Average Weather in August in Fort Smith Arkansas, United States
Daily high temperatures decrease by 3°F, from 93°F to 91°F, rarely falling below 82°F or exceeding 101°F.
Daily low temperatures decrease by 3°F, from 73°F to 69°F, rarely falling below 62°F or exceeding 78°F.
For reference, on July 26, the hottest day of the year, temperatures in Fort Smith typically range from 73°F to 94°F, while on January 7, the coldest day of the year, they range from 31°F to 50°F.
Average High and Low Temperature in August
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on August. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.
Average Hourly Temperature in August
’Aïn el Bell, Algeria (5,275 miles away); Kafr Takhārīm, Syria (6,582 miles); and Shahrisabz, Uzbekistan (7,163 miles) are the far-away foreign places with temperatures most similar to Fort Smith (view comparison).
The month of August in Fort Smith experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 31% throughout the month.
The clearest day of the month is August 2, with clear, mostly clear, or partly cloudy conditions 70% of the time.
For reference, on February 16, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 48%, while on October 5, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 71%.
Cloud Cover Categories in August
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Fort Smith, the chance of a wet day over the course of August is essentially constant, remaining around 27% throughout.
For reference, the year's highest daily chance of a wet day is 43% on May 21, and its lowest chance is 17% on January 12.
Probability of Precipitation in August
The average sliding 31-day rainfall during August in Fort Smith is gradually increasing, starting the month at 2.7 inches, when it rarely exceeds 5.0 inches or falls below 0.8 inches, and ending the month at 3.2 inches, when it rarely exceeds 5.8 inches or falls below 1.0 inches.
The lowest average 31-day accumulation is 2.7 inches on August 4.
Average Monthly Rainfall in August
Over the course of August in Fort Smith, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 58 minutes, implying an average daily decrease of 1 minute, 56 seconds, and weekly decrease of 13 minutes, 33 seconds.
The shortest day of the month is August 31, with 12 hours, 57 minutes of daylight and the longest day is August 1, with 13 hours, 55 minutes of daylight.
Hours of Daylight and Twilight in August
The earliest sunrise of the month in Fort Smith is 6:26 AM on August 1 and the latest sunrise is 23 minutes later at 6:49 AM on August 31.
The latest sunset is 8:21 PM on August 1 and the earliest sunset is 35 minutes earlier at 7:45 PM on August 31.
Daylight saving time is observed in Fort Smith during 2018, but it neither starts nor ends during August, so the entire month is in daylight saving time.
For reference, on June 21, the longest day of the year, the Sun rises at 6:02 AM and sets 14 hours, 33 minutes later, at 8:35 PM, while on December 21, the shortest day of the year, it rises at 7:22 AM and sets 9 hours, 46 minutes later, at 5:08 PM.
Sunrise & Sunset with Twilight in August
The chance that a given day will be muggy in Fort Smith is rapidly decreasing during August, falling from 82% to 65% over the course of the month.
For reference, on July 22, the muggiest day of the year, there are muggy conditions 85% of the time, while on January 12, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in August
The average hourly wind speed in Fort Smith is essentially constant during August, remaining within 0.2 miles per hour of 5.0 miles per hour throughout.
For reference, on April 1, the windiest day of the year, the daily average wind speed is 7.9 miles per hour, while on August 3, the calmest day of the year, the daily average wind speed is 4.8 miles per hour.
The lowest daily average wind speed during August is 4.8 miles per hour on August 3.
Average Wind Speed in August
Wind Direction in August
The growing season in Fort Smith typically lasts for 7.5 months (230 days), from around March 24 to around November 9, rarely starting before March 2 or after April 15, and rarely ending before October 21 or after November 29.
The month of August in Fort Smith is reliably fully within the growing season.
Time Spent in Various Temperature Bands and the Growing Season in August
The average accumulated growing degree days in Fort Smith are rapidly increasing during August, increasing by 875°F, from 3,042°F to 3,917°F, over the course of the month.
Growing Degree Days in August
The average daily incident shortwave solar energy in Fort Smith is gradually decreasing during August, falling by 0.8 kWh, from 6.7 kWh to 5.9 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in August
For the purposes of this report, the geographical coordinates of Fort Smith are 35.386 deg latitude, -94.399 deg longitude, and 436 ft elevation.
The topography within 2 miles of Fort Smith contains only modest variations in elevation, with a maximum elevation change of 233 feet and an average elevation above sea level of 459 feet. Within 10 miles contains only modest variations in elevation (748 feet). Within 50 miles contains significant variations in elevation (2,418 feet).
The area within 2 miles of Fort Smith is covered by artificial surfaces (100%), within 10 miles by cropland (47%) and artificial surfaces (26%), and within 50 miles by trees (57%) and cropland (37%).
This report illustrates the typical weather in Fort Smith year round, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Temperature and Dew Point
There are 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Fort Smith.
For each station, the records are corrected for the elevation difference between that station and Fort Smith according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
The estimated value at Fort Smith is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Fort Smith and a given station.
The stations contributing to this reconstruction are: Fort Smith Municipal Airport (91%, 7 kilometers, southeast); Sallisaw Municipal Airport (7%, 37 kilometers, west); and Drake Field (2.4%, 73 kilometers, north).
Time zones for aiports and weather stations are provided by AskGeo.com .