September weather forecast
Saint Simons Island, GA

September brings a slow transition from the hot summer temperatures to a more comfortable fall climate on Saint Simons Island. It places a halt on the sequence of increasing rainfall from the summer, causing a reverse. The visible shortening of days and more moderate heat levels differ drastically from the conditions experienced in August. The main highlight of September is its reduced average rainfall of 2.8" (71mm), a significant decrease from August's high. It also signifies the nearing end of the main tourist season, offering a more relaxed atmosphere for visitors who linger.

Temperature

The shift into September uncovers an average high-temperature of a moderately hot 84.9°F (29.4°C), subtly different from the previous month. Throughout September, the average low-temperature records at 74.3°F (23.5°C).

Heat index

September's heat index is calculated to be a torrid 95°F (35°C). Ensure heightened precautions, risk of heat cramps and heat exhaustion is significant. Sustained activity could provoke heatstroke.
Metrics for the heat index primarily focus on shaded spots and light wind conditions. When exposed to the direct sun, the heat index may augment by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. Elements of metabolic variation, physical activity, and clothing contribute to the effect of temperature on an individual. When exposed to direct sunlight, it's possible for the heat index to increase by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. Youngsters often neglect the necessity for rest and hydration. Thirst is a sign of advancing dehydration - thus the importance of maintaining hydration, specifically during long-lasting physical activities.
For the human body, perspiration is the go-to method to regulate temperature, using sweat's evaporation to dissipate warmth. An upsurge in relative humidity affects normal body cooling mechanisms by slowing evaporation, hence reducing the rate at which the body cools and intensifying the perception of heat. Overheating dangers loom when the body's heat release mechanisms are overshadowed by excessive gain.

Humidity

The average relative humidity in September in Saint Simons Island is 77%.

Rainfall

In September, the rain falls for 19.2 days. Throughout September, 2.8" (71mm) of precipitation is accumulated. Throughout the year, there are 163.3 rainfall days, and 20.43" (519mm) of precipitation is accumulated.

Snowfall

In Saint Simons Island, snow does not fall in January, March through November.

Ocean temperature

In Saint Simons Island, in September, the average water temperature is 82.4°F (28°C).
Note: Water temperature ranging from 77°F (25°C) to 84.2°F (29°C) is recognized as warm and pleasant by all, making water activities comfortable and delightful for long durations.

Daylight

In Saint Simons Island, Georgia, the average length of the day in September is 12h and 20min.
On the first day of September, sunrise is at 7:02 am and sunset at 7:48 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 7:11 pm EDT.

Sunshine

In Saint Simons Island, the average sunshine in September is 8.6h.

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 health hazard from unprotected exposure to Sun's UV rays for average individuals.
Note: The daily high UV index of 7 in September translates into this advice:
Undertake precautions and comply with sun safety standards. Protection from skin and eye injury is vital. From 10 a.m. to 4 p.m., when UV radiation is at its strongest, limit direct exposure to the Sun and note that shade structures may not provide full sun protection. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes. Warning! Sand and water reflections boost the intensity of UV exposure.