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Monthly climate in Fort Smith, Arkansas, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Fort Smith features a humid subtropical climate (Cfa).Temperatures typically range between 4 °C (40 °F) and 27 °C (81 °F) through the year, but rarely can drop to -22 °C (-8 °F) or can rise to as high as 40 °C (105 °F).The average annual precipitation amounts to about 1466 mm (57.7 inches) and receives 126 rainy days on the 1 mm (0.04 inches) threshold annually.Fort Smith enjoys an average of 3076 hours of sunshine throughout the year, and daylight varies from 9 hours 47 minutes to 14 hours 29 minutes per day.

Monthly average temperatures in Fort Smith, Arkansas, United States §

The warmest months in Fort Smith are June, July and August, with daily mean temperatures ranging from 25 to 27 °C (78 - 81 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 4 to 7 °C (40 - 46 °F) throughout the day. On average each year, Fort Smith experiences 135 days above 25 °C (77.0 °F) and 45 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Fort Smith, Arkansas, United States.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 23°C
(74°F)		 29°C
(84°F)		 32°C
(91°F)		 32°C
(90°F)		 34°C
(93°F)		 35°C
(96°F)		 40°C
(105°F)		 37°C
(99°F)		 37°C
(99°F)		 33°C
(92°F)		 29°C
(84°F)		 25°C
(77°F)
Mean maximum 20°C
(69°F)		 24°C
(75°F)		 28°C
(82°F)		 29°C
(85°F)		 32°C
(89°F)		 34°C
(93°F)		 37°C
(98°F)		 36°C
(96°F)		 35°C
(95°F)		 32°C
(89°F)		 24°C
(76°F)		 23°C
(74°F)
Average high 10°C
(50°F)		 12°C
(53°F)		 18°C
(65°F)		 21°C
(70°F)		 26°C
(79°F)		 30°C
(87°F)		 32°C
(91°F)		 31°C
(89°F)		 30°C
(86°F)		 23°C
(73°F)		 16°C
(62°F)		 13°C
(55°F)
Daily mean 4°C
(40°F)		 6°C
(43°F)		 12°C
(54°F)		 15°C
(60°F)		 21°C
(70°F)		 25°C
(78°F)		 27°C
(81°F)		 26°C
(79°F)		 24°C
(76°F)		 17°C
(63°F)		 10°C
(50°F)		 7°C
(46°F)
Average low -0°C
(32°F)		 1°C
(34°F)		 7°C
(44°F)		 10°C
(50°F)		 16°C
(61°F)		 20°C
(69°F)		 23°C
(73°F)		 22°C
(71°F)		 19°C
(66°F)		 12°C
(53°F)		 4°C
(40°F)		 3°C
(37°F)
Mean minimum -10°C
(15°F)		 -10°C
(14°F)		 -3°C
(27°F)		 0°C
(32°F)		 8°C
(47°F)		 15°C
(60°F)		 19°C
(66°F)		 18°C
(65°F)		 11°C
(53°F)		 2°C
(36°F)		 -3°C
(26°F)		 -5°C
(23°F)
Minimum -16°C
(4°F)		 -22°C
(-8°F)		 -10°C
(15°F)		 -2°C
(29°F)		 6°C
(42°F)		 13°C
(55°F)		 17°C
(62°F)		 16°C
(61°F)		 8°C
(47°F)		 -1°C
(30°F)		 -8°C
(18°F)		 -8°C
(19°F)

Compare climate in Fort Smith with other places

Compare temperature, precipitation, sunshine, UV index in Fort Smith, Arkansas, United States with other places around the world.

Monthly average precipitation in Fort Smith, Arkansas, United States §

Fort Smith usually has the most precipitation in April, May and October, with an average of 11 rainy days and 173 mm (6.8 inches) of precipitation per month.The driest months in Fort Smith are June, September and November. On average, 85 mm (3.4 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Fort Smith, Arkansas, United States.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average precipitation mm (inches) 98 (3.9) 123 (4.8) 141 (5.6) 157 (6.2) 213 (8.4) 91 (3.6) 98 (3.8) 132 (5.2) 78 (3.1) 151 (5.9) 87 (3.4) 98 (3.9)
Average precipitation days (≥ 1 mm) 9 12 15 11 14 10 10 12 6 10 9 8

Monthly sunshine hours in Fort Smith, Arkansas, United States §

The sunniest months in Fort Smith are June, July and August, when the sun shines an average of 10 hours 53 minutes a day.Least sunny months in Fort Smith: January, February and March receive an average of 6 hours 2 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Fort Smith, Arkansas, United States.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 156 173 218 246 290 332 351 317 294 250 222 220
Mean daily daylight hours 10h 3m 10h 54m 11h 59m 13h 6m 14h 2m 14h 29m 14h 14m 13h 24m 12h 20m 11h 14m 10h 16m 9h 47m

Solar UV radiation in Fort Smith, Arkansas, United States §

Fort Smith experiences the highest level of ultraviolet (UV) radiation in May, June and July, when the maximum UV index can reach values of 11 - 11, which corresponds to the Extreme category of sun exposure.January, November and December are in the Moderate exposure category. In these months, the maximum values of the UV index do not exceed 5. For more detailed information, check out our hourly Fort Smith UV Index data.

Average daily maximum UV levels by month for Fort Smith, Arkansas, United States.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 4 6 7 10 11 11 11 10 9 7 5 4