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 transition into September is accompanied by a slight temperature decrease, with the average high-temperature shifting from a hot 86.4°F (30.2°C) in August to a moderately hot 78.8°F (26°C). Prospect Valley's September nights see a large temperature deviation, with temperatures resting at a low of 54°F (12.2°C).Humidity
August and September, with an average relative humidity of 42%, are the least humid months.Rainfall
In September, in Prospect Valley, the rain falls for 8.6 days. Throughout September, 0.63" (16mm) of precipitation is accumulated. Throughout the year, there are 81.5 rainfall days, and 8.7" (221mm) of precipitation is accumulated.Snowfall
In Prospect Valley, snow does not fall in June through September.Daylight
The average length of the day in September is 12h and 26min.On the first day of September, sunrise is at 6:26 am and sunset at 7:28 pm. On the last day of the month, sunrise is at 6:53 am and sunset at 6:40 pm MDT.
Sunshine
In September, the average sunshine is 10.9h.UV index
In Prospect Valley, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for the ordinary person.Note: In September, the maximum UV index of 5 suggests this advice:
Take care. Persons with lighter skin might suffer burns in less than 30 minutes. Direct Sun exposure should be minimized especially during midday when radiation is most intense. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes. Consider carefully! The reflective quality of snow can almost double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in September?
What is the least humid month?
What is the average humidity in September?
How many days does it rain in September?
When it does not snow?
Does it snow in September?
How many hours of daylight does Prospect Valley have in September?
What time are sunrise and sunset in September?
How many hours of sunshine does Prospect Valley have in September?
How high is the UV index in September?
Average temperature in September
Prospect Valley, CO
- Average high temperature in September: 78.8°F
The warmest month (with the highest average high temperature) is July (87.6°F).
The month with the lowest average high temperature is December (40.1°F).
- Average low temperature in September: 54°F
The month with the highest average low temperature is July (62.2°F).
The coldest month (with the lowest average low temperature) is December (21.4°F).
Average pressure in September
Prospect Valley, 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 (29.89"Hg).
Average wind speed in September
Prospect Valley, CO
- Average wind speed in September: 6.5mph
The windiest month (with the highest average wind speed) is April (8.1mph).
The calmest months (with the lowest average wind speed) are September and December (6.5mph).
Average humidity in September
Prospect Valley, CO
- Average humidity in September: 42%
The months with the highest relative humidity are January and February (64%).
The months with the lowest relative humidity are August and September (42%).
Average rainfall in September
Prospect Valley, CO
- Average rainfall in September: 0.63"
The wettest month (with the highest rainfall) is May (1.57").
The driest month (with the least rainfall) is December (0.16").
Average rainfall days in September
Prospect Valley, CO
- Average rainfall days in September: 8.6 days
The month with the highest number of rainy days is July (12.6 days).
The month with the least rainy days is January (1.4 days).
Average snowfall in September
Prospect Valley, CO
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.36").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Prospect Valley, CO
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is February (6.6 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Prospect Valley, 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 months with the most sunshine are June and July (Average sunshine: 11h and 54min).
The month with the least sunshine is February (Average sunshine: 6h and 36min).
Average sunshine days in September
Prospect Valley, CO
- Average sunshine days in September: 17 days
The month with the most sunshine days is December (26.4 days).
The month with the least sunshine days is July (13 days).
Average UV index in September
Prospect Valley, 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
Prospect Valley, CO
- Average cloud cover in September: 16
The month with the most cloud cover is April (Cloud cover 28).
The months with the least cloud cover are June and September (Cloud cover 16).
Average visibility in September
Prospect Valley, 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).
Prospect Valley, Colorado, USA
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