September weather forecastChappell Hill, TX
September
Weather in September
September, the first month of the autumn in Chappell Hill, is still a tropical month, with an average temperature fluctuating between 88.7°F (31.5°C) and 70.5°F (21.4°C).Temperature
September's onset introduces a mild reduction in the average high-temperature, from a sweltering 95.4°F (35.2°C) in August to a tropical 88.7°F (31.5°C). Chappell Hill experiences an average low-temperature of 70.5°F (21.4°C) in month of September.Heat index
The heat index for September is calculated to be a scorching 104°F (40°C). Adopt heightened preventive measures, heat exhaustion and heat cramps are probable. Persistent activity could lead to heatstroke.One should be cognizant that the heat index values are tailored for shaded spots and mild winds. The heat index may experience an enhancement of 15 Fahrenheit (8 Celsius) degrees under direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'real feel', takes into account both air temperature and humidity to illustrate what people actually feel. The impact of weather is personal, differing among a variety of people based on differences in body mass, height, and the level of physical exertion. With direct sunlight, be aware that it might enhance the heat sensation, raising the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for children. Young ones often underestimate the need for rest and rehydration. Thirst appears late in dehydration - hence, it is important to keep hydrated, particularly during prolonged physical activities.
In high temperatures, perspiration kicks in, allowing the human body to cool down through the evaporation of sweat. Elevated relative humidity diminishes evaporation, thereby reducing the body's ability to shed heat and creating a feeling of being too warm. Overheating can ensue when the body accumulates more heat than it can release, and dehydration severity may vary.
Humidity
In Chappell Hill, the average relative humidity in September is 74%.Rainfall
In Chappell Hill, in September, it is raining for 16.1 days, with typically 1.85" (47mm) of accumulated precipitation. In Chappell Hill, during the entire year, the rain falls for 141.3 days and collects up to 17.4" (442mm) of precipitation.Snowfall
February through November are months without snowfall.Daylight
The average length of the day in September is 12h and 20min.On the first day of the month, sunrise is at 7:02 am and sunset at 7:47 pm. On the last day of September, sunrise is at 7:18 am and sunset at 7:11 pm CDT.
Sunshine
The average sunshine in September is 8.6h.UV index
The average daily maximum UV index in September is 6. A UV Index reading of 6 to 7 represents a high health vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: During September, 6 as the daily maximum UV index converts into the following advice:
Enforce precautions and stick to sun safety measures. Preservation from skin and eye damage is essential. Avoid direct sunlight between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Keep in mind that shade structures may not provide complete protection. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Chappell Hill, TX
- Average high temperature in September: 88.7°F
The warmest month (with the highest average high temperature) is August (95.4°F).
The month with the lowest average high temperature is January (59.2°F).
- Average low temperature in September: 70.5°F
The month with the highest average low temperature is August (74.8°F).
The coldest month (with the lowest average low temperature) is January (43.3°F).
Average pressure in September
Chappell Hill, TX
- Average pressure in September: 29.96"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
Chappell Hill, TX
- Average wind speed in September: 5.8mph
The windiest months (with the highest average wind speed) are February and March (8.5mph).
The calmest month (with the lowest average wind speed) is September (5.8mph).
Average humidity in September
Chappell Hill, TX
- Average humidity in September: 74%
The months with the highest relative humidity are March and May (79%).
The month with the lowest relative humidity is August (68%).
Average rainfall in September
Chappell Hill, TX
- Average rainfall in September: 1.85"
The wettest month (with the highest rainfall) is May (3.03").
The driest months (with the least rainfall) are February and November (0.83").
Average rainfall days in September
Chappell Hill, TX
- Average rainfall days in September: 16.1 days
The month with the highest number of rainy days is September (16.1 days).
The month with the least rainy days is January (9.3 days).
Average snowfall in September
Chappell Hill, TX
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.12").
The months with the least snowfall are February, March, April, May, June, July, August, September, October and November (0").
Average snowfall days in September
Chappell Hill, TX
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is December (0.5 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October and November (0 days).
Average daylight in September /
Average sunshine in September
Chappell Hill, TX
- Average daylight in September: 12h and 18min
The month with the longest days is June (Average daylight: 14h and 6min).
The month with the shortest days is December (Average daylight: 10h and 12min).
- Average sunshine in September: 8h and 36min
The month with the most sunshine is August (Average sunshine: 10h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 0min).
Average sunshine days in September
Chappell Hill, TX
- Average sunshine days in September: 11.4 days
The month with the most sunshine days is January (19.2 days).
The month with the least sunshine days is June (10.7 days).
Average UV index in September
Chappell Hill, 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 3).
Average cloud cover in September
Chappell Hill, TX
- Average cloud cover in September: 33
The month with the most cloud cover is February (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility in September
Chappell Hill, TX
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, August, September, October, November and December (6mi).
The months with the lowest visibility are May, June and July (5mi).
