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
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| 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.