September weather forecast and climate
Westlake, TX

Weather in September

The first month of the autumn, September, is still a hot month in Westlake, Texas, with temperature in the range of an average low of 70.3°F (21.3°C) and an average high of 87.8°F (31°C).

Temperature

In September, the average high-temperature marginally drops, from a very hot 96.3°F (35.7°C) in August, to a tropical 87.8°F (31°C). In Westlake, in September, the average low-temperature is 70.3°F (21.3°C).

Heat index

The average heat index is computed to be a torrid 95.7°F (35.4°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', 'felt air temperature', 'real feel', or 'feels like', is a measure of how hot it feels when the actual air humidity is factored in. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (clothing, metabolic differences, wind). Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. 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 cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. Under high air temperature and humidity (high heat index) conditions, perspiration is limited, and the perception of heat is increased. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

In Westlake, Texas, the average relative humidity in September is 62%.

Rainfall

In Westlake, in September, during 12.8 rainfall days, 2.09" (53mm) of precipitation is typically accumulated. Throughout the year, there are 123.4 rainfall days, and 24.45" (621mm) of precipitation is accumulated.

Snowfall

April through November are months without snowfall.

Daylight

The average length of the day in Westlake, Texas, is 12.4h.

Sunshine

In Westlake, the average sunshine is 8.4h.

UV index

The average daily maximum UV index is 6. A UV Index reading of 6 to 7 represents a high health risk from unprotected exposure to the Sun's UV rays for the average person.
Note: The daily maximum UV index of 6 in September interpret into the following advice:
Take precautions and utilize sun safety practices. Protection against the skin and eye damage is required. 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. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the temperature in September in Westlake?

The average high-temperature, in September, is 87.8°F (31°C), while the average low-temperature is 70.3°F (21.3°C). The average heat index (a.k.a. 'felt air temperature', 'real feel'), which calculates the temperature value influenced by the moisture in the air, in September is computed to be 95.7°F (35.4°C).

What is the average humidity in September in Westlake?

The average relative humidity in September in Westlake is 62%.

How much does it rain in Westlake in September?

In Westlake, during September, the rain falls for 12.8 days and regularly aggregates up to 2.09" (53mm) of precipitation.

When it does not snow in Westlake?

In Westlake snow does not fall in April through November.

What is the average length of the day in September in Westlake?

In September, the average length of the day in Westlake is 12.4h.

How long on average sun shines in September in Westlake?

The average sunshine in September is 8.4h.

How high is the UV index in September in Westlake?

The average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to the Sun's UV rays.

Average temperature in September
Westlake, TX

Average temperature in September - Westlake, TX
  • Average high temperature in September: 87.8°F

The warmest month (with the highest average high temperature) is August (96.3°F).
The month with the lowest average high temperature is January (54.5°F).

  • Average low temperature in September: 70.3°F

Months with the highest average low temperature are July and August (76.6°F).
The coldest month (with the lowest average low temperature) is January (38.8°F).

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Average pressure in September
Westlake, TX

Average pressure in September - Westlake, TX
  • Average pressure in September: 29.97"

The month with the highest atmospheric pressure is January (30.16").
The month with the lowest atmospheric pressure is June (29.9").

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Average wind speed in September
Westlake, TX

Average wind speed in September - Westlake, TX
  • Average wind speed in September: 6.8mph

The windiest month (with the highest average wind speed) is April (10.2mph).
The calmest month (with the lowest average wind speed) is September (6.8mph).

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Average humidity in September
Westlake, TX

Average humidity in September - Westlake, TX
  • Average humidity in September: 62%

The month with the highest relative humidity is May (71%).
The month with the lowest relative humidity is August (54%).

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Average rainfall in September
Westlake, TX

Average rainfall in September - Westlake, TX
  • Average rainfall in September: 2.09"

The wettest month (with the highest rainfall) is May (3.5").
The driest month (with the least rainfall) is January (1.1").

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Average rainfall days in September
Westlake, TX

Average rainfall days in September - Westlake, TX
  • Average rainfall days in September: 12.8 days

The month with the highest number of rainy days is May (14.8 days).
The month with the least rainy days is January (5.6 days).

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Average snowfall in September
Westlake, TX

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

The month with the highest snowfall is February (0.35").
Months with the least snowfall are April, May, June, July, August, September, October and November (0").

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Average snowfall days in September
Westlake, TX

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

The month with the highest number of snowfall days is February (0.8 days).
Months with the least snowfall days are April, May, June, July, August, September and October (0 days).

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

Average daylight in September / Average sunshine in September - Westlake, TX
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.3h).
The month with the shortest days is December (Average daylight: 10h).

  • Average sunshine in September: 8.4h

The month with the most sunshine is July (Average sunshine: 11h).
The month with the least sunshine is December (Average sunshine: 5.7h).

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Average sunshine days in September
Westlake, TX

Average sunshine days in September - Westlake, TX
  • Average sunshine days in September: 15.4 days

The month with the most sunshine days is January (24.6 days).
The month with the least sunshine days is May (13.8 days).

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Average UV index in September
Westlake, TX

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

Months with the highest UV index are May, June, July and August (UV index 7).
Months with the lowest UV index are January and December (UV index 3).

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Average cloud cover in September
Westlake, TX

Average cloud cover in September - Westlake, TX
  • Average cloud cover in September: 29

The month with the most cloud cover is March (Cloud cover 40).
The month with the least cloud cover is August (Cloud cover 20).

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Average visibility in September
Westlake, TX

Average visibility in September - Westlake, 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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