September weather forecast
Seffner, FL

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

Temperature

In the transition from August to September, Seffner reports an average high-temperature of a still tropical 88.7°F (31.5°C), indicating a close resemblance to the prior month. In September, the recorded average low-temperature in Seffner is a warm 74.8°F (23.8°C).

Heat index

The heat index value for September is estimated at a blisteringly hot 105.8°F (41°C). Implement additional cautionary measures, heat cramps and heat exhaustion could occur. Prolonged activity might induce heatstroke.
Given the heat index, its values are aligned with shaded sites and gentle winds. Direct sunshine exposure could raise heat index values by as much as 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', ties air temperature with relative humidity to produce the perceived temperature sensation. The influence of weather is personal, with a diverse population experiencing it differently due to differences in body mass, stature, and degree of activity. It is essential to realize that direct sunlight can escalate the perceived temperature, increasing the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for children. Children often do not understand the need to rest and hydrate. Thirst is a late manifestation of dehydration - therefore, it is essential to stay hydrated, particularly during prolonged physical activities.
When it comes to cooling down, the human body's primary method is through perspiration, making use of sweat evaporation to eliminate excess heat. With an abundance of moisture present in the air, the process of evaporation becomes less effective, and the body fails to cool down as it should, leading to the sensation of overheating. 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

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

Rainfall

In Seffner, Florida, during September, the rain falls for 19.6 days and regularly aggregates up to 1.65" (42mm) of precipitation. In Seffner, Florida, during the entire year, the rain falls for 160.9 days and collects up to 16.77" (426mm) of precipitation.

Daylight

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

Sunshine

The average sunshine in September in Seffner 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 unprotected exposure to Sun's UV rays for average individuals.
Note: The daily high UV index of 7 during September translates into the following recommendations:
Persist with precautions and heed sun safety advice. Prevention of sunburn is compulsory. The Sun's UV radiation is most intense from 10 a.m. to 4 p.m. Try to avoid direct sun exposure during these hours. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly.