September weather forecast
Boone, CO

Share

Weather in September

The first month of the autumn, September, is still a warm month in Boone, Colorado, with temperature in the range of an average high of 80.1°F (26.7°C) and an average low of 58.5°F (14.7°C).

Temperature

The commencement of September includes a gentle temperature shift, with the average high-temperature dropping a bit from a hot 87.4°F (30.8°C) in August to a warm 80.1°F (26.7°C). In Boone, the average temperature during the nights of September marks a significant drop from the daily high, settling at a mild 58.5°F (14.7°C).

Humidity

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

Rainfall

In Boone, Colorado, during September, the rain falls for 7.6 days and regularly aggregates up to 0.55" (14mm) of precipitation. Throughout the year, in Boone, there are 83.6 rainfall days, and 9.29" (236mm) of precipitation is accumulated.

Snowfall

June through September are months without snowfall in Boone.

Daylight

The average length of the day in September is 12h and 25min.
On the first day of September in Boone, sunrise is at 6:27 am and sunset at 7:26 pm. On the last day of the month, sunrise is at 6:52 am and sunset at 6:40 pm MDT.

Sunshine

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

UV index

In Boone, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for average individuals.
Note: In September, the maximum UV index of 5 transforms into these recommendations:
Undertake protective steps - Preventing sun damage is advised. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. Experience reduced UV exposure by about half when donning a wide-brim hat.
[Resources]

Frequently asked questions

What is the temperature in September in Boone?

An average high-temperature, in September, in Boone, is 80.1°F (26.7°C) and the average low-temperature is 58.5°F (14.7°C). In August, the average heat index (a.k.a. 'feels like', 'real feel'), which factors the actual air temperature with the relative humidity, is evaluated at 87.8°F (31°C).

What is the average humidity in September in Boone?

In September, the average relative humidity is 41%.

How many days does it rain in September in Boone?

In September, in Boone, the rain falls for 7.6 days. Throughout September, 0.55" (14mm) of precipitation is accumulated.

When it does not snow in Boone?

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

Does it snow in Boone in September?

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

How many hours of daylight does Boone have in September?

The average day length in September in Boone, Colorado, is 12h and 25min.

When is the sunrise / sunset in September in Boone?

On the first day of September in Boone, Colorado, sunrise is at 6:27 am and sunset at 7:26 pm. On the last day of the month, sunrise is at 6:52 am and sunset at 6:40 pm MDT.

How long on average sun shines in September in Boone?

The average sunshine duration in September in Boone, Colorado, is 10.9h.

What is the UV index intensity in September in Boone?

The average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a medium health risk from unprotected exposure to UV radiation.
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
Boone, CO

Average temperature in September - Boone, CO
  • Average high temperature in September: 80.1°F

The warmest month (with the highest average high temperature) is July (89.2°F).
The month with the lowest average high temperature is December (43°F).

  • Average low temperature in September: 58.5°F

The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is December (24.4°F).

[Resources]

Average pressure in September
Boone, CO

Average pressure in September - Boone, CO
  • Average pressure in September: 30"Hg

The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is April (29.88"Hg).

[Resources]

Average wind speed in September
Boone, CO

Average wind speed in September - Boone, CO
  • Average wind speed in September: 7.5mph

The windiest month (with the highest average wind speed) is April (9.3mph).
The calmest month (with the lowest average wind speed) is December (7.1mph).

[Resources]

Average humidity in September
Boone, CO

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

The month with the highest relative humidity is February (59%).
The month with the lowest relative humidity is June (36%).

[Resources]

Average rainfall in September
Boone, CO

Average rainfall in September - Boone, CO
  • Average rainfall in September: 0.55"

The wettest month (with the highest rainfall) is July (1.81").
The driest month (with the least rainfall) is December (0.28").

[Resources]

Average rainfall days in September
Boone, CO

Average rainfall days in September - Boone, CO
  • Average rainfall days in September: 7.6 days

The month with the highest number of rainy days is July (14 days).
The month with the least rainy days is November (2.3 days).

[Resources]

Average snowfall in September
Boone, CO

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

The month with the highest snowfall is February (3.23").
The months with the least snowfall are June, July, August and September (0").

[Resources]

Average snowfall days in September
Boone, CO

Average snowfall days in September - Boone, CO
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (6.3 days).
The months with the least snowfall days are June, July, August and September (0 days).

[Resources]

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

Average daylight in September / Average sunshine in September - Boone, CO
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 36min).

  • Average sunshine in September: 10h and 5min

The month with the most sunshine is June (Average sunshine: 12h and 0min).
The month with the least sunshine is February (Average sunshine: 6h and 42min).

[Resources]

Average sunshine days in September
Boone, CO

Average sunshine days in September - Boone, CO
  • Average sunshine days in September: 19.5 days

The month with the most sunshine days is December (25.1 days).
The month with the least sunshine days is July (12.3 days).

[Resources]

Average UV index in September
Boone, CO

Average UV index in September - Boone, CO
  • Average UV index in September: 5

The month with the highest UV index is June (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).

[Resources]

Average cloud cover in September
Boone, CO

Average cloud cover in September - Boone, CO
  • Average cloud cover in September: 15

The month with the most cloud cover is February (Cloud cover 24).
The month with the least cloud cover is June (Cloud cover 14).

[Resources]

Average visibility in September
Boone, CO

Average visibility in September - Boone, 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).

[Resources]

Boone, Colorado, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location