September weather forecast
Rion, SC

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Weather in September

September, the first month of the autumn in Rion, is also a moderately hot month, with temperature in the range of an average high of 84°F (28.9°C) and an average low of 65.3°F (18.5°C).

Temperature

Rion experiences a moderate temperature shift at the start of September, with average high-temperatures adjusting a bit from a hot 89.6°F (32°C) in August to a moderately hot 84°F (28.9°C). Throughout September nights, Rion registers an average low-temperature of 65.3°F (18.5°C).

Heat index

For most parts of September, the heat index is computed to be a hot 91.4°F (33°C). Adopt heightened preventive measures, heat exhaustion and heat cramps are probable. Persistent activity could lead to heatstroke.
Heat index determinations are made taking into account the shade and light air movements. A rise of up to 15 Fahrenheit (8 Celsius) degrees in the heat index could result from direct sunlight.
Note: The heat index, also known as 'real feel' or 'feels like', is a numerical representation of warmth when taking temperature and moisture levels into account. Factors encompassing physical activity, clothing, and metabolic differences have a role in shaping the individual's impression of temperature. Awareness of direct sun exposure is crucial as it has the potential to heighten the weather's effects, pushing up the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly important for children. Kids frequently ignore the importance of taking a break and rehydrating. Thirst is a late symptom of dehydration - thus, it is crucial to stay hydrated, especially during long-lasting physical activities.

Humidity

In September, the average relative humidity is 73%.

Rainfall

September is the month with the least rainfall. Rain falls for 12.7 days and accumulates 1.85" (47mm) of precipitation.

Snowfall

In Rion, snow does not fall in April through October.

Daylight

In Rion, South Carolina, the average length of the day in September is 12h and 23min.
On the first day of September, sunrise is at 6:58 am and sunset at 7:50 pm. On the last day of the month, sunrise is at 7:18 am and sunset at 7:09 pm EDT.

Sunshine

The average sunshine in September is 8.7h.

UV index

The average daily maximum UV index in September is 6. A UV Index of 6 to 7 symbolizes a high threat to health from unprotected exposure to Sun's UV rays for average individuals.
Note: A maximum daily UV index of 6 during September morphs into the following directions:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. The Sun's UV radiation is most potent between the hours of 10 a.m. and 4 p.m. Try to avoid direct sunlight during this time. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.

Frequently asked questions

How hot is September?

The high-temperature, in September, in Rion, is 84°F (28.9°C), while the low-temperature averages to 65.3°F (18.5°C). In September, the average heat index (a.k.a. 'apparent temperature', 'real feel'), which calculates the temperature value influenced by the moisture in the air, is computed to be 91.4°F (33°C).

What is the average humidity in September?

The average relative humidity in September is 73%.

What is the driest month in Rion?

September is the month with the least rainfall. Rain falls for 12.7 days and accumulates 1.85" (47mm) of precipitation.

How much does it rain in Rion in September?

In Rion, in September, during 12.7 rainfall days, 1.85" (47mm) of precipitation is typically accumulated.

When it does not snow?

April through October are months without snowfall.

How many hours of daylight does Rion have in September?

In Rion, the average day length in September is 12h and 23min.

What time are sunrise and sunset in September?

On the first day of September, sunrise is at 6:58 am and sunset at 7:50 pm. On the last day of the month, sunrise is at 7:18 am and sunset at 7:09 pm EDT.

How many hours of sunshine does Rion have in September?

In September, the average sunshine duration is 8.7h.

What is the UV index intensity in September?

In September, the average daily maximum UV index in Rion is 6. A UV Index reading of 6 to 7 represents a high health threat from exposure to the Sun's UV radiation.
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
Rion, SC

Average temperature in September - Rion, SC
  • Average high temperature in September: 84°F

The warmest month (with the highest average high temperature) is July (91.6°F).
The month with the lowest average high temperature is January (51.4°F).

  • Average low temperature in September: 65.3°F

The month with the highest average low temperature is July (71.8°F).
The coldest month (with the lowest average low temperature) is January (36.1°F).

Average pressure in September
Rion, SC

Average pressure in September - Rion, SC
  • Average pressure in September: 30.02"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
Rion, SC

Average wind speed in September - Rion, SC
  • Average wind speed in September: 5.5mph

The windiest months (with the highest average wind speed) are February and April (7.9mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).

Average humidity in September
Rion, SC

Average humidity in September - Rion, SC
  • Average humidity in September: 73%

The months with the highest relative humidity are May and December (75%).
The months with the lowest relative humidity are June, July and November (71%).

Average rainfall in September
Rion, SC

Average rainfall in September - Rion, SC
  • Average rainfall in September: 1.85"

The wettest month (with the highest rainfall) is December (3.5").
The driest month (with the least rainfall) is September (1.85").

Average rainfall days in September
Rion, SC

Average rainfall days in September - Rion, SC
  • Average rainfall days in September: 12.7 days

The month with the highest number of rainy days is July (18 days).
The months with the least rainy days are October and November (9 days).

Average snowfall in September
Rion, SC

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

The month with the highest snowfall is February (0.83").
The months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in September
Rion, SC

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

The month with the highest number of snowfall days is February (1.2 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

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

Average daylight in September / Average sunshine in September - Rion, 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: 8h and 4min

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 24min).

Average sunshine days in September
Rion, SC

Average sunshine days in September - Rion, SC
  • Average sunshine days in September: 15.7 days

The month with the most sunshine days is October (20.9 days).
The month with the least sunshine days is July (10.5 days).

Average UV index in September
Rion, SC

Average UV index in September - Rion, 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
Rion, SC

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

The months with the most cloud cover are February and December (Cloud cover 42).
The month with the least cloud cover is June (Cloud cover 28).

Average visibility in September
Rion, SC

Average visibility in September - Rion, 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).

Rion, South Carolina, USA

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