September weather forecastLongview, TX
September
Weather in September
In September, Longview residents begin to feel the gradual downswing in temperatures. Despite the fall, the sweltering heat of August still lingers, resulting in an average high of 88.7°F (31.5°C). The city experiences a decrease in daylight hours and rainfall, giving way to less humid conditions. The changing season paints colorful landscapes, welcoming the beginning of autumn.Temperature
The transition into September subtly indicates a reduction in the average high-temperature, down to a hot 88.7°F (31.5°C) from August's torrid 95°F (35°C). Longview records an average low of 67.5°F (19.7°C) throughout the nights in September.Heat index
Throughout September, the heat index is estimated at a torrid 102.2°F (39°C). Ensure extra safety steps, heat exhaustion and heat cramps are likely. Long activity might lead to heatstroke.Bear in mind that the heat index values are determined for shaded areas and light breezes. The heat index can potentially augment by 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'real feel', provides an understanding of perceived warmth by combining temperature and relative humidity. The influence of weather is personal, differing among individuals based on variations in body mass, stature, and the degree of physical exertion. Consider the fact that direct sun exposure can influence how hot one feels, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. In general, children are more at risk than adults because they sweat less. Furthermore, the large skin surface compared to their small bodies and the high heat production due to their actions contribute to this vulnerability.
For the human body, perspiration is the go-to method to regulate temperature, using sweat's evaporation to dissipate warmth. Under conditions of increased relative humidity, the evaporation rate lessens, causing the body to retain more heat than under less humid conditions. As body temperatures escalate without effective heat release, one might face dehydration threats.
Humidity
In September, the average relative humidity is 69%.Rainfall
The month with the least rainfall is September, when the rain falls for 11.8 days and typically collects 1.69" (43mm) of precipitation.Snowfall
In Longview, snow does not fall in April through December.Daylight
The average length of the day in September is 12h and 22min.On the first day of September, sunrise is at 6:54 am and sunset at 7:43 pm. On the last day of the month, sunrise is at 7:12 am and sunset at 7:04 pm CDT.
Sunshine
The average sunshine in September is 9.1h.UV index
In September, the average daily maximum UV index is 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: The maximum UV index, 6 during September, leads to the following recommendations:
Beware of overexposure. Fair-skinned individuals risk burning in less than 20 minutes. The Sun's UV radiation is at its strongest between the hours of 10 a.m. and 4 p.m. Minimize direct exposure to the sun during this period. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Longview, TX
- Average high temperature in September: 88.7°F
The warmest month (with the highest average high temperature) is August (95°F).
The month with the lowest average high temperature is January (54.3°F).
- Average low temperature in September: 67.5°F
The month with the highest average low temperature is August (73.6°F).
The coldest month (with the lowest average low temperature) is January (38.7°F).
Average pressure in September
Longview, TX
- Average pressure in September: 29.98"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
Longview, TX
- Average wind speed in September: 5.3mph
The windiest month (with the highest average wind speed) is April (7.5mph).
The calmest month (with the lowest average wind speed) is September (5.3mph).
Average humidity in September
Longview, TX
- Average humidity in September: 69%
The month with the highest relative humidity is February (80%).
The month with the lowest relative humidity is August (65%).
Average rainfall in September
Longview, TX
- Average rainfall in September: 1.69"
The wettest month (with the highest rainfall) is April (3.86").
The driest month (with the least rainfall) is September (1.69").
Average rainfall days in September
Longview, TX
- Average rainfall days in September: 11.8 days
The month with the highest number of rainy days is May (14.2 days).
The month with the least rainy days is January (9.3 days).
Average snowfall in September
Longview, TX
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.59").
The months with the least snowfall are April, May, June, July, August, September, October, November and December (0").
Average snowfall days in September
Longview, TX
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (1.3 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
Longview, TX
- Average daylight in September: 12h and 24min
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 6min).
- Average sunshine in September: 9h and 6min
The month with the most sunshine is August (Average sunshine: 10h and 30min).
The month with the least sunshine is December (Average sunshine: 5h and 0min).
Average sunshine days in September
Longview, TX
- Average sunshine days in September: 16.5 days
The month with the most sunshine days is January (19.7 days).
The month with the least sunshine days is February (13.2 days).
Average UV index in September
Longview, TX
- Average UV index in September: 6
The months with the highest UV index are May, June, July and August (UV index 7).
The months with the lowest UV index are January, November and December (UV index 3).
Average cloud cover in September
Longview, TX
- Average cloud cover in September: 30
The month with the most cloud cover is February (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in September
Longview, TX
- Average visibility in September: 6mi
The months with the highest visibility are January, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is February (5mi).
