September weather forecast
Tampa, FL

Tampa, Florida, begins to cool down in September, marking the transition from summer to fall. The number of daylight hours decreases marginally, and the city sees a decline in rainfall frequency. The thunderstorms become less intense and the humidity gradually starts to diminish. Despite this trend, the sea temperature still remains high at 84.4°F (29.1°C), the highest in the year. The easing weather conditions encourage a revival of outdoor activities towards the end of the month.

Temperature

The commencement of September in Tampa brings an average high-temperature of a still tropical 88.7°F (31.5°C), marking an inconsequential divergence from August. An average low-temperature of 76.1°F (24.5°C) is recorded during the nights in September in Tampa.

Heat index

The heat index for September is estimated at a scorching 104°F (40°C). Take additional safety steps, risk of heat exhaustion and heat cramps is notable. Prolonged activity may cause heatstroke.
Always consider that heat index estimations are for light winds and places in the shade. Exposing to direct sunshine may enhance heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', combines both the air temperature and the humidity level to give a perceived human temperature. The individual's temperature perception can be influenced by numerous factors such as metabolic variations, physical activity, and clothing. Keep aware, the sun, when shining directly, can intensify the heat experience, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. Children often fail to recognize the requirement to rest and rehydrate. Thirst, being a late symptom of dehydration, underlines the importance of maintaining hydration, especially during ongoing physical activities.
By perspiring, the human body can shed its excessive warmth since evaporated sweat cools it off. Under conditions of increased relative humidity, the evaporation rate lessens, causing the body to retain more heat than under less humid conditions. Accumulating heat beyond the body's cooling measures leads to rising temperatures and potential ailments.

Humidity

In September, the average relative humidity is 74%.

Rainfall

In Tampa, during September, the rain falls for 21.2 days and regularly aggregates up to 3.9" (99mm) of precipitation. 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 September, the average ocean temperature in Tampa is 84.4°F (29.1°C).
Note: Between 77°F (25°C) and 84.2°F (29°C), water temperature is typically considered very warm and pleasurable by everyone. Water activities at these temperatures are enjoyable for extended periods without discomfort.

Daylight

The average length of the day in September is 12h and 19min.
On the first day of the month, sunrise is at 7:08 am and sunset at 7:50 pm. On the last day of September, sunrise is at 7:22 am and sunset at 7:16 pm EDT.

Sunshine

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 unsafe exposure to UV radiation for the average person.
Note: The UV index of 7 in September translates into these instructions:
Skirt overexposure. People with light complexions might get scorched in under 20 minutes. Limit direct sun exposure and seek shade between 10 a.m. and 4 p.m., the time of the most intense UV radiation, noting that shade structures may not provide total sun protection. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays. Warning! The reflection of sand and water increases the UV dose.