September weather forecast
Orlando, FL

The weather in September begins to hint towards the end of summer while the city remains drenched in high warmth, with temperatures ranging between 74.5°F (23.6°C) to 88.5°F (31.4°C). Humidity levels remain high, yet slightly drier than the preceding summer months. The duration of daylight shrinks further to 12.3 hours, indicating the impending fall. An extended ten-day reduction in sunshine compared to August intimates the transition towards the cooler half of the year. The UV index tends to descend back to 7, prompting lesser severity of sun protection.

Temperature

The weather during September records an average high-temperature of a still hot 88.5°F (31.4°C), closely mirroring the preceding month. Orlando, in September, observes a steady average low-temperature of 74.5°F (23.6°C).

Heat index

In September, the heat index is estimated at an extremely hot 105.8°F (41°C). Exercise enhanced safety steps, heat cramps and heat exhaustion are probable. Heatstroke could be a result of sustained activity.
Heat index specifics point out values are for conditions of shade and a slight breeze. The direct sun can potentially cause the heat index to increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', is an amalgamation of air temperature and humidity to express the equivalent perceived temperature. 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. You should know that direct sun exposure can heighten weather effects, potentially elevating the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially vital to children. Typically, young kids are at a higher risk than adults since they sweat less. Also, the larger skin surface in proportion to their small bodies and the heightened heat production due to their active nature adds to their vulnerability.
The human body normally cools itself by perspiration, as evaporated sweat carries heat away from the body. Under high air temperature and humidity (high heat index) conditions, perspiration is limited, and the perception of heat is increased. Exceeding the body's heat disposal threshold results in a rise in body temperature and potential thermal disorders.

Humidity

The months with the highest humidity are August and September, with an average relative humidity of 77%.

Rainfall

In Orlando, during September, the rain falls for 21.4 days and regularly aggregates up to 3.94" (100mm) of precipitation. Throughout the year, there are 187.6 rainfall days, and 33.86" (860mm) of precipitation is accumulated.

Daylight

The average length of the day in September is 12h and 19min.
On the first day of the month, sunrise is at 7:04 am and sunset at 7:46 pm. On the last day of September, sunrise is at 7:18 am and sunset at 7:12 pm EDT.

Sunshine

In Orlando, the average sunshine in September is 8.7h.

UV index

May through September, with an average maximum UV index of 7, are months with the highest UV index in Orlando. A UV Index reading of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV rays for ordinary individuals.
Note: An average UV index of 7 in September transforms into this advice:
Persist with safeguards and heed sun safety doctrines. Keeping sunburn at bay is of prime importance. Remember that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. Make an effort to avoid direct sun exposure during these hours. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses.