September weather forecast
Hayden, CO

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Weather in September

The first month of the autumn, September, is also an agreeable month in Hayden, Colorado, with an average temperature ranging between max 70°F (21.1°C) and min 43°F (6.1°C).

Temperature

With the beginning of September, the average high-temperature shows a small decrease, transitioning from a moderately hot 78.1°F (25.6°C) in August to a pleasant 70°F (21.1°C). Hayden observes a noteworthy temperature drop from the daily highs during September nights, with a mean temperature of 43°F (6.1°C).

Humidity

In September, the average relative humidity is 47%.

Rainfall

In September, the rain falls for 8.1 days. Throughout September, 0.59" (15mm) of precipitation is accumulated. Throughout the year, in Hayden, there are 96.4 rainfall days, and 13.11" (333mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through June, September through December. September is the first month it typically snows. Throughout September, in the average 0.3 snowfall days, it receives 0.12" (3mm) of snow. Throughout the year, there are 87.1 snowfall days, and 60.47" (1536mm) of snow is accumulated.

Daylight

The average length of the day in September is 12h and 27min.
On the first day of September in Hayden, sunrise is at 6:37 am and sunset at 7:40 pm. On the last day of the month, sunrise is at 7:05 am and sunset at 6:52 pm MDT.

Sunshine

In September, the average sunshine is 11h.

UV index

In Hayden, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for the average person.
Note: A maximum daily UV index of 4 during September morphs into the following directions:
Exercise prevention - Protecting skin and eyes from harm is required. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. 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. Be vigilant! The reflective nature of snow can increase the Sun's UV radiation nearly twofold.
Updated: Feb 10, 2024 | Published by: Weather U.S. | Resources

Frequently asked questions

What are the temperatures in Hayden in September?

The average high-temperature, in September, in Hayden, is 70°F (21.1°C), while the average low-temperature is 43°F (6.1°C).

What is the average humidity in September in Hayden?

In September, the average relative humidity in Hayden, Colorado, is 47%.

How much does it rain in Hayden in September?

In Hayden, Colorado, in September, it is raining for 8.1 days, with typically 0.59" (15mm) of accumulated precipitation.

When does it start snowing in Hayden?

September is the first month it typically snows in Hayden, Colorado. Throughout September, in the average 0.3 snowfall days, it receives 0.12" (3mm) of snow.

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

In Hayden, Colorado, the average day length in September is 12h and 27min.

When is the sunrise / sunset in September in Hayden?

In September, on the first day of the month, sunrise is at 6:37 am and sunset at 7:40 pm. On the last day of the month, sunrise is at 7:05 am and sunset at 6:52 pm MDT.

How many hours of sunshine does Hayden have in September?

In Hayden, Colorado, the average sunshine duration in September is 11h.

How high is the UV index in September in Hayden?

In Hayden, Colorado, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium hazard to health from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Hayden, CO

Average temperature in September - Hayden, CO
  • Average high temperature in September: 70°F

The warmest month (with the highest average high temperature) is July (79.3°F).
The month with the lowest average high temperature is January (27.5°F).

  • Average low temperature in September: 43°F

The month with the highest average low temperature is July (49.6°F).
The coldest month (with the lowest average low temperature) is January (9°F).

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Average pressure in September
Hayden, CO

Average pressure in September - Hayden, CO
  • Average pressure in September: 30.02"Hg

The month with the highest atmospheric pressure is January (30.26"Hg).
The month with the lowest atmospheric pressure is May (29.92"Hg).

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Average wind speed in September
Hayden, CO

Average wind speed in September - Hayden, CO
  • Average wind speed in September: 6.6mph

The windiest months (with the highest average wind speed) are April and June (7.1mph).
The calmest month (with the lowest average wind speed) is January (5.2mph).

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Average humidity in September
Hayden, CO

Average humidity in September - Hayden, CO
  • Average humidity in September: 47%

The months with the highest relative humidity are January and February (86%).
The month with the lowest relative humidity is August (45%).

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Average rainfall in September
Hayden, CO

Average rainfall in September - Hayden, CO
  • Average rainfall in September: 0.59"

The wettest month (with the highest rainfall) is April (1.81").
The driest month (with the least rainfall) is August (0.55").

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Average rainfall days in September
Hayden, CO

Average rainfall days in September - Hayden, CO
  • Average rainfall days in September: 8.1 days

The months with the highest number of rainy days are April and May (12.3 days).
The month with the least rainy days is November (5 days).

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Average snowfall in September
Hayden, CO

Average snowfall in September - Hayden, CO
  • Average snowfall in September: 0.12"

The month with the highest snowfall is January (11.34").
The months with the least snowfall are July and August (0").

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Average snowfall days in September
Hayden, CO

Average snowfall days in September - Hayden, CO
  • Average snowfall days in September: 0.3 days

The month with the highest number of snowfall days is February (16.7 days).
The months with the least snowfall days are July and August (0 days).

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

Average daylight in September / Average sunshine in September - Hayden, 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 18min).

  • Average sunshine in September: 11h and 0min

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: 5h and 24min).

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Average sunshine days in September
Hayden, CO

Average sunshine days in September - Hayden, CO
  • Average sunshine days in September: 17.6 days

The month with the most sunshine days is June (19.6 days).
The month with the least sunshine days is April (10.2 days).

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Average UV index in September
Hayden, CO

Average UV index in September - Hayden, CO
  • Average UV index in September: 4

The months with the highest UV index are June, July and August (UV index 5).
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
Hayden, CO

Average cloud cover in September - Hayden, CO
  • Average cloud cover in September: 13

The month with the most cloud cover is February (Cloud cover 44).
The months with the least cloud cover are June, August and September (Cloud cover 13).

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Average visibility in September
Hayden, CO

Average visibility in September - Hayden, CO
  • Average visibility in September: 6mi

The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January and February (4mi).

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Hayden, Colorado, USA

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