September weather forecast
Flat, TX

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Weather in September

The first month of the autumn, September, is also a hot month in Flat, Texas, with temperature in the range of an average high of 87.6°F (30.9°C) and an average low of 70.7°F (21.5°C).

Temperature

With the arrival of September, Flat notices a mild change in the average high-temperature, sliding from August's torrid 95.5°F (35.3°C) to a hot 87.6°F (30.9°C). Throughout the month of September, the average temperature dips to a pleasant 70.7°F (21.5°C) at night.

Heat index

September's heat index is calculated to be a torrid 96.8°F (36°C). Implement more preventive measures, heat cramps and heat exhaustion are probable. Heatstroke might result from extended activity.
Heat index details are generally centered around shaded locations and a mild breeze. Exposure to the direct sun could elevate the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', marries air temperature and humidity to produce a value illustrating perceived warmth. The individual's impression of temperature can be shaped by additional aspects such as metabolic variations, physical activity, and clothing. Do note, being directly under sun rays can amplify the heat you feel, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. Young children typically face greater hazards than adults because they do not sweat as much. Their larger skin surface in comparison to their little bodies and the high heat production from their active nature compounds their vulnerability.
Perspiring is the body's way of cooling down, particularly by allowing sweat to evaporate and take the heat with it. With high air temperature and humidity (high heat index) conditions, sweat production is restricted, leading to an amplified perception of heat. If heat absorption exceeds the body's cooling ability, body temperature can elevate, resulting in potential thermal illnesses.

Humidity

In Flat, the average relative humidity in September is 64%.

Rainfall

In Flat, during September, the rain falls for 13.8 days and regularly aggregates up to 2.4" (61mm) of precipitation. Throughout the year, there are 129.1 rainfall days, and 25.71" (653mm) of precipitation is accumulated.

Snowfall

In Flat, snow does not fall in April through November.

Daylight

The average length of the day in September is 12h and 20min.
On the first day of the month, sunrise is at 7:06 am and sunset at 7:53 pm. On the last day of September, in Flat, sunrise is at 7:24 am and sunset at 7:16 pm CDT.

Sunshine

The average sunshine in September is 8.5h.

UV index

In September, the average daily maximum UV index is 6. A UV Index of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV radiation for the ordinary person.
Note: In September, the UV index of 6 transforms into the following advice:
Sidestep overexposure. Individuals with fair complexions risk burning in fewer than 20 minutes. Remember that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. Make an effort to avoid direct sun exposure during these hours. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration.
Updated: Aug 21, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How hot does it get in September?

The average high-temperature, in September, in Flat, is 87.6°F (30.9°C), while the average low-temperature is 70.7°F (21.5°C). In September, the average heat index (a.k.a. 'real feel', 'feels like'), which represents the influence of relative humidity on air temperature, is calculated to be 96.8°F (36°C).

What is the average humidity in September?

In Flat, the average relative humidity in September is 64%.

How many days does it rain in September?

In Flat, Texas, during September, the rain falls for 13.8 days and regularly aggregates up to 2.4" (61mm) of precipitation.

When it does not snow?

In Flat, snow does not fall in April through November.

What is the average length of the day in September?

In September, the average day length is 12h and 20min.

When are sunrise and sunset in September?

On the first day of September in Flat, sunrise is at 7:06 am and sunset at 7:53 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 7:16 pm CDT.

How many hours of sunshine does Flat have in September?

The average sunshine duration in September is 8.5h.

How high is the UV index in September?

In September, the average daily maximum UV index is 6. A UV Index estimate of 6 to 7 represents a high hazard to health from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Flat, TX

Average temperature in September - Flat, TX
  • Average high temperature in September: 87.6°F

The warmest month (with the highest average high temperature) is August (95.5°F).
The month with the lowest average high temperature is January (57°F).

  • Average low temperature in September: 70.7°F

The month with the highest average low temperature is August (75.7°F).
The coldest month (with the lowest average low temperature) is January (40.6°F).

Average pressure in September
Flat, TX

Average pressure in September - Flat, TX
  • Average pressure in September: 29.96"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

Average wind speed in September
Flat, TX

Average wind speed in September - Flat, TX
  • Average wind speed in September: 7.3mph

The windiest month (with the highest average wind speed) is March (11mph).
The calmest month (with the lowest average wind speed) is September (7.3mph).

Average humidity in September
Flat, TX

Average humidity in September - Flat, TX
  • Average humidity in September: 64%

The month with the highest relative humidity is May (74%).
The month with the lowest relative humidity is August (56%).

Average rainfall in September
Flat, TX

Average rainfall in September - Flat, TX
  • Average rainfall in September: 2.4"

The wettest month (with the highest rainfall) is October (3.86").
The driest month (with the least rainfall) is November (1.18").

Average rainfall days in September
Flat, TX

Average rainfall days in September - Flat, TX
  • Average rainfall days in September: 13.8 days

The month with the highest number of rainy days is May (14.8 days).
The month with the least rainy days is January (6.9 days).

Average snowfall in September
Flat, TX

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

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

Average snowfall days in September
Flat, TX

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

The month with the highest number of snowfall days is February (1.2 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

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

Average daylight in September / Average sunshine in September - Flat, TX
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 12min).
The month with the shortest days is December (Average daylight: 10h and 12min).

  • Average sunshine in September: 8h and 3min

The month with the most sunshine is July (Average sunshine: 10h and 54min).
The month with the least sunshine is December (Average sunshine: 5h and 30min).

Average sunshine days in September
Flat, TX

Average sunshine days in September - Flat, TX
  • Average sunshine days in September: 13.9 days

The month with the most sunshine days is January (22.3 days).
The month with the least sunshine days is May (13.5 days).

Average UV index in September
Flat, TX

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

The month with the highest UV index is July (UV index 8).
The month with the lowest UV index is December (UV index 3).

Average cloud cover in September
Flat, TX

Average cloud cover in September - Flat, TX
  • Average cloud cover in September: 30

The month with the most cloud cover is March (Cloud cover 40).
The month with the least cloud cover is August (Cloud cover 21).

Average visibility in September
Flat, TX

Average visibility in September - Flat, 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).

Flat, Texas, USA

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