September weather forecast
Longwood, FL

The first month of the autumn, September, is still a tropical month in Longwood, Florida, with an average temperature ranging between min 74.3°F (23.5°C) and max 88.5°F (31.4°C).

Temperature

September's advent presents an average high-temperature of a still tropical 88.5°F (31.4°C), indicating a slight variation from the conditions of the previous month. The temperature lowers to an average of 74.3°F (23.5°C) during September nights.

Heat index

Throughout September, the heat index is estimated at a scorching 105.8°F (41°C). Take greater precautions, heat exhaustion and heat cramps may be expected. Heatstroke could result from lengthy activity.
One should consider that heat index numbers are for shaded settings and light wind. The presence of direct sunlight can raise the heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'feels like', is a calculation that merges air temperature and relative humidity to depict the sensation of warmth. Elements such as metabolic variations, being pregnant, and physical activity can impact one's weather perception. It is essential to be conscious of the fact that direct sunlight can intensify the felt heat, leading to an elevation in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for children. Young kids are often more at risk than adults as they tend to perspire less. Besides, their skin surface is larger relative to their small bodies, and their increased heat output from their active lifestyle compounds their risk.
In response to overheating, the human body perspires to cool down, mainly through the evaporation of sweat. When relative humidity increases, the body's capacity to evaporate heat decreases, leading to a heightened sense of warmth. If the body retains more heat than it can expel, the increasing temperature can lead to heat-related conditions.

Humidity

September is the most humid month, with an average relative humidity of 77%.

Rainfall

In September, the rain falls for 19.7 days. Throughout September, 2.48" (63mm) of precipitation is accumulated. Throughout the year, in Longwood, there are 172.9 rainfall days, and 22.76" (578mm) of precipitation is accumulated.

Daylight

The average length of the day in September in Longwood, Florida, is 12h and 19min.
On the first day of the month, sunrise is at 7:03 am and sunset at 7:46 pm. On the last day of September, sunrise is at 7:18 am and sunset at 7:11 pm EDT.

Sunshine

In September, the average sunshine in Longwood is 8.8h.

UV index

May through September, with an average maximum UV index of 7, are months with the highest UV index in Longwood. A UV Index of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV rays for the ordinary person.
Note: The UV index of 7 in September translates into these instructions:
Refrain from overexposure. Fair-skinned individuals could burn in under 20 minutes. 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. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses.