September weather forecast
Simmonsville, MS

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Weather in September

The first month of the autumn, September, is still a tropical month in Simmonsville, Mississippi, with an average temperature varying between 68.4°F (20.2°C) and 87.1°F (30.6°C).

Temperature

With the onset of September, the average high-temperature registers at a still hot 87.1°F (30.6°C), subtly different from August's 90.5°F (32.5°C). Simmonsville's average low-temperature in September is measured at an agreeable 68.4°F (20.2°C).

Heat index

The average heat index in September is calculated to be a torrid 102.2°F (39°C). Exercise more precautions, heat cramps and heat exhaustion are potential risks. Continuous activity could precipitate heatstroke.
Know that the heat index computations account for shaded terrains and slight winds. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', is found by incorporating humidity levels into the air temperature measurement. An individual's perception of weather can be affected by a variety of elements including metabolic differences, being pregnant, and their level of physical exertion. Awareness is key; direct sunlight can enhance the weather's impact, possibly boosting the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance 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.
The human body normally cools itself by perspiration, as evaporated sweat carries heat away from the body. With a high level of moisture in the air, the evaporation process becomes less efficient, preventing the body from cooling down efficiently and resulting in a sensation of overheating. Should the body fail to balance its heat gain, the escalating temperature poses health challenges.

Humidity

In September, the average relative humidity is 77%.

Rainfall

In Simmonsville, Mississippi, during September, the rain falls for 16.9 days and regularly aggregates up to 2.56" (65mm) of precipitation. Throughout the year, there are 174 rainfall days, and 34.29" (871mm) of precipitation is accumulated.

Snowfall

In Simmonsville, snow does not fall in April through November.

Daylight

The average length of the day in September is 12h and 20min.
On the first day of September, sunrise is at 6:37 am and sunset at 7:24 pm. On the last day of the month, sunrise is at 6:54 am and sunset at 6:47 pm CDT.

Sunshine

In September, the average sunshine is 9.3h.

UV index

The average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high health risk from unsafe exposure to UV radiation for the average person.
Note: In September, the average maximum UV index of 6 translates into the following recommendations:
Avoid excessive sunlight. Those with lighter skin may experience burning in less than 20 minutes. Limit your exposure to the sun's UV radiation, which is strongest between 10 a.m. and 4 p.m., and note that parasols or canopies may not provide full sun protection. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration.
Updated: Jul 28, 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 Simmonsville, is 87.1°F (30.6°C), while the low-temperature averages to 68.4°F (20.2°C). In September, the average heat index (a.k.a. 'apparent temperature', 'feels like'), which calculates the temperature value influenced by the moisture in the air, is calculated to be 102.2°F (39°C).

What is the average humidity in September?

The average relative humidity in September is 77%.

How much does it rain in Simmonsville in September?

In September, the rain falls for 16.9 days. Throughout September, 2.56" (65mm) of precipitation is accumulated.

When it does not snow?

April through November are months without snowfall.

What is the average length of the day in September?

In Simmonsville, the average day length in September is 12h and 20min.

When is the sunrise / sunset in September?

In September, on the first day of the month, sunrise is at 6:37 am and sunset at 7:24 pm. On the last day of the month, sunrise is at 6:54 am and sunset at 6:47 pm CDT.

How long on average sun shines in September?

In September, the average sunshine duration is 9.3h.

What is the UV index reading in September?

The average daily maximum UV index in September is 6. A UV Index reading of 6 to 7 represents a high health threat 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
Simmonsville, MS

Average temperature in September - Simmonsville, MS
  • Average high temperature in September: 87.1°F

The warmest month (with the highest average high temperature) is July (91°F).
The month with the lowest average high temperature is January (56.8°F).

  • Average low temperature in September: 68.4°F

The months with the highest average low temperature are July and August (72.7°F).
The coldest month (with the lowest average low temperature) is January (40.3°F).

Average pressure in September
Simmonsville, MS

Average pressure in September - Simmonsville, MS
  • Average pressure in September: 29.98"Hg

The month with the highest atmospheric pressure is January (30.17"Hg).
The months with the lowest atmospheric pressure are June and August (29.97"Hg).

Average wind speed in September
Simmonsville, MS

Average wind speed in September - Simmonsville, MS
  • Average wind speed in September: 4.8mph

The windiest months (with the highest average wind speed) are February and April (6.8mph).
The calmest month (with the lowest average wind speed) is July (4.5mph).

Average humidity in September
Simmonsville, MS

Average humidity in September - Simmonsville, MS
  • Average humidity in September: 77%

The month with the highest relative humidity is December (81%).
The month with the lowest relative humidity is October (71%).

Average rainfall in September
Simmonsville, MS

Average rainfall in September - Simmonsville, MS
  • Average rainfall in September: 2.56"

The wettest month (with the highest rainfall) is August (4.13").
The driest month (with the least rainfall) is November (1.93").

Average rainfall days in September
Simmonsville, MS

Average rainfall days in September - Simmonsville, MS
  • Average rainfall days in September: 16.9 days

The month with the highest number of rainy days is July (20.9 days).
The month with the least rainy days is November (9 days).

Average snowfall in September
Simmonsville, MS

Average snowfall in September - Simmonsville, MS
  • Average snowfall in September: 0"

The months with the highest snowfall are January and December (0.24").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").

Average snowfall days in September
Simmonsville, MS

Average snowfall days in September - Simmonsville, MS
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (0.5 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
Simmonsville, MS

Average daylight in September / Average sunshine in September - Simmonsville, MS
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 6min).
The month with the shortest days is December (Average daylight: 10h and 12min).

  • Average sunshine in September: 9h and 2min

The month with the most sunshine is June (Average sunshine: 10h and 30min).
The months with the least sunshine are February and December (Average sunshine: 4h and 48min).

Average sunshine days in September
Simmonsville, MS

Average sunshine days in September - Simmonsville, MS
  • Average sunshine days in September: 11.2 days

The month with the most sunshine days is October (19 days).
The month with the least sunshine days is July (8.5 days).

Average UV index in September
Simmonsville, MS

Average UV index in September - Simmonsville, MS
  • 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
Simmonsville, MS

Average cloud cover in September - Simmonsville, MS
  • Average cloud cover in September: 33

The months with the most cloud cover are February and December (Cloud cover 50).
The month with the least cloud cover is October (Cloud cover 30).

Average visibility in September
Simmonsville, MS

Average visibility in September - Simmonsville, MS
  • Average visibility in September: 5mi

The months with the highest visibility are October and November (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September and December (5mi).

Simmonsville, Mississippi, USA

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