Harman US

Decatur, MI Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Decatur, a village in Van Buren County, Michigan.

Tonight
55°F
Mostly Cloudy then Showers And Thunderstorms Likely
A chance of rain showers between 2am and 5am, then showers and thunderstorms likely. Mostly cloudy. Low around 55, with temperatures rising to around 58 overnight. East wind 6 to 9 mph, with gusts as high as 22 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch possible.

7-day forecast for Decatur

WhenTempForecastWindPrecip
Tonight 55°F Mostly Cloudy then Showers And Thunderstorms Likely 6 to 9 mph E 65%
Saturday 73°F Showers And Thunderstorms 10 mph SE 96%
Saturday Night 59°F Showers And Thunderstorms 3 to 7 mph SSE 87%
Sunday 70°F Rain Showers Likely 5 to 12 mph NE 69%
Sunday Night 49°F Chance Rain Showers 8 to 13 mph NE 52%
Monday 65°F Chance Rain Showers 13 mph ENE 35%
Monday Night 46°F Chance Rain Showers then Mostly Cloudy 9 to 14 mph ENE 32%
Tuesday 65°F Partly Sunny then Chance Rain Showers 9 to 13 mph ENE 26%
Tuesday Night 47°F Chance Rain Showers 6 to 13 mph NE 26%
Wednesday 65°F Slight Chance Rain Showers then Partly Sunny 7 to 10 mph NE 17%
Wednesday Night 48°F Mostly Cloudy 3 to 10 mph NE 9%
Thursday 68°F Partly Sunny 3 to 8 mph NNE 5%
Thursday Night 49°F Mostly Cloudy 1 to 8 mph NNE 5%
Friday 71°F Mostly Sunny 2 to 7 mph NNE 7%

Forecast source: National Weather Service (api.weather.gov) for Decatur (42.108, -85.975). Updated through the day.

Growing snapshot for Decatur

Last spring frost
May 4
First fall frost
Oct 11
Growing season
158 days
Hardiness zone
6a

More local growing data for Decatur: nearby ZIP 49045 weather · frost dates · planting calendar · Michigan frost dates

Nearby towns & communities

All Michigan locations ›

Climate data from the nearest NOAA station, Dowagiac 1 W, Mi (10.5 mi from Decatur). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.