September weather forecast
Hartsel, CO

Weather in September

The first month of the autumn, September, is still a comfortable month in Hartsel, Colorado, with an average temperature varying between 64.2°F (17.9°C) and 39.7°F (4.3°C).

Temperature

In September, the average high-temperature slightly decreases from a pleasant 70.3°F (21.3°C) in August to a comfortable 64.2°F (17.9°C). In September, in Hartsel, the average low-temperature is 39.7°F (4.3°C).

Humidity

In September, the average relative humidity is 53%.

Rainfall

In Hartsel, it is raining for 11.5 days, with typically 0.94" (24mm) of accumulated precipitation. Throughout the year, there are 112.5 rainfall days, and 14.13" (359mm) of precipitation is accumulated.

Snowfall

January through June, September through December are months with snowfall in Hartsel. September is the first month it typically snows in Hartsel, Colorado. Throughout September, in the average 1 snowfall days, it receives 0.47" (12mm) of snow. Throughout the year, there are 88 snowfall days, and 51.5" (1308mm) of snow is accumulated.

Daylight

In September, the average length of the day in Hartsel is 12h and 26min.
On the first day of the month, sunrise is at 6:32 am and sunset at 7:34 pm. On the last day of September, in Hartsel, Colorado, sunrise is at 6:58 am and sunset at 6:48 pm MDT.

Sunshine

The average sunshine in September is 11.1h.

UV index

The average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for the ordinary person.
Note: The daily maximum UV index of 3 in September interpret into the following advice:
Take precautions - Protection against sunburn is recommended. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the temperature in September in Hartsel?

In Hartsel, in September, the average high-temperature is 64.2°F (17.9°C), and the average low-temperature is 39.7°F (4.3°C).

What is the average humidity in September in Hartsel?

The average relative humidity in September is 53%.

How much does it rain in Hartsel in September?

In Hartsel, Colorado, during September, the rain falls for 11.5 days and regularly aggregates up to 0.94" (24mm) of precipitation.

When does it start snowing in Hartsel?

September is the first month it typically snows in Hartsel, Colorado. Throughout September, in the average 1 snowfall days, it receives 0.47" (12mm) of snow.

How many hours of daylight does Hartsel have in September?

In September, the average day length is 12h and 26min.

What time are sunrise and sunset in September in Hartsel?

In September, on the first day of the month, sunrise is at 6:32 am and sunset at 7:34 pm. On the last day of the month, in Hartsel, sunrise is at 6:58 am and sunset at 6:48 pm MDT.

How long on average sun shines in September in Hartsel?

In Hartsel, the average sunshine duration in September is 11.1h.

How high is the UV index in September in Hartsel?

The average daily maximum UV index in September is 3. A UV Index value of 3 to 5 symbolizes a moderate health threat from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Hartsel, CO

Average temperature in September - Hartsel, CO
  • Average high temperature in September: 64.2°F

The warmest month (with the highest average high temperature) is July (71.6°F).
The month with the lowest average high temperature is December (28.4°F).

  • Average low temperature in September: 39.7°F

The month with the highest average low temperature is July (45.9°F).
The coldest months (with the lowest average low temperature) are January and December (7.2°F).

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Average pressure in September
Hartsel, CO

Average pressure in September - Hartsel, CO
  • Average pressure in September: 30.06"Hg

The month with the highest atmospheric pressure is January (30.18"Hg).
The month with the lowest atmospheric pressure is April (29.93"Hg).

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Average wind speed in September
Hartsel, CO

Average wind speed in September - Hartsel, CO
  • Average wind speed in September: 5.6mph

The windiest month (with the highest average wind speed) is February (7.5mph).
The calmest month (with the lowest average wind speed) is August (4.9mph).

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Average humidity in September
Hartsel, CO

Average humidity in September - Hartsel, CO
  • Average humidity in September: 53%

The month with the highest relative humidity is February (82%).
The month with the lowest relative humidity is June (45%).

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Average rainfall in September
Hartsel, CO

Average rainfall in September - Hartsel, CO
  • Average rainfall in September: 0.94"

The wettest month (with the highest rainfall) is July (2.64").
The driest months (with the least rainfall) are January and November (0.51").

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Average rainfall days in September
Hartsel, CO

Average rainfall days in September - Hartsel, CO
  • Average rainfall days in September: 11.5 days

The month with the highest number of rainy days is July (20.2 days).
The month with the least rainy days is November (3.2 days).

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Average snowfall in September
Hartsel, CO

Average snowfall in September - Hartsel, CO
  • Average snowfall in September: 0.47"

The month with the highest snowfall is April (8.98").
The months with the least snowfall are July and August (0").

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Average snowfall days in September
Hartsel, CO

Average snowfall days in September - Hartsel, CO
  • Average snowfall days in September: 1 days

The month with the highest number of snowfall days is April (13.6 days).
The month with the least snowfall days is August (0 days).

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Average daylight in September /
Average sunshine in September
Hartsel, CO

Average daylight in September / Average sunshine in September - Hartsel, CO
  • Average daylight in September: 12h and 26min

The month with the longest days is June (Average daylight: 14h and 52min).
The month with the shortest days is December (Average daylight: 9h and 29min).

  • Average sunshine in September: 11h and 6min

The month with the most sunshine is June (Average sunshine: 11h and 48min).
The month with the least sunshine is February (Average sunshine: 6h and 42min).

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Average sunshine days in September
Hartsel, CO

Average sunshine days in September - Hartsel, CO
  • Average sunshine days in September: 14.3 days

The month with the most sunshine days is November (21.5 days).
The month with the least sunshine days is July (7 days).

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Average UV index in September
Hartsel, CO

Average UV index in September - Hartsel, CO
  • Average UV index in September: 3

The months with the highest UV index are June, July and August (UV index 4).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 2).

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Average cloud cover in September
Hartsel, CO

Average cloud cover in September - Hartsel, 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 June (Cloud cover 16).

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Average visibility in September
Hartsel, CO

Average visibility in September - Hartsel, 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).

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