Ionia, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Ionia, a city in Chickasaw County, Iowa.
Today
74°F
Scattered Showers And Thunderstorms
Isolated rain showers before 2pm, then scattered showers and thunderstorms between 2pm and 4pm, then scattered showers and thunderstorms. Mostly cloudy. High near 74, with temperatures falling to around 70 in the afternoon. West wind around 9 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Ionia
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 74°F | Scattered Showers And Thunderstorms | 9 mph W | 52% |
| Tonight | 59°F | Chance Showers And Thunderstorms then Scattered Showers And Thunderstorms | 5 to 8 mph NW | 61% |
| Wednesday | 74°F | Partly Sunny | 6 mph N | 11% |
| Wednesday Night | 54°F | Mostly Clear | 5 mph N | 2% |
| Thursday | 77°F | Sunny | 1 to 5 mph E | 0% |
| Thursday Night | 59°F | Mostly Clear | 5 mph S | 1% |
| Friday | 80°F | Sunny | 3 to 12 mph S | 8% |
| Friday Night | 64°F | Mostly Clear | 9 mph S | 11% |
| Saturday | 82°F | Sunny | 6 to 10 mph S | 9% |
| Saturday Night | 68°F | Chance Rain Showers | 13 mph S | 32% |
| Sunday | 83°F | Chance Showers And Thunderstorms | 12 mph SE | 32% |
| Sunday Night | 67°F | Slight Chance Showers And Thunderstorms | 9 mph S | 35% |
| Monday | 82°F | Chance Showers And Thunderstorms | 9 to 13 mph SE | 35% |
| Monday Night | 67°F | Slight Chance Showers And Thunderstorms | 8 to 12 mph E | 38% |
Forecast source: National Weather Service (api.weather.gov) for Ionia (43.036, -92.458). Updated through the day.
Growing snapshot for Ionia
Last spring frost
May 2
First fall frost
Oct 5
Growing season
155 days
Hardiness zone
5a
More local growing data for Ionia: nearby ZIP 50645 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, New Hampton, Ia (6.9 mi from Ionia). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.