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 arrival of September suggests a slight decrease in the average high-temperature, moving from a hot 93.7°F (34.3°C) in August to a still tropical 87.1°F (30.6°C). Lewisville's average low-temperature for the month of September records at a refreshing 65.8°F (18.8°C).Heat index
September's heat index is calculated to be a torrid 98.6°F (37°C). More protective measures are required - heat exhaustion and heat cramps are likely. Heatstroke may follow lengthy activity.The metrics for the heat index are tailored for both shady environments and light winds. Under direct sunshine, the heat index values might be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'real feel', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. The influence of weather is personal, differing among individuals based on variations in body mass, stature, and the degree of physical exertion. By being directly under the sun, it's possible for the felt temperature to increase by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly important for children. Young ones often underestimate the need for rest and rehydration. Thirst appears late in dehydration - hence, it is important to keep hydrated, particularly during prolonged physical activities.
Perspiration is essential for the human body; it facilitates cooling through the process of sweat evaporation. An elevated level of relative humidity hinders evaporation, leading to decreased heat elimination from the body, inducing a sensation of excess heat. When the body is unable to balance heat gain, its temperature elevates, which may induce thermal illnesses.
Humidity
In Lewisville, Arkansas, the average relative humidity in September is 71%.Rainfall
In Lewisville, during September, the rain falls for 12 days and regularly aggregates up to 2.64" (67mm) of precipitation. Throughout the year, there are 152.1 rainfall days, and 36.42" (925mm) of precipitation is accumulated.Snowfall
In Lewisville, snow does not fall in April through December.Daylight
In September, the average length of the day is 12h and 22min.On the first day of the month, sunrise is at 6:49 am and sunset at 7:39 pm. On the last day of September, in Lewisville, sunrise is at 7:08 am and sunset at 6:59 pm CDT.
Sunshine
The average sunshine in September is 9.3h.UV index
In September, the average daily maximum UV index in Lewisville is 6. A UV Index of 6 to 7 symbolizes a high threat to health from unsafe exposure to UV radiation for ordinary individuals.Note: In September, the maximum UV index of 6 translates into these guidelines:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. Stay out of direct sunlight and seek shade between 10 a.m. and 4 p.m., when UV radiation is strongest, but remember that shade devices may not offer full sun protection. Opt for tightly woven and loose clothing to enhance protection from the Sun.
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?
How many hours of daylight does Lewisville have in September?
When is the sunrise / sunset in September?
How many hours of sunshine does Lewisville have in September?
How high is the UV index in September?
Average temperature in September
Lewisville, AR
- Average high temperature in September: 87.1°F
The warmest month (with the highest average high temperature) is August (93.7°F).
The month with the lowest average high temperature is January (52°F).
- Average low temperature in September: 65.8°F
The month with the highest average low temperature is July (72.9°F).
The coldest month (with the lowest average low temperature) is January (36.7°F).
Average pressure in September
Lewisville, AR
- 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 (29.93"Hg).
Average wind speed in September
Lewisville, AR
- Average wind speed in September: 5.2mph
The windiest month (with the highest average wind speed) is April (7.3mph).
The calmest month (with the lowest average wind speed) is August (5mph).
Average humidity in September
Lewisville, AR
- Average humidity in September: 71%
The month with the highest relative humidity is February (81%).
The month with the lowest relative humidity is August (69%).
Average rainfall in September
Lewisville, AR
- Average rainfall in September: 2.64"
The wettest month (with the highest rainfall) is April (4.88").
The driest months (with the least rainfall) are January and November (2.36").
Average rainfall days in September
Lewisville, AR
- Average rainfall days in September: 12 days
The month with the highest number of rainy days is May (14.8 days).
The month with the least rainy days is January (9.8 days).
Average snowfall in September
Lewisville, AR
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.43").
The months with the least snowfall are April, May, June, July, August, September, October, November and December (0").
Average snowfall days in September
Lewisville, AR
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (0.9 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Lewisville, AR
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in September: 9h and 2min
The month with the most sunshine is August (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 5h and 0min).
Average sunshine days in September
Lewisville, AR
- Average sunshine days in September: 16.3 days
The months with the most sunshine days are January and October (19.2 days).
The month with the least sunshine days is February (14 days).
Average UV index in September
Lewisville, AR
- Average UV index in September: 6
The months with the highest UV index are June, July and August (UV index 7).
The month with the lowest UV index is December (UV index 2).
Average cloud cover in September
Lewisville, AR
- Average cloud cover in September: 29
The month with the most cloud cover is February (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 28).
Average visibility in September
Lewisville, AR
- Average visibility in September: 6mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February, March and December (5mi).
Lewisville, Arkansas, USA
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