September weather forecast
Shelbyville, TX

September, the first month of the autumn in Shelbyville, is still a tropical month, with an average temperature fluctuating between 67.6°F (19.8°C) and 88.9°F (31.6°C).

Temperature

With the arrival of September, Shelbyville notices a mild change in the average high-temperature, sliding from August's fiery hot 95°F (35°C) to a hot 88.9°F (31.6°C). In the month of September, the average low-temperature in Shelbyville usually rests at a refreshing 67.6°F (19.8°C).

Heat index

The average heat index in September is appraised at a scorching 104°F (40°C). Extra precautions are necessary, heat cramps and heat exhaustion are plausible outcomes. Extended activity could lead to heatstroke.
Research indicates the heat index considers values in shaded locales and with light 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 'apparent temperature', determines the feeling of heat when you account for the relative humidity. One's perception of temperature can vary depending on physical activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. Consider the sun's direct rays and their impact; they can potentially increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely vital to babies and toddlers. In general, children are more at risk than adults because they sweat less. Furthermore, the large skin surface compared to their small bodies and the high heat production due to their actions contribute to this vulnerability.
To achieve cooling, the human body employs perspiration, relying on the subsequent evaporation of sweat. When the level of relative humidity is elevated, evaporation diminishes, causing more warmth to be retained in the body than in dry air. If heat absorption isn't effectively countered by the body's cooling methods, body temperature surges, hinting at potential problems.

Humidity

In September, the average relative humidity is 72%.

Rainfall

In Shelbyville, in September, during 15 rainfall days, 2.83" (72mm) of precipitation is typically accumulated. Throughout the year, there are 160.4 rainfall days, and 35.83" (910mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Shelbyville are January through March, September and December. September is the first month it typically snows in Shelbyville. Throughout September, in the average 0.1 snowfall days, it receives 0.04" (1mm) of snow. In Shelbyville, Texas, during the entire year, snow falls for 2.6 days and aggregates up to 0.79" (20mm) of snow.

Daylight

The average length of the day in September is 12h and 21min.
On the first day of September, sunrise is at 6:52 am and sunset at 7:39 pm. On the last day of the month, sunrise is at 7:09 am and sunset at 7:02 pm CDT.

Sunshine

The average sunshine in September in Shelbyville is 9.1h.

UV index

The average daily maximum UV index in September in Shelbyville is 6. A UV Index of 6 to 7 symbolizes a high health hazard from exposure to the Sun's UV radiation for average individuals.
Note: In September, the maximum UV index of 6 transforms into these recommendations:
Ward off overexposure. Defence against solar harm is crucial. Avoid direct Sun exposure and seek shade between 10 a.m. and 4 p.m., when UV radiation is at its peak, but keep in mind that not all shade structures provide complete protection. Boost your sun resistance with garments that are densely woven yet spacious. Be cautious! The UV radiation from the Sun can be magnified almost twofold by snow reflection.