September weather forecast and climate
Fort Smith, AR

What is the temperature in September in Fort Smith?

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

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.
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).

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