September weather forecastCooper, CO
September
Weather in September
The first month of the autumn, September, is still a warm month in Cooper, Colorado, with an average temperature ranging between min 56.3°F (13.5°C) and max 79.5°F (26.4°C).Temperature
September is characterized by a mild reduction in the average high-temperature, from a hot 86.7°F (30.4°C) in August to a warm 79.5°F (26.4°C). In September, the temperature sees a substantial plunge from daytime highs to a low average of 56.3°F (13.5°C).Humidity
August and September, with an average relative humidity of 45%, are the least humid months.Rainfall
In Cooper, during September, the rain falls for 8.5 days and regularly aggregates up to 0.71" (18mm) of precipitation. Throughout the year, there are 104 rainfall days, and 12.09" (307mm) of precipitation is accumulated.Snowfall
In Cooper, snow does not fall in June through September.Daylight
In Cooper, Colorado, the average length of the day in September is 12h and 26min.On the first day of the month, sunrise is at 6:22 am and sunset at 7:25 pm. On the last day of September, sunrise is at 6:50 am and sunset at 6:37 pm MDT.
Sunshine
In September, the average sunshine is 10.6h.UV index
In Cooper, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: In September, a daily maximum UV index of 5 leads to the following instructions:
Take precautions - Protection against skin and eye damage is obliged. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. To cut down UV radiation exposure by about half, sport a wide-brim hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Cooper, CO
- Average high temperature in September: 79.5°F
The warmest month (with the highest average high temperature) is July (88.7°F).
The month with the lowest average high temperature is December (38.7°F).
- Average low temperature in September: 56.3°F
The month with the highest average low temperature is July (65.3°F).
The coldest month (with the lowest average low temperature) is December (22.5°F).
Average pressure in September
Cooper, CO
- Average pressure in September: 29.95"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in September
Cooper, CO
- Average wind speed in September: 8.5mph
The windiest month (with the highest average wind speed) is April (10.6mph).
The calmest month (with the lowest average wind speed) is December (7.8mph).
Average humidity in September
Cooper, CO
- Average humidity in September: 45%
The month with the highest relative humidity is January (64%).
The months with the lowest relative humidity are August and September (45%).
Average rainfall in September
Cooper, CO
- Average rainfall in September: 0.71"
The wettest month (with the highest rainfall) is May (2.2").
The driest months (with the least rainfall) are January and December (0.39").
Average rainfall days in September
Cooper, CO
- Average rainfall days in September: 8.5 days
The month with the highest number of rainy days is July (14.4 days).
The month with the least rainy days is November (2.9 days).
Average snowfall in September
Cooper, CO
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.64").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Cooper, CO
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (8.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Cooper, 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 36min
The months with the most sunshine are June, July and August (Average sunshine: 11h and 48min).
The months with the least sunshine are February and December (Average sunshine: 6h and 30min).
Average sunshine days in September
Cooper, CO
- Average sunshine days in September: 18.6 days
The month with the most sunshine days is November (23.4 days).
The month with the least sunshine days is July (12.8 days).
Average UV index in September
Cooper, 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
Cooper, CO
- Average cloud cover in September: 17
The month with the most cloud cover is February (Cloud cover 31).
The month with the least cloud cover is August (Cloud cover 16).
Average visibility in September
Cooper, 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).
