September weather forecast
Greeley, CO

Weather in September

September, the first month of the autumn, in Greeley, is still a warm month, with average temperature fluctuating between 79.7°F (26.5°C) and 53.8°F (12.1°C).

Temperature

In September, the average high-temperature marginally drops, from a tropical 87.8°F (31°C) in August, to a moderately hot 79.7°F (26.5°C). The average low-temperature, in Greeley, is 53.8°F (12.1°C).

Humidity

Months with the lowest humidity are August and September, with an average relative humidity of 44%.

Rainfall

In Greeley, during September, the rain falls for 6.7 days and regularly aggregates up to 0.55" (14mm) of precipitation. In Greeley, Colorado, during the entire year, the rain falls for 71.4 days and collects up to 7.6" (193mm) of precipitation.

Snowfall

June through September are months without snowfall.

Daylight

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

Sunshine

In September, the average sunshine in Greeley is 10.8h.

UV index

The average daily maximum UV index in Greeley is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from the exposure to the Sun's UV rays for ordinary individuals.
Note: In September, the average maximum UV index of 4 translate into the following recommendations:
Take precautions - Protection against the skin and eye damage is obliged. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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.
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FAQ

What are the least humid months in Greeley?

Months with the lowest humidity in Greeley are August and September, with an average relative humidity of 44%.

What is the average humidity in September in Greeley?

In Greeley, the average relative humidity in September is 44%.

How much does it rain in Greeley in September?

In September, in Greeley, the rain falls for 6.7 days. Throughout September, 0.55" (14mm) of precipitation is accumulated.

When it does not snow in Greeley?

June through September are months without snowfall in Greeley, Colorado.

Does it snow in Greeley in September?

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

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

In Greeley, Colorado, the average length of the day in September is 12.4h.

How many hours of sunshine does Greeley have in September?

The average sunshine in September in Greeley is 10.8h.

How high is the UV index in September in Greeley?

The average daily maximum UV index in September in Greeley is 4. A UV Index estimate of 3 to 5 represents a moderate vulnerability from unsafe exposure to the Sun's UV rays.

Average temperature in September
Greeley, CO

Average temperature in September - Greeley, CO
  • Average high temperature in September: 26.5°C

The warmest month (with the highest average high temperature) is July (31.7°C).
The month with the lowest average high temperature is December (3.5°C).

  • Average low temperature in September: 12.1°C

The month with the highest average low temperature is July (16.7°C).
The coldest month (with the lowest average low temperature) is December (-6.6°C).

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Average pressure in September
Greeley, CO

Average pressure in September - Greeley, CO
  • Average pressure in September: 1015.1mbar

The month with the highest atmospheric pressure is January (1020.3mbar).
The month with the lowest atmospheric pressure is June (1011.9mbar).

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Average wind speed in September
Greeley, CO

Average wind speed in September - Greeley, CO
  • Average wind speed in September: 10.1km/h

The windiest month (with the highest average wind speed) is April (13.6km/h).
The calmest month (with the lowest average wind speed) is December (9.7km/h).

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Average humidity in September
Greeley, CO

Average humidity in September - Greeley, CO
  • Average humidity in September: 44%

Months with the highest relative humidity are January and December (64%).
Months with the lowest relative humidity are August and September (44%).

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Average rainfall in September
Greeley, CO

Average rainfall in September - Greeley, CO
  • Average rainfall in September: 14mm

The wettest month (with the highest rainfall) is May (41mm).
The driest month (with the least rainfall) is December (5mm).

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Average rainfall days in September
Greeley, CO

Average rainfall days in September - Greeley, CO
  • Average rainfall days in September: 6.7 days

The month with the highest number of rainy days is July (11.4 days).
The month with the least rainy days is November (1.6 days).

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Average snowfall in September
Greeley, CO

Average snowfall in September - Greeley, CO
  • Average snowfall in September: 0mm

The month with the highest snowfall is February (60mm).
Months with the least snowfall are June, July, August and September (0mm).

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Average snowfall days in September
Greeley, CO

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

The month with the highest number of snowfall days is February (5.7 days).
Months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in September / Average sunshine in September - Greeley, CO
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 15h).
The month with the shortest days is December (Average daylight: 9.3h).

  • Average sunshine in September: 10.8h

The month with the most sunshine is June (Average sunshine: 11.9h).
Months with the least sunshine are February and December (Average sunshine: 6.6).

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Average sunshine days in September
Greeley, CO

Average sunshine days in September - Greeley, CO
  • Average sunshine days in September: 22 days

The month with the most sunshine days is December (25.9 days).
The month with the least sunshine days is July (16.7 days).

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Average UV index in September
Greeley, CO

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

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
Greeley, CO

Average cloud cover in September - Greeley, CO
  • Average cloud cover in September: 17

The month with the most cloud cover is February (Cloud cover 29).
The month with the least cloud cover is June (Cloud cover 16).

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Average visibility in September
Greeley, CO

Average visibility in September - Greeley, CO
  • Average visibility in September: 10km

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).

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