Chillicothe, IA Weather & Growing Conditions
Overnight
70°F
Patchy Fog
Patchy fog between 3am and 4am, then patchy fog and a slight chance of showers and thunderstorms between 4am and 5am, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 70. South southeast wind around 6 mph. Chance of precipitation is 30%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 70°F | Patchy Fog | 6 mph SSE | 25% |
| Saturday | 86°F | Chance Showers And Thunderstorms | 6 to 9 mph SSW | 43% |
| Saturday Night | 65°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 6 mph NNW | 69% |
| Sunday | 71°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 6 to 10 mph NNE | 69% |
| Sunday Night | 59°F | Slight Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 10 mph NE | 65% |
| Monday | 64°F | Rain Showers Likely | 12 mph NE | 65% |
| Monday Night | 53°F | Rain Showers Likely | 6 to 10 mph NE | 55% |
| Tuesday | 62°F | Chance Rain Showers then Partly Sunny | 9 mph NE | 38% |
| Tuesday Night | 48°F | Partly Cloudy | 6 mph NE | 3% |
| Wednesday | 66°F | Sunny | 5 mph NE | 2% |
| Wednesday Night | 52°F | Partly Cloudy | 3 mph ENE | 2% |
| Thursday | 68°F | Partly Sunny | 3 mph ENE | 10% |
| Thursday Night | 56°F | Mostly Cloudy | 2 mph E | 5% |
| Friday | 71°F | Partly Sunny | 5 mph E | 6% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Chillicothe, IA
Last spring frost
Apr 23
First fall frost
Oct 14
Growing season
172 days
Hardiness zone
5b
Explore more for Chillicothe, IA: full frost dates · planting calendar · Iowa frost dates
Climate data from the nearest NOAA station, Ottumwa Industrial Ap, Ia (4.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.