Defiance, IA Weather & Growing Conditions
Today
76°F
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms before 4pm. Mostly cloudy. High near 76, with temperatures falling to around 74 in the afternoon. North northwest wind 3 to 7 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 76°F | Slight Chance Showers And Thunderstorms | 3 to 7 mph NNW | 19% |
| Tonight | 58°F | Chance Rain Showers | 8 mph N | 27% |
| Sunday | 63°F | Chance Rain Showers | 8 to 12 mph NE | 35% |
| Sunday Night | 54°F | Chance Rain Showers | 7 to 10 mph NE | 43% |
| Monday | 58°F | Rain Showers Likely | 9 mph ENE | 59% |
| Monday Night | 49°F | Chance Rain Showers then Mostly Cloudy | 3 to 8 mph ENE | 47% |
| Tuesday | 60°F | Partly Sunny | 3 to 7 mph ENE | 6% |
| Tuesday Night | 45°F | Partly Cloudy | 1 to 5 mph E | 1% |
| Wednesday | 63°F | Mostly Sunny | 1 to 5 mph SE | 2% |
| Wednesday Night | 50°F | Partly Cloudy then Slight Chance Rain Showers | 3 mph SE | 18% |
| Thursday | 65°F | Slight Chance Rain Showers | 1 to 6 mph SE | 23% |
| Thursday Night | 54°F | Mostly Cloudy then Slight Chance Rain Showers | 3 mph SE | 18% |
| Friday | 67°F | Slight Chance Rain Showers then Mostly Cloudy | 2 to 7 mph SE | 18% |
| Friday Night | 55°F | Mostly Cloudy then Slight Chance Rain Showers | 5 mph SE | 18% |
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 Sep 19, 2026.