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Monthly climate in Fort Smith, Canada

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Fort Smith features a subarctic climate (Dfc). Temperatures typically range between -22 °C (-6 °F) and 18 °C (64 °F) through the year, but rarely can drop to -47 °C (-52 °F) or can rise to as high as 40 °C (104 °F). The average annual precipitation amounts to about 434 mm (17.1 inches) and receives 86 rainy days on the 1 mm (0.04 inches) threshold annually. Fort Smith enjoys an average of 2569 hours of sunshine throughout the year, and daylight varies from 5 hours 59 minutes to 18 hours 41 minutes per day.

Monthly average temperatures in Fort Smith, Canada

The warmest months in Fort Smith are June, July and August, with daily mean temperatures ranging from 16 to 18 °C (60 - 64 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -22 to -20 °C (-6 - -3 °F) throughout the day. On average each year, Fort Smith experiences 22 days above 25 °C (77.0 °F) and 201 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. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum1°C
(34°F)		6°C
(43°F)		12°C
(55°F)		19°C
(66°F)		32°C
(90°F)		33°C
(91°F)		40°C
(104°F)		33°C
(93°F)		29°C
(84°F)		19°C
(67°F)		6°C
(43°F)		2°C
(37°F)
Mean maximum-2°C
(29°F)		-0°C
(32°F)		8°C
(46°F)		15°C
(59°F)		26°C
(78°F)		29°C
(84°F)		32°C
(91°F)		30°C
(86°F)		23°C
(73°F)		15°C
(60°F)		0°C
(33°F)		-3°C
(27°F)
Average high-17°C
(2°F)		-16°C
(3°F)		-6°C
(22°F)		3°C
(38°F)		14°C
(58°F)		21°C
(71°F)		23°C
(74°F)		21°C
(70°F)		13°C
(56°F)		4°C
(40°F)		-8°C
(18°F)		-16°C
(3°F)
Daily mean-21°C
(-5°F)		-22°C
(-6°F)		-12°C
(10°F)		-3°C
(27°F)		8°C
(47°F)		16°C
(61°F)		18°C
(64°F)		16°C
(60°F)		9°C
(48°F)		1°C
(34°F)		-11°C
(12°F)		-20°C
(-3°F)
Average low-25°C
(-12°F)		-27°C
(-15°F)		-18°C
(-1°F)		-10°C
(15°F)		2°C
(36°F)		10°C
(50°F)		11°C
(53°F)		10°C
(51°F)		4°C
(39°F)		-2°C
(29°F)		-14°C
(7°F)		-23°C
(-10°F)
Mean minimum-40°C
(-39°F)		-40°C
(-40°F)		-36°C
(-32°F)		-23°C
(-9°F)		-8°C
(18°F)		2°C
(36°F)		5°C
(42°F)		5°C
(41°F)		-3°C
(27°F)		-9°C
(15°F)		-26°C
(-15°F)		-39°C
(-39°F)
Minimum-41°C
(-42°F)		-47°C
(-52°F)		-40°C
(-39°F)		-26°C
(-14°F)		-15°C
(5°F)		0°C
(33°F)		3°C
(38°F)		3°C
(38°F)		-5°C
(23°F)		-13°C
(9°F)		-30°C
(-23°F)		-42°C
(-43°F)

Compare climate in Fort Smith with other places

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

Monthly average precipitation in Fort Smith, Canada

Fort Smith usually has the most precipitation in June, July and August, with an average of 10 rainy days and 68 mm (2.7 inches) of precipitation per month. The driest months in Fort Smith are February, March and April. On average, 15 mm (0.6 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Fort Smith. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)22 (0.8)14 (0.5)14 (0.6)17 (0.7)32 (1.3)66 (2.6)63 (2.5)76 (3.0)48 (1.9)31 (1.2)30 (1.2)20 (0.8)
Average precipitation days (≥ 1 mm)535471011119885

Monthly sunshine hours in Fort Smith, Canada

The sunniest months in Fort Smith are May, June and July, when the sun shines an average of 11 hours 16 minutes a day. Least sunny months in Fort Smith: January, November and December receive an average of 2 hours 49 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Fort Smith. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours771552342673333433602852031258695
Mean daily daylight hours6h 49m9h 10m11h 53m14h 39m17h 13m18h 41m17h 51m15h 28m12h 45m10h 1m7h 27m5h 59m

Solar UV radiation in Fort Smith, Canada

Fort Smith experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 6 - 6, which corresponds to the High category of sun exposure. January, November and December are in the Low exposure category. In these months, the maximum values of the UV index do not exceed 1. For more detailed information, check out our hourly Fort Smith UV Index data.

Average daily maximum UV levels by month for Fort Smith. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)123456664211