September weather forecast
Gretna, NE

Weather in September

The first month of the autumn, September, is still a warm month in Gretna, Nebraska, with temperature in the range of an average high of 77°F (25°C) and an average low of 57.6°F (14.2°C).

Temperature

In September, the average high-temperature marginally drops, from a warm 82.9°F (28.3°C) in August, to a still moderately hot 77°F (25°C). In September, the average low-temperature is 57.6°F (14.2°C).

Humidity

In Gretna, the average relative humidity is 72%.

Rainfall

In Gretna, it is raining for 12.5 days, with typically 2.28" (58mm) of accumulated precipitation. In Gretna, Nebraska, during the entire year, the rain falls for 120.7 days and collects up to 22.87" (581mm) of precipitation.

Snowfall

In Gretna snow does not fall in June through September.

Daylight

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

Sunshine

In September, the average sunshine in Gretna is 9h.

UV index

The average daily maximum UV index in Gretna is 5. A UV Index value of 3 to 5 symbolizes a medium vulnerability from the exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 5 interpret into the following advice:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the average humidity in September in Gretna?

The average relative humidity in September in Gretna is 72%.

How many days does it rain in September in Gretna?

In Gretna, during September, the rain falls for 12.5 days and regularly aggregates up to 2.28" (58mm) of precipitation.

When it does not snow in Gretna?

June through September are months without snowfall in Gretna.

Does it snow in Gretna in September?

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

How many hours of daylight does Gretna have in September?

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

How many hours of sunshine does Gretna have in September?

In Gretna, the average sunshine in September is 9h.

What is the UV index intensity in September in Gretna?

In Gretna, Nebraska, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a medium hazard to health from unsafe exposure to the Sun's UV rays.

Average temperature in September
Gretna, NE

Average temperature in September - Gretna, NE
  • Average high temperature in September: 77°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 (30.6°F).

  • Average low temperature in September: 57.6°F

The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (17.1°F).

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Average pressure in September
Gretna, NE

Average pressure in September - Gretna, NE
  • Average pressure in September: 29.99"

The month with the highest atmospheric pressure is January (30.16").
The month with the lowest atmospheric pressure is June (29.86").

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Average wind speed in September
Gretna, NE

Average wind speed in September - Gretna, NE
  • Average wind speed in September: 8.5mph

The windiest month (with the highest average wind speed) is April (10.6mph).
The calmest month (with the lowest average wind speed) is July (7.1mph).

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Average humidity in September
Gretna, NE

Average humidity in September - Gretna, NE
  • Average humidity in September: 72%

The month with the highest relative humidity is January (80%).
The month with the lowest relative humidity is October (65%).

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Average rainfall in September
Gretna, NE

Average rainfall in September - Gretna, NE
  • Average rainfall in September: 2.28"

The wettest month (with the highest rainfall) is June (3.7").
The driest months (with the least rainfall) are January and February (0.63").

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Average rainfall days in September
Gretna, NE

Average rainfall days in September - Gretna, NE
  • Average rainfall days in September: 12.5 days

The month with the highest number of rainy days is May (16.3 days).
The month with the least rainy days is February (2.9 days).

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Average snowfall in September
Gretna, NE

Average snowfall in September - Gretna, NE
  • Average snowfall in September: 0"

The month with the highest snowfall is February (2.2").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Gretna, NE

Average snowfall days in September - Gretna, NE
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (8.5 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
Gretna, NE

Average daylight in September / Average sunshine in September - Gretna, NE
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 15.1h).
The month with the shortest days is December (Average daylight: 9.3h).

  • Average sunshine in September: 9h

The month with the most sunshine is July (Average sunshine: 10.5h).
The month with the least sunshine is January (Average sunshine: 4.9h).

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Average sunshine days in September
Gretna, NE

Average sunshine days in September - Gretna, NE
  • Average sunshine days in September: 15.7 days

The month with the most sunshine days is November (22.2 days).
The month with the least sunshine days is June (11.3 days).

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Average UV index in September
Gretna, NE

Average UV index in September - Gretna, NE
  • 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
Gretna, NE

Average cloud cover in September - Gretna, NE
  • Average cloud cover in September: 28

The month with the most cloud cover is January (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 25).

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Average visibility in September
Gretna, NE

Average visibility in September - Gretna, NE
  • 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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