September weather forecast
Henderson, CO

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Weather in September

September, the first month of the autumn in Henderson, is also a moderately hot month, with an average temperature ranging between min 54°F (12.2°C) and max 79.7°F (26.5°C).

Temperature

The average high-temperature slightly decreases in September, shifting from a hot 88.2°F (31.2°C) in August to a warm 79.7°F (26.5°C). Henderson anticipates a stark contrast in temperature during September nights, with an average low of 54°F (12.2°C).

Humidity

In Henderson, Colorado, the average relative humidity in September is 41%.

Rainfall

In September, the rain falls for 7.2 days. Throughout September, 0.43" (11mm) of precipitation is accumulated. In Henderson, during the entire year, the rain falls for 80.6 days and collects up to 5.87" (149mm) of precipitation.

Snowfall

In Henderson, snow does not fall in June through September.

Daylight

In September, the average length of the day in Henderson, Colorado, is 12h and 26min.
On the first day of the month, sunrise is at 6:28 am and sunset at 7:30 pm. On the last day of September, sunrise is at 6:55 am and sunset at 6:42 pm MDT.

Sunshine

In Henderson, the average sunshine in September is 10.9h.

UV index

In September, the average daily maximum UV index in Henderson is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for average individuals.
Note: An average maximum UV index of 5 in September leads to these recommendations:
Undertake precautions - Guarding against sun damage is counselled. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. Employ a hat with a wide brim for robust protection, cutting UV exposure by half. Guard yourself! Snow reflection can almost double the UV radiation from the Sun.
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Frequently asked questions

What is the average September temperature in Henderson?

During September, Henderson experiences an average high-temperature of 79.7°F (26.5°C) and a low-temperature of 54°F (12.2°C). The average heat index (a.k.a. 'felt air temperature', 'real feel'), which takes the relative humidity and factors it into the air temperature reading, in August is estimated at 87.8°F (31°C).

What is the average humidity in September in Henderson?

In Henderson, Colorado, the average relative humidity in September is 41%.

How much does it rain in Henderson in September?

In Henderson, Colorado, in September, it is raining for 7.2 days, with typically 0.43" (11mm) of accumulated precipitation.

When it does not snow in Henderson?

In Henderson, snow does not fall in June through September.

Does it snow in Henderson in September?

In Henderson, Colorado, in September, it doesn't snow. In October, it regularly snows.

What is the average length of the day in September in Henderson?

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

When is the sunrise / sunset in September in Henderson?

In September, on the first day of the month, sunrise is at 6:28 am and sunset at 7:30 pm. On the last day of the month, sunrise is at 6:55 am and sunset at 6:42 pm MDT.

How many hours of sunshine does Henderson have in September?

In September, the average sunshine duration in Henderson is 10.9h.

How high is the UV index in September in Henderson?

The average daily maximum UV index in September in Henderson, Colorado, is 5. A UV Index estimate of 3 to 5 represents a medium hazard to health from exposure to Sun's UV rays.
Average humidity
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
Henderson, CO

Average temperature in September - Henderson, CO
  • Average high temperature in September: 79.7°F

The warmest month (with the highest average high temperature) is July (88.9°F).
The month with the lowest average high temperature is December (40.8°F).

  • Average low temperature in September: 54°F

The month with the highest average low temperature is July (61.9°F).
The coldest month (with the lowest average low temperature) is December (21.2°F).

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Average pressure in September
Henderson, CO

Average pressure in September - Henderson, 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 (29.9"Hg).

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Average wind speed in September
Henderson, CO

Average wind speed in September - Henderson, CO
  • Average wind speed in September: 6.2mph

The windiest month (with the highest average wind speed) is April (7.5mph).
The calmest month (with the lowest average wind speed) is December (6mph).

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Average humidity in September
Henderson, CO

Average humidity in September - Henderson, CO
  • Average humidity in September: 41%

The months with the highest relative humidity are January and February (64%).
The month with the lowest relative humidity is August (40%).

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Average rainfall in September
Henderson, CO

Average rainfall in September - Henderson, CO
  • Average rainfall in September: 0.43"

The wettest month (with the highest rainfall) is May (0.98").
The driest month (with the least rainfall) is December (0.12").

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Average rainfall days in September
Henderson, CO

Average rainfall days in September - Henderson, CO
  • Average rainfall days in September: 7.2 days

The month with the highest number of rainy days is May (10.8 days).
The month with the least rainy days is December (2.6 days).

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Average snowfall in September
Henderson, CO

Average snowfall in September - Henderson, CO
  • Average snowfall in September: 0"

The month with the highest snowfall is February (1.89").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Henderson, CO

Average snowfall days in September - Henderson, CO
  • Average snowfall days in September: 0.1 days

The month with the highest number of snowfall days is February (6.8 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
Henderson, CO

Average daylight in September / Average sunshine in September - Henderson, 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 48min).
The month with the least sunshine is February (Average sunshine: 6h and 36min).

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Average sunshine days in September
Henderson, CO

Average sunshine days in September - Henderson, CO
  • Average sunshine days in September: 18.7 days

The month with the most sunshine days is December (25.8 days).
The month with the least sunshine days is July (14.8 days).

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Average UV index in September
Henderson, CO

Average UV index in September - Henderson, 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
Henderson, CO

Average cloud cover in September - Henderson, 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, August and September (Cloud cover 16).

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Average visibility in September
Henderson, CO

Average visibility in September - Henderson, 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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Henderson, Colorado, USA

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