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's onset brings a negligible change in high-temperatures, falling from a hot 92.1°F (33.4°C) in August to a moderately hot 84.7°F (29.3°C). Lewisville's nighttime temperature in September falls to an average of 64°F (17.8°C).Heat index
The heat index value for September is estimated at a tropical 91.4°F (33°C). More safety actions are required, heat exhaustion and heat cramps are probable. Long-term activity may precipitate heatstroke.The standards for the heat index are set for locations in shade and under light breezes. Heat index values may rise by up to 15 Fahrenheit (8 Celsius) degrees when exposed to direct sunlight.
Note: The heat index, also known as 'real feel' or 'feels like', gauges the sensation of temperature factoring in the air's moisture content. The influence of weather is personal, differing among individuals based on variations in body mass, stature, and the degree of physical exertion. Realize that direct exposure to sunlight can augment the felt heat, leading to a potential increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. Young people are generally more susceptible than adults because they perspire less. Furthermore, their proportionally larger skin surface to their petite bodies and the increased heat output from their actions add to the risk.
Humidity
In Lewisville, the average relative humidity in September is 70%.Rainfall
In Lewisville, during September, the rain falls for 9.4 days and regularly aggregates up to 0.83" (21mm) of precipitation. Throughout the year, there are 102.8 rainfall days, and 11.3" (287mm) of precipitation is accumulated.Snowfall
April through October are months without snowfall.Daylight
In September, the average length of the day is 12h and 23min.On the first day of September in Lewisville, sunrise is at 6:54 am and sunset at 7:47 pm. On the last day of the month, sunrise is at 7:15 am and sunset at 7:05 pm CDT.
Sunshine
In September, the average sunshine is 9.3h.UV index
The average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for the average person.Note: The maximum daily UV index of 5 in September interprets into the following recommendations:
Ensure safety - Recommendations to avert sunburn are presented. To guard against the harmful effects of the Sun, minimize exposure during midday. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense.
Frequently asked questions
Is it hot in Lewisville during September?
What is the average humidity in September in Lewisville?
How much does it rain in Lewisville in September?
When it does not snow in Lewisville?
How many hours of daylight does Lewisville have in September?
When are sunrise and sunset in September in Lewisville?
How long on average sun shines in September in Lewisville?
What is the UV index intensity in September in Lewisville?
Average temperature in September
Lewisville, OK
- Average high temperature in September: 84.7°F
The warmest month (with the highest average high temperature) is July (92.5°F).
The month with the lowest average high temperature is January (48.2°F).
- Average low temperature in September: 64°F
The month with the highest average low temperature is July (72°F).
The coldest month (with the lowest average low temperature) is January (32.2°F).
Average pressure in September
Lewisville, OK
- Average pressure in September: 30"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in September
Lewisville, OK
- Average wind speed in September: 6mph
The windiest month (with the highest average wind speed) is April (9mph).
The calmest months (with the lowest average wind speed) are July and August (5.7mph).
Average humidity in September
Lewisville, OK
- Average humidity in September: 70%
The month with the highest relative humidity is May (78%).
The month with the lowest relative humidity is August (68%).
Average rainfall in September
Lewisville, OK
- Average rainfall in September: 0.83"
The wettest month (with the highest rainfall) is May (1.46").
The driest months (with the least rainfall) are January, February and November (0.67").
Average rainfall days in September
Lewisville, OK
- Average rainfall days in September: 9.4 days
The month with the highest number of rainy days is July (11.6 days).
The month with the least rainy days is January (5.9 days).
Average snowfall in September
Lewisville, OK
- Average snowfall in September: 0"
The month with the highest snowfall is December (0.28").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Lewisville, OK
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Lewisville, OK
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).
- Average sunshine in September: 9h and 2min
The months with the most sunshine are July and August (Average sunshine: 11h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 30min).
Average sunshine days in September
Lewisville, OK
- Average sunshine days in September: 17.9 days
The month with the most sunshine days is January (22.9 days).
The month with the least sunshine days is July (16.6 days).
Average UV index in September
Lewisville, OK
- Average UV index in September: 5
The months with the highest UV index are June and July (UV index 7).
The month with the lowest UV index is December (UV index 2).
Average cloud cover in September
Lewisville, OK
- Average cloud cover in September: 26
The month with the most cloud cover is February (Cloud cover 43).
The month with the least cloud cover is August (Cloud cover 22).
Average visibility in September
Lewisville, OK
- 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).
Lewisville, Oklahoma, USA
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