September weather forecastRock Hill, SC
September
Weather in September
The arrival of September brings a break in Rock Hill's heat as the summer gradually fizzles out, giving way to fall. This month ushers in cooling temperatures, making it one of the more comfortable months of the year in Rock Hill. September brings with it lowered rainfall to 1.97" (50mm), representing a significant drop from August's peak. This reduction in rainfall corresponds with a decrease in the number of rainy days, averaging 11.2 in September. Notably, the wind speed picks up slightly, averaging 5.3 MPH as the fall season sets in.Temperature
September is characterized by a mild reduction in the average high-temperature, from a hot 88.9°F (31.6°C) in August to a moderately hot 83.3°F (28.5°C). Rock Hill observes an average nighttime low-temperature of 64°F (17.8°C) during the month of September.Heat index
The heat index in September is computed to be a hot 89.6°F (32°C). If exposure and ongoing activity persist, they might induce a state of tiredness and heat cramps.Remember that heat index calculations are made for conditions in the shade with light wind. Heat index values can rise by 15 Fahrenheit (8 Celsius) degrees when in direct sunlight.
Note: The heat index, also known as 'feels like' or 'apparent temperature', takes into account both air temperature and humidity to illustrate what people actually feel. Elements such as metabolic variations, pregnancy, and physical exertion can influence one's weather perception. Direct sun rays can make one feel hotter, potentially raising the heat index by 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's vital to remain hydrated, particularly during prolonged physical activities.
Humidity
The average relative humidity in September in Rock Hill is 71%.Rainfall
The month with the least rainfall is September, when the rain falls for 11.2 days and typically collects 1.97" (50mm) of precipitation.Snowfall
April through November are months without snowfall.Daylight
In Rock Hill, the average length of the day in September is 12h and 23min.On the first day of the month, sunrise is at 6:57 am and sunset at 7:50 pm. On the last day of September, in Rock Hill, sunrise is at 7:18 am and sunset at 7:09 pm EDT.
Sunshine
In Rock Hill, the average sunshine in September is 8.6h.UV index
The average daily maximum UV index in September in Rock Hill is 5. A UV Index estimate of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for the average person.Note: During September, 5 as the daily maximum UV index converts into the following advice:
Make use of precautions - It is urged to ward off sun damage. Minimize direct exposure to the Sun during midday when its radiation is at its peak. Experience reduced UV exposure by about half when donning a wide-brim hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Rock Hill, SC
- Average high temperature in September: 83.3°F
The warmest month (with the highest average high temperature) is July (91.2°F).
The month with the lowest average high temperature is January (49.6°F).
- Average low temperature in September: 64°F
The month with the highest average low temperature is July (70.7°F).
The coldest month (with the lowest average low temperature) is January (34.2°F).
Average pressure in September
Rock Hill, SC
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is November (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.98"Hg).
Average wind speed in September
Rock Hill, SC
- Average wind speed in September: 5.3mph
The windiest month (with the highest average wind speed) is April (7.7mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).
Average humidity in September
Rock Hill, SC
- Average humidity in September: 71%
The month with the highest relative humidity is December (75%).
The month with the lowest relative humidity is July (69%).
Average rainfall in September
Rock Hill, SC
- Average rainfall in September: 1.97"
The wettest month (with the highest rainfall) is December (3.46").
The driest month (with the least rainfall) is September (1.97").
Average rainfall days in September
Rock Hill, SC
- Average rainfall days in September: 11.2 days
The month with the highest number of rainy days is July (18.1 days).
The month with the least rainy days is November (9.6 days).
Average snowfall in September
Rock Hill, SC
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.34").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").
Average snowfall days in September
Rock Hill, SC
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (1.7 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
Rock Hill, SC
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 54min).
- Average sunshine in September: 8h and 36min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 5h and 18min).
Average sunshine days in September
Rock Hill, SC
- Average sunshine days in September: 17.4 days
The month with the most sunshine days is October (20.3 days).
The month with the least sunshine days is July (10.8 days).
Average UV index in September
Rock Hill, SC
- Average UV index in September: 5
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January and December (UV index 2).
Average cloud cover in September
Rock Hill, SC
- Average cloud cover in September: 34
The month with the most cloud cover is February (Cloud cover 44).
The month with the least cloud cover is June (Cloud cover 30).
Average visibility in September
Rock Hill, 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).
