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 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
Henderson's transition from August to September introduces an average high-temperature of a still tropical 86.9°F (30.5°C), marking an insignificant variation from the 90.1°F (32.3°C). September is noted for a mean low-temperature of 70°F (21.1°C).Heat index
The heat index in September is computed to be a torrid 102.2°F (39°C). Implement additional preventive actions, heat cramps and heat exhaustion are potential hazards. Heatstroke could follow prolonged activity.Note that heat index values are valued for light wind and location in the shade. The direct sun can potentially cause the heat index to increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', is a calculation that merges air temperature and relative humidity to depict the sensation of warmth. Factors such as metabolic variations, being pregnant, and physical activity can impact an individual's weather perception. Being aware that direct sunlight can impact the felt heat might mean an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Children often lack awareness of the importance of taking breaks and rehydrating. The feeling of thirst is a late indication of dehydration, so maintaining hydration, especially during long periods of physical activity, is critical.
When temperatures rise, the human body turns to perspiration, using the cooling power of evaporating sweat. In situations of high air temperature combined with high humidity (significant heat index), the body's ability to perspire is reduced, heightening the sense of warmth. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.
Humidity
In Henderson, the average relative humidity in September is 80%.Rainfall
In Henderson, in September, it is raining for 13.7 days, with typically 1.02" (26mm) of accumulated precipitation. Throughout the year, there are 135.8 rainfall days, and 16.1" (409mm) of precipitation is accumulated.Snowfall
In Henderson, snow does not fall in February through November.Daylight
In Henderson, the average length of the day in September is 12h and 20min.On the first day of the month, sunrise is at 6:44 am and sunset at 7:29 pm. On the last day of September, sunrise is at 7:00 am and sunset at 6:53 pm CDT.
Sunshine
In September, the average sunshine in Henderson is 9.7h.UV index
In Henderson, the average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV rays for ordinary individuals.Note: In September, the maximum UV index of 6 suggests these recommendations:
Shun overexposure. Protection from sun ravages is indispensable. Attempt to stay under shade and limit exposure to the Sun between 10 a.m. and 4 p.m., when UV radiation is at its peak. Remember, devices such as parasols or canopies might not provide complete sun protection. Employ a hat with a wide brim for robust protection, cutting UV exposure by half.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot does it get in September?
What is the average humidity in September?
How much does it rain in September?
When it does not snow?
How many hours of daylight does Henderson have in September?
What time are sunrise and sunset in September?
How many hours of sunshine does Henderson have in September?
What is the UV index reading in September?
Average temperature in September
Henderson, LA
- Average high temperature in September: 86.9°F
The warmest months (with the highest average high temperature) are July and August (90.1°F).
The month with the lowest average high temperature is January (58.6°F).
- Average low temperature in September: 70°F
The month with the highest average low temperature is August (74.3°F).
The coldest month (with the lowest average low temperature) is January (43.7°F).
Average pressure in September
Henderson, 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 (29.95"Hg).
Average wind speed in September
Henderson, LA
- Average wind speed in September: 5mph
The windiest month (with the highest average wind speed) is February (7.7mph).
The calmest month (with the lowest average wind speed) is July (4.9mph).
Average humidity in September
Henderson, LA
- Average humidity in September: 80%
The month with the highest relative humidity is February (82%).
The month with the lowest relative humidity is October (73%).
Average rainfall in September
Henderson, LA
- Average rainfall in September: 1.02"
The wettest month (with the highest rainfall) is August (2.44").
The driest months (with the least rainfall) are March and November (0.87").
Average rainfall days in September
Henderson, LA
- Average rainfall days in September: 13.7 days
The month with the highest number of rainy days is August (17.7 days).
The month with the least rainy days is November (8.1 days).
Average snowfall days in September
Henderson, LA
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are January and December (0.1 days).
The months with the least snowfall days are February, March, April, May, June, July, August, September, October and November (0 days).
Average daylight in September /
Average sunshine in September
Henderson, 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 4min
The month with the most sunshine is June (Average sunshine: 10h and 36min).
The month with the least sunshine is December (Average sunshine: 5h and 6min).
Average sunshine days in September
Henderson, LA
- Average sunshine days in September: 13.3 days
The month with the most sunshine days is November (21.3 days).
The month with the least sunshine days is August (9.8 days).
Average UV index in September
Henderson, LA
- Average UV index in September: 6
The months with the highest UV index are May, June, July and August (UV index 7).
The month with the lowest UV index is December (UV index 3).
Average cloud cover in September
Henderson, LA
- Average cloud cover in September: 30
The months with the most cloud cover are February and December (Cloud cover 47).
The month with the least cloud cover is October (Cloud cover 26).
Average visibility in September
Henderson, LA
- Average visibility in September: 5mi
The months with the highest visibility are January, February, March, May, June, October, November and December (6mi).
The months with the lowest visibility are April, July, August and September (5mi).
Henderson, Louisiana, USA
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