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 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 transition into September marks the average high-temperature at a warm 85.3°F (29.6°C), differing minimally from August's 90.1°F (32.3°C). Shirley registers a consistent average low-temperature of 68.4°F (20.2°C) during September.Heat index
The heat index in September is evaluated at a fiery hot 95°F (35°C). Take greater precautions, heat exhaustion and heat cramps may be expected. Heatstroke could result from lengthy activity.Metrics for the heat index primarily focus on shaded spots and light wind conditions. The heat index can potentially augment by 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'real feel' or 'feels like', is an aggregate value of air's warmth and moisture to show the human-felt temperature. Depending on the activity and the individual's heat perception, which may vary due to factors including wind, clothing, and metabolic variations, this effect remains subjective. It is noteworthy to mention that direct sunlight exposure can augment the felt temperature, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young ones regularly neglect the requirement for rest and fluid replenishment. Thirst is a late stage of dehydration - so, it is necessary to keep hydrated, particularly during extended periods of physical exertion.
To combat high temperatures, the human body perspires and relies on sweat evaporation for cooling. An increase in relative humidity retards evaporation, subsequently reducing the body's heat removal rate and leading to a sensation of being overly warm. Potential thermal conditions emerge as the body's heat gain outpaces its cooling mechanisms.
Humidity
In Shirley, South Carolina, the average relative humidity in September is 76%.Rainfall
In Shirley, South Carolina, during September, the rain falls for 14.3 days and regularly aggregates up to 1.97" (50mm) of precipitation. In Shirley, during the entire year, the rain falls for 158.7 days and collects up to 30.28" (769mm) of precipitation.Snowfall
March through November are months without snowfall.Daylight
In September, the average length of the day in Shirley is 12h and 22min.On the first day of the month, sunrise is at 7:00 am and sunset at 7:49 pm. On the last day of September, sunrise is at 7:19 am and sunset at 7:10 pm EDT.
Sunshine
The average sunshine in September is 8.5h.UV index
The average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV rays for the ordinary person.Note: The maximum UV index of 6 during September translates into these guidelines:
Employ safeguards and advocate sun safety protocols. Shielding against skin and eye damage is crucial. Make an effort to avoid direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation, and note that objects like parasols or canopies might not offer full sun protection. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Is it hot in Shirley during September?
What is the average humidity in September in Shirley?
How many days does it rain in September in Shirley?
When it does not snow in Shirley?
How many hours of daylight does Shirley have in September?
When are sunrise and sunset in September in Shirley?
How many hours of sunshine does Shirley have in September?
What is the UV index reading in September in Shirley?
Average temperature in September
Shirley, SC
- Average high temperature in September: 85.3°F
The warmest month (with the highest average high temperature) is July (91°F).
The month with the lowest average high temperature is January (56.1°F).
- Average low temperature in September: 68.4°F
The months with the highest average low temperature are July and August (73.2°F).
The coldest month (with the lowest average low temperature) is January (39.9°F).
Average pressure in September
Shirley, 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 (29.97"Hg).
Average wind speed in September
Shirley, SC
- Average wind speed in September: 5.5mph
The windiest month (with the highest average wind speed) is April (7.1mph).
The calmest month (with the lowest average wind speed) is August (5.1mph).
Average humidity in September
Shirley, SC
- Average humidity in September: 76%
The month with the highest relative humidity is December (77%).
The month with the lowest relative humidity is January (71%).
Average rainfall in September
Shirley, SC
- Average rainfall in September: 1.97"
The wettest month (with the highest rainfall) is August (3.62").
The driest month (with the least rainfall) is November (1.38").
Average rainfall days in September
Shirley, SC
- Average rainfall days in September: 14.3 days
The month with the highest number of rainy days is August (20.2 days).
The month with the least rainy days is November (7.5 days).
Average snowfall in September
Shirley, SC
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.16").
The months with the least snowfall are March, April, May, June, July, August, September, October and November (0").
Average snowfall days in September
Shirley, 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 and November (0 days).
Average daylight in September /
Average sunshine in September
Shirley, 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 3min
The month with the most sunshine is July (Average sunshine: 11h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 30min).
Average sunshine days in September
Shirley, SC
- Average sunshine days in September: 13.5 days
The month with the most sunshine days is November (21 days).
The month with the least sunshine days is August (7.8 days).
Average UV index in September
Shirley, SC
- Average UV index in September: 6
The months with the highest UV index are June, July and August (UV index 7).
The months with the lowest UV index are January and December (UV index 3).
Average cloud cover in September
Shirley, SC
- Average cloud cover in September: 32
The months with the most cloud cover are February and December (Cloud cover 41).
The months with the least cloud cover are July and October (Cloud cover 29).
Average visibility in September
Shirley, 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).
Shirley, South Carolina, USA
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