Ionia, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Ionia, a city in Chickasaw County, Iowa.
This Afternoon
66°F
Rain Showers Likely
Rain showers likely. Cloudy. High near 66, with temperatures falling to around 61 in the afternoon. Northwest wind around 6 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Ionia
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 66°F | Rain Showers Likely | 6 mph NW | 60% |
| Tonight | 48°F | Showers And Thunderstorms | 7 to 12 mph E | 79% |
| Wednesday | 52°F | Rain Showers Likely | 12 to 16 mph SW | 65% |
| Wednesday Night | 43°F | Rain Showers | 15 mph W | 77% |
| Thursday | 50°F | Rain Showers Likely | 14 mph NW | 72% |
| Thursday Night | 37°F | Mostly Cloudy | 9 to 13 mph N | 11% |
| Friday | 47°F | Partly Sunny | 5 to 10 mph N | 0% |
| Friday Night | 31°F | Partly Cloudy | 3 mph NW | 0% |
| Saturday | 52°F | Mostly Sunny | 1 to 6 mph SW | 2% |
| Saturday Night | 35°F | Mostly Clear | 6 mph W | 5% |
| Sunday | 57°F | Sunny | 6 to 9 mph W | 9% |
| Sunday Night | 37°F | Mostly Clear | 7 mph SW | 1% |
| Monday | 59°F | Mostly Sunny | 7 to 13 mph SW | 0% |
| Monday Night | 40°F | Mostly Clear | 7 mph W | 0% |
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 Nov 4, 2026.