Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
The advent of September brings a subtle shift in temperature, with the average high moving from a tropical 87.8°F (31°C) in August to a moderately hot 79.7°F (26.5°C). Despite a stark disparity with daily highs, Keenesburg records an average nighttime temperature of 53.8°F (12.1°C) in September.Humidity
In Keenesburg, the average relative humidity in September is 42%.Rainfall
In September, the rain falls for 8.1 days. Throughout September, 0.75" (19mm) of precipitation is accumulated. Throughout the year, there are 96 rainfall days, and 11.1" (282mm) of precipitation is accumulated.Snowfall
In Keenesburg, snow does not fall in June through September.Daylight
In September, the average length of the day in Keenesburg 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, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The maximum daily UV index of 5 in September converts into the following recommendations:
Be vigilant - Suggestions to stave off sun damage are provided. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Employ a wide-brim hat for potent defense against up to 50% of UV rays. Notice this! Nearly double the intensity of the Sun's UV radiation can be caused by snow reflection.
Frequently asked questions
What are the temperatures in Keenesburg in September?
What is the average humidity in September in Keenesburg?
How many days does it rain in September in Keenesburg?
When it does not snow in Keenesburg?
Does it snow in Keenesburg in September?
How many hours of daylight does Keenesburg have in September?
What time are sunrise and sunset in September in Keenesburg?
How long on average sun shines in September in Keenesburg?
What is the UV index intensity in September in Keenesburg?
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 2min
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 5min
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).
Keenesburg, Colorado, USA
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