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
September's onset corresponds with a subtle shift in the average high-temperature, slightly moving from a sweltering 97°F (36.1°C) in August to a hot 90°F (32.2°C). September nights observe an average temperature dip to an agreeable 71.8°F (22.1°C).Heat index
The average heat index in September is estimated at a blisteringly hot 104°F (40°C). Implement additional safety measures to avoid heat cramps and heat exhaustion. Persistent activity might trigger heatstroke.Heat index details are generally centered around shaded locations and a mild breeze. With exposure to direct sunshine, the heat index could climb by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', binds temperature metrics with humidity values to give a sense of the actual warmth. The effect of weather is individual, with a variety of people experiencing it differently due to distinctions in body mass, height, and level of activity. Being under direct sunshine can magnify the heat experience, possibly pushing up the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Kids are usually in more danger than grown-ups as they tend to sweat less. Plus, their bigger skin surface in relation to their small frames and increased heat generation due to their activity level make them more susceptible.
Through perspiration, the body has a natural mechanism to eliminate excessive heat via sweat evaporation. An elevated level of relative humidity hinders evaporation, leading to decreased heat elimination from the body, inducing a sensation of excess heat. Accumulating more heat than the body can dissipate leads to an uptick in body temperature, with potential heat stress consequences.
Humidity
The average relative humidity in September is 66%.Rainfall
In Atascosa, during September, the rain falls for 16.5 days and regularly aggregates up to 3.03" (77mm) of precipitation. Throughout the year, in Atascosa, there are 139.6 rainfall days, and 20.2" (513mm) of precipitation is accumulated.Snowfall
In Atascosa, snow does not fall in March through November.Daylight
The average length of the day in September in Atascosa, Texas, is 12h and 19min.On the first day of September, sunrise is at 7:12 am and sunset at 7:56 pm. On the last day of the month, sunrise is at 7:27 am and sunset at 7:21 pm CDT.
Sunshine
In September, the average sunshine is 8.5h.UV index
In September, the average daily maximum UV index is 6. A UV Index estimate of 6 to 7 represents a high threat to health from unprotected exposure to Sun's UV rays for average individuals.Note: In September, an average UV index of 6 transforms into the following instructions:
Apply measures and align with sun safety principles. Safeguarding against skin and eye injury is pivotal. The Sun's UV radiation is most potent between the hours of 10 a.m. and 4 p.m. Try to avoid direct sunlight during this time. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck.
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 much does it rain in September?
When it does not snow?
What is the average length of the day in September?
When is the sunrise / sunset in September?
How many hours of sunshine does Atascosa have in September?
What is the UV index reading in September?
Average temperature in September
Atascosa, TX
- Average high temperature in September: 90°F
The warmest month (with the highest average high temperature) is August (97°F).
The month with the lowest average high temperature is January (62.2°F).
- Average low temperature in September: 71.8°F
The month with the highest average low temperature is August (76.3°F).
The coldest month (with the lowest average low temperature) is January (44.8°F).
Average pressure in September
Atascosa, TX
- Average pressure in September: 29.94"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in September
Atascosa, TX
- Average wind speed in September: 6.8mph
The windiest month (with the highest average wind speed) is May (9.4mph).
The calmest month (with the lowest average wind speed) is September (6.8mph).
Average humidity in September
Atascosa, TX
- Average humidity in September: 66%
The month with the highest relative humidity is May (71%).
The month with the lowest relative humidity is August (58%).
Average rainfall in September
Atascosa, TX
- Average rainfall in September: 3.03"
The wettest month (with the highest rainfall) is May (3.15").
The driest month (with the least rainfall) is February (0.94").
Average rainfall days in September
Atascosa, TX
- Average rainfall days in September: 16.5 days
The month with the highest number of rainy days is September (16.5 days).
The month with the least rainy days is January (8.6 days).
Average snowfall in September
Atascosa, TX
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.08").
The months with the least snowfall are March, April, May, June, July, August, September, October and November (0").
Average snowfall days in September
Atascosa, TX
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (0.3 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
Atascosa, TX
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 0min).
The month with the shortest days is December (Average daylight: 10h and 18min).
- Average sunshine in September: 8h and 3min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is December (Average sunshine: 5h and 24min).
Average sunshine days in September
Atascosa, TX
- Average sunshine days in September: 12.6 days
The month with the most sunshine days is January (20.8 days).
The month with the least sunshine days is May (12.5 days).
Average UV index in September
Atascosa, 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
Atascosa, TX
- Average cloud cover in September: 32
The month with the most cloud cover is March (Cloud cover 45).
The month with the least cloud cover is August (Cloud cover 21).
Average visibility in September
Atascosa, 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).
Atascosa, Texas, USA
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