September weather forecast
Flynn, TX

September, the first month of the autumn in Flynn, is also a hot month, with an average temperature ranging between min 68.9°F (20.5°C) and max 88.7°F (31.5°C).

Temperature

In Flynn, entering September brings a subtle temperature decrement, reducing from August's fiery hot 95.9°F (35.5°C) to a tropical 88.7°F (31.5°C). An average low-temperature of 68.9°F (20.5°C) is expected in Flynn during September.

Heat index

During September, the heat index is estimated at a sweltering 102.2°F (39°C). Exercise enhanced safety steps, heat cramps and heat exhaustion are probable. Heatstroke could be a result of sustained activity.
Understand that the heat index values take into account shaded locations and mild winds. Heat index values may rise by up to 15 Fahrenheit (8 Celsius) degrees when exposed to direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'feels like', joins air temperature with relative humidity to produce a temperature perception for humans. The influence of weather is personal, differing among a variety of individuals based on differences in body mass, stature, and the level of physical activity. Remember, direct sunlight exposure can heighten the heat impact and might increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to children. Children often do not understand the need to rest and hydrate. Thirst is a late manifestation of dehydration - therefore, it is essential to stay hydrated, particularly during prolonged physical activities.
To cool down, the human body relies on perspiration, a process where excessive heat is eliminated as sweat evaporates. In the presence of elevated relative humidity, the evaporation rate decreases. This reduction leads to increased body heat retention compared to conditions of dry air. Heat absorption that surpasses the body's shedding capability can lead to overheating and varying levels of dehydration.

Humidity

In Flynn, the average relative humidity in September is 70%.

Rainfall

In Flynn, during September, the rain falls for 15.5 days and regularly aggregates up to 2.56" (65mm) of precipitation. Throughout the year, there are 149.4 rainfall days, and 30" (762mm) of precipitation is accumulated.

Snowfall

January, February and September are months with snowfall in Flynn. September is the first month it typically snows. Throughout September, in the average 0.1 snowfall days, it receives 0.04" (1mm) of snow. Throughout the year, in Flynn, there are 1.1 snowfall days, and 0.47" (12mm) of snow is accumulated.

Daylight

In September, the average length of the day in Flynn is 12h and 20min.
On the first day of the month, sunrise is at 7:01 am and sunset at 7:47 pm. On the last day of September, in Flynn, sunrise is at 7:18 am and sunset at 7:10 pm CDT.

Sunshine

In Flynn, the average sunshine in September is 8.4h.

UV index

The average daily maximum UV index in September in Flynn is 6. A UV Index reading of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 6 in September interprets into the following advice:
Resist overexposure. Safeguarding from solar damage is indispensable. 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. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays. Mark this! Snow reflection can nearly double the UV radiation intensity from the Sun.