September weather forecast
Austin, TX

The beautiful Lady Bird Lake passing through the city skyscrapers of Austin city, Texas
The beautiful Lady Bird Lake passing through the city skyscrapers of Austin city, Texas

Weather in September

The first month of the autumn, September, is still a tropical month in Austin, Texas, with temperature in the range of an average high of 88.2°F (31.2°C) and an average low of 70.9°F (21.6°C).

Temperature

In Austin, the average high-temperature in September slightly decreases, from a torrid 96.4°F (35.8°C) in August, to a hot 88.2°F (31.2°C). The average low-temperature, in Austin, is 70.9°F (21.6°C).

Heat index

In September, the average heat index is appraised at a very hot 99.5°F (37.5°C). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Note that heat index values are valued for light wind and location in the shade. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'real feel', 'felt air temperature', or 'feels like', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (wind, metabolic differences, pregnancy). Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 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. High relative humidity reduces the evaporation rate, resulting in a lower heat removal rate from the body, causing the perception of being overheated. If the body can not disperse the excessive heat and body temperature reaches conditions of hyperthermia, above 99.5°F (37.5°C) to 100.9°F (38.3°C), thermal conditions are potentially life-threatening.

Humidity

In Austin, the average relative humidity is 68%.

Rainfall

In September, in Austin, the rain falls for 15.1 days. Throughout September, 2.52" (64mm) of precipitation is accumulated. 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 Austin, the average length of the day is 12.3h.

Sunshine

The average sunshine in Austin is 8.4h.

UV index

The average daily maximum UV index in Austin, Texas, is 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to the Sun's UV rays for the ordinary person.
Note: The average daily UV index of 6 in September transform into the following instructions:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the temperature in September in Austin?

The average high-temperature, in September, is 88.2°F (31.2°C), while the average low-temperature is 70.9°F (21.6°C). In September, the average heat index (a.k.a. 'feels like', 'real feel'), which calculates the temperature value influenced by the moisture in the air, is appraised at 99.5°F (37.5°C).

What is the average humidity in September in Austin?

In Austin, the average relative humidity in September is 68%.

How much does it rain in Austin in September?

In Austin, Texas, in September, it is raining for 15.1 days, with typically 2.52" (64mm) of accumulated precipitation.

When it does not snow in Austin?

In Austin, Texas, snow does not fall in March through December.

How many hours of daylight does Austin have in September?

In Austin, Texas, the average length of the day in September is 12.3h.

How long on average sun shines in September in Austin?

In Austin, the average sunshine in September is 8.4h.

What is the UV index intensity in September in Austin?

In September, the average daily maximum UV index in Austin is 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from the exposure to the Sun's UV radiation.

Average temperature in September
Austin, TX

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).

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Average pressure in September
Austin, TX

Average pressure in September - Austin, TX
  • Average pressure in September: 29.96"

The month with the highest atmospheric pressure is January (30.15").
The month with the lowest atmospheric pressure is June (29.91").

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Average wind speed in September
Austin, TX

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).

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Average humidity in September
Austin, TX

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%).

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Average rainfall in September
Austin, TX

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").

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Average rainfall days in September
Austin, TX

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).

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Average snowfall in September
Austin, TX

Average snowfall in September - Austin, TX
  • Average snowfall in September: 0"

The month with the highest snowfall is January (0.4").
Months with the least snowfall are March, April, May, June, July, August, September, October, November and December (0").

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Average snowfall days in September
Austin, TX

Average snowfall days in September - Austin, TX
  • Average snowfall days in September: 0 days

Months with the highest number of snowfall days are January and February (0.3 days).
Months with the least snowfall days are March, April, May, June, July, August, September, October and December (0 days).

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Average daylight in September /
Average sunshine in September
Austin, TX

Average daylight in September / Average sunshine in September - Austin, TX
  • Average daylight in September: 12.3h

The month with the longest days is June (Average daylight: 14.1h).
The month with the shortest days is December (Average daylight: 10.2h).

  • Average sunshine in September: 8.4h

Months with the most sunshine are July and August (Average sunshine: 10.3h).
The month with the least sunshine is December (Average sunshine: 5.3h).

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Average sunshine days in September
Austin, TX

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).

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Average UV index in September
Austin, TX

Average UV index in September - Austin, TX
  • Average UV index in September: 6

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).

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Average cloud cover in September
Austin, TX

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).

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Average visibility in September
Austin, TX

Average visibility in September - Austin, TX
  • Average visibility in September: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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