September weather forecast
Terrell, TX

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Weather in September

The first month of the autumn, September, is still a hot month in Terrell, Texas, with temperature in the range of an average low of 68.9°F (20.5°C) and an average high of 87.8°F (31°C).

Temperature

The transition into September involves a small decrease in the average high-temperature, dipping slightly from a sweltering 95°F (35°C) in August to a hot 87.8°F (31°C). Throughout the month of September, Terrell observes an average nighttime temperature of 68.9°F (20.5°C).

Heat index

In September, the heat index is computed to be a very hot 96.8°F (36°C). Extra precautions are necessary, heat cramps and heat exhaustion are plausible outcomes. Extended activity could lead to heatstroke.
For clarity, heat index numbers account for light winds and areas under shade. In the presence of direct sunshine, the heat index could be augmented by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', is found by incorporating humidity levels into the air temperature measurement. This effect is personal, shaped by the individual's physical activity and heat sensitivity, influenced by factors including wind, clothing, and metabolic variances. Taking into account that direct sunlight can boost the heat effect, the heat index may rise by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. Young ones are generally at greater risk than adults due to their limited sweating ability. In addition, their large skin surface relative to their small bodies and higher heat production from their activities add to their vulnerability.
The human body keeps its cool primarily through perspiration, as this process enables sweat to evaporate, taking away the excess heat. In the presence of abundant moisture in the atmosphere, the cooling process through evaporation is hindered, causing the body to feel excessively warm. When heat uptake goes beyond the body's cooling mechanisms, there's a surge in body temperature, posing health risks.

Humidity

In September, the average relative humidity in Terrell is 66%.

Rainfall

In Terrell, in September, during 9.5 rainfall days, 0.43" (11mm) of precipitation is typically accumulated. In Terrell, during the entire year, the rain falls for 88.2 days and collects up to 8.43" (214mm) of precipitation.

Snowfall

January, March through December are months without snowfall in Terrell, Texas.

Daylight

In September, the average length of the day in Terrell is 12h and 22min.
On the first day of the month, sunrise is at 7:00 am and sunset at 7:49 pm. On the last day of September, sunrise is at 7:19 am and sunset at 7:10 pm CDT.

Sunshine

In Terrell, Texas, the average sunshine in September is 8.6h.

UV index

In September, the average daily maximum UV index is 6. A UV Index reading of 6 to 7 represents a high health risk from exposure to the Sun's UV radiation for the ordinary person.
Note: A maximum daily UV index of 6 during September morphs into the following directions:
Persist in precautions and follow sun safety policies. Keeping sunburn at bay is imperative. Between 10 a.m. and 4 p.m., the Sun's UV radiation is at its peak. Limit your exposure to direct sunlight during these hours. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.
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Frequently asked questions

How hot does it get in Terrell in September?

Terrell in September has an average high-temperature of 87.8°F (31°C) and an average low-temperature of 68.9°F (20.5°C). In September, the average heat index (a.k.a. 'feels like', 'real feel'), which factors the actual air temperature with the relative humidity, is computed to be 96.8°F (36°C).

What is the average humidity in September in Terrell?

The average relative humidity in September in Terrell is 66%.

How much does it rain in Terrell in September?

In Terrell, Texas, in September, during 9.5 rainfall days, 0.43" (11mm) of precipitation is typically accumulated.

When it does not snow in Terrell?

January, March through December are months without snowfall in Terrell.

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

The average day length in September in Terrell is 12h and 22min.

When is the sunrise / sunset in September in Terrell?

On the first day of September, sunrise is at 7:00 am and sunset at 7:49 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 7:10 pm CDT.

How long on average sun shines in September in Terrell?

In September, the average sunshine duration in Terrell, Texas, is 8.6h.

What is the UV index reading in September in Terrell?

In Terrell, the average daily maximum UV index in September is 6. A UV Index reading of 6 to 7 represents a high hazard to health from exposure to Sun's UV rays.
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
Terrell, TX

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

The warmest month (with the highest average high temperature) is August (95°F).
The month with the lowest average high temperature is January (54.1°F).

  • Average low temperature in September: 68.9°F

The month with the highest average low temperature is July (74.7°F).
The coldest month (with the lowest average low temperature) is January (38.5°F).

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Average pressure in September
Terrell, TX

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

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

The windiest month (with the highest average wind speed) is March (9.3mph).
The calmest month (with the lowest average wind speed) is September (6.3mph).

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Average humidity in September
Terrell, TX

Average humidity in September - Terrell, TX
  • Average humidity in September: 66%

The month with the highest relative humidity is May (77%).
The month with the lowest relative humidity is August (61%).

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Average rainfall in September
Terrell, TX

Average rainfall in September - Terrell, TX
  • Average rainfall in September: 0.43"

The wettest month (with the highest rainfall) is October (1.38").
The driest month (with the least rainfall) is January (0.39").

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Average rainfall days in September
Terrell, TX

Average rainfall days in September - Terrell, TX
  • Average rainfall days in September: 9.5 days

The month with the highest number of rainy days is September (9.5 days).
The month with the least rainy days is January (4.7 days).

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Average snowfall in September
Terrell, TX

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

The month with the highest snowfall is February (0.08").
The months with the least snowfall are January, March, April, May, June, July, August, September, October, November and December (0").

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Average snowfall days in September
Terrell, TX

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

The month with the highest number of snowfall days is February (1.1 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).

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

Average daylight in September / Average sunshine in September - Terrell, 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 4min

The month with the most sunshine is August (Average sunshine: 11h and 12min).
The month with the least sunshine is December (Average sunshine: 5h and 30min).

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Average sunshine days in September
Terrell, TX

Average sunshine days in September - Terrell, TX
  • Average sunshine days in September: 17.1 days

The month with the most sunshine days is January (23.8 days).
The month with the least sunshine days is September (17.1 days).

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Average UV index in September
Terrell, TX

Average UV index in September - Terrell, 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 and December (UV index 3).

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Average cloud cover in September
Terrell, TX

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

The months with the most cloud cover are February and March (Cloud cover 43).
The month with the least cloud cover is August (Cloud cover 21).

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Average visibility in September
Terrell, TX

Average visibility in September - Terrell, 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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Terrell, Texas, USA

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