September weather forecast
Commerce City, CO

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Weather in September

September serves as a transition period, moving from the heat of summer to the cooler fall season. Average temperatures start to decline, dropping to a more comfortable 79.5°F (26.4°C). Skies remain mostly clear, setting a beautiful prelude to the fall. Although September is cooler than August, it is warmer than October. Gently, September weather in Commerce City lets go of the heat of summer.

Temperature

As August shifts into September, a minor alteration in temperatures is observed, with average highs reducing from a hot 87.1°F (30.6°C) to a warm 79.5°F (26.4°C). Commerce City's nighttime temperature in September demonstrates a noticeable plunge to a cool 53.8°F (12.1°C).

Humidity

The average relative humidity in September in Commerce City is 41%.

Rainfall

In September, in Commerce City, the rain falls for 3.3 days. Throughout September, 0.16" (4mm) of precipitation is accumulated. In Commerce City, during the entire year, the rain falls for 48.3 days and collects up to 3.19" (81mm) of precipitation.

Snowfall

In Commerce City, snow does not fall in June through September.

Daylight

The average length of the day in September in Commerce City, Colorado, is 12h and 26min.
On the first day of September in Commerce City, 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 6:43 pm MDT.

Sunshine

In Commerce City, the average sunshine in September is 11.1h.

UV index

In September, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for the average person.
Note: A maximum UV index of 5 in September translates into the following recommendations:
Take necessary precautions - Suggestions to elude sunburn are provided. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key.
Updated: Feb 10, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the usual temperature for Commerce City in September?

The average high-temperature, in September, in Commerce City, is 79.5°F (26.4°C), while the average low-temperature is 53.8°F (12.1°C). The average heat index (a.k.a. 'real feel', 'feels like'), which factors the actual air temperature with the relative humidity, in July is estimated at 89.6°F (32°C).

What is the average humidity in September in Commerce City?

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

How much does it rain in Commerce City in September?

In Commerce City, Colorado, during September, the rain falls for 3.3 days and regularly aggregates up to 0.16" (4mm) of precipitation.

When it does not snow in Commerce City?

June through September are months without snowfall in Commerce City, Colorado.

Does it snow in Commerce City in September?

In Commerce City, in September, it doesn't snow. In October, it regularly snows.

How many hours of daylight does Commerce City have in September?

The average day length in September in Commerce City, Colorado, is 12h and 26min.

What time are sunrise and sunset in September in Commerce City?

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, in Commerce City, sunrise is at 6:55 am and sunset at 6:43 pm MDT.

How many hours of sunshine does Commerce City have in September?

In September, the average sunshine duration is 11.1h.

How high is the UV index in September in Commerce City?

In September, the average daily maximum UV index in Commerce City, Colorado, is 5. A UV Index of 3 to 5 symbolizes a medium health risk 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
Commerce City, CO

Average temperature in September - Commerce City, CO
  • Average high temperature in September: 79.5°F

The warmest month (with the highest average high temperature) is July (88.3°F).
The month with the lowest average high temperature is December (41.2°F).

  • Average low temperature in September: 53.8°F

The month with the highest average low temperature is July (61.7°F).
The coldest month (with the lowest average low temperature) is December (21.9°F).

Average pressure in September
Commerce City, CO

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

The month with the highest atmospheric pressure is January (30.14"Hg).
The months with the lowest atmospheric pressure are April and June (29.91"Hg).

Average wind speed in September
Commerce City, CO

Average wind speed in September - Commerce City, CO
  • Average wind speed in September: 5.9mph

The windiest month (with the highest average wind speed) is April (6.9mph).
The calmest month (with the lowest average wind speed) is December (5.8mph).

Average humidity in September
Commerce City, CO

Average humidity in September - Commerce City, CO
  • Average humidity in September: 41%

The month with the highest relative humidity is February (64%).
The month with the lowest relative humidity is August (39%).

Average rainfall in September
Commerce City, CO

Average rainfall in September - Commerce City, CO
  • Average rainfall in September: 0.16"

The wettest month (with the highest rainfall) is July (0.59").
The driest months (with the least rainfall) are January and December (0.08").

Average rainfall days in September
Commerce City, CO

Average rainfall days in September - Commerce City, CO
  • Average rainfall days in September: 3.3 days

The month with the highest number of rainy days is July (8.2 days).
The month with the least rainy days is February (1.2 days).

Average snowfall in September
Commerce City, CO

Average snowfall in September - Commerce City, CO
  • Average snowfall in September: 0"

The month with the highest snowfall is October (1.42").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in September
Commerce City, CO

Average snowfall days in September - Commerce City, CO
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (4.7 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in September /
Average sunshine in September
Commerce City, CO

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

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).

  • Average sunshine in September: 11h and 1min

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 42min).

Average sunshine days in September
Commerce City, CO

Average sunshine days in September - Commerce City, CO
  • Average sunshine days in September: 24.5 days

The month with the most sunshine days is December (28.5 days).
The month with the least sunshine days is July (19.6 days).

Average UV index in September
Commerce City, CO

Average UV index in September - Commerce City, 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).

Average cloud cover in September
Commerce City, CO

Average cloud cover in September - Commerce City, CO
  • Average cloud cover in September: 14

The months with the most cloud cover are February, April and May (Cloud cover 25).
The month with the least cloud cover is September (Cloud cover 14).

Average visibility in September
Commerce City, CO

Average visibility in September - Commerce City, 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).

Commerce City, Colorado, USA

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