September weather forecast
Cassatt, SC

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Weather in September

The first month of the autumn, September, is still a warm month in Cassatt, South Carolina, with an average temperature varying between 83.3°F (28.5°C) and 66.2°F (19°C).

Temperature

Cassatt starts September with an average high-temperature of a warm 83.3°F (28.5°C), hinting at a minimal fluctuation from August. Throughout September, the temperature tends to fall to a consistent average low of 66.2°F (19°C).

Heat index

September's mean heat index is evaluated at a hot 89.6°F (32°C). Enduring exposure and continuous activity might cause a feeling of tiredness and induce heat cramps.
Be informed that the heat index values are oriented around shady conditions and gentle breezes. Uninterrupted exposure to the sun may boost the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', is derived by integrating air temperature with the existing relative humidity to express the perceived warmth. Elements such as metabolic variations, pregnancy, and physical exertion can influence one's weather perception. You should know that direct sun exposure can heighten weather effects, potentially elevating the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. Kids frequently fail to realize the necessity for resting and hydrating. Thirst is an advanced indication of dehydration - hence, maintaining hydration, especially during extended physical activities, becomes essential.

Humidity

In Cassatt, the average relative humidity in September is 74%.

Rainfall

September is the month with the least rainfall. Rain falls for 9.5 days and accumulates 0.59" (15mm) of precipitation.

Snowfall

In Cassatt, snow does not fall in March through December.

Daylight

In September, the average length of the day is 12h and 23min.
On the first day of the month, sunrise is at 6:55 am and sunset at 7:47 pm. On the last day of September, sunrise is at 7:16 am and sunset at 7:06 pm EDT.

Sunshine

The average sunshine in September is 9h.

UV index

In September, the average daily maximum UV index is 6. A UV Index reading of 6 to 7 represents a high health risk from unprotected exposure to Sun's UV rays for the ordinary person.
Note: An average UV index of 6 in September transforms into this advice:
Skirt overexposure. People with light complexions might get scorched in under 20 minutes. Stay in the shade and limit sun exposure from 10 a.m. to 4 p.m., when UV radiation is most potent. Keep in mind that shade structures like parasols or canopies do not offer full protection. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.
Updated: Jul 24, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How hot does it get in September?

The high-temperature, in September, in Cassatt, is 83.3°F (28.5°C), while the low-temperature averages to 66.2°F (19°C). The average heat index (a.k.a. 'felt air temperature', 'real feel'), which represents the influence of relative humidity on air temperature, in September is evaluated at 89.6°F (32°C).

What is the average humidity in September?

In September, the average relative humidity is 74%.

What is the driest month in Cassatt?

The month with the least rainfall is September, when the rain falls for 9.5 days and typically collects 0.59" (15mm) of precipitation.

How much does it rain in September?

In Cassatt, in September, during 9.5 rainfall days, 0.59" (15mm) of precipitation is typically accumulated.

When it does not snow?

March through December are months without snowfall.

How many hours of daylight does Cassatt have in September?

The average day length in September in Cassatt is 12h and 23min.

When is the sunrise / sunset in September?

In September, on the first day of the month, sunrise is at 6:55 am and sunset at 7:47 pm. On the last day of the month, sunrise is at 7:16 am and sunset at 7:06 pm EDT.

How many hours of sunshine does Cassatt have in September?

In Cassatt, the average sunshine duration in September is 9h.

How high is the UV index in September in Cassatt?

In September, the average daily maximum UV index in Cassatt is 6. A UV Index estimate of 6 to 7 represents a high health risk 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
Cassatt, SC

Average temperature in September - Cassatt, SC
  • Average high temperature in September: 83.3°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 (52.2°F).

  • Average low temperature in September: 66.2°F

The month with the highest average low temperature is July (72.7°F).
The coldest month (with the lowest average low temperature) is January (37.4°F).

Average pressure in September
Cassatt, SC

Average pressure in September - Cassatt, SC
  • Average pressure in September: 30.01"Hg

The months with the highest atmospheric pressure are January, November and December (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.97"Hg).

Average wind speed in September
Cassatt, SC

Average wind speed in September - Cassatt, SC
  • Average wind speed in September: 6mph

The windiest months (with the highest average wind speed) are February and April (8.4mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).

Average humidity in September
Cassatt, SC

Average humidity in September - Cassatt, SC
  • Average humidity in September: 74%

The month with the highest relative humidity is May (75%).
The months with the lowest relative humidity are January, March and November (70%).

Average rainfall in September
Cassatt, SC

Average rainfall in September - Cassatt, SC
  • Average rainfall in September: 0.59"

The wettest month (with the highest rainfall) is August (1.42").
The driest month (with the least rainfall) is September (0.59").

Average rainfall days in September
Cassatt, SC

Average rainfall days in September - Cassatt, SC
  • Average rainfall days in September: 9.5 days

The month with the highest number of rainy days is July (13.8 days).
The month with the least rainy days is November (5.8 days).

Average snowfall in September
Cassatt, SC

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

The month with the highest snowfall is February (0.08").
The months with the least snowfall are March, April, May, June, July, August, September, October, November and December (0").

Average snowfall days in September
Cassatt, SC

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

The month with the highest number of snowfall days is February (0.5 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October and December (0 days).

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

Average daylight in September / Average sunshine in September - Cassatt, SC
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).

  • Average sunshine in September: 9h and 0min

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

Average sunshine days in September
Cassatt, SC

Average sunshine days in September - Cassatt, SC
  • Average sunshine days in September: 18.7 days

The month with the most sunshine days is October (23.9 days).
The month with the least sunshine days is July (13.3 days).

Average UV index in September
Cassatt, SC

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

The months with the highest UV index are June and July (UV index 7).
The month with the lowest UV index is January (UV index 2).

Average cloud cover in September
Cassatt, SC

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

The month with the most cloud cover is February (Cloud cover 41).
The months with the least cloud cover are June and October (Cloud cover 28).

Average visibility in September
Cassatt, SC

Average visibility in September - Cassatt, 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).

Cassatt, South Carolina, USA

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