Cainhoy
South Carolina, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Cainhoy, SC

The first month of the autumn, September, is still a warm month in Cainhoy, South Carolina, with average temperature ranging between min 67.3°F (19.6°C) and max 84.7°F (29.3°C).

Temperature

In September, the average high-temperature is almost the same as in August - a moderately hot 84.7°F (29.3°C). In September, in Cainhoy, the average low-temperature is 67.3°F (19.6°C).

Heat index

In September, the average heat index is evaluated at a sweltering 95.4°F (35.2°C). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Note that heat index values are valued for light wind and location in the shade. With the 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 'felt air temperature', 'feels like', 'apparent temperature', or 'real feel', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. Additional factors like clothing, metabolic differences, differences in body mass, height, and shape, and activity influence one's weather impression. Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. 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.
The human body normally cools itself by perspiration, as evaporated sweat carries heat away from the body. With a lot of moisture in the air, the evaporation process is not as effective, and the body does not cool down as efficiently, creating a perception of overheating. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

The average relative humidity in Cainhoy is 78.2%.

Rainfall

In Cainhoy, during September, the rain falls for 10 days and regularly aggregates up to 6.1" (154.9mm) of precipitation. Throughout the year, there are 112.7 rainfall days, and 51" (1296.1mm) of precipitation is accumulated.

Snowfall

Throughout the year, in Cainhoy, 0.7" (17.8mm) of snow is accumulated.

Daylight

In September, the average length of the day in Cainhoy is 12.4h.

Sunshine

The average sunshine in September in Cainhoy is 7.3h.

What is the temperature in September in Cainhoy?

In September, the average high-temperature is 84.7°F (29.3°C), and the average low-temperature is 67.3°F (19.6°C). The average heat index (a.k.a. 'real feel', 'felt air temperature'), that represents influence of the relative humidity to air temperaure, in September is evaluated at 95.4°F (35.2°C).

What is the average humidity in September in Cainhoy?

The average relative humidity in September is 78.2%.

How much does it rain in Cainhoy in September?

In Cainhoy, South Carolina, during September, the rain falls for 10 days and regularly aggregates up to 6.1" (154.9mm) of precipitation.

What is the average length of the day in September in Cainhoy?

In Cainhoy, South Carolina, the average length of the day in September is 12.4h.

How many hours of sunshine does Cainhoy have in September?

In September, the average sunshine in Cainhoy is 7.3h.
Average temperature in September - Cainhoy, SC
  • Average high temperature in September: 84.8°F

The warmest month (with the highest average high temperature) is July (91.1°F).
The month with the lowest average high temperature is January (59°F).

  • Average low temperature in September: 67.2°F

The month with the highest average low temperature is July (73°F).
The coldest month (with the lowest average low temperature) is January (37.5°F).

Average humidity in September - Cainhoy, SC
  • Average humidity in September: 78.2%

The month with the highest relative humidity is August (78.9%).
The month with the lowest relative humidity is February (67.4%).

Average rainfall in September - Cainhoy, SC
  • Average rainfall in September: 6.1"

The wettest month (with the highest rainfall) is August (7.2").
The driest month (with the lowest rainfall) is November (2.4").

Average rainfall days in September - Cainhoy, SC
  • Average rainfall days in September: 10 days

The month with the highest number of rainy days is August (13.2 days).
The month with the lowest number of rainy days is November (7 days).

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

The month with the highest snowfall is December (0.5").
Months with the lowest snowfall are January, March, April, May, June, July, August, September, October and November (0").

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

Months with the highest number of snowfall days are February and December (0.2 days).
Months with the lowest number of snowfall days are March, April, May, June, July, August, September, October and November (0 days).

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

The month with the longest days is June (Average daylight: 14.3h).
The month with shortest days is December (Average daylight: 10h).

  • Average sunshine in September: 7.3h

The month with most sunshine is May (Average sunshine: 9.5h).
The month with least sunshine is December (Average sunshine: 5.5h).