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
In September, the average high-temperature slightly decreases from a hot 91.9°F (33.3°C) in August to a warm 85.1°F (29.5°C). In Fort Smith, the average low-temperature is 63°F (17.2°C).Heat index
The average heat index in September is calculated to be a hot 93.2°F (34°C). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.Note that heat index values are valued for light wind and location in the shade. 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', 'felt air temperature', 'feels like', or 'apparent temperature', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. This effect is individual, with diverse people perceiving weather differently for numerous reasons (clothing, metabolic differences, differences in body mass, height, and shape), and activity. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.
Humidity
In Fort Smith, Arkansas, the average relative humidity in September is 71%.Rainfall
In Fort Smith, in September, during 10.6 rainfall days, 1.93" (49mm) of precipitation is typically accumulated. In Fort Smith, during the entire year, the rain falls for 131.9 days and collects up to 25.51" (648mm) of precipitation.Snowfall
April through November are months without snowfall in Fort Smith.Daylight
In Fort Smith, the average length of the day in September is 12h and 23min.On the first day of September, sunrise is at 6:49 am and sunset at 7:45 pm. On the last day of the month, sunrise is at 7:11 am and sunset at 7:03 pm CDT.
Sunshine
In September, the average sunshine in Fort Smith is 9.6h.UV index
In September, the average daily maximum UV index in Fort Smith is 5. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for the average person.Note: In September, the average maximum UV index of 5 translate into the following recommendations:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
FAQ
What is the temperature in September in Fort Smith?
What is the average humidity in September in Fort Smith?
How many days does it rain in September in Fort Smith?
When it does not snow in Fort Smith?
What is the average length of the day in September in Fort Smith?
When are sunrise and sunset in September in Fort Smith?
How long on average sun shines in September in Fort Smith?
What is the UV index reading in September in Fort Smith?
Average temperature in September
Fort Smith, AR
- Average high temperature in September: 85.1°F
The warmest month (with the highest average high temperature) is July (93.4°F).
The month with the lowest average high temperature is January (48°F).
- Average low temperature in September: 63°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 (31.5°F).
Average pressure in September
Fort Smith, AR
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Fort Smith, AR
- Average wind speed in September: 5.2mph
The windiest month (with the highest average wind speed) is April (7.6mph).
The calmest months (with the lowest average wind speed) are July and August (4.7mph).
Average humidity in September
Fort Smith, AR
- Average humidity in September: 71%
The months with the highest relative humidity are March and May (77%).
The months with the lowest relative humidity are July and August (70%).
Average rainfall in September
Fort Smith, AR
- Average rainfall in September: 1.93"
The wettest month (with the highest rainfall) is May (3.43").
The driest month (with the least rainfall) is February (1.34").
Average rainfall days in September
Fort Smith, AR
- Average rainfall days in September: 10.6 days
The month with the highest number of rainy days is April (14 days).
The month with the least rainy days is November (7.6 days).
Average snowfall in September
Fort Smith, AR
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.31").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").
Average snowfall days in September
Fort Smith, AR
- 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 and October (0 days).
Average daylight in September /
Average sunshine in September
Fort Smith, AR
- Average daylight in September: 12h and 23min
The month with the longest days is June (Average daylight: 14h and 31min).
The month with the shortest days is December (Average daylight: 9h and 49min).
- Average sunshine in September: 9h and 36min
The month with the most sunshine is July (Average sunshine: 10h and 54min).
The months with the least sunshine are January and December (Average sunshine: 5h and 30min).
Average sunshine days in September
Fort Smith, AR
- Average sunshine days in September: 17.3 days
The month with the most sunshine days is January (21.4 days).
The month with the least sunshine days is April (14.2 days).
Average UV index in September
Fort Smith, AR
- Average UV index in September: 5
The months with the highest UV index are June and July (UV index 7).
The month with the lowest UV index is December (UV index 2).
Average cloud cover in September
Fort Smith, AR
- Average cloud cover in September: 26
The month with the most cloud cover is February (Cloud cover 44).
The month with the least cloud cover is August (Cloud cover 24).
Average visibility in September
Fort Smith, AR
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is May (5mi).
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