September weather forecast
Killeen, TX

Weather in September

September, the first month of the autumn in Killeen, is still a tropical month, with an average temperature varying between 87.8°F (31°C) and 70.7°F (21.5°C).

Temperature

In September, the average high-temperature slightly decreases from a very hot 96.3°F (35.7°C) in August to a hot 87.8°F (31°C). In Killeen, the average low-temperature is 70.7°F (21.5°C).

Heat index

The average heat index in September is evaluated at a torrid 96.8°F (36°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. 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 'feels like', 'real feel', 'felt air temperature', or 'apparent temperature', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. Additional factors like differences in body mass, height, and shape, clothing, metabolic differences, and activity influence one's weather impression. 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 especially crucial for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.
The human body normally cools itself by perspiration, as evaporated sweat carries heat away from the body. With a lot of moisture in the air, the evaporation process is not as effective, and the body does not cool down as efficiently, creating a perception of overheating. 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

The average relative humidity in September in Killeen is 65%.

Rainfall

In Killeen, Texas, during 14.3 rainfall days, 1.97" (50mm) of precipitation is typically accumulated. In Killeen, during the entire year, the rain falls for 130.1 days and collects up to 23.07" (586mm) of precipitation.

Snowfall

In Killeen, snow does not fall in March through December.

Daylight

In September, the average length of the day is 12h and 20min.
On the first day of September, sunrise is at 7:07 am and sunset at 7:54 pm. On the last day of the month, sunrise is at 7:23 am and sunset at 7:17 pm CDT.

Sunshine

In September, 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 threat to health from unprotected exposure to Sun's UV rays for average individuals.
Note: The average daily UV index of 6 in September transform into the following instructions:
Take precautions and utilize sun safety practices. Protection against skin and eye damage is required. 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 Killeen?

In Killeen, Texas, in September, the average high-temperature is 87.8°F (31°C), and the average low-temperature is 70.7°F (21.5°C). The average heat index (a.k.a. 'apparent temperature', 'feels like'), which factors the actual air temperature with the relative humidity, in September is evaluated at 96.8°F (36°C).

What is the average humidity in September in Killeen?

In Killeen, Texas, the average relative humidity in September is 65%.

How many days does it rain in September in Killeen?

In Killeen, during September, the rain falls for 14.3 days and regularly aggregates up to 1.97" (50mm) of precipitation.

When it does not snow in Killeen?

March through December are months without snowfall in Killeen.

How many hours of daylight does Killeen have in September?

The average day length in September in Killeen is 12h and 20min.

What time are sunrise and sunset in September in Killeen?

On the first day of September in Killeen, sunrise is at 7:07 am and sunset at 7:54 pm. On the last day of the month, sunrise is at 7:23 am and sunset at 7:17 pm CDT.

How many hours of sunshine does Killeen have in September?

In September, the average sunshine duration in Killeen, Texas, is 8.5h.

What is the UV index intensity in September in Killeen?

In September, the average daily maximum UV index in Killeen, Texas, is 6. A UV Index value of 6 to 7 symbolizes a high health risk from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Killeen, TX

Average temperature in September - Killeen, 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 (58.1°F).

  • Average low temperature in September: 70.7°F

The month with the highest average low temperature is August (76.1°F).
The coldest month (with the lowest average low temperature) is January (41.2°F).

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Average pressure in September
Killeen, TX

Average pressure in September - Killeen, 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).

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Average wind speed in September
Killeen, TX

Average wind speed in September - Killeen, TX
  • Average wind speed in September: 7.1mph

The windiest month (with the highest average wind speed) is March (10.6mph).
The calmest month (with the lowest average wind speed) is September (7.1mph).

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Average humidity in September
Killeen, TX

Average humidity in September - Killeen, TX
  • Average humidity in September: 65%

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

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Average rainfall in September
Killeen, TX

Average rainfall in September - Killeen, TX
  • Average rainfall in September: 1.97"

The wettest month (with the highest rainfall) is October (3.39").
The driest month (with the least rainfall) is November (0.98").

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Average rainfall days in September
Killeen, TX

Average rainfall days in September - Killeen, TX
  • Average rainfall days in September: 14.3 days

The month with the highest number of rainy days is September (14.3 days).
The month with the least rainy days is January (6.6 days).

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Average snowfall in September
Killeen, TX

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

The month with the highest snowfall is February (0.31").
The months with the least snowfall are March, April, May, June, July, August, September, October, November and December (0").

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Average snowfall days in September
Killeen, TX

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

The month with the highest number of snowfall days is February (0.9 days).
The 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
Killeen, TX

Average daylight in September / Average sunshine in September - Killeen, TX
  • Average daylight in September: 12h and 20min

The month with the longest days is June (Average daylight: 14h and 8min).
The month with the shortest days is December (Average daylight: 10h and 10min).

  • Average sunshine in September: 8h and 30min

The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is December (Average sunshine: 5h and 24min).

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Average sunshine days in September
Killeen, TX

Average sunshine days in September - Killeen, TX
  • Average sunshine days in September: 13.5 days

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

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Average UV index in September
Killeen, TX

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

The months with the highest UV index are 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
Killeen, TX

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

The month with the most cloud cover is March (Cloud cover 42).
The month with the least cloud cover is August (Cloud cover 21).

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Average visibility in September
Killeen, TX

Average visibility in September - Killeen, 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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