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
A moderate decline in average high-temperatures is noted in September, moving from a very hot 96.4°F (35.8°C) in August to a hot 88.2°F (31.2°C). Austin's September nights cool down to an average low-temperature of 70.9°F (21.6°C).Heat index
September's mean heat index is calculated to be a fiery hot 100.4°F (38°C). Additional precautions are required to avert heat cramps and heat exhaustion. Persistent activity may culminate in heatstroke.Note that heat index values are valued for light wind and location in the shade. Facing direct sunlight may hike up the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', combines air temperature and relative humidity to represent a human perceived temperature equivalent. The influence of weather is personal, with a diverse population experiencing it differently due to differences in body mass, stature, and degree 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 especially crucial for babies and toddlers. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
The human body normally cools itself by perspiration, as evaporated sweat carries heat away from the body. In conditions of both high temperature and humidity (a high heat index), sweating is limited and the perception of heat is enhanced. Potential thermal conditions emerge as the body's heat gain outpaces its cooling mechanisms.
Humidity
The average relative humidity in September is 68%.Rainfall
In Austin, in September, it is raining for 15.1 days, with typically 2.52" (64mm) of accumulated precipitation. Throughout the year, there are 142.7 rainfall days, and 21.5" (546mm) of precipitation is accumulated.Snowfall
In Austin, snow does not fall in March through December.Daylight
In September, the average length of the day is 12h and 20min.On the first day of the month, sunrise is at 7:08 am and sunset at 7:53 pm. On the last day of September, sunrise is at 7:24 am and sunset at 7:17 pm CDT.
Sunshine
The average sunshine in September is 8.4h.UV index
The average daily maximum UV index in September is 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The maximum daily UV index, 6 in September, converts into the following recommendations:
Resist overexposure. Safeguarding from solar damage is indispensable. During the period from 10 a.m. to 4 p.m., UV radiation is highest. Try to avoid direct sunlight during these hours. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is September in Austin?
What is the average humidity in September in Austin?
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 Austin have in September?
What is the UV index reading in September?
Average temperature in September
Austin, TX
- Average high temperature in September: 88.2°F
The warmest month (with the highest average high temperature) is August (96.4°F).
The month with the lowest average high temperature is January (59.4°F).
- Average low temperature in September: 70.9°F
The month with the highest average low temperature is August (75.4°F).
The coldest month (with the lowest average low temperature) is January (42.6°F).
Average pressure in September
Austin, TX
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Austin, TX
- Average wind speed in September: 6.2mph
The windiest month (with the highest average wind speed) is March (9.2mph).
The calmest month (with the lowest average wind speed) is September (6.2mph).
Average humidity in September
Austin, TX
- Average humidity in September: 68%
The month with the highest relative humidity is May (75%).
The month with the lowest relative humidity is August (59%).
Average rainfall in September
Austin, TX
- Average rainfall in September: 2.52"
The wettest month (with the highest rainfall) is May (3.78").
The driest month (with the least rainfall) is February (0.91").
Average rainfall days in September
Austin, TX
- Average rainfall days in September: 15.1 days
The month with the highest number of rainy days is May (16.2 days).
The month with the least rainy days is January (8.2 days).
Average snowfall in September
Austin, TX
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.4").
The months with the least snowfall are March, April, May, June, July, August, September, October, November and December (0").
Average snowfall days in September
Austin, TX
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are January and February (0.3 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October and December (0 days).
Average daylight in September /
Average sunshine in September
Austin, TX
- Average daylight in September: 12h and 2min
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 2min
The months with the most sunshine are July and August (Average sunshine: 10h and 18min).
The month with the least sunshine is December (Average sunshine: 5h and 18min).
Average sunshine days in September
Austin, TX
- Average sunshine days in September: 12.5 days
The month with the most sunshine days is January (20.5 days).
The month with the least sunshine days is May (11.1 days).
Average UV index in September
Austin, 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
Austin, TX
- Average cloud cover in September: 32
The month with the most cloud cover is March (Cloud cover 46).
The month with the least cloud cover is August (Cloud cover 24).
Average visibility in September
Austin, 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).
Austin, Texas, USA
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