September weather forecast
Sewall's Point, FL

September, the first month of the autumn in Sewall's Point, is also a moderately hot month, with temperature in the range of an average low of 78.3°F (25.7°C) and an average high of 85.3°F (29.6°C).

Temperature

Transitioning into September, Sewall's Point records an average high-temperature of a moderately hot 85.3°F (29.6°C), almost identical to August's 87.1°F (30.6°C). Sewall's Point encounters an average temperature dip to 78.3°F (25.7°C) throughout September, subtly lower than its daytime maximum.

Heat index

Throughout September, the heat index is estimated at a torrid 96.8°F (36°C). Implement additional safety measures to avoid heat cramps and heat exhaustion. Persistent activity might trigger heatstroke.
Heat index data is primarily for areas with shade and subjected to light winds. A rise in the heat index by 15 Fahrenheit (8 Celsius) degrees may result from direct sunlight exposure.
Note: The heat index, also known as 'apparent temperature' or 'real feel', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. This impact is subjective, influenced by the person's physical activity and individual heat perception, affected by factors including wind, attire, and metabolic differences. Should you be directly under the sun, anticipate a possible increase in the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to children. Children usually face more risks than adults as their ability to sweat is less. Additionally, their larger skin surface in relation to their petite bodies and higher heat output due to their activities increases their vulnerability.
When faced with excessive heat, the human body begins to perspire, utilizing the cooling benefits of sweat evaporation. Elevated relative humidity diminishes evaporation, thereby reducing the body's ability to shed heat and creating a feeling of being too warm. When the heat gained surpasses the body's cooling capacity, temperatures rise, signaling potential health concerns.

Humidity

In September, the average relative humidity is 77%.

Rainfall

In Sewall's Point, in September, during 22.6 rainfall days, 1.5" (38mm) of precipitation is typically accumulated. Throughout the year, there are 168.1 rainfall days, and 14.09" (358mm) of precipitation is accumulated.

Ocean temperature

In Sewall's Point, the average seawater temperature in September is 84.4°F (29.1°C).
Note: Engaging in water activities, such as swimming or diving, in temperatures from 77°F (25°C) to 84.2°F (29°C) is very pleasurable for extended periods, without any discomfort.

Daylight

In Sewall's Point, the average length of the day in September is 12h and 19min.
On the first day of the month, sunrise is at 7:00 am and sunset at 7:40 pm. On the last day of September, sunrise is at 7:13 am and sunset at 7:07 pm EDT.

Sunshine

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 reading of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV rays for average individuals.
Note: The UV index of 7 in September translates into these instructions:
Uphold preventive measures and conform to sun safety guidelines. Defending against skin and eye harm is crucial. Between 10 a.m. and 4 p.m., the Sun emits the most powerful UV radiation. Limit direct exposure to the Sun during these hours. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly. Alert! Sand and water increase UV exposure due to their reflective properties.