September weather forecastTyler, TX
September
Weather in September
September in Tyler, Texas unravels a subtle transition from hot summer days to cooler autumn evenings. While Sunshine hours decrease, marching towards fall, September retains traces of warmth from the outgoing summer. The lift in precipitation levels brings along more humid days, hence resulting in a somewhat dank atmosphere. The weather phenomenon in September serves as a precursor to the cooler days of October.Temperature
In September, the average high-temperature marginally drops from a very hot 95°F (35°C) in August to a tropical 88.2°F (31.2°C). The nighttime temperature dips to a refreshing 67.6°F (19.8°C) on average during September.Heat index
September's mean heat index is appraised at a torrid 100.4°F (38°C). Heightened safety actions are necessary, heat cramps and heat exhaustion are probable. Persistent activity may lead to heatstroke.It is important to note that the heat index values are for shaded areas and light wind scenarios. Direct sunlight exposure may result in a rise of the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'apparent temperature', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. Additional elements encompassing metabolic differences, the degree of physical activity, and attire can impact the individual's perception of temperature. Direct sunlight exposure should be noted as it has the potential to increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Young ones are generally at greater risk than adults due to their limited sweating ability. In addition, their large skin surface relative to their small bodies and higher heat production from their activities add to their vulnerability.
The human body cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. An elevated level of relative humidity hinders evaporation, leading to decreased heat elimination from the body, inducing a sensation of excess heat. If heat absorption isn't effectively countered by the body's cooling methods, body temperature surges, hinting at potential problems.
Humidity
In Tyler, the average relative humidity in September is 69%.Rainfall
In Tyler, in September, it is raining for 14.1 days, with typically 1.61" (41mm) of accumulated precipitation. Throughout the year, there are 143.4 rainfall days, and 25.75" (654mm) of precipitation is accumulated.Snowfall
April through October and December are months without snowfall.Daylight
In Tyler, the average length of the day in September is 12h and 21min.On the first day of September, sunrise is at 6:56 am and sunset at 7:45 pm. On the last day of the month, sunrise is at 7:15 am and sunset at 7:06 pm CDT.
Sunshine
In September, the average sunshine in Tyler is 8.8h.UV index
In Tyler, the average daily maximum UV index in September is 6. A UV Index of 6 to 7 symbolizes a high threat to health from unprotected exposure to Sun's UV rays for the average person.Note: The UV index of 6 during September translates into the following guidance:
Follow precautions and abide by sun safety rules. Deterrence of sunburn is imperative. 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. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays. Take heed! The reflection of snow can intensify the Sun's UV radiation nearly double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Tyler, TX
- Average high temperature in September: 88.2°F
The warmest month (with the highest average high temperature) is August (95°F).
The month with the lowest average high temperature is January (54.7°F).
- Average low temperature in September: 67.6°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 (38.8°F).
Average pressure in September
Tyler, TX
- Average pressure in September: 29.97"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in September
Tyler, TX
- Average wind speed in September: 5.5mph
The windiest month (with the highest average wind speed) is March (7.7mph).
The calmest month (with the lowest average wind speed) is September (5.5mph).
Average humidity in September
Tyler, TX
- Average humidity in September: 69%
The month with the highest relative humidity is February (79%).
The month with the lowest relative humidity is August (65%).
Average rainfall in September
Tyler, TX
- Average rainfall in September: 1.61"
The wettest month (with the highest rainfall) is April (2.99").
The driest month (with the least rainfall) is August (1.54").
Average rainfall days in September
Tyler, TX
- Average rainfall days in September: 14.1 days
The month with the highest number of rainy days is September (14.1 days).
The month with the least rainy days is January (9.3 days).
Average snowfall in September
Tyler, TX
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.55").
The months with the least snowfall are April, May, June, July, August, September, October and December (0").
Average snowfall days in September
Tyler, TX
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is February (1.4 days).
The months with the least snowfall days are April, May, June, July, August and October (0 days).
Average daylight in September /
Average sunshine in September
Tyler, TX
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 12min).
The month with the shortest days is December (Average daylight: 10h and 6min).
- Average sunshine in September: 8h and 48min
The month with the most sunshine is August (Average sunshine: 10h and 48min).
The month with the least sunshine is December (Average sunshine: 5h and 6min).
Average sunshine days in September
Tyler, TX
- Average sunshine days in September: 13.5 days
The month with the most sunshine days is October (20.1 days).
The month with the least sunshine days is September (13.5 days).
Average UV index in September
Tyler, TX
- Average UV index in September: 6
The months with the highest UV index are 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
Tyler, TX
- Average cloud cover in September: 31
The month with the most cloud cover is February (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 26).
Average visibility in September
Tyler, TX
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is May (5mi).
