September weather forecastClifton, CO
September
Weather in September
The first month of the autumn, September, is also a moderately hot month in Clifton, Colorado, with an average temperature varying between 74.7°F (23.7°C) and 50.5°F (10.3°C).Temperature
The shift from August to September includes a small decrease in the average high-temperature, from a warm 82°F (27.8°C) to a still moderately hot 74.7°F (23.7°C). September nights are characterized by a significant departure from the daytime highs, dropping to an average temperature of 50.5°F (10.3°C).Humidity
The average relative humidity in September is 42%.Rainfall
In Clifton, during September, the rain falls for 11.9 days and regularly aggregates up to 1.06" (27mm) of precipitation. In Clifton, during the entire year, the rain falls for 127.9 days and collects up to 13.35" (339mm) of precipitation.Snowfall
June through September are months without snowfall.Daylight
In September, the average length of the day is 12h and 26min.On the first day of September, sunrise is at 6:43 am and sunset at 7:43 pm. On the last day of the month, sunrise is at 7:09 am and sunset at 6:57 pm MDT.
Sunshine
In Clifton, the average sunshine in September is 11h.UV index
In Clifton, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: A maximum daily UV index of 4 during September morphs into the following directions:
Heed the precautions - It is counselled to guard against solar damage. 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 the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Clifton, CO
- Average high temperature in September: 74.7°F
The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is January (33.3°F).
- Average low temperature in September: 50.5°F
The month with the highest average low temperature is July (57.7°F).
The coldest month (with the lowest average low temperature) is January (16.5°F).
Average pressure in September
Clifton, CO
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.27"Hg).
The months with the lowest atmospheric pressure are May and June (29.91"Hg).
Average wind speed in September
Clifton, CO
- Average wind speed in September: 5.9mph
The windiest month (with the highest average wind speed) is June (7.2mph).
The calmest month (with the lowest average wind speed) is January (4.1mph).
Average humidity in September
Clifton, CO
- Average humidity in September: 42%
The month with the highest relative humidity is January (80%).
The month with the lowest relative humidity is June (32%).
Average rainfall in September
Clifton, CO
- Average rainfall in September: 1.06"
The wettest month (with the highest rainfall) is March (1.42").
The driest month (with the least rainfall) is November (0.79").
Average rainfall days in September
Clifton, CO
- Average rainfall days in September: 11.9 days
The month with the highest number of rainy days is April (14.8 days).
The month with the least rainy days is November (7 days).
Average snowfall in September
Clifton, CO
- Average snowfall in September: 0"
The month with the highest snowfall is December (5.39").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Clifton, CO
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (9.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Clifton, 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: 11h and 0min
The months with the most sunshine are June and August (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 6h and 12min).
Average sunshine days in September
Clifton, CO
- Average sunshine days in September: 14.6 days
The month with the most sunshine days is November (21 days).
The month with the least sunshine days is August (11.2 days).
Average UV index in September
Clifton, CO
- Average UV index in September: 4
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Clifton, CO
- Average cloud cover in September: 12
The months with the most cloud cover are January and February (Cloud cover 33).
The months with the least cloud cover are June and September (Cloud cover 12).
Average visibility in September
Clifton, CO
- Average visibility in September: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January and February (5mi).
