Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
September heralds a minor drop in average high-temperature, sliding from August's fiery hot 96.3°F (35.7°C) to a tropical 87.8°F (31°C). Flower Mound's average low-temperature in the month of September is recorded at a pleasant 70.3°F (21.3°C).Heat index
For September, the heat index is appraised at a sweltering 95°F (35°C). Implement more safety precautions, heat cramps and heat exhaustion may happen. Persistent activity could induce heatstroke.In terms of the heat index, values are set with light wind and shade conditions in mind. Direct sunlight exposure may result in a rise of the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', unifies temperature and humidity readings to offer a comprehensive feel of warmth. The experience of temperature can be subjective, varying based on the individual's activity and heat perception, influenced by factors like wind, attire, and metabolic variations. When you're directly under the sun's rays, remember that the heat index may surge by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to babies and toddlers. Kids are usually in more danger than grown-ups as they tend to sweat less. Plus, their bigger skin surface in relation to their small frames and increased heat generation due to their activity level make them more susceptible.
Evaporating sweat, an outcome of perspiration, is key in assisting the human body to moderate its temperature. 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. Rising body temperatures resulting from an imbalance in heat absorption can lead to potential thermal issues.
Humidity
In Flower Mound, the average relative humidity in September is 62%.Rainfall
In Flower Mound, during September, the rain falls for 12.8 days and regularly aggregates up to 2.09" (53mm) of precipitation. Throughout the year, there are 123.4 rainfall days, and 24.45" (621mm) of precipitation is accumulated.Snowfall
In Flower Mound, snow does not fall in April through November.Daylight
In September, the average length of the day is 12h and 22min.On the first day of September, sunrise is at 7:03 am and sunset at 7:52 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 7:13 pm CDT.
Sunshine
The average sunshine in September is 8.4h.UV index
In September, the average daily maximum UV index is 6. A UV Index reading of 6 to 7 represents a high threat to health from unsafe exposure to UV radiation for the ordinary person.Note: The daily maximum UV index of 6 in September interprets into the following advice:
Persist with precautions and heed sun safety advice. Prevention of sunburn is compulsory. From 10 a.m. to 4 p.m., when UV radiation is at its strongest, limit direct exposure to the Sun and note that shade structures may not provide full sun protection. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is it in September?
What is the average humidity in September?
How much does it rain in September?
When it does not snow?
How many hours of daylight does Flower Mound have in September?
When are sunrise and sunset in September?
How long on average sun shines in September?
What is the UV index reading in September?
Average temperature in September
Flower Mound, 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 (54.5°F).
- Average low temperature in September: 70.3°F
The 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 (38.8°F).
Average pressure in September
Flower Mound, 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 (29.9"Hg).
Average wind speed in September
Flower Mound, TX
- Average wind speed in September: 6.8mph
The windiest month (with the highest average wind speed) is April (10.2mph).
The calmest month (with the lowest average wind speed) is September (6.8mph).
Average humidity in September
Flower Mound, TX
- Average humidity in September: 62%
The month with the highest relative humidity is May (71%).
The month with the lowest relative humidity is August (54%).
Average rainfall in September
Flower Mound, TX
- Average rainfall in September: 2.09"
The wettest month (with the highest rainfall) is May (3.5").
The driest month (with the least rainfall) is January (1.1").
Average rainfall days in September
Flower Mound, TX
- Average rainfall days in September: 12.8 days
The month with the highest number of rainy days is May (14.8 days).
The month with the least rainy days is January (5.6 days).
Average snowfall in September
Flower Mound, TX
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.35").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").
Average snowfall days in September
Flower Mound, TX
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (0.8 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Flower Mound, 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 2min
The month with the most sunshine is July (Average sunshine: 11h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 42min).
Average sunshine days in September
Flower Mound, TX
- Average sunshine days in September: 15.4 days
The month with the most sunshine days is January (24.6 days).
The month with the least sunshine days is May (13.8 days).
Average UV index in September
Flower Mound, TX
- Average UV index in September: 6
The months with the highest UV index are May, June, July and August (UV index 7).
The months with the lowest UV index are January and December (UV index 3).
Average cloud cover in September
Flower Mound, TX
- Average cloud cover in September: 29
The month with the most cloud cover is March (Cloud cover 40).
The month with the least cloud cover is August (Cloud cover 20).
Average visibility in September
Flower Mound, 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).
Flower Mound, Texas, USA
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