September weather forecast
Tampa, FL

The first month of the autumn, September, is also a hot month in Tampa, Florida, with temperature in the range of an average high of 88.7°F (31.5°C) and an average low of 76.1°F (24.5°C).

Temperature

In Tampa, the average high-temperature in September is almost the same as in August - a still tropical 88.7°F (31.5°C). In September, the average low-temperature is 76.1°F (24.5°C).

Heat index

In September, the average heat index is appraised at a blistering 104°F (40°C). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'real feel', 'feels like', or 'felt air temperature', is a measure of how hot it feels when the actual air humidity is factored in. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (differences in body mass, height, and shape, clothing, metabolic differences). Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.
The human body normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. When the relative humidity is high, the evaporation rate is reduced. The warmth is removed from the body at a lower rate, causing the body to retain more heat than it would in dry air. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

In Tampa, the average relative humidity in September is 74%.

Rainfall

In September, in Tampa, the rain falls for 21.2 days. Throughout September, 3.9" (99mm) of precipitation is accumulated. In Tampa, during the entire year, the rain falls for 178.2 days and collects up to 32.87" (835mm) of precipitation.

Ocean temperature

In Tampa, in September, the average water temperature is 84.4°F (29.1°C).
Note: Water temperature between 77°F (25°C) and 84.2°F (29°C) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

Daylight

In Tampa, Florida, the average length of the day in September is 12h and 19min.
On the first day of September, sunrise is at 7:08 am and sunset at 7:51 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 7:17 pm EDT.

Sunshine

In Tampa, the average sunshine in September is 8.9h.

UV index

May through September, with an average maximum UV index of 7, are months with the highest UV index in Tampa. A UV Index reading of 6 to 7 represents a high threat to health from exposure to the Sun's UV radiation for ordinary individuals.
Note: In September, the average maximum UV index of 7 translate into the following recommendations:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. 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. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.