September weather forecast
League City, TX

September signifies the beginning of autumn in League City, with temperatures dropping to span from 75.7°F (24.3°C) to 86.2°F (30.1°C). September witnesses the highest rainfall of the year, mapping at 1.5" (38mm). Despite the rainfall, the decrease in temperature and humidity along with prolonged daylight hours offer perfect conditions for outdoor events and picnics. As September advances, the cool autumn evenings add a certain charm to the city’s lively atmosphere. The gradual shift from the sweltering heat of summer to the pleasant coolness of autumn makes September a delightful month.

Temperature

With the start of September, League City measures an average high-temperature of a still hot 86.2°F (30.1°C), not significantly differing from August's 90.5°F (32.5°C). League City, in September, witnesses an average low-temperature of 75.7°F (24.3°C).

Heat index

The heat index for September is evaluated at a very hot 98.6°F (37°C). Implement more safety precautions, heat cramps and heat exhaustion may happen. Persistent activity could induce heatstroke.
Heat index readings emphasize conditions of light breezes and shaded spots. Facing direct sunlight may hike up the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', reflects the blend of air temperature and relative humidity to give a temperature impression. The impact of weather is individual, with diverse individuals experiencing it differently due to variations in body mass, height, and activity levels. With the sun shining directly, it's crucial to understand that it can increase the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are essentially critical for children. Youngsters frequently overlook the need for breaks and fluid intake. Thirst is an advanced sign of dehydration - thereby highlighting the importance of keeping hydrated, particularly during long physical activities.
In the face of high temperatures, the human body's reflex is to perspire, leveraging sweat evaporation for cooling. An elevated level of relative humidity hinders evaporation, leading to decreased heat elimination from the body, inducing a sensation of excess heat. When heat uptake goes beyond the body's cooling mechanisms, there's a surge in body temperature, posing health risks.

Humidity

In League City, Texas, the average relative humidity in September is 75%.

Rainfall

September is the month with the most rainfall in League City. Rain falls for 15.9 days and accumulates 1.5" (38mm) of precipitation.

Snowfall

Months with snowfall are January, September and December. The months with the most snowfall days are January, September and December, with an average of 0.1 snowfall days.

Daylight

In September, the average length of the day is 12h and 20min.
On the first day of the month, sunrise is at 6:58 am and sunset at 7:42 pm. On the last day of September, in League City, sunrise is at 7:13 am and sunset at 7:06 pm CDT.

Sunshine

In September, the average sunshine is 8.6h.

UV index

In League City, the average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV rays for the ordinary person.
Note: A daily high UV index of 6 in September leads to these guidelines:
Evade overexposure. Individuals with fair skin risk burning in under 20 minutes. The Sun emits the most powerful UV radiation between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. 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. Be vigilant! The reflective nature of snow can increase the Sun's UV radiation nearly twofold.