September weather forecast
Cortez, CO

The bright and red rays of the setting sun over the scenic layout of hills and plains of Cortez, Colorado
The bright and red rays of the setting sun over the scenic layout of hills and plains of Cortez, Colorado

Weather in September

The first month of the autumn, September, is still a warm month in Cortez, Colorado, with an average temperature ranging between max 75°F (23.9°C) and min 54.1°F (12.3°C).

Temperature

In September, the average high-temperature marginally drops from a warm 82°F (27.8°C) in August to a still moderately hot 75°F (23.9°C). In September, the average low-temperature is 54.1°F (12.3°C).

Humidity

In September, the average relative humidity in Cortez is 40%.

Rainfall

In Cortez, Colorado, it is raining for 6.3 days, with typically 0.47" (12mm) of accumulated precipitation. In Cortez, during the entire year, the rain falls for 78.9 days and collects up to 9.84" (250mm) of precipitation.

Snowfall

May through September are months without snowfall.

Daylight

In September, the average length of the day is 12h and 25min.
On the first day of September, sunrise is at 6:45 am and sunset at 7:43 pm. On the last day of the month, sunrise is at 7:09 am and sunset at 6:59 pm MDT.

Sunshine

The average sunshine in September in Cortez, Colorado, is 10.9h.

UV index

In Cortez, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for the average person.
Note: The daily maximum UV index of 5 in September interpret into the following advice:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the average humidity in September in Cortez?

The average relative humidity in September in Cortez, Colorado, is 40%.

How much does it rain in Cortez in September?

In Cortez, Colorado, during September, the rain falls for 6.3 days and regularly aggregates up to 0.47" (12mm) of precipitation.

When it does not snow in Cortez?

May through September are months without snowfall in Cortez, Colorado.

Does it snow in Cortez in September?

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

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

In September, the average day length in Cortez, Colorado, is 12h and 25min.

When is the sunrise / sunset in September in Cortez?

On the first day of September, sunrise is at 6:45 am and sunset at 7:43 pm. On the last day of the month, sunrise is at 7:09 am and sunset at 6:59 pm MDT.

How many hours of sunshine does Cortez have in September?

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

How high is the UV index in September in Cortez?

In September, the average daily maximum UV index in Cortez is 5. A UV Index reading of 3 to 5 represents a medium health risk from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Cortez, CO

Average temperature in September - Cortez, CO
  • Average high temperature in September: 75°F

The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is January (35.1°F).

  • Average low temperature in September: 54.1°F

The month with the highest average low temperature is July (61.5°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).

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Average pressure in September
Cortez, CO

Average pressure in September - Cortez, CO
  • Average pressure in September: 29.98"Hg

The month with the highest atmospheric pressure is January (30.23"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).

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Average wind speed in September
Cortez, CO

Average wind speed in September - Cortez, CO
  • Average wind speed in September: 6.9mph

The windiest month (with the highest average wind speed) is April (9.3mph).
The calmest month (with the lowest average wind speed) is January (5.7mph).

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Average humidity in September
Cortez, CO

Average humidity in September - Cortez, CO
  • Average humidity in September: 40%

The month with the highest relative humidity is January (73%).
The month with the lowest relative humidity is June (26%).

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Average rainfall in September
Cortez, CO

Average rainfall in September - Cortez, CO
  • Average rainfall in September: 0.47"

The wettest months (with the highest rainfall) are January and December (1.26").
The driest month (with the least rainfall) is June (0.2").

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Average rainfall days in September
Cortez, CO

Average rainfall days in September - Cortez, CO
  • Average rainfall days in September: 6.3 days

The month with the highest number of rainy days is July (9.6 days).
The month with the least rainy days is June (2.8 days).

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Average snowfall in September
Cortez, CO

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

The month with the highest snowfall is January (8.11").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in September
Cortez, CO

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

The months with the highest number of snowfall days are January and December (8.5 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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

Average daylight in September / Average sunshine in September - Cortez, CO
  • Average daylight in September: 12h and 25min

The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 38min).

  • Average sunshine in September: 10h and 54min

The month with the most sunshine is June (Average sunshine: 12h and 6min).
The months with the least sunshine are January and December (Average sunshine: 6h and 30min).

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Average sunshine days in September
Cortez, CO

Average sunshine days in September - Cortez, CO
  • Average sunshine days in September: 21.9 days

The month with the most sunshine days is June (26.2 days).
The month with the least sunshine days is February (17.6 days).

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Average UV index in September
Cortez, CO

Average UV index in September - Cortez, 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
Cortez, CO

Average cloud cover in September - Cortez, CO
  • Average cloud cover in September: 10

The months with the most cloud cover are January and December (Cloud cover 27).
The month with the least cloud cover is June (Cloud cover 9).

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Average visibility in September
Cortez, CO

Average visibility in September - Cortez, 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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