Today | Weather | Monday, September 21, 2026

Weather in Fort Smith, Arkansas

11:59 AM
Now
Sunny Weather
86° F
Feels Like 95°
Precipitation 4 %
Wind 7 mph
UV Index (0 - 11+) 5
Humidity 59 %
Today
Sunny with a Chance of Thunderstorms
Day 91°
Night 72°
Precipitation 55 %
Wind 7 mph
UV Index (0 - 11+) 6

Fort Smith Weather Forecast Updated

47 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (September 21, 2025)
Stormy Weather

Day

88°

Night

72°

Wind

7 mph

Precipitation

100 %

Air Quality in Fort Smith

NOW
45 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 4.36 µg/m³
PM10 5.63 µg/m³
O3 0.048 ppm
NO2 0.3 ppb
SO2 0.1 ppb
CO 0.09 ppm
NH3 0.25 µg/m³
NO 0.1 µg/m³
PM2.5 – Fine particles <2.5μm
PM10 – Inhalable particles <10μm
O3 – Ozone
NO2 – Nitrogen dioxide
SO2 – Sulfur dioxide
CO – Carbon monoxide
NH3 – Ammonia
NO – Nitric oxide

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

Show raw pollutant concentrations (µg/m³)
PM2.54.36 µg/m³
PM105.63 µg/m³
O394.67 µg/m³
NO20.62 µg/m³
SO20.34 µg/m³
CO106.7 µg/m³
NH30.25 µg/m³
NO0.1 µg/m³