Knoxville, IA Weather & Growing Conditions
This Afternoon
70°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Mostly cloudy. High near 70, with temperatures falling to around 64 in the afternoon. South wind around 8 mph. Chance of precipitation is 40%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 70°F | Chance Showers And Thunderstorms | 8 mph S | 41% |
| Tonight | 48°F | Chance Rain Showers | 8 to 13 mph WSW | 53% |
| Wednesday | 53°F | Mostly Cloudy then Slight Chance Rain Showers | 13 to 16 mph W | 18% |
| Wednesday Night | 45°F | Mostly Cloudy | 12 mph W | 8% |
| Thursday | 53°F | Chance Rain Showers | 13 mph WNW | 43% |
| Thursday Night | 43°F | Slight Chance Rain Showers then Mostly Cloudy | 9 mph NNW | 17% |
| Friday | 52°F | Partly Sunny | 5 to 9 mph N | 5% |
| Friday Night | 36°F | Mostly Cloudy | 3 mph NNW | 0% |
| Saturday | 56°F | Partly Sunny | 1 to 5 mph WSW | 3% |
| Saturday Night | 39°F | Mostly Clear | 5 mph W | 4% |
| Sunday | 62°F | Sunny | 7 mph W | 5% |
| Sunday Night | 40°F | Mostly Clear | 6 mph SW | 2% |
| Monday | 66°F | Sunny | 6 to 10 mph SW | 0% |
| Monday Night | 42°F | Mostly Clear | 6 mph W | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Knoxville, IA
Last spring frost
Apr 20
First fall frost
Oct 19
Growing season
180 days
Hardiness zone
5b
Explore more for Knoxville, IA: full frost dates · planting calendar · Iowa frost dates
Climate data from the nearest NOAA station, Knoxville, Ia (1.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.