Harman US

Decatur, MI Weather & Growing Conditions

This Afternoon
73°F
Patchy Fog
A chance of rain showers and patchy fog before 5pm, then patchy fog and showers and thunderstorms likely. Cloudy, with a high near 73. Southeast wind around 7 mph. Chance of precipitation is 60%. New rainfall amounts less than a tenth of an inch possible.

7-day forecast

WhenTempForecastWindPrecip
This Afternoon 73°F Patchy Fog 7 mph SE 55%
Tonight 61°F Patchy Fog 5 mph ESE 86%
Sunday 70°F Patchy Fog 3 to 12 mph NNE 70%
Sunday Night 48°F Mostly Cloudy 10 mph NE 14%
Monday 65°F Chance Rain Showers 12 mph ENE 25%
Monday Night 46°F Mostly Cloudy 8 to 12 mph ENE 13%
Tuesday 64°F Mostly Cloudy 9 to 13 mph ENE 13%
Tuesday Night 48°F Mostly Cloudy then Slight Chance Rain Showers 8 to 13 mph ENE 16%
Wednesday 64°F Chance Rain Showers 12 mph ENE 32%
Wednesday Night 48°F Chance Rain Showers then Mostly Cloudy 5 to 10 mph NE 32%
Thursday 68°F Partly Sunny 5 to 8 mph ENE 6%
Thursday Night 49°F Mostly Cloudy 1 to 8 mph ENE 6%
Friday 72°F Partly Sunny 2 to 7 mph NE 3%
Friday Night 48°F Partly Cloudy 1 to 6 mph NE 3%

Forecast source: National Weather Service (api.weather.gov). Updated through the day.

Growing snapshot for Decatur, MI

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

Explore more for Decatur, MI: full frost dates · planting calendar · Michigan frost dates

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