Fort Smith
Arkansas, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Fort Smith, AR

The first month of the autumn, September, is also a moderately hot month in Fort Smith, Arkansas, with temperature in the range of an average low of 62.2°F (16.8°C) and an average high of 85.5°F (29.7°C).

Temperature

In Fort Smith, the average high-temperature slightly decreases, from a tropical 93.4°F (34.1°C) in August, to a warm 85.5°F (29.7°C). In September, the average low-temperature is 62.2°F (16.8°C).

Humidity

September is the most humid month, with an average relative humidity of 71.8%.

Rainfall

In Fort Smith, in September, it is raining for 7.7 days, with typically 4.1" (102.9mm) of accumulated precipitation. In Fort Smith, during the entire year, the rain falls for 98.2 days and collects up to 45.5" (1154.7mm) of precipitation.

Snowfall

Throughout the year, 4.9" (124.4mm) of snow is accumulated.

Daylight

The average length of the day in September is 12.4h.

Sunshine

The average sunshine in Fort Smith is 7.8h.

UV index

In Fort Smith, the average daily maximum UV index is 8. A UV Index reading of 8 to 10 represents a very high health risk from unsafe exposure to the UV radiation for average individuals.
In September, the average maximum UV index of 8 translate into the following recommendations:
Take extra precautions. Fair-skinned individuals may get burned in less than 10 minutes. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.

What is the temperature in September in Fort Smith?

In Fort Smith, in September, the average high-temperature is 85.5°F (29.7°C), and the average low-temperature is 62.2°F (16.8°C).

What is the most humid month in Fort Smith?

The most humid month is September, with an average relative humidity of 71.8%.

What is the average humidity in September in Fort Smith?

In Fort Smith, the average relative humidity in September is 71.8%.

How much does it rain in Fort Smith in September?

In September, in Fort Smith, Arkansas, the rain falls for 7.7 days. Throughout September, 4.1" (102.9mm) of precipitation is accumulated.

How many hours of daylight does Fort Smith have in September?

In September, the average length of the day in Fort Smith, Arkansas, is 12.4h.

How many hours of sunshine does Fort Smith have in September?

In Fort Smith, Arkansas, the average sunshine in September is 7.8h.

How high is the UV index in September in Fort Smith?

In September, the average daily maximum UV index in Fort Smith, Arkansas, is 8. A UV Index value of 8 to 10 symbolizes a very high health threat from the exposure to the Sun's UV radiation.
Average temperature in September - Fort Smith, AR
  • Average high temperature in September: 85.4°F

The warmest month (with the highest average high temperature) is August (93.4°F).
The month with the lowest average high temperature is January (49.9°F).

  • Average low temperature in September: 62.3°F

The month with the highest average low temperature is July (71.6°F).
The coldest month (with the lowest average low temperature) is January (29°F).

Average humidity in September - Fort Smith, AR
  • Average humidity in September: 71.8%

The month with the highest relative humidity is September (71.8%).
The month with the lowest relative humidity is April (63.8%).

Average rainfall in September - Fort Smith, AR
  • Average rainfall in September: 4.1"

The wettest month (with the highest rainfall) is May (5.5").
The driest month (with the lowest rainfall) is August (2.6").

Average rainfall days in September - Fort Smith, AR
  • Average rainfall days in September: 7.7 days

The month with the highest number of rainy days is May (10.7 days).
The month with the lowest number of rainy days is August (6.3 days).

Average snowfall in September - Fort Smith, AR
  • Average snowfall in September: 0"

The month with the highest snowfall is January (2.4").
Months with the lowest 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 January (1.1 days).
Months with the lowest number of snowfall days are April, May, June, July, August, September, October and November (0 days).

Average daylight in September / Average sunshine in September - Fort Smith, AR
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.5h).
The month with shortest days is December (Average daylight: 9.8h).

  • Average sunshine in September: 7.8h

The month with most sunshine is July (Average sunshine: 10.6h).
The month with least sunshine is December (Average sunshine: 5h).

Average UV index in September - Fort Smith, AR
  • Average UV index in September: 8

Months with the highest UV index are June and July (UV index 10).
The month with the lowest UV index is December (UV index 2).