September weather forecast
Saint James City, FL

September, the first month of the autumn in Saint James City, is still a tropical month, with an average temperature varying between 86.7°F (30.4°C) and 79°F (26.1°C).

Temperature

September's commencement is accompanied by an average high-temperature of a still hot 86.7°F (30.4°C), diverging marginally from August's 88°F (31.1°C). Saint James City's nighttime temperature in September shows a minor descent, with a steady average of 79°F (26.1°C).

Heat index

During September, the heat index is calculated to be a very hot 98.6°F (37°C). Extra precautions are necessary, heat cramps and heat exhaustion are plausible outcomes. Extended activity could lead to heatstroke.
It is worth noting that heat index values are gauged for conditions in the shade and light breezes. Direct sunlight might cause an increase of up to 15 Fahrenheit (8 Celsius) degrees in the heat index.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', ties air temperature with relative humidity to produce the perceived temperature sensation. Additional elements including metabolic differences, the level of physical activity, and attire have a role in shaping the individual's temperature perception. One must note that being under the direct sun can escalate the heat's effects, with the heat index possibly rising by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to children. Kids frequently fail to realize the necessity for resting and hydrating. Thirst is an advanced indication of dehydration - hence, maintaining hydration, especially during extended physical activities, becomes essential.
Sweat evaporation, driven by perspiration, is the method the human body uses to rid itself of excessive warmth. In situations of high air temperature combined with high humidity (significant heat index), the body's ability to perspire is reduced, heightening the sense of warmth. When the body is unable to balance heat gain, its temperature elevates, which may induce thermal illnesses.

Humidity

The average relative humidity in September in Saint James City is 75%.

Rainfall

In Saint James City, during September, the rain falls for 19.5 days and regularly aggregates up to 1.02" (26mm) of precipitation. In Saint James City, during the entire year, the rain falls for 122 days and collects up to 8.98" (228mm) of precipitation.

Ocean temperature

In Saint James City, in September, the average water temperature is 85.3°F (29.6°C).
Note: For swimming, diving, and similar activities, the water temperatures between 77°F (25°C) and 84.2°F (29°C) are considered delightful, allowing for extended periods of enjoyment without discomfort.

Daylight

The average length of the day in September in Saint James City, Florida, is 12h and 18min.
On the first day of September in Saint James City, sunrise is at 7:08 am and sunset at 7:47 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 7:15 pm EDT.

Sunshine

In September, the average sunshine is 9.1h.

UV index

The months with the highest UV index are May through September, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV rays for average individuals.
Note: A typical high UV index of 7 in September suggests the following recommendations:
Persist in precautions and follow sun safety policies. Keeping sunburn at bay is imperative. Stay in the shade and limit direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is particularly strong. Remember, however, that shade structures may not provide complete protection. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. Caution! The mirror effect of sand and water ups the UV radiation strength.