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Ionia, MI Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Ionia, a city in Ionia County, Michigan.

Overnight
51°F
Rain Showers Likely
Rain showers likely. Mostly cloudy. Low around 51, with temperatures rising to around 54 overnight. East wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch possible.

7-day forecast for Ionia

WhenTempForecastWindPrecip
Overnight 51°F Rain Showers Likely 10 mph E 63%
Saturday 65°F Showers And Thunderstorms 7 to 10 mph E 92%
Saturday Night 55°F Showers And Thunderstorms 6 to 9 mph ENE 82%
Sunday 67°F Rain Showers Likely 9 to 14 mph NE 56%
Sunday Night 49°F Chance Rain Showers then Mostly Cloudy 13 mph NE 32%
Monday 63°F Mostly Cloudy 15 mph ENE 11%
Monday Night 45°F Mostly Cloudy 13 to 16 mph ENE 11%
Tuesday 62°F Partly Sunny 16 mph NE 14%
Tuesday Night 47°F Chance Rain Showers 12 to 16 mph NE 29%
Wednesday 63°F Chance Rain Showers 13 mph NE 29%
Wednesday Night 48°F Slight Chance Rain Showers then Mostly Cloudy 6 to 13 mph NE 19%
Thursday 66°F Partly Sunny 7 to 10 mph NE 5%
Thursday Night 48°F Mostly Cloudy 3 to 8 mph NNE 4%
Friday 70°F Mostly Sunny 5 to 8 mph NNE 7%

Forecast source: National Weather Service (api.weather.gov) for Ionia (42.977, -85.075). Updated through the day.

Growing snapshot for Ionia

Last spring frost
May 3
First fall frost
Oct 12
Growing season
161 days
Hardiness zone
6a

More local growing data for Ionia: nearby ZIP 48846 weather · frost dates · planting calendar · Michigan frost dates

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Climate data from the nearest NOAA station, Ionia 2Ssw, Mi (2.5 mi from Ionia). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.