September weather forecast
Waco, TX

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The high Waco Suspension Bridge crossing on the large Brazos River in the Indian Spring Park in Waco, Texas
The high Waco Suspension Bridge crossing on the large Brazos River in the Indian Spring Park in Waco, Texas

Weather in September

September signals a welcomed retreat from the scorching summer heat. Even though rainfall increases to 2.32" (59mm) spread over 14.3 days, the cooling temperatures make it a popular month for outdoor activities. After enduring the summer's intense heat, Waco's population appreciates the cooler canopies provided by September.

Temperature

September in Waco, Texas, is characterized by a mild reduction in the average high-temperature, from a sweltering 96.4°F (35.8°C) in August to a tropical 88.7°F (31.5°C). Nighttime temperature dips to a mean of 70.7°F (21.5°C) during September.

Heat index

The heat index in September is computed to be a fiery hot 98.6°F (37°C). Adopt heightened preventive measures, heat exhaustion and heat cramps are probable. Persistent activity could lead to heatstroke.
Heat index specifics point out values are for conditions of shade and a slight breeze. The heat index has the potential to rise by 15 Fahrenheit (8 Celsius) degrees with direct sunshine exposure.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', marries air temperature and humidity to produce a value illustrating perceived warmth. One's perception of weather can be shaped by other factors, involving metabolic differences, pregnancy, and physical exertion. It is essential to realize that direct sunlight can escalate the perceived temperature, increasing the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially vital to children. Children often miss understanding the importance of rest and rehydration. Thirst usually appears late during dehydration - therefore, maintaining hydration, particularly during long physical activities, is essential.
Sweat evaporation plays a crucial role in cooling the human body, a process enabled by perspiration. With an abundance of moisture present in the air, the process of evaporation becomes less effective, and the body fails to cool down as it should, leading to the sensation of overheating. Rising body temperatures resulting from an imbalance in heat absorption can lead to potential thermal issues.

Humidity

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

Rainfall

In Waco, in September, it is raining for 14.3 days, with typically 2.32" (59mm) of accumulated precipitation. Throughout the year, there are 133.5 rainfall days, and 26.65" (677mm) of precipitation is accumulated.

Snowfall

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

Daylight

The average length of the day in September in Waco is 12h and 21min.
On the first day of September, sunrise is at 7:04 am and sunset at 7:51 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 7:14 pm CDT.

Sunshine

The average sunshine in September is 8.5h.

UV index

In Waco, the average daily maximum UV index in September is 6. A UV Index reading of 6 to 7 represents a high health hazard from exposure to the Sun's UV radiation for average individuals.
Note: The maximum UV index of 6 during September translates into these guidelines:
Stick with precautions and abide by sun safety procedures. Evading sunburn is essential. 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. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense.
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Frequently asked questions

How hot does it get in Waco in September?

During September, Waco experiences an average high-temperature of 88.7°F (31.5°C) and a low-temperature of 70.7°F (21.5°C). In September, the average heat index (a.k.a. 'real feel', 'feels like'), which combines air temperature and relative humidity, is computed to be 98.6°F (37°C).

What is the average humidity in September in Waco?

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

How much does it rain in Waco in September?

In Waco, Texas, in September, during 14.3 rainfall days, 2.32" (59mm) of precipitation is typically accumulated.

When it does not snow in Waco?

In Waco, Texas, snow does not fall in March through December.

How many hours of daylight does Waco have in September?

The average day length in September in Waco is 12h and 21min.

When is the sunrise / sunset in September in Waco?

On the first day of September in Waco, Texas, sunrise is at 7:04 am and sunset at 7:51 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 7:14 pm CDT.

How long on average sun shines in September in Waco?

The average sunshine duration in September in Waco is 8.5h.

How high is the UV index in September in Waco?

In Waco, Texas, the average daily maximum UV index in September is 6. A UV Index reading of 6 to 7 represents a high health threat 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
Waco, TX

Average temperature in September - Waco, TX
  • Average high temperature in September: 88.7°F

The warmest month (with the highest average high temperature) is August (96.4°F).
The month with the lowest average high temperature is January (56.8°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 (40.5°F).

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Average pressure in September
Waco, TX

Average pressure in September - Waco, 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 (29.92"Hg).

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Average wind speed in September
Waco, TX

Average wind speed in September - Waco, TX
  • Average wind speed in September: 6.9mph

The windiest month (with the highest average wind speed) is March (10.5mph).
The calmest month (with the lowest average wind speed) is September (6.9mph).

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Average humidity in September
Waco, TX

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

The month with the highest relative humidity is May (76%).
The month with the lowest relative humidity is August (57%).

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Average rainfall in September
Waco, TX

Average rainfall in September - Waco, TX
  • Average rainfall in September: 2.32"

The wettest month (with the highest rainfall) is October (3.82").
The driest month (with the least rainfall) is November (1.42").

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Average rainfall days in September
Waco, TX

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

The month with the highest number of rainy days is May (14.5 days).
The month with the least rainy days is January (6.8 days).

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Average snowfall in September
Waco, TX

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

The month with the highest snowfall is February (0.39").
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
Waco, TX

Average snowfall days in September - Waco, 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
Waco, TX

Average daylight in September / Average sunshine in September - Waco, 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 6min).

  • 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 18min).

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Average sunshine days in September
Waco, TX

Average sunshine days in September - Waco, 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
Waco, TX

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

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

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Average cloud cover in September
Waco, TX

Average cloud cover in September - Waco, 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 22).

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Average visibility in September
Waco, TX

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

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