September weather forecast
Cooper, TX

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Weather in September

September, the first month of the autumn in Cooper, is still a hot month, with an average temperature fluctuating between 67.1°F (19.5°C) and 86.4°F (30.2°C).

Temperature

September's arrival aligns with a minor decrease in average high-temperatures, from August's 93.7°F (34.3°C) to a still tropical 86.4°F (30.2°C). Cooper temperatures generally rest at a low of 67.1°F (19.5°C) during the September nights.

Heat index

September's heat index is calculated to be a torrid 95°F (35°C). Undertake additional precautions, heat cramps and heat exhaustion could happen. Heatstroke could occur from sustained activity.
Note that heat index values are valued for light wind and location in the shade. With direct sunlight, the heat index could increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', is derived by integrating air temperature with the existing relative humidity to express the perceived warmth. One's perception of weather can be shaped by other factors, involving metabolic differences, pregnancy, and physical exertion. You should know that direct sun exposure can heighten weather effects, potentially elevating the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for children. Children often fail to understand the importance of rest and rehydration. Thirst is a late manifestation of dehydration - hence, it is crucial to stay hydrated, especially during ongoing physical activities.
Evaporating sweat, an outcome of perspiration, is key in assisting the human body to moderate its temperature. When there is an excess of moisture in the atmosphere, the efficiency of the evaporation process is lessened, leading to less efficient body cooling and a sensation of overheating. Increasing body temperatures can be a precursor to dehydration if the body can't shed the extra heat.

Humidity

In September, the average relative humidity is 68%.

Rainfall

In Cooper, in September, it is raining for 13.4 days, with typically 2.72" (69mm) of accumulated precipitation. Throughout the year, there are 150.3 rainfall days, and 35.31" (897mm) of precipitation is accumulated.

Snowfall

In Cooper, snow does not fall in April through October and December.

Daylight

The average length of the day in September in Cooper is 12h and 22min.
On the first day of September, sunrise is at 6:57 am and sunset at 7:47 pm. On the last day of the month, sunrise is at 7:16 am and sunset at 7:08 pm CDT.

Sunshine

In Cooper, the average sunshine in September is 8.8h.

UV index

The average daily maximum UV index in September is 6. A UV Index reading of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation for ordinary individuals.
Note: The maximum daily UV index of 6 during September translates into the following directions:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. Seek shade and limit direct Sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its peak, but be aware that not all shade structures provide complete sun protection. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays.
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Frequently asked questions

How hot is September in Cooper?

The high-temperature in Cooper, Texas, during September is 86.4°F (30.2°C) and the low-temperature is 67.1°F (19.5°C). In September, the average heat index (a.k.a. 'felt air temperature', 'feels like'), which takes the relative humidity and factors it into the air temperature reading, is calculated to be 95°F (35°C).

What is the average humidity in September in Cooper?

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

How many days does it rain in September in Cooper?

In September, in Cooper, Texas, the rain falls for 13.4 days. Throughout September, 2.72" (69mm) of precipitation is accumulated.

When it does not snow in Cooper?

In Cooper, Texas, snow does not fall in April through October and December.

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

In September, the average day length in Cooper, Texas, is 12h and 22min.

When is the sunrise / sunset in September in Cooper?

On the first day of September in Cooper, Texas, sunrise is at 6:57 am and sunset at 7:47 pm. On the last day of the month, sunrise is at 7:16 am and sunset at 7:08 pm CDT.

How long on average sun shines in September in Cooper?

The average sunshine duration in September in Cooper is 8.8h.

How high is the UV index in September in Cooper?

The average daily maximum UV index in September in Cooper, Texas, is 6. A UV Index reading of 6 to 7 represents a high health threat from exposure to the Sun's 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
Cooper, TX

Average temperature in September - Cooper, TX
  • Average high temperature in September: 86.4°F

The warmest month (with the highest average high temperature) is August (93.7°F).
The month with the lowest average high temperature is January (52.5°F).

  • Average low temperature in September: 67.1°F

The month with the highest average low temperature is July (73.4°F).
The coldest month (with the lowest average low temperature) is January (37°F).

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Average pressure in September
Cooper, TX

Average pressure in September - Cooper, TX
  • Average pressure in September: 29.98"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).

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Average wind speed in September
Cooper, TX

Average wind speed in September - Cooper, TX
  • Average wind speed in September: 6.3mph

The windiest months (with the highest average wind speed) are February and March (9.3mph).
The calmest months (with the lowest average wind speed) are August and September (6.3mph).

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Average humidity in September
Cooper, TX

Average humidity in September - Cooper, TX
  • Average humidity in September: 68%

The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is August (64%).

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Average rainfall in September
Cooper, TX

Average rainfall in September - Cooper, TX
  • Average rainfall in September: 2.72"

The wettest month (with the highest rainfall) is October (3.98").
The driest month (with the least rainfall) is January (1.89").

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Average rainfall days in September
Cooper, TX

Average rainfall days in September - Cooper, TX
  • Average rainfall days in September: 13.4 days

The month with the highest number of rainy days is March (14.8 days).
The month with the least rainy days is January (9.1 days).

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Average snowfall in September
Cooper, TX

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

The month with the highest snowfall is February (0.98").
The months with the least snowfall are April, May, June, July, August, September, October and December (0").

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Average snowfall days in September
Cooper, TX

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

The month with the highest number of snowfall days is February (1.5 days).
The 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
Cooper, TX

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

The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).

  • Average sunshine in September: 8h and 5min

The month with the most sunshine is August (Average sunshine: 11h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 24min).

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Average sunshine days in September
Cooper, TX

Average sunshine days in September - Cooper, TX
  • Average sunshine days in September: 14.2 days

The month with the most sunshine days is January (19.5 days).
The month with the least sunshine days is April (13.5 days).

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Average UV index in September
Cooper, TX

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

The months with the highest UV index are June, July and August (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 3).

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Average cloud cover in September
Cooper, TX

Average cloud cover in September - Cooper, TX
  • Average cloud cover in September: 28

The month with the most cloud cover is February (Cloud cover 44).
The month with the least cloud cover is August (Cloud cover 22).

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Average visibility in September
Cooper, TX

Average visibility in September - Cooper, 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).

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Cooper, Texas, USA

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