September weather forecast
Prospect Valley, CO

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Weather in September

September, the first month of the autumn in Prospect Valley, is still a warm month, with an average temperature ranging between min 54°F and max 78.8°F.

Temperature

The shift from August to September coincides with a small decrease in the average high-temperature, down to a warm 78.8°F from a tropical 86.4°F. Prospect Valley measures a considerable dip from daytime highs with an average low-temperature of 54°F during September.

Humidity

August and September, with an average relative humidity of 42%, are the least humid months.

Rainfall

In September, in Prospect Valley, Colorado, the rain falls for 8.6 days. Throughout September, 0.63" of precipitation is accumulated. Throughout the year, there are 81.5 rainfall days, and 8.7" of precipitation is accumulated.

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 the month, sunrise is at 6:25 am and sunset at 7:29 pm. On the last day of September, sunrise is at 6:53 am and sunset at 6:42 pm MDT.

Sunshine

In Prospect Valley, the average sunshine in September is 10.9h.

UV index

In Prospect Valley, Colorado, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for average individuals.
Note: The maximum UV index, 5 during September, leads to the following recommendations:
Undertake precautions - It is suggested to shield oneself from sunburn. To avoid the Sun's strongest rays, limit exposure around the mid-day period. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit. Mind this! Nearly twice the UV radiation from the Sun can be reflected by the snow.
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FAQ

What is the temperature in September in Prospect Valley?

The average high-temperature and low-temperature in Prospect Valley, Colorado, during September are 78.8°F and 54°F respectively. In August, the average heat index (a.k.a. 'real feel', 'feels like'), which factors the actual air temperature with the relative humidity, is computed to be 86°F.

What is the least humid month in Prospect Valley?

August and September, with an average relative humidity of 42%, are the least humid months in Prospect Valley, Colorado.

What is the average humidity in September in Prospect Valley?

In Prospect Valley, Colorado, the average relative humidity in September is 42%.

How much does it rain in Prospect Valley in September?

In September, in Prospect Valley, Colorado, the rain falls for 8.6 days. Throughout September, 0.63" of precipitation is accumulated.

When it does not snow in Prospect Valley?

In Prospect Valley, Colorado, snow does not fall in June through September.

Does it snow in Prospect Valley in September?

In Prospect Valley, in September, it doesn't snow. In October, it regularly snows.

How many hours of daylight does Prospect Valley have in September?

The average day length in September in Prospect Valley is 12h and 26min.

When is the sunrise / sunset in September in Prospect Valley?

On the first day of September, sunrise is at 6:25 am and sunset at 7:29 pm. On the last day of the month, sunrise is at 6:53 am and sunset at 6:42 pm MDT.

How long on average sun shines in September in Prospect Valley?

In September, the average sunshine duration is 10.9h.

How high is the UV index in September in Prospect Valley?

In September, the average daily maximum UV index in Prospect Valley is 5. A UV Index reading of 3 to 5 represents a medium hazard to health from exposure to Sun's UV rays.
Average high temperature
Average low temperature
Average pressure
Average wind speed
Average max. wind speed
Average wind speed gusts
Average humidity
Average rainfall
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Prospect Valley, CO

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).

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Average pressure in September
Prospect Valley, CO

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).

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Average wind speed in September
Prospect Valley, CO

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).

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Average humidity in September
Prospect Valley, CO

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%).

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Average rainfall in September
Prospect Valley, CO

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").

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Average rainfall days in September
Prospect Valley, CO

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).

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Average snowfall in September
Prospect Valley, CO

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").

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Average snowfall days in September
Prospect Valley, CO

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).

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Average daylight in September /
Average sunshine in September
Prospect Valley, CO

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).

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Average sunshine days in September
Prospect Valley, CO

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).

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Average UV index in September
Prospect Valley, CO

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).

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Average cloud cover in September
Prospect Valley, CO

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).

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Average visibility in September
Prospect Valley, CO

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).

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Prospect Valley, Colorado, USA

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