Knoxville, IA Weather & Growing Conditions
Overnight
70°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Mostly cloudy, with a low around 70. South southeast wind around 8 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 70°F | Chance Showers And Thunderstorms | 8 mph SSE | 28% |
| Saturday | 82°F | Chance Showers And Thunderstorms | 10 mph SW | 50% |
| Saturday Night | 63°F | Showers And Thunderstorms Likely | 8 mph NNW | 67% |
| Sunday | 66°F | Chance Rain Showers then Chance Showers And Thunderstorms | 9 to 13 mph NNE | 48% |
| Sunday Night | 57°F | Slight Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 13 mph NE | 62% |
| Monday | 61°F | Rain Showers Likely | 13 mph NE | 62% |
| Monday Night | 52°F | Rain Showers Likely | 12 mph NE | 60% |
| Tuesday | 59°F | Slight Chance Rain Showers then Partly Sunny | 10 mph NE | 19% |
| Tuesday Night | 48°F | Partly Cloudy | 3 to 8 mph NE | 3% |
| Wednesday | 64°F | Sunny | 6 mph ENE | 1% |
| Wednesday Night | 52°F | Partly Cloudy | 5 mph E | 4% |
| Thursday | 65°F | Slight Chance Rain Showers | 5 mph E | 18% |
| Thursday Night | 56°F | Mostly Cloudy | 3 mph E | 7% |
| Friday | 67°F | Partly Sunny | 2 to 6 mph E | 7% |
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 Sep 19, 2026.