26 am and sunset at 7:29 pm. On the last day of September, sunrise is at 6:54 am and sunset at 6:41 pm MDT.
Sunshine
In September, the average sunshine is 10.9h.UV index
In Keenesburg, Colorado, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.Note: A maximum UV index of 5 in September translates into the following recommendations:
Take necessary precautions - Protection from skin and eye injury is mandatory. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation. Be aware! The reflective nature of snow can magnify the Sun's UV radiation almost twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Keenesburg, CO
- Average high temperature in September: 79.7°F
The warmest month (with the highest average high temperature) is July (88.9°F).
The month with the lowest average high temperature is December (40.1°F).
- Average low temperature in September: 53.8°F
The month with the highest average low temperature is July (61.9°F).
The coldest month (with the lowest average low temperature) is December (21.2°F).
Average pressure in September
Keenesburg, CO
- Average pressure in September: 29.99"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in September
Keenesburg, CO
- Average wind speed in September: 5.9mph
The windiest month (with the highest average wind speed) is April (7.4mph).
The calmest month (with the lowest average wind speed) is December (5.7mph).
Average humidity in September
Keenesburg, CO
- Average humidity in September: 42%
The months with the highest relative humidity are January and February (64%).
The month with the lowest relative humidity is August (41%).
Average rainfall in September
Keenesburg, CO
- Average rainfall in September: 0.75"
The wettest month (with the highest rainfall) is May (2.2").
The driest month (with the least rainfall) is January (0.28").
Average rainfall days in September
Keenesburg, CO
- Average rainfall days in September: 8.1 days
The month with the highest number of rainy days is May (14.6 days).
The months with the least rainy days are January, February and December (2.4 days).
Average snowfall in September
Keenesburg, CO
- Average snowfall in September: 0"
The month with the highest snowfall is April (3.78").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Keenesburg, CO
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is February (6.7 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Keenesburg, CO
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in September: 10h and 54min
The month with the most sunshine is June (Average sunshine: 11h and 54min).
The month with the least sunshine is February (Average sunshine: 6h and 36min).
Average sunshine days in September
Keenesburg, CO
- Average sunshine days in September: 17.5 days
The month with the most sunshine days is December (25.3 days).
The month with the least sunshine days is July (10.7 days).
Average UV index in September
Keenesburg, CO
- Average UV index in September: 5
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Keenesburg, CO
- Average cloud cover in September: 16
The month with the most cloud cover is April (Cloud cover 27).
The months with the least cloud cover are June and September (Cloud cover 16).
Average visibility in September
Keenesburg, 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).
