Knoxville, AR Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Knoxville, a town in Johnson County, Arkansas.
This Afternoon
100°F
Sunny
Sunny, with a high near 100. Heat index values as high as 104. South southeast wind around 5 mph.
7-day forecast for Knoxville
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 100°F | Sunny | 5 mph SSE | 0% |
| Tonight | 72°F | Clear | 0 to 5 mph SE | 0% |
| Saturday | 101°F | Sunny | 0 to 5 mph SSE | 0% |
| Saturday Night | 71°F | Mostly Clear | 0 to 5 mph SE | 0% |
| Sunday | 100°F | Sunny | 0 to 5 mph S | 0% |
| Sunday Night | 72°F | Mostly Cloudy | 0 to 5 mph E | 11% |
| Monday | 94°F | Chance Showers And Thunderstorms | 0 to 5 mph NW | 31% |
| Monday Night | 68°F | Chance Showers And Thunderstorms then Partly Cloudy | 5 mph N | 31% |
| Tuesday | 90°F | Mostly Sunny | 5 mph NNE | 13% |
| Tuesday Night | 64°F | Partly Cloudy | 5 to 10 mph NE | 6% |
| Wednesday | 88°F | Sunny | 5 mph NE | 5% |
| Wednesday Night | 62°F | Mostly Clear | 5 mph ENE | 5% |
| Thursday | 88°F | Sunny | 5 mph ENE | 3% |
| Thursday Night | 63°F | Mostly Clear | 5 mph NE | 3% |
Forecast source: National Weather Service (api.weather.gov) for Knoxville (35.378, -93.362). Updated through the day.
Growing snapshot for Knoxville
Last spring frost
Mar 24
First fall frost
Nov 10
Growing season
233 days
Hardiness zone
8a
More local growing data for Knoxville: nearby ZIP 72845 weather · frost dates · planting calendar · Arkansas frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Clarksville 2N, Ar (10.9 mi from Knoxville). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 18, 2026.