September weather forecast
The Woodlands, TX

Weather in September

September, the first month of the autumn, in The Woodlands, is still a tropical month, with average temperature varying between 89.4°F (31.9°C) and 71.8°F (22.1°C).

Temperature

In September, the average high-temperature marginally drops, from a torrid 96.1°F (35.6°C) in August, to a hot 89.4°F (31.9°C). The average low-temperature, in The Woodlands, is 71.8°F (22.1°C).

Heat index

In September, the average heat index is computed to be a blistering 105.4°F (40.8°C). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'apparent temperature', 'real feel', or 'feels like', is a measure that combines air temperature and relative humidity into a single value that indicates how hot the weather feels. Additional factors like pregnancy, wind, differences in body mass, height, and shape, and activity influence one's weather impression. 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 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.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. When the relative humidity is high, the evaporation rate is reduced. The warmth is removed from the body at a lower rate, causing the body to retain more heat than it would in dry air. 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 The Woodlands, the average relative humidity is 72%.

Rainfall

In The Woodlands, during September, the rain falls for 19.1 days and regularly aggregates up to 3.54" (90mm) of precipitation. Throughout the year, in The Woodlands, there are 178.1 rainfall days, and 34.25" (870mm) of precipitation is accumulated.

Snowfall

March through November are months without snowfall in The Woodlands.

Daylight

The average length of the day in September is 12.3h.

Sunshine

In The Woodlands, Texas, the average sunshine is 8.5h.

UV index

In September, the average daily maximum UV index 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 average individuals.
Note: In September, the average maximum UV index of 6 translate into the following recommendations:
Take precautions against overexposure. Protection against sun damage is needed. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. 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 The Woodlands?

In The Woodlands, Texas, in September, the average high-temperature is 89.4°F (31.9°C), and the average low-temperature is 71.8°F (22.1°C). In September, the average heat index (a.k.a. 'real feel', 'feels like'), which factors the actual air temperature with the relative humidity, is computed to be 105.4°F (40.8°C).

What is the average humidity in September in The Woodlands?

In September, the average relative humidity is 72%.

How much does it rain in The Woodlands in September?

In The Woodlands, in September, it is raining for 19.1 days, with typically 3.54" (90mm) of accumulated precipitation.

When it does not snow in The Woodlands?

March through November are months without snowfall.

What is the average length of the day in September in The Woodlands?

The average length of the day in September is 12.3h.

How many hours of sunshine does The Woodlands have in September?

In September, the average sunshine in The Woodlands, Texas, is 8.5h.

What is the UV index reading in September in The Woodlands?

The average daily maximum UV index in September in The Woodlands is 6. A UV Index estimate of 6 to 7 represents a high health risk from unsafe exposure to the Sun's UV rays.

Average temperature in September
The Woodlands, TX

Average temperature in September - The Woodlands, TX
  • Average high temperature in September: 89.4°F

The warmest month (with the highest average high temperature) is August (96.1°F).
The month with the lowest average high temperature is January (60.1°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 (43.9°F).

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Average pressure in September
The Woodlands, TX

Average pressure in September - The Woodlands, TX
  • Average pressure in September: 29.96"

The month with the highest atmospheric pressure is January (30.16").
The month with the lowest atmospheric pressure is June (29.93").

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Average wind speed in September
The Woodlands, TX

Average wind speed in September - The Woodlands, TX
  • Average wind speed in September: 5.4mph

The windiest month (with the highest average wind speed) is April (7.6mph).
The calmest month (with the lowest average wind speed) is September (5.4mph).

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Average humidity in September
The Woodlands, TX

Average humidity in September - The Woodlands, TX
  • Average humidity in September: 72%

The month with the highest relative humidity is February (78%).
The month with the lowest relative humidity is August (67%).

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Average rainfall in September
The Woodlands, TX

Average rainfall in September - The Woodlands, TX
  • Average rainfall in September: 3.54"

The wettest month (with the highest rainfall) is May (4.33").
The driest month (with the least rainfall) is November (1.89").

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Average rainfall days in September
The Woodlands, TX

Average rainfall days in September - The Woodlands, TX
  • Average rainfall days in September: 19.1 days

The month with the highest number of rainy days is September (19.1 days).
The month with the least rainy days is January (12.1 days).

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Average snowfall in September
The Woodlands, TX

Average snowfall in September - The Woodlands, TX
  • Average snowfall in September: 0"

The month with the highest snowfall is January (0.16").
Months with the least snowfall are March, April, May, June, July, August, September, October and November (0").

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Average snowfall days in September
The Woodlands, TX

Average snowfall days in September - The Woodlands, TX
  • Average snowfall days in September: 0 days

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

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Average daylight in September /
Average sunshine in September
The Woodlands, TX

Average daylight in September / Average sunshine in September - The Woodlands, 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: 8.5h

The month with the most sunshine is August (Average sunshine: 10.1h).
The month with the least sunshine is December (Average sunshine: 4.9h).

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Average sunshine days in September
The Woodlands, TX

Average sunshine days in September - The Woodlands, TX
  • Average sunshine days in September: 9.1 days

The month with the most sunshine days is October (17.1 days).
The month with the least sunshine days is September (9.1 days).

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Average UV index in September
The Woodlands, TX

Average UV index in September - The Woodlands, TX
  • Average UV index in September: 6

Months with the highest UV index are May, 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
The Woodlands, TX

Average cloud cover in September - The Woodlands, TX
  • Average cloud cover in September: 34

The month with the most cloud cover is February (Cloud cover 53).
The month with the least cloud cover is August (Cloud cover 31).

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Average visibility in September
The Woodlands, TX

Average visibility in September - The Woodlands, TX
  • Average visibility in September: 6mi

Months with the highest visibility are January, June, August, September, October, November and December (6mi).
Months with the lowest visibility are February, March, April, May and July (5mi).

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