September weather forecast
Seffner, FL

The first month of the autumn, September, is still a tropical month in Seffner, Florida, with an average temperature ranging between min 74.8°F (23.8°C) and max 88.7°F (31.5°C).

Temperature

Seffner observes an average high-temperature of a still hot 88.7°F (31.5°C) in September, barely different from 90.3°F (32.4°C) in August. An average minimum temperature of 74.8°F (23.8°C) marks the month of September.

Heat index

September's heat index is appraised at a blistering 105.8°F (41°C). Take more safety measures, heat exhaustion and heat cramps are potential outcomes. Persistent activity might lead to heatstroke.
One should be cognizant that the heat index values are tailored for shaded spots and mild winds. Direct sunlight might lead to a heat index increase by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', embodies the combination of air temperature and moisture content to illustrate perceived heat. An individual's temperature experience can be influenced by extra factors, including metabolic differences, activity levels, and clothing. Remember, direct sunlight exposure can heighten the heat impact and might increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are primarily vital for children. Children often lack awareness of the importance of taking breaks and rehydrating. The feeling of thirst is a late indication of dehydration, so maintaining hydration, especially during long periods of physical activity, is critical.
The human body normally cools itself by perspiration, as evaporated sweat carries heat away from the body. An increase in relative humidity retards evaporation, subsequently reducing the body's heat removal rate and leading to a sensation of being overly warm. Excessive heat gain, when not shed effectively by the body, can result in increasing body temperatures and related hazards.

Humidity

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

Rainfall

In Seffner, 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 September, sunrise is at 7:08 am and sunset at 7:49 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 7:15 pm EDT.

Sunshine

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

UV index

The months with the highest UV index are May through September, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high health hazard from unsafe exposure to UV radiation for ordinary individuals.
Note: The daily high UV index of 7 during September translates into the following recommendations:
Use measures and accept sun safety conventions. Guarding against skin and eye trauma is of high priority. Avoid direct Sun exposure and stay in the shade between 10 a.m. and 4 p.m., a time when UV radiation is most intense, noting that not all shade structures offer full protection. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key.