September weather forecast and climate
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 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 82°F (27.8°C) in August, to a still warm 75°F (23.9°C). In Cortez, in September, the average low-temperature is 54.1°F (12.3°C).

Humidity

In September, the average relative humidity is 40%.

Rainfall

In Cortez, in September, it is raining for 6.3 days, with typically 0.47" (12mm) of accumulated precipitation. Throughout the year, in Cortez, there are 78.9 rainfall days, and 9.84" (250mm) of precipitation is accumulated.

Snowfall

May through September are months without snowfall.

Daylight

In Cortez, the average length of the day is 12.4h.

Sunshine

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

UV index

In September, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a medium health hazard from the exposure to the Sun's UV radiation for the average person.
Note: The daily maximum UV index of 5 interpret into the following advice:
Take precautions - Protection against the skin and eye damage is obliged. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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 temperature in September in Cortez?

The average high-temperature, in September, is 75°F (23.9°C), while the average low-temperature is 54.1°F (12.3°C).

What is the average humidity in September in Cortez?

In September, the average relative humidity 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.

Does it snow in Cortez in September?

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

When it does not snow in Cortez?

In Cortez, Colorado, snow does not fall in May through September.

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

The average length of the day in September is 12.4h.

How long on average sun shines in September in Cortez?

The average sunshine in September in Cortez is 10.9h.

What is the UV index reading in September in Cortez?

In Cortez, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate health threat from unprotected exposure to the UV radiation.

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"

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

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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").
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

Months with the highest number of snowfall days are January and December (8.5 days).
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: 12.4h

The month with the longest days is June (Average daylight: 14.7h).
The month with the shortest days is December (Average daylight: 9.6h).

  • Average sunshine in September: 10.9h

The month with the most sunshine is June (Average sunshine: 12.1h).
Months with the least sunshine are January and December (Average sunshine: 6.5).

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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

Months with the highest UV index are June, July and August (UV index 6).
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

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

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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