September weather forecast
Lisbon, FL

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

Temperature

Lisbon experiences a recorded average high-temperature of a still hot 88.2°F (31.2°C) in September, closely aligned with August's 90.7°F (32.6°C). Throughout the month of September, Lisbon sees a steady low-temperature average of 73.2°F (22.9°C).

Heat index

The heat index value for September is appraised at a scorching 105.8°F (41°C). Take more safety measures, heat exhaustion and heat cramps are potential outcomes. Persistent activity might lead to heatstroke.
It is noted that heat index values are ascertained for locations in the shade and with gentle breezes. With exposure to direct sunshine, the heat index could climb by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'apparent temperature', quantifies the warmth felt when relative humidity is considered. This effect is subjective, differing among individuals based on their physical activity and perception of heat, which can be influenced by factors like wind, clothing, and metabolic variances. Given the impact of direct sunlight, it's noteworthy that the felt temperature can rise by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for children. Young individuals are generally in more danger than adults due to their lower capacity to sweat. Moreover, their large skin surface in relation to their small bodies and the increased heat generation from their activities makes them more vulnerable.
The body's innate mechanism to counteract overheating is through perspiration, as it leverages the cooling effects of sweat evaporation. An increase in relative humidity disrupts body cooling by slowing the evaporation rate, thereby reducing the rate at which the body cools and amplifying the sense of heat. With body temperatures on the rise, inefficient heat shedding can lead to dehydration and its associated complications.

Humidity

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

Rainfall

In Lisbon, during September, the rain falls for 23.5 days and regularly aggregates up to 4.09" (104mm) of precipitation. Throughout the year, there are 200.1 rainfall days, and 39.06" (992mm) 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 7:05 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

The average sunshine in September is 8.8h.

UV index

The average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high threat to health from unsafe exposure to UV radiation for the average person.
Note: The UV index of 6 during September leads to these advisories:
Conform to measures and uphold sun safety traditions. Warding off skin and eye harm is necessary. UV radiation from the Sun is most intense between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage.