September weather forecast
Greeley, IA

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Weather in September

September, the first month of the autumn in Greeley, is still a pleasant month, with an average temperature fluctuating between 53.2°F (11.8°C) and 72.3°F (22.4°C).

Temperature

The arrival of September correlates with a minor temperature reduction, down from August's warm 78.3°F (25.7°C) to an agreeable 72.3°F (22.4°C). Greeley, in September, observes a steady average low-temperature of 53.2°F (11.8°C).

Humidity

In September, the average relative humidity is 79%.

Rainfall

In Greeley, during September, the rain falls for 8.9 days and regularly aggregates up to 1.3" (33mm) of precipitation. In Greeley, during the entire year, the rain falls for 111.7 days and collects up to 13.31" (338mm) of precipitation.

Snowfall

May through September are months without snowfall.

Daylight

In September, the average length of the day is 12h and 28min.
On the first day of the month, sunrise is at 6:31 am and sunset at 7:39 pm. On the last day of September, sunrise is at 7:02 am and sunset at 6:47 pm CDT.

Sunshine

The average sunshine in September is 8.9h.

UV index

In Greeley, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for ordinary individuals.
Note: The UV index of 4 in September translates into these instructions:
Ensure safety - Sun damage prevention is strongly urged. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage.
Updated: Aug 30, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the temperature in September?

In September, in Greeley, the average high-temperature is 72.3°F (22.4°C), and the average low-temperature is 53.2°F (11.8°C).

What is the average humidity in September?

In Greeley, Iowa, the average relative humidity in September is 79%.

How much does it rain in September?

In Greeley, in September, during 8.9 rainfall days, 1.3" (33mm) of precipitation is typically accumulated.

When it does not snow?

May through September are months without snowfall.

Does it snow 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 September, the average day length is 12h and 28min.

When is the sunrise / sunset in September?

On the first day of September, sunrise is at 6:31 am and sunset at 7:39 pm. On the last day of the month, sunrise is at 7:02 am and sunset at 6:47 pm CDT.

How long on average sun shines in September?

In Greeley, the average sunshine duration in September is 8.9h.

How high is the UV index in September?

In Greeley, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium health risk from exposure to the Sun's 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
Greeley, IA

Average temperature in September - Greeley, IA
  • Average high temperature in September: 72.3°F

The warmest month (with the highest average high temperature) is July (79.3°F).
The month with the lowest average high temperature is January (24.3°F).

  • Average low temperature in September: 53.2°F

The month with the highest average low temperature is July (63°F).
The coldest month (with the lowest average low temperature) is January (11.7°F).

Average pressure in September
Greeley, IA

Average pressure in September - Greeley, IA
  • Average pressure in September: 30.02"Hg

The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).

Average wind speed in September
Greeley, IA

Average wind speed in September - Greeley, IA
  • Average wind speed in September: 8.2mph

The windiest month (with the highest average wind speed) is April (10.9mph).
The calmest months (with the lowest average wind speed) are July and August (7.1mph).

Average humidity in September
Greeley, IA

Average humidity in September - Greeley, IA
  • Average humidity in September: 79%

The month with the highest relative humidity is January (88%).
The months with the lowest relative humidity are April and October (75%).

Average rainfall in September
Greeley, IA

Average rainfall in September - Greeley, IA
  • Average rainfall in September: 1.3"

The wettest month (with the highest rainfall) is May (2.13").
The driest month (with the least rainfall) is December (0.47").

Average rainfall days in September
Greeley, IA

Average rainfall days in September - Greeley, IA
  • Average rainfall days in September: 8.9 days

The month with the highest number of rainy days is June (15.4 days).
The month with the least rainy days is February (2.6 days).

Average snowfall in September
Greeley, IA

Average snowfall in September - Greeley, IA
  • Average snowfall in September: 0"

The month with the highest snowfall is January (2.13").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in September
Greeley, IA

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

The month with the highest number of snowfall days is January (10.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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

Average daylight in September / Average sunshine in September - Greeley, IA
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).

  • Average sunshine in September: 8h and 5min

The months with the most sunshine are July and August (Average sunshine: 9h and 36min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).

Average sunshine days in September
Greeley, IA

Average sunshine days in September - Greeley, IA
  • Average sunshine days in September: 18.5 days

The month with the most sunshine days is December (19.7 days).
The month with the least sunshine days is June (11.7 days).

Average UV index in September
Greeley, IA

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

The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January, November and December (UV index 1).

Average cloud cover in September
Greeley, IA

Average cloud cover in September - Greeley, IA
  • Average cloud cover in September: 33

The month with the most cloud cover is January (Cloud cover 63).
The months with the least cloud cover are August and September (Cloud cover 33).

Average visibility in September
Greeley, IA

Average visibility in September - Greeley, IA
  • Average visibility in September: 6mi

The months with the highest visibility are February, March, April, May, June, August, September, October, November and December (6mi).
The months with the lowest visibility are January and July (5mi).

Greeley, Iowa, USA

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