September weather forecastSullivan City, TX
September
Weather in September
September, the first month of the autumn in Sullivan City, is also a hot month, with an average temperature fluctuating between 92.8°F (33.8°C) and 77.2°F (25.1°C).Temperature
September's arrival subtly correlates with a reduction in the average high-temperature, down from a very hot 99.9°F (37.7°C) in August to a hot 92.8°F (33.8°C). Throughout September, the temperature in Sullivan City tends to fall to a consistent average low of 77.2°F (25.1°C).Heat index
In September, the heat index is evaluated at a blistering 109.4°F (43°C). Vigilance: Heat cramps and heat exhaustion are likely. The likelihood of heatstroke increases with continued activity.Research indicates the heat index considers values in shaded locales and with light winds. Exposure to the direct sun might augment heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is a fusion of air temperature and moisture levels to demonstrate the sensation of heat. The effect is personal, with varied weather perceptions among individuals due to differences in body mass, stature, and physical activity. Considering the impact of direct sunlight, it's possible for the heat index to surge by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to children. Children often overlook the necessity for resting and fluid replenishment. Thirst is a late sign of dehydration - thus, it is critical to stay hydrated, especially during extended periods of physical activities.
The process of perspiration is vital for the human body to get rid of excess warmth by allowing sweat to evaporate. When air moisture content is high, the cooling process through evaporation is not as efficient, leading to an ineffective body cooling process and a feeling of overheating. As body temperatures escalate without effective heat release, one might face dehydration threats.
Humidity
In September, the average relative humidity is 63%.Rainfall
The month with the most rainfall is September, when the rain falls for 15.3 days and typically aggregates up to 2.2" (56mm) of precipitation.Snowfall
February through December are months without snowfall.Daylight
In September, the average length of the day is 12h and 18min.On the first day of September, sunrise is at 7:14 am and sunset at 7:53 pm. On the last day of the month, sunrise is at 7:26 am and sunset at 7:21 pm CDT.
Sunshine
In Sullivan City, the average sunshine in September is 8.6h.UV index
The average daily maximum UV index in September is 7. A UV Index estimate of 6 to 7 represents a high threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: In September, the maximum UV index of 7 transforms into these recommendations:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. UV radiation from the Sun is most intense between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Sullivan City, TX
- Average high temperature in September: 92.8°F
The warmest month (with the highest average high temperature) is August (99.9°F).
The month with the lowest average high temperature is January (69.8°F).
- Average low temperature in September: 77.2°F
The month with the highest average low temperature is August (80.1°F).
The coldest month (with the lowest average low temperature) is January (53.2°F).
Average pressure in September
Sullivan City, TX
- Average pressure in September: 29.92"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The months with the lowest atmospheric pressure are May and June (29.87"Hg).
Average wind speed in September
Sullivan City, TX
- Average wind speed in September: 9.8mph
The windiest month (with the highest average wind speed) is July (13.7mph).
The calmest months (with the lowest average wind speed) are January and December (9.4mph).
Average humidity in September
Sullivan City, TX
- Average humidity in September: 63%
The month with the highest relative humidity is December (66%).
The month with the lowest relative humidity is August (55%).
Average rainfall in September
Sullivan City, TX
- Average rainfall in September: 2.2"
The wettest month (with the highest rainfall) is September (2.2").
The driest month (with the least rainfall) is February (0.47").
Average rainfall days in September
Sullivan City, TX
- Average rainfall days in September: 15.3 days
The month with the highest number of rainy days is September (15.3 days).
The month with the least rainy days is February (5.6 days).
Average snowfall in September
Sullivan City, TX
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.04").
The months with the least snowfall are February, March, April, May, June, July, August, September, October, November and December (0").
Average snowfall days in September
Sullivan City, TX
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (0.1 days).
The months with the least snowfall days are February, March, April, May, June, July, August, September, October, November and December (0 days).
Average daylight in September /
Average sunshine in September
Sullivan City, TX
- Average daylight in September: 12h and 18min
The month with the longest days is June (Average daylight: 13h and 48min).
The month with the shortest days is December (Average daylight: 10h and 30min).
- Average sunshine in September: 8h and 36min
The month with the most sunshine is July (Average sunshine: 11h and 24min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).
Average sunshine days in September
Sullivan City, TX
- Average sunshine days in September: 12.9 days
The month with the most sunshine days is August (23.3 days).
The month with the least sunshine days is September (12.9 days).
Average UV index in September
Sullivan City, TX
- Average UV index in September: 7
The months with the highest UV index are July and August (UV index 8).
The month with the lowest UV index is December (UV index 4).
Average cloud cover in September
Sullivan City, TX
- Average cloud cover in September: 30
The month with the most cloud cover is December (Cloud cover 36).
The month with the least cloud cover is August (Cloud cover 16).
Average visibility in September
Sullivan City, TX
- 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).
