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
Longleaf records an average high-temperature of a still hot 87.4°F (30.8°C) in September, closely mirroring the climate of the previous month. Longleaf experiences a consistent average temperature of 68.4°F (20.2°C) throughout the nights in September.Heat index
The heat index in September is estimated at a very hot 102.2°F (39°C). Ensure extra safety steps, heat exhaustion and heat cramps are likely. Long activity might lead to heatstroke.Metrics for the heat index primarily focus on shaded spots and light wind conditions. If exposed to direct sunlight, the heat index could climb by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', arises from combining readings of air temperature and relative moisture content. This effect is subjective, differing among individuals based on their physical activity and perception of heat, which can be influenced by factors like wind, clothing, and metabolic variances. Direct exposure to the sun's rays can enhance the felt temperature, increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children usually face more risks than adults as their ability to sweat is less. Additionally, their larger skin surface in relation to their petite bodies and higher heat output due to their activities increases their vulnerability.
The human body cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. High relative humidity reduces the evaporation rate, resulting in a lower heat removal rate from the body, causing the perception of being overheated. The body faces dehydration threats when its cooling efforts are outpaced by excessive heat gain.
Humidity
The average relative humidity in September is 77%.Rainfall
The month with the least rainfall is September, when the rain falls for 13.9 days and typically collects 2.05" (52mm) of precipitation.Snowfall
In Longleaf, snow does not fall in March through November.Daylight
The average length of the day in September is 12h and 20min.On the first day of September, sunrise is at 6:46 am and sunset at 7:33 pm. On the last day of the month, sunrise is at 7:03 am and sunset at 6:56 pm CDT.
Sunshine
In Longleaf, the average sunshine in September is 9.2h.UV index
The average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high health hazard from unprotected exposure to Sun's UV rays for average individuals.Note: The maximum daily UV index of 6 in September interprets into the following recommendations:
Skirt overexposure. People with light complexions might get scorched in under 20 minutes. Between 10 a.m. and 4 p.m., the Sun's UV radiation is at its peak. Limit your exposure to direct sunlight during these hours. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is September?
What is the average humidity in September?
What is the driest month?
How much does it rain in September?
When it does not snow?
How many hours of daylight does Longleaf have in September?
When is the sunrise / sunset in September?
How many hours of sunshine does Longleaf have in September?
What is the UV index intensity in September?
Average temperature in September
Longleaf, LA
- Average high temperature in September: 87.4°F
The warmest month (with the highest average high temperature) is July (92.1°F).
The month with the lowest average high temperature is January (57°F).
- Average low temperature in September: 68.4°F
The month with the highest average low temperature is August (73.2°F).
The coldest month (with the lowest average low temperature) is January (41°F).
Average pressure in September
Longleaf, LA
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in September
Longleaf, LA
- Average wind speed in September: 5.2mph
The windiest month (with the highest average wind speed) is February (7.6mph).
The calmest month (with the lowest average wind speed) is July (5.1mph).
Average humidity in September
Longleaf, LA
- Average humidity in September: 77%
The month with the highest relative humidity is February (83%).
The month with the lowest relative humidity is October (72%).
Average rainfall in September
Longleaf, LA
- Average rainfall in September: 2.05"
The wettest month (with the highest rainfall) is August (3.74").
The driest month (with the least rainfall) is September (2.05").
Average rainfall days in September
Longleaf, LA
- Average rainfall days in September: 13.9 days
The month with the highest number of rainy days is August (16.8 days).
The month with the least rainy days is October (9.7 days).
Average snowfall in September
Longleaf, LA
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.59").
The months with the least snowfall are March, April, May, June, July, August, September, October and November (0").
Average snowfall days in September
Longleaf, LA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (0.5 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).
Average daylight in September /
Average sunshine in September
Longleaf, LA
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 6min).
The month with the shortest days is December (Average daylight: 10h and 12min).
- Average sunshine in September: 9h and 1min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is December (Average sunshine: 4h and 48min).
Average sunshine days in September
Longleaf, LA
- Average sunshine days in September: 14.2 days
The month with the most sunshine days is October (20 days).
The month with the least sunshine days is August (12.3 days).
Average UV index in September
Longleaf, LA
- 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
Longleaf, LA
- Average cloud cover in September: 34
The month with the most cloud cover is February (Cloud cover 52).
The month with the least cloud cover is October (Cloud cover 30).
Average visibility in September
Longleaf, LA
- Average visibility in September: 5mi
The months with the highest visibility are January, February, March, October, November and December (6mi).
The months with the lowest visibility are April, May, June, July, August and September (5mi).
Longleaf, Louisiana, USA
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