September weather forecast
South Tampa, FL

The first month of the autumn, September, is still a hot month in South Tampa, Florida, with temperature in the range of an average low of 74.8°F (23.8°C) and an average high of 88.7°F (31.5°C).

Temperature

As South Tampa welcomes September, the average high-temperature records at a still tropical 88.7°F (31.5°C), marking an insignificant deviation from the prior month. Nighttime temperature in South Tampa experiences an average drop to a moderately hot 74.8°F (23.8°C) in September.

Heat index

September's mean heat index is estimated at a scorching 105.8°F (41°C). Use additional protective measures, heat cramps and heat exhaustion are possible outcomes. Continuous activity might lead to heatstroke.
Always consider that heat index estimations are for light winds and places in the shade. Heat index values can rise by 15 Fahrenheit (8 Celsius) degrees when in direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'real feel', is the outcome of merging air's temperature and its humidity metrics. One's perception of temperature is subjective, varying based on their activity and individual heat perception, influenced by factors like wind, clothing, and metabolic variations. It is noteworthy to mention that direct sunlight exposure can augment the felt temperature, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. Children usually face more risks than adults as their ability to sweat is less. Additionally, their larger skin surface in relation to their petite bodies and higher heat output due to their activities increases their vulnerability.
Perspiring is a crucial mechanism for the human body, allowing it to release excessive warmth through evaporating sweat. A surge in relative humidity can disrupt the body's normal cooling function by slowing evaporation, hence reducing the rate at which the body cools and intensifying the perception of heat. As body temperatures escalate without effective heat release, one might face dehydration threats.

Humidity

The months with the highest humidity in South Tampa, Florida, are August, September and December, with an average relative humidity of 76%.

Rainfall

In South Tampa, Florida, in September, it is raining for 19.6 days, with typically 1.65" (42mm) of accumulated precipitation. Throughout the year, there are 160.9 rainfall days, and 16.77" (426mm) of precipitation is accumulated.

Daylight

The average length of the day in September is 12h and 19min.
On the first day of the month, sunrise is at 7:09 am and sunset at 7:50 pm. On the last day of September, in South Tampa, sunrise is at 7:22 am and sunset at 7:16 pm EDT.

Sunshine

The average sunshine in September is 8.9h.

UV index

The months with the highest UV index in South Tampa are May through September, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV rays for the average person.
Note: A daily maximum UV index of 7 in September translates into the following instructions:
Inhibit overexposure. Warding off sun damage is of utmost importance. Stay in the shade and limit sun exposure from 10 a.m. to 4 p.m., when UV radiation is most potent. Keep in mind that shade structures like parasols or canopies do not offer full protection. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage.