Knoxville, IA Weather & Growing Conditions
Today
86°F
Partly Sunny then Chance Showers And Thunderstorms
A chance of showers and thunderstorms after noon. Partly sunny. High near 86, with temperatures falling to around 84 in the afternoon. West northwest 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 |
|---|---|---|---|---|
| Today | 86°F | Partly Sunny then Chance Showers And Thunderstorms | 8 mph WNW | 32% |
| Tonight | 64°F | Showers And Thunderstorms | 10 mph NNE | 92% |
| Wednesday | 74°F | Showers And Thunderstorms Likely | 8 mph NNE | 92% |
| Wednesday Night | 60°F | Showers And Thunderstorms Likely | 3 to 8 mph NNE | 55% |
| Thursday | 80°F | Mostly Sunny | 5 mph NE | 14% |
| Thursday Night | 62°F | Mostly Clear | 0 to 3 mph ESE | 3% |
| Friday | 85°F | Sunny | 2 to 7 mph S | 6% |
| Friday Night | 67°F | Mostly Clear | 6 mph SSE | 14% |
| Saturday | 89°F | Sunny | 5 to 9 mph S | 10% |
| Saturday Night | 72°F | Mostly Clear | 12 mph SSW | 12% |
| Sunday | 90°F | Mostly Sunny | 13 mph SSW | 12% |
| Sunday Night | 72°F | Slight Chance Showers And Thunderstorms | 12 mph S | 26% |
| Monday | 90°F | Chance Showers And Thunderstorms then Mostly Sunny | 14 mph SSW | 26% |
| Monday Night | 73°F | Chance Showers And Thunderstorms | 14 mph SSE | 26% |
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 Aug 4, 2026.