Defiance, IA Weather & Growing Conditions
Today
76°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 4pm, then a chance of showers and thunderstorms between 4pm and 5pm, then showers and thunderstorms likely. Mostly cloudy. High near 76, with temperatures falling to around 73 in the afternoon. North northeast wind 8 to 12 mph, with gusts as high as 18 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 76°F | Chance Showers And Thunderstorms | 8 to 12 mph NNE | 66% |
| Tonight | 58°F | Chance Showers And Thunderstorms then Patchy Smoke | 2 to 9 mph NE | 82% |
| Wednesday | 72°F | Patchy Smoke | 2 to 6 mph ENE | 44% |
| Wednesday Night | 53°F | Mostly Clear | 0 to 3 mph ENE | 3% |
| Thursday | 79°F | Sunny | 0 to 5 mph ESE | 1% |
| Thursday Night | 60°F | Mostly Clear | 3 mph SSE | 2% |
| Friday | 84°F | Sunny | 2 to 8 mph S | 3% |
| Friday Night | 65°F | Mostly Clear | 7 mph S | 9% |
| Saturday | 88°F | Sunny | 3 to 13 mph S | 4% |
| Saturday Night | 69°F | Mostly Clear | 10 to 14 mph S | 13% |
| Sunday | 88°F | Mostly Sunny | 8 to 12 mph SSE | 13% |
| Sunday Night | 69°F | Chance Showers And Thunderstorms | 13 mph SSE | 26% |
| Monday | 88°F | Chance Showers And Thunderstorms then Partly Sunny | 14 mph S | 26% |
| Monday Night | 70°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 9 to 15 mph ESE | 21% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Defiance, IA
Last spring frost
Apr 27
First fall frost
Oct 9
Growing season
165 days
Hardiness zone
5a
Explore more for Defiance, IA: full frost dates · planting calendar · Iowa frost dates
Climate data from the nearest NOAA station, Harlan, Ia (13.4 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.