September weather forecast
Fort Lauderdale, FL

September in Fort Lauderdale steps away from the usual trend, indicating a change as season transitions into fall. The average high and low temperatures take a slight dip compared to August. Rainfall continues to stay high but begins to slow down, moving towards the drier part of the year. This month features marginally shorter days of sunlight, with a decreased daylight duration. Not regular for this season is an increase in wind speed to 8.3mph (13.4km/h).

Temperature

The arrival of September sees an average high-temperature of a warm 85.8°F (29.9°C), hardly diverging from August's 87.4°F (30.8°C). Fort Lauderdale's temperature during September nights registers a minor decrease to an average low of 80.8°F (27.1°C).

Heat index

Throughout September, the heat index is evaluated at a very hot 96.8°F (36°C). Special measures are necessary to avoid heat cramps and heat exhaustion. Persistent activity could result in heatstroke.
In terms of the heat index, values are set with light wind and shade conditions in mind. Heat index values may surge by up to 15 Fahrenheit (8 Celsius) degrees in the presence of direct sunlight.
Note: The heat index, also known as 'real feel' or 'apparent temperature', integrates the air's temperature and its humidity to showcase the felt temperature by people. One's perception of temperature is subjective, varying based on their activity and individual heat perception, influenced by factors like wind, clothing, and metabolic variations. Direct sunlight can potentially raise the heat index by 15 Fahrenheit (8 Celsius) degrees, so it's crucial to consider. Heat index values are particularly relevant to children. Young ones often ignore the need to take a break and drink fluids. Thirst is a late-stage symptom of dehydration - hence, maintaining hydration, particularly during extended physical activities, is crucial.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. 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. Elevated heat gain compared to the body's release capability poses risks of dehydration and potential overheating.

Humidity

In September, the average relative humidity is 73%.

Rainfall

In Fort Lauderdale, in September, during 23.6 rainfall days, 1.73" (44mm) of precipitation is typically accumulated. Throughout the year, in Fort Lauderdale, there are 179 rainfall days, and 15.55" (395mm) of precipitation is accumulated.

Ocean temperature

In Fort Lauderdale, in September, the average water temperature is 85.1°F (29.5°C).
Note: Surface water temperatures ranging from 77°F (25°C) to 84.2°F (29°C) are considered superb and highly pleasant for water activities over extended periods.

Daylight

In September, the average length of the day is 12h and 18min.
On the first day of the month, sunrise is at 7:00 am and sunset at 7:39 pm. On the last day of September, sunrise is at 7:12 am and sunset at 7:07 pm EDT.

Sunshine

In Fort Lauderdale, Florida, the average sunshine in September is 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 value of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV radiation for average individuals.
Note: The maximum UV index, 7 during September, leads to the following recommendations:
Continue precautions and advocate sun safety advice. Deterrence of sunburn is indispensable. Avoid direct sunlight between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Keep in mind that shade structures may not provide complete protection. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key. Be wary! Reflections from sand and water make UV radiation more intense.