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
With the commencement of September, Nacogdoches records a moderate temperature decline, with the average high easing from August's torrid 95.5°F (35.3°C) to a hot 88.9°F (31.6°C). During September, the temperature tends to dip to an average of 67.6°F (19.8°C) at night.Heat index
For September, the heat index is estimated at a blisteringly hot 104°F (40°C). More safety actions are required, heat exhaustion and heat cramps are probable. Long-term activity may precipitate heatstroke.From a standpoint of the heat index, values pertain to shaded conditions and mild breezes. Direct sunlight might cause an increase of up to 15 Fahrenheit (8 Celsius) degrees in the heat index.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', arises from combining readings of air temperature and relative moisture content. An individual's temperature experience can be influenced by extra factors, including metabolic differences, activity levels, and clothing. 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. 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. With a high level of moisture in the air, the evaporation process becomes less efficient, preventing the body from cooling down efficiently and resulting in a sensation of overheating. Elevated heat gain compared to the body's release capability poses risks of dehydration and potential overheating.
Humidity
In Nacogdoches, Texas, the average relative humidity in September is 72%.Rainfall
In Nacogdoches, in September, it is raining for 14.1 days, with typically 2.72" (69mm) of accumulated precipitation. Throughout the year, there are 159.2 rainfall days, and 35.12" (892mm) of precipitation is accumulated.Snowfall
In Nacogdoches, snow does not fall in April through November.Daylight
The average length of the day in September is 12h and 21min.On the first day of September, sunrise is at 6:54 am and sunset at 7:41 pm. On the last day of the month, sunrise is at 7:12 am and sunset at 7:04 pm CDT.
Sunshine
In Nacogdoches, the average sunshine in September is 8.8h.UV index
In Nacogdoches, the average daily maximum UV index in September is 6. A UV Index of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV radiation for ordinary individuals.Note: In September, the maximum UV index of 6 suggests this advice:
Conform to measures and uphold sun safety traditions. Warding off skin and eye harm is necessary. Remember that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. Make an effort to avoid direct sun exposure during these hours. During bright days, sunglasses that offer UVA and UVB defense are recommended.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is it in September?
What is the average humidity in September?
How many days does it rain in September?
When it does not snow?
What is the average length of the day in September?
When are sunrise and sunset in September?
How many hours of sunshine does Nacogdoches have in September?
How high is the UV index in September?
Average temperature in September
Nacogdoches, TX
- Average high temperature in September: 88.9°F
The warmest month (with the highest average high temperature) is August (95.5°F).
The month with the lowest average high temperature is January (55.9°F).
- Average low temperature in September: 67.6°F
The months with the highest average low temperature are July and August (73°F).
The coldest month (with the lowest average low temperature) is January (39.2°F).
Average pressure in September
Nacogdoches, TX
- Average pressure in September: 29.97"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Nacogdoches, TX
- Average wind speed in September: 4.8mph
The windiest month (with the highest average wind speed) is April (6.8mph).
The calmest months (with the lowest average wind speed) are July, August and September (4.8mph).
Average humidity in September
Nacogdoches, TX
- Average humidity in September: 72%
The month with the highest relative humidity is February (82%).
The month with the lowest relative humidity is August (69%).
Average rainfall in September
Nacogdoches, TX
- Average rainfall in September: 2.72"
The wettest month (with the highest rainfall) is May (3.74").
The driest month (with the least rainfall) is November (2.24").
Average rainfall days in September
Nacogdoches, TX
- Average rainfall days in September: 14.1 days
The months with the highest number of rainy days are March and June (14.5 days).
The month with the least rainy days is November (11 days).
Average snowfall in September
Nacogdoches, TX
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.24").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").
Average snowfall days in September
Nacogdoches, TX
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (0.6 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).
Average daylight in September /
Average sunshine in September
Nacogdoches, TX
- Average daylight in September: 12h and 2min
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 5min
The month with the most sunshine is August (Average sunshine: 10h and 12min).
The month with the least sunshine is December (Average sunshine: 4h and 54min).
Average sunshine days in September
Nacogdoches, TX
- Average sunshine days in September: 12.6 days
The month with the most sunshine days is October (18.5 days).
The month with the least sunshine days is February (12.3 days).
Average UV index in September
Nacogdoches, TX
- 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
Nacogdoches, TX
- Average cloud cover in September: 34
The month with the most cloud cover is February (Cloud cover 52).
The month with the least cloud cover is August (Cloud cover 31).
Average visibility in September
Nacogdoches, TX
- Average visibility in September: 5mi
The month with the highest visibility is August (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, September, October, November and December (5mi).
Nacogdoches, Texas, USA
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