September weather forecast
Lisbon, FL

September, the first month of the autumn in Lisbon, is also a hot month, with an average temperature ranging between max 88.2°F (31.2°C) and min 73.2°F (22.9°C).

Temperature

September registers an average high-temperature of a still tropical 88.2°F (31.2°C), slightly varied from August's 90.7°F (32.6°C). In September, the nighttime temperature in Lisbon lowers to an average of 73.2°F (22.9°C).

Heat index

September's mean heat index is estimated at a scorching 105.8°F (41°C). Exercise more precautions, heat cramps and heat exhaustion are potential risks. Continuous activity could precipitate heatstroke.
Note that heat index values are valued for light wind and location in the shade. 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' or 'feels like', quantifies the warmth felt when relative humidity is considered. An individual's perception of weather can be influenced by a variety of factors including metabolic differences, being pregnant, and their degree of physical exertion. Keep it in mind, direct sunlight can augment the heat you experience, possibly pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to children. Children frequently underestimate the necessity to rest and hydrate. Thirst is a late sign of dehydration - thus, it is vital to stay hydrated, particularly during lengthy physical exercises.
The human body keeps its cool primarily through perspiration, as this process enables sweat to evaporate, taking away the excess heat. In the presence of abundant moisture in the atmosphere, the cooling process through evaporation is hindered, causing the body to feel excessively warm. Heat absorption that surpasses the body's shedding capability can lead to overheating and varying levels of dehydration.

Humidity

The months with the highest humidity in Lisbon are July through September, with an average relative humidity of 78%.

Rainfall

In September, in Lisbon, the rain falls for 23.5 days. Throughout September, 4.09" (104mm) of precipitation is accumulated. In Lisbon, during the entire year, the rain falls for 200.1 days and collects up to 39.06" (992mm) of precipitation.

Daylight

In Lisbon, Florida, the average length of the day in September is 12h and 19min.
On the first day of September, sunrise is at 7:05 am and sunset at 7:48 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 7:13 pm EDT.

Sunshine

In September, the average sunshine is 8.8h.

UV index

In Lisbon, the average daily maximum UV index in September is 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation for ordinary individuals.
Note: The UV index of 6 during September leads to these advisories:
Undertake precautions and comply with sun safety standards. Protection from skin and eye injury is vital. Stay in the shade and limit direct sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its strongest. Remember, however, that not all shade structures provide full sun protection. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation.