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
September is marked by an average high-temperature of a still moderately hot 73.6°F (23.1°C), almost identical to the preceding month. Nighttime temperatures consistently average a mild 55.4°F (13°C) during September.Humidity
In September, the average relative humidity in Gretna is 79%.Rainfall
September is the month with the least rainfall. Rain falls for 6.4 days and accumulates 0.28" (7mm) of precipitation.Snowfall
In Gretna, snow does not fall in May through September.Daylight
In Gretna, the average length of the day in September is 12h and 27min.On the first day of September in Gretna, sunrise is at 7:03 am and sunset at 8:06 pm. On the last day of the month, sunrise is at 7:31 am and sunset at 7:18 pm EDT.
Sunshine
In Gretna, the average sunshine in September is 8h.UV index
In Gretna, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for the average person.Note: In September, the maximum UV index of 4 suggests this advice:
Take measures. Individuals with light skin might experience burns in under 30 minutes. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. To cut down UV radiation exposure by about half, sport a wide-brim hat.
Frequently asked questions
What is the average September temperature in Gretna?
What is the average humidity in September in Gretna?
What is the driest month 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?
How many hours of daylight does Gretna have in September?
What time are sunrise and sunset in September in Gretna?
How long on average sun shines in September in Gretna?
What is the UV index reading in September in Gretna?
Average temperature in September
Gretna, OH
- Average high temperature in September: 73.6°F
The warmest month (with the highest average high temperature) is July (79.9°F).
The month with the lowest average high temperature is January (31.6°F).
- Average low temperature in September: 55.4°F
The month with the highest average low temperature is July (63.7°F).
The coldest month (with the lowest average low temperature) is January (19.9°F).
Average pressure in September
Gretna, OH
- Average pressure in September: 30.04"Hg
The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Gretna, OH
- Average wind speed in September: 6.6mph
The windiest month (with the highest average wind speed) is January (10.7mph).
The calmest month (with the lowest average wind speed) is August (5.9mph).
Average humidity in September
Gretna, OH
- Average humidity in September: 79%
The month with the highest relative humidity is January (84%).
The month with the lowest relative humidity is October (75%).
Average rainfall in September
Gretna, OH
- Average rainfall in September: 0.28"
The wettest month (with the highest rainfall) is June (0.75").
The driest month (with the least rainfall) is September (0.28").
Average rainfall days in September
Gretna, OH
- Average rainfall days in September: 6.4 days
The month with the highest number of rainy days is May (10 days).
The month with the least rainy days is January (3.3 days).
Average snowfall in September
Gretna, OH
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.47").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Gretna, OH
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (5.9 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, OH
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in September: 8h and 0min
The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 24min).
Average sunshine days in September
Gretna, OH
- Average sunshine days in September: 20.7 days
The month with the most sunshine days is November (23.7 days).
The month with the least sunshine days is May (17.5 days).
Average UV index in September
Gretna, OH
- Average UV index in September: 4
The months with the highest UV index are June and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in September
Gretna, OH
- Average cloud cover in September: 35
The month with the most cloud cover is January (Cloud cover 64).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in September
Gretna, OH
- Average visibility in September: 5mi
The months with the highest visibility are January, February, March, April, May, June, October, November and December (6mi).
The months with the lowest visibility are July, August and September (5mi).
Gretna, Ohio, USA
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