Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
The beginning of September records an average high-temperature of a still warm 82.9°F (28.3°C), almost echoing the conditions of the previous month. During September, nights cool slightly to an average low of 74.3°F (23.5°C).Heat index
The heat index for September is appraised at a hot 89.6°F (32°C). If one continues to be active during exposure, it might cause tiredness and subsequent heat cramps.When considering the heat index, it's pivotal to note it is for shade and mild wind conditions. If exposed to direct sunlight, the heat index could climb by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', melds the effects of warmth and moisture to generate a feeling of heat. The impact of weather on an individual can be subjective, affected by the person's activity and heat perception, which can vary due to elements including wind, clothing, and metabolic differences. Keep aware, the sun, when shining directly, can intensify the heat experience, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children often fail to recognize the requirement to rest and rehydrate. Thirst, being a late symptom of dehydration, underlines the importance of maintaining hydration, especially during ongoing physical activities.
Humidity
In September, the average relative humidity in Sullivan's Island is 76%.Rainfall
In September, in Sullivan's Island, the rain falls for 19.2 days. Throughout September, 5.71" (145mm) of precipitation is accumulated. Throughout the year, in Sullivan's Island, there are 182 rainfall days, and 45.55" (1157mm) of precipitation is accumulated.Snowfall
In Sullivan's Island, South Carolina, snow does not fall in March through December.Daylight
In Sullivan's Island, the average length of the day in September is 12h and 22min.On the first day of the month, sunrise is at 6:54 am and sunset at 7:43 pm. On the last day of September, sunrise is at 7:13 am and sunset at 7:04 pm EDT.
Sunshine
In September, the average sunshine in Sullivan's Island is 9.2h.UV index
In September, the average daily maximum UV index is 6. A UV Index value of 6 to 7 symbolizes a high health hazard from unsafe exposure to UV radiation for ordinary individuals.Note: The average daily UV index of 6 in September transforms into the following instructions:
Steer clear of overexposure. Fair-skinned individuals can be scorched in less than 20 minutes. Limit your direct sun exposure, especially between 10 a.m. and 4 p.m., when UV radiation is strongest. Shade structures might not provide complete sun protection. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.
Frequently asked questions
Is it hot in Sullivan's Island during September?
What is the average humidity in September in Sullivan's Island?
How many days does it rain in September in Sullivan's Island?
When it does not snow in Sullivan's Island?
What is the average length of the day in September in Sullivan's Island?
What time are sunrise and sunset in September in Sullivan's Island?
How many hours of sunshine does Sullivan's Island have in September?
What is the UV index intensity in September in Sullivan's Island?
Average temperature in September
Sullivan's Island, SC
- Average high temperature in September: 82.9°F
The warmest month (with the highest average high temperature) is July (86.5°F).
The month with the lowest average high temperature is January (57°F).
- Average low temperature in September: 74.3°F
The month with the highest average low temperature is July (78.3°F).
The coldest month (with the lowest average low temperature) is January (45.5°F).
Average pressure in September
Sullivan's Island, SC
- Average pressure in September: 30"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.98"Hg).
Average wind speed in September
Sullivan's Island, SC
- Average wind speed in September: 9.2mph
The windiest months (with the highest average wind speed) are March and April (10.3mph).
The calmest month (with the lowest average wind speed) is August (8.4mph).
Average humidity in September
Sullivan's Island, SC
- Average humidity in September: 76%
The month with the highest relative humidity is December (78%).
The months with the lowest relative humidity are January and March (73%).
Average rainfall in September
Sullivan's Island, SC
- Average rainfall in September: 5.71"
The wettest month (with the highest rainfall) is August (8.23").
The driest month (with the least rainfall) is January (1.42").
Average rainfall days in September
Sullivan's Island, SC
- Average rainfall days in September: 19.2 days
The month with the highest number of rainy days is August (25.9 days).
The month with the least rainy days is November (8.5 days).
Average snowfall days in September
Sullivan's Island, SC
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (0.3 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October, November and December (0 days).
Average daylight in September /
Average sunshine in September
Sullivan's Island, SC
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in September: 9h and 1min
The month with the most sunshine is July (Average sunshine: 11h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 42min).
Average sunshine days in September
Sullivan's Island, SC
- Average sunshine days in September: 7.9 days
The month with the most sunshine days is January (19.3 days).
The month with the least sunshine days is August (2.8 days).
Average UV index in September
Sullivan's Island, SC
- Average UV index in September: 6
The months with the highest UV index are May, June, July and August (UV index 7).
The month with the lowest UV index is January (UV index 3).
Average cloud cover in September
Sullivan's Island, SC
- Average cloud cover in September: 28
The month with the most cloud cover is December (Cloud cover 39).
The month with the least cloud cover is June (Cloud cover 25).
Average visibility in September
Sullivan's Island, SC
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Sullivan's Island, South Carolina, USA
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