September weather forecast
Myrtle Beach, SC

The glorious Myrtle Beach in South Carolina, with lit city buildings
The glorious Myrtle Beach in South Carolina, with lit city buildings

Weather in September

September, the first month of the autumn, in Myrtle Beach, is still a warm month, with temperature in the range of an average low of 71.4°F (21.9°C) and an average high of 81.7°F (27.6°C).

Temperature

In Myrtle Beach, the average high-temperature is almost the same as in August - a still warm 81.7°F (27.6°C). In September, in Myrtle Beach, South Carolina, the average low-temperature is 71.4°F (21.9°C).

Heat index

The average heat index is appraised at a hot 87.3°F (30.7°C). Exhaustion is likely with prolonged exposure and activity. Sustaining activity may result in heat cramps.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'real feel', 'feels like', or 'felt air temperature', is a measure of how hot it feels when the actual air humidity is factored in. Additional factors like pregnancy, differences in body mass, height, and shape, wind, and activity influence one's weather impression. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

The average relative humidity in Myrtle Beach, South Carolina, is 77%.

Rainfall

In Myrtle Beach, South Carolina,, it is raining for 15.6 days, with typically 3.35" (85mm) of accumulated precipitation. Throughout the year, there are 166.5 rainfall days, and 28.78" (731mm) of precipitation is accumulated.

Snowfall

March through November are months without snowfall.

Ocean temperature

In Myrtle Beach, the average water temperature is 80.6°F (27°C).
Note: Water temperature between 77°F (25°C) and 84.2°F (29°C) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

Daylight

In Myrtle Beach, the average length of the day is 12.4h.

Sunshine

In September, the average sunshine is 9.5h.

UV index

In Myrtle Beach, the average daily maximum UV index is 6. A UV Index value of 6 to 7 symbolizes a high health hazard from the exposure to the Sun's UV radiation for the average person.
Note: The daily maximum UV index of 6 interpret into the following advice:
Take precautions and utilize sun safety practices. Protection against the skin and eye damage is required. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.
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FAQ

What is the temperature in September in Myrtle Beach?

In September, in Myrtle Beach, the average high-temperature is 81.7°F (27.6°C), and the average low-temperature is 71.4°F (21.9°C). The average heat index (a.k.a. 'feels like', 'apparent temperature'), which factors the actual air temperature with the relative humidity, in September is appraised at 87.3°F (30.7°C).

What is the average humidity in September in Myrtle Beach?

In Myrtle Beach, South Carolina, the average relative humidity in September is 77%.

How much does it rain in Myrtle Beach in September?

In Myrtle Beach, South Carolina, in September, it is raining for 15.6 days, with typically 3.35" (85mm) of accumulated precipitation.

When it does not snow in Myrtle Beach?

In Myrtle Beach snow does not fall in March through November.

How warm is the water in September in Myrtle Beach?

In Myrtle Beach, South Carolina, the average seawater temperature in September is 80.6°F (27°C). Water temperature between 77°F (25°C) and 84.2°F (29°C) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

What is the average length of the day in September in Myrtle Beach?

The average length of the day in September in Myrtle Beach, South Carolina, is 12.4h.

How many hours of sunshine does Myrtle Beach have in September?

In September, the average sunshine in Myrtle Beach, South Carolina, is 9.5h.

What is the UV index reading in September in Myrtle Beach?

The average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high health threat from the exposure to the Sun's UV radiation.

Average temperature in September
Myrtle Beach, SC

Average temperature in September - Myrtle Beach, SC
  • Average high temperature in September: 27.6°C

The warmest month (with the highest average high temperature) is July (30.4°C).
The month with the lowest average high temperature is January (12.4°C).

  • Average low temperature in September: 21.9°C

The month with the highest average low temperature is July (24.6°C).
The coldest month (with the lowest average low temperature) is January (5.6°C).

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Average pressure in September
Myrtle Beach, SC

Average pressure in September - Myrtle Beach, SC
  • Average pressure in September: 1016mbar

The month with the highest atmospheric pressure is January (1020.4mbar).
The month with the lowest atmospheric pressure is June (1014.9mbar).

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Average wind speed in September
Myrtle Beach, SC

Average wind speed in September - Myrtle Beach, SC
  • Average wind speed in September: 14.4km/h

The windiest month (with the highest average wind speed) is April (16.2km/h).
The calmest month (with the lowest average wind speed) is August (12.7km/h).

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Average humidity in September
Myrtle Beach, SC

Average humidity in September - Myrtle Beach, SC
  • Average humidity in September: 77%

Months with the highest relative humidity are May, June, August and December (78%).
Months with the lowest relative humidity are January and November (74%).

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Average rainfall in September
Myrtle Beach, SC

Average rainfall in September - Myrtle Beach, SC
  • Average rainfall in September: 85mm

The wettest month (with the highest rainfall) is August (115mm).
The driest month (with the least rainfall) is January (26mm).

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Average rainfall days in September
Myrtle Beach, SC

Average rainfall days in September - Myrtle Beach, SC
  • Average rainfall days in September: 15.6 days

Months with the highest number of rainy days are July and August (19.8 days).
The month with the least rainy days is November (9.7 days).

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Average snowfall in September
Myrtle Beach, SC

Average snowfall in September - Myrtle Beach, SC
  • Average snowfall in September: 0mm

The month with the highest snowfall is February (2mm).
Months with the least snowfall are March, April, May, June, July, August, September, October and November (0mm).

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Average snowfall days in September
Myrtle Beach, SC

Average snowfall days in September - Myrtle Beach, SC
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (0.4 days).
Months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).

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Average sea temperature in September
Myrtle Beach, SC

Average sea temperature in September - Myrtle Beach, SC
  • Average sea temperature in September: 27°C

The best month for swimming (with the highest average sea temperature) is August (28.3°C).
The coldest month (with the lowest average sea temperature) is March (14.3°C).

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Average daylight in September /
Average sunshine in September
Myrtle Beach, SC

Average daylight in September / Average sunshine in September - Myrtle Beach, SC
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.4h).
The month with the shortest days is December (Average daylight: 9.9h).

  • Average sunshine in September: 9.5h

Months with the most sunshine are July and August (Average sunshine: 10.9h).
The month with the least sunshine is December (Average sunshine: 5.6h).

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Average sunshine days in September
Myrtle Beach, SC

Average sunshine days in September - Myrtle Beach, SC
  • Average sunshine days in September: 12.1 days

The month with the most sunshine days is October (19.1 days).
The month with the least sunshine days is June (8.2 days).

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Average UV index in September
Myrtle Beach, SC

Average UV index in September - Myrtle Beach, SC
  • Average UV index in September: 6

Months with the highest UV index are June, July and August (UV index 7).
The month with the lowest UV index is January (UV index 3).

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Average cloud cover in September
Myrtle Beach, SC

Average cloud cover in September - Myrtle Beach, SC
  • Average cloud cover in September: 29

Months with the most cloud cover are February and December (Cloud cover 40).
The month with the least cloud cover is June (Cloud cover 25).

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Average visibility in September
Myrtle Beach, SC

Average visibility in September - Myrtle Beach, SC
  • Average visibility in September: 10km

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).

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