September weather forecast
Williston, SC

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Weather in September

September, the first month of the autumn in Williston, is also a moderately hot month, with an average temperature varying between 84°F (28.9°C) and 67.6°F (19.8°C).

Temperature

The arrival of September brings an average high-temperature of a warm 84°F (28.9°C), nearly identical to August's 88.9°F (31.6°C). In September, the average low-temperature is a comfortable 67.6°F (19.8°C).

Heat index

The heat index for September is calculated to be a hot 91.4°F (33°C). Take greater precautions, heat exhaustion and heat cramps may be expected. Heatstroke could result from lengthy activity.
Know that the heat index computations account for shaded terrains and slight winds. Exposure to unobstructed sunshine could lead to an increase in the heat index 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 shape one's weather perception. Direct sunlight can potentially raise the heat index by 15 Fahrenheit (8 Celsius) degrees, so it's crucial to consider. Heat index values are primarily vital for children. Children often overlook the necessity for resting and fluid replenishment. Thirst is a late sign of dehydration - thus, it is critical to stay hydrated, especially during extended periods of physical activities.

Humidity

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

Rainfall

In September, the rain falls for 12.7 days. Throughout September, 1.85" (47mm) of precipitation is accumulated. Throughout the year, in Williston, there are 157.7 rainfall days, and 30.2" (767mm) of precipitation is accumulated.

Snowfall

In Williston, snow does not fall in March through November.

Daylight

The average length of the day in September is 12h and 22min.
On the first day of September, sunrise is at 7:00 am and sunset at 7:50 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 7:11 pm EDT.

Sunshine

In September, the average sunshine is 8.5h.

UV index

In Williston, the average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high health risk from unprotected exposure to Sun's UV rays for the ordinary person.
Note: In September, the average maximum UV index of 6 translates into the following recommendations:
Continue precautions and advocate sun safety advice. Deterrence of sunburn is indispensable. Avoid exposure to the Sun and try to stay in the shade between 10 a.m. and 4 p.m., when UV radiation is most potent, but be aware that parasols or canopies may not offer full protection. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation.

Frequently asked questions

Is it hot during September?

In Williston, 84°F (28.9°C) is the average high-temperature and 67.6°F (19.8°C) is the average low-temperature during September. In September, the average heat index (a.k.a. 'feels like', 'apparent temperature'), which combines relative humidity and air temperature, is calculated to be 91.4°F (33°C).

What is the average humidity in September?

In September, the average relative humidity is 74%.

How many days does it rain in September?

In September, the rain falls for 12.7 days. Throughout September, 1.85" (47mm) of precipitation is accumulated.

When it does not snow?

In Williston, snow does not fall in March through November.

What is the average length of the day in September?

The average day length in September is 12h and 22min.

When is the sunrise / sunset in September?

In September, on the first day of the month, sunrise is at 7:00 am and sunset at 7:50 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 7:11 pm EDT.

How long on average sun shines in September?

In September, the average sunshine duration is 8.5h.

What is the UV index intensity in September?

In September, the average daily maximum UV index is 6. A UV Index estimate of 6 to 7 represents a high hazard to health from unsafe 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
Williston, SC

Average temperature in September - Williston, SC
  • Average high temperature in September: 84°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 (54°F).

  • Average low temperature in September: 67.6°F

The month with the highest average low temperature is July (73.4°F).
The coldest month (with the lowest average low temperature) is January (38.8°F).

Average pressure in September
Williston, SC

Average pressure in September - Williston, 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
Williston, SC

Average wind speed in September - Williston, SC
  • Average wind speed in September: 6.4mph

The windiest months (with the highest average wind speed) are February, March and April (8.6mph).
The calmest month (with the lowest average wind speed) is August (5.8mph).

Average humidity in September
Williston, SC

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

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

Average rainfall in September
Williston, SC

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

The wettest month (with the highest rainfall) is December (3.35").
The driest month (with the least rainfall) is November (1.77").

Average rainfall days in September
Williston, SC

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

The month with the highest number of rainy days is July (19 days).
The month with the least rainy days is November (8.2 days).

Average snowfall in September
Williston, SC

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

The month with the highest snowfall is January (0.31").
The months with the least snowfall are March, April, May, June, July, August, September, October and November (0").

Average snowfall days in September
Williston, SC

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

The month with the highest number of snowfall days is January (0.6 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
Williston, SC

Average daylight in September / Average sunshine in September - Williston, 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: 10h and 54min).
The month with the least sunshine is December (Average sunshine: 5h and 24min).

Average sunshine days in September
Williston, SC

Average sunshine days in September - Williston, SC
  • Average sunshine days in September: 14.7 days

The month with the most sunshine days is October (20.5 days).
The month with the least sunshine days is July (9.4 days).

Average UV index in September
Williston, SC

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

The months with the highest UV index are June and July (UV index 7).
The months with the lowest UV index are January and December (UV index 3).

Average cloud cover in September
Williston, SC

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

The month with the most cloud cover is December (Cloud cover 42).
The month with the least cloud cover is October (Cloud cover 28).

Average visibility in September
Williston, SC

Average visibility in September - Williston, 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).

Williston, South Carolina, USA

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