September weather forecast
Otranto, SC

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Weather in September

The first month of the autumn, September, is still a warm month in Otranto, South Carolina, with an average temperature fluctuating between 85.1°F (29.5°C) and 70.9°F (21.6°C).

Temperature

Shifting into September, Otranto records an average high-temperature of a moderately hot 85.1°F (29.5°C), presenting minor fluctuations compared to the previous month. Otranto reports a consistent average low-temperature of 70.9°F (21.6°C) throughout September nights.

Heat index

The heat index for September is calculated to be a very hot 95°F (35°C). Ensure heightened precautions, risk of heat cramps and heat exhaustion is significant. Sustained activity could provoke heatstroke.
When considering the heat index, it's pivotal to note it is for shade and mild wind conditions. 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', reflects the blend of air temperature and relative humidity to give a temperature impression. Elements such as metabolic variations, being pregnant, and physical activity can impact one's weather perception. One's exposure to direct sunlight has the potential to intensify the heat sensation, increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Young individuals are typically more threatened than adults due to their reduced perspiration. Also, the larger skin surface proportionate to their small bodies and the increased heat from their activities magnify their risk.
When it comes to cooling down, the human body's primary method is through perspiration, making use of sweat evaporation to eliminate excess heat. When there is abundant moisture in the air, the body's cooling through the evaporation process becomes less effective, leading to the sensation of overheating. Excessive heat that's not properly managed leads to increased body temperatures and resultant health issues.

Humidity

In September, the average relative humidity is 75%.

Rainfall

In September, in Otranto, the rain falls for 16.5 days. Throughout September, 4.02" (102mm) of precipitation is accumulated. In Otranto, during the entire year, the rain falls for 172.6 days and collects up to 39.13" (994mm) of precipitation.

Snowfall

In Otranto, snow does not fall in March through November.

Daylight

In September, the average length of the day is 12h and 22min.
On the first day of September, sunrise is at 6:55 am and sunset at 7:44 pm. On the last day of the month, sunrise is at 7:14 am and sunset at 7:05 pm EDT.

Sunshine

In Otranto, the average sunshine in September is 8.9h.

UV index

In Otranto, South Carolina, the average daily maximum UV index in September is 6. A UV Index reading of 6 to 7 represents a high health hazard from exposure to the Sun's UV radiation for the average person.
Note: A daily maximum UV index of 6 in September translates into the following instructions:
Resist extreme sun exposure. Guarding against solar damage is essential. Avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is most intense, and remember that not all shade structures provide full protection. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses.
Updated: Aug 14, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How hot is it in September?

Otranto in September has an average high-temperature of 85.1°F (29.5°C) and an average low-temperature of 70.9°F (21.6°C). The average heat index (a.k.a. 'felt air temperature', 'real feel'), which factors the actual air temperature with the relative humidity, in September is calculated to be 95°F (35°C).

What is the average humidity in September?

In September, the average relative humidity is 75%.

How much does it rain in September?

In Otranto, in September, during 16.5 rainfall days, 4.02" (102mm) of precipitation is typically accumulated.

When it does not snow?

March through November are months without snowfall.

What is the average length of the day in September?

In Otranto, the average day length in September is 12h and 22min.

When are sunrise and sunset in September?

On the first day of September, sunrise is at 6:55 am and sunset at 7:44 pm. On the last day of the month, sunrise is at 7:14 am and sunset at 7:05 pm EDT.

How long on average sun shines in September?

The average sunshine duration in September is 8.9h.

What is the UV index reading in September?

The average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Otranto, SC

Average temperature in September - Otranto, SC
  • Average high temperature in September: 85.1°F

The warmest month (with the highest average high temperature) is July (90.5°F).
The month with the lowest average high temperature is January (56.8°F).

  • Average low temperature in September: 70.9°F

The month with the highest average low temperature is July (75.7°F).
The coldest month (with the lowest average low temperature) is January (41.5°F).

Average pressure in September
Otranto, SC

Average pressure in September - Otranto, SC
  • Average pressure in September: 30"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The months with the lowest atmospheric pressure are June and August (29.98"Hg).

Average wind speed in September
Otranto, SC

Average wind speed in September - Otranto, SC
  • Average wind speed in September: 6.5mph

The windiest month (with the highest average wind speed) is April (7.6mph).
The calmest month (with the lowest average wind speed) is August (5.8mph).

Average humidity in September
Otranto, SC

Average humidity in September - Otranto, SC
  • Average humidity in September: 75%

The month with the highest relative humidity is December (77%).
The months with the lowest relative humidity are January and March (72%).

Average rainfall in September
Otranto, SC

Average rainfall in September - Otranto, SC
  • Average rainfall in September: 4.02"

The wettest month (with the highest rainfall) is August (6.22").
The driest month (with the least rainfall) is January (1.46").

Average rainfall days in September
Otranto, SC

Average rainfall days in September - Otranto, SC
  • Average rainfall days in September: 16.5 days

The month with the highest number of rainy days is August (23.4 days).
The month with the least rainy days is November (8.2 days).

Average snowfall in September
Otranto, SC

Average snowfall in September - Otranto, SC
  • Average snowfall in September: 0"

The month with the highest snowfall is February (0.28").
The months with the least snowfall are March, April, May, June, July, August, September, October and November (0").

Average snowfall days in September
Otranto, SC

Average snowfall days in September - Otranto, SC
  • Average snowfall days in September: 0 days

The months with the highest number of snowfall days are January and February (0.3 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).

Average daylight in September /
Average sunshine in September
Otranto, SC

Average daylight in September / Average sunshine in September - Otranto, 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: 8h and 5min

The month with the most sunshine is July (Average sunshine: 10h and 54min).
The month with the least sunshine is December (Average sunshine: 5h and 36min).

Average sunshine days in September
Otranto, SC

Average sunshine days in September - Otranto, SC
  • Average sunshine days in September: 11.6 days

The month with the most sunshine days is October (20.5 days).
The month with the least sunshine days is August (5.8 days).

Average UV index in September
Otranto, SC

Average UV index in September - Otranto, SC
  • Average UV index in September: 6

The 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).

Average cloud cover in September
Otranto, SC

Average cloud cover in September - Otranto, SC
  • Average cloud cover in September: 31

The month with the most cloud cover is December (Cloud cover 41).
The months with the least cloud cover are June and July (Cloud cover 27).

Average visibility in September
Otranto, SC

Average visibility in September - Otranto, 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).

Otranto, South Carolina, USA

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