September weather forecast and climate
Frisco, TX

Weather in September

The first month of the autumn, September, is still a tropical month in Frisco, Texas, with temperature in the range of an average high of 87.6°F (30.9°C) and an average low of 70.2°F (21.2°C).

Temperature

In Frisco, Texas, the average high-temperature slightly decreases, from a torrid 95.9°F (35.5°C) in August, to a tropical 87.6°F (30.9°C). In September, in Frisco, the average low-temperature is 70.2°F (21.2°C).

Heat index

The average heat index is calculated to be a torrid 95.2°F (35.1°C). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'real feel', 'felt air temperature', or 'feels like', is a measure of how hot it feels when the actual air humidity is factored in. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (wind, metabolic differences, clothing). Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. 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 is 62%.

Rainfall

In September, the rain falls for 13.9 days. Throughout September, 2.52" (64mm) of precipitation is accumulated. Throughout the year, there are 135 rainfall days, and 29.65" (753mm) of precipitation is accumulated.

Snowfall

April through October are months without snowfall.

Daylight

In September, the average length of the day is 12.4h.

Sunshine

In Frisco, Texas, the average sunshine is 8.5h.

UV index

In September, the average daily maximum UV index in Frisco is 6. A UV Index estimate of 6 to 7 represents a high health risk from the exposure to the Sun's UV radiation for average individuals.
Note: The average daily UV index of 6 in September transform into the following instructions:
Take precautions against overexposure. Protection against sun damage is needed. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. 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 Frisco?

In Frisco, Texas, in September, the average high-temperature is 87.6°F (30.9°C), and the average low-temperature is 70.2°F (21.2°C). The average heat index (a.k.a. 'feels like', 'felt air temperature'), which combines relative humidity and air temperature, in September is calculated to be 95.2°F (35.1°C).

What is the average humidity in September in Frisco?

In September, the average relative humidity is 62%.

How many days does it rain in September in Frisco?

In Frisco, Texas, in September, during 13.9 rainfall days, 2.52" (64mm) of precipitation is typically accumulated.

When it does not snow in Frisco?

April through October are months without snowfall in Frisco, Texas.

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

In Frisco, the average length of the day in September is 12.4h.

How long on average sun shines in September in Frisco?

The average sunshine in September in Frisco is 8.5h.

How high is the UV index in September in Frisco?

In Frisco, 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 unsafe exposure to the Sun's UV rays.

Average temperature in September
Frisco, TX

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

The warmest month (with the highest average high temperature) is August (95.9°F).
The month with the lowest average high temperature is January (54°F).

  • Average low temperature in September: 70.2°F

Months with the highest average low temperature are July and August (76.6°F).
The coldest month (with the lowest average low temperature) is January (38.5°F).

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Average pressure in September
Frisco, TX

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

The month with the highest atmospheric pressure is January (30.16").
The month with the lowest atmospheric pressure is June (29.9").

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Average wind speed in September
Frisco, TX

Average wind speed in September - Frisco, TX
  • Average wind speed in September: 6.8mph

The windiest months (with the highest average wind speed) are March and April (10.1mph).
The calmest month (with the lowest average wind speed) is September (6.8mph).

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Average humidity in September
Frisco, TX

Average humidity in September - Frisco, TX
  • Average humidity in September: 62%

The month with the highest relative humidity is May (72%).
The month with the lowest relative humidity is August (55%).

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Average rainfall in September
Frisco, TX

Average rainfall in September - Frisco, TX
  • Average rainfall in September: 2.52"

The wettest month (with the highest rainfall) is October (3.82").
The driest month (with the least rainfall) is February (1.57").

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Average rainfall days in September
Frisco, TX

Average rainfall days in September - Frisco, TX
  • Average rainfall days in September: 13.9 days

The month with the highest number of rainy days is May (14.8 days).
The month with the least rainy days is January (6.6 days).

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Average snowfall in September
Frisco, TX

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

The month with the highest snowfall is February (0.71").
Months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in September
Frisco, TX

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

The month with the highest number of snowfall days is February (1.1 days).
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
Frisco, TX

Average daylight in September / Average sunshine in September - Frisco, TX
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.3h).
The month with the shortest days is December (Average daylight: 10h).

  • Average sunshine in September: 8.5h

The month with the most sunshine is August (Average sunshine: 11.1h).
The month with the least sunshine is December (Average sunshine: 5.7h).

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Average sunshine days in September
Frisco, TX

Average sunshine days in September - Frisco, TX
  • Average sunshine days in September: 14.7 days

The month with the most sunshine days is January (22.9 days).
The month with the least sunshine days is May (13.9 days).

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Average UV index in September
Frisco, TX

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

Months with the highest UV index are May, 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
Frisco, TX

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

The month with the most cloud cover is March (Cloud cover 40).
The month with the least cloud cover is August (Cloud cover 19).

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Average visibility in September
Frisco, TX

Average visibility in September - Frisco, TX
  • Average visibility in September: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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