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 reports an average high-temperature of a still hot 86.7°F (30.4°C), slightly varied from August's 90.5°F (32.5°C). Throughout September, the temperature falls to an average low of 67.8°F (19.9°C).Heat index
In September, the heat index is estimated at a sweltering 98.6°F (37°C). Adopt additional preventive measures, heat cramps and heat exhaustion are potential outcomes. Prolonged activity may trigger heatstroke.Understand that the heat index values take into account shaded locations and mild winds. Direct sunlight can cause a surge in the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', is a fusion of air temperature and moisture levels to demonstrate the sensation of heat. Metabolic differences, pregnancy status, and the level of physical activity are additional factors influencing an individual's weather perception. Keep it in mind, direct sunlight can augment the heat you experience, possibly pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are essentially critical for children. Young ones often do not realize the necessity to rest and replenish their fluids. Thirst is a delayed indication of dehydration - keeping hydrated, particularly in prolonged physical activity, is crucial.
When faced with excessive heat, the human body begins to perspire, utilizing the cooling benefits of sweat evaporation. When the level of relative humidity is elevated, evaporation diminishes, causing more warmth to be retained in the body than in dry air. Heat-related challenges, like dehydration, can be anticipated when body heat isn't managed effectively.
Humidity
The average relative humidity in September in Louisville is 73%.Rainfall
In Louisville, in September, it is raining for 13.4 days, with typically 1.57" (40mm) of accumulated precipitation. In Louisville, during the entire year, the rain falls for 153.5 days and collects up to 24.41" (620mm) of precipitation.Snowfall
April through December are months without snowfall.Daylight
In Louisville, the average length of the day in September is 12h and 21min.On the first day of September in Louisville, sunrise is at 6:18 am and sunset at 7:05 pm. On the last day of the month, sunrise is at 6:35 am and sunset at 6:28 pm CDT.
Sunshine
In Louisville, the average sunshine in September is 8.5h.UV index
In Louisville, the average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV rays for ordinary individuals.Note: In September, the average maximum UV index of 6 translates into the following recommendations:
Beware of overexposure. Fair-skinned individuals risk burning in less than 20 minutes. Between 10 a.m. and 4 p.m., UV radiation is strongest. Make an effort to avoid direct sunlight during this time, remembering that shade structures may not provide full sun protection. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Is it hot during September?
What is the average humidity in September?
How many days does it rain in September?
When it does not snow?
What is the average length of the day in September?
When is the sunrise / sunset in September?
How long on average sun shines in September?
How high is the UV index in September?
Average temperature in September
Louisville, AL
- Average high temperature in September: 86.7°F
The warmest month (with the highest average high temperature) is July (91°F).
The month with the lowest average high temperature is January (56.1°F).
- Average low temperature in September: 67.8°F
The month with the highest average low temperature is July (72.7°F).
The coldest month (with the lowest average low temperature) is January (39.7°F).
Average pressure in September
Louisville, AL
- Average pressure in September: 29.99"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The months with the lowest atmospheric pressure are June and August (29.98"Hg).
Average wind speed in September
Louisville, AL
- Average wind speed in September: 5.5mph
The windiest month (with the highest average wind speed) is January (7.8mph).
The calmest months (with the lowest average wind speed) are July and August (5mph).
Average humidity in September
Louisville, AL
- Average humidity in September: 73%
The month with the highest relative humidity is December (77%).
The month with the lowest relative humidity is October (69%).
Average rainfall in September
Louisville, AL
- Average rainfall in September: 1.57"
The wettest month (with the highest rainfall) is August (3.74").
The driest month (with the least rainfall) is January (1.42").
Average rainfall days in September
Louisville, AL
- Average rainfall days in September: 13.4 days
The month with the highest number of rainy days is July (20.9 days).
The month with the least rainy days is November (7.5 days).
Average snowfall in September
Louisville, AL
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.24").
The months with the least snowfall are April, May, June, July, August, September, October, November and December (0").
Average snowfall days in September
Louisville, AL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (0.4 days).
The months with the least snowfall days are April, May, June, July, August, September, October, November and December (0 days).
Average daylight in September /
Average sunshine in September
Louisville, AL
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 12min).
The month with the shortest days is December (Average daylight: 10h and 6min).
- Average sunshine in September: 8h and 3min
The month with the most sunshine is June (Average sunshine: 10h and 48min).
The month with the least sunshine is December (Average sunshine: 5h and 12min).
Average sunshine days in September
Louisville, AL
- Average sunshine days in September: 13.5 days
The month with the most sunshine days is October (21.5 days).
The month with the least sunshine days is July (7.5 days).
Average UV index in September
Louisville, AL
- Average UV index in September: 6
The months with the highest UV index are June and July (UV index 7).
The months with the lowest UV index are January and December (UV index 3).
Average cloud cover in September
Louisville, AL
- Average cloud cover in September: 32
The month with the most cloud cover is December (Cloud cover 44).
The month with the least cloud cover is October (Cloud cover 29).
Average visibility in September
Louisville, AL
- 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).
Louisville, Alabama, USA
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