Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
The transition into September subtly indicates a reduction in the average high-temperature, down to a still moderately hot 77°F (25°C) from August's warm 82.9°F (28.3°C). Gretna experiences an average low-temperature of 57.6°F (14.2°C) in month of September.Humidity
The average relative humidity in September in Gretna is 72%.Rainfall
In September, the rain falls for 12.5 days. Throughout September, 2.28" (58mm) of precipitation is accumulated. In Gretna, during the entire year, the rain falls for 120.7 days and collects up to 22.87" (581mm) of precipitation.Snowfall
June through September are months without snowfall in Gretna.Daylight
The average length of the day in September is 12h and 27min.On the first day of September, sunrise is at 6:52 am and sunset at 7:57 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 7:08 pm CDT.
Sunshine
The average sunshine in September is 9h.UV index
In September, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for the ordinary person.Note: The maximum UV index, 5 during September, leads to the following recommendations:
Take precautions - Protection against skin and eye damage is obliged. When the Sun is at its strongest around midday, find shade and limit exposure. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature in Gretna?
What is the average humidity in September in Gretna?
How much does it rain in Gretna in September?
When it does not snow in Gretna?
Does it snow in Gretna in September?
What is the average length of the day in September in Gretna?
When is the sunrise / sunset in September in Gretna?
How many hours of sunshine does Gretna have in September?
What is the UV index reading in September in Gretna?
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).
Average pressure in September
Gretna, NE
- Average pressure in September: 29.99"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).
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).
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%).
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").
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).
Average snowfall in September
Gretna, NE
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.2").
The months with the least snowfall are June, July, August and September (0").
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).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Gretna, NE
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in September: 9h and 0min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 54min).
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).
Average UV index in September
Gretna, NE
- 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).
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).
Average visibility in September
Gretna, NE
- 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).
Gretna, Nebraska, USA
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