Decatur, MI Weather & Growing Conditions
Today
73°F
Patchy Fog
Patchy fog and showers and thunderstorms before 11am, then patchy fog and showers and thunderstorms likely between 11am and 5pm, then patchy fog and showers and thunderstorms likely. Mostly cloudy. High near 73, with temperatures falling to around 70 in the afternoon. Southeast wind 6 to 9 mph, with gusts as high as 22 mph. Chance of precipitation is 80%. New rainfall amounts between three quarters and one inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 73°F | Patchy Fog | 6 to 9 mph SE | 79% |
| Tonight | 61°F | Patchy Fog | 2 to 6 mph S | 86% |
| Sunday | 71°F | Patchy Fog | 3 to 12 mph NNE | 70% |
| Sunday Night | 49°F | Mostly Cloudy | 8 to 12 mph NE | 14% |
| Monday | 65°F | Mostly Cloudy | 12 mph ENE | 13% |
| Monday Night | 45°F | Mostly Cloudy | 8 to 12 mph NE | 9% |
| Tuesday | 64°F | Partly Sunny | 9 to 14 mph NE | 14% |
| Tuesday Night | 47°F | Slight Chance Rain Showers | 7 to 14 mph NE | 18% |
| Wednesday | 65°F | Chance Rain Showers | 10 mph NE | 31% |
| Wednesday Night | 48°F | Slight Chance Rain Showers then Mostly Cloudy | 5 to 12 mph NE | 15% |
| Thursday | 68°F | Partly Sunny | 5 to 9 mph NE | 3% |
| Thursday Night | 48°F | Mostly Cloudy | 2 to 8 mph NE | 3% |
| Friday | 72°F | Mostly Sunny | 3 to 8 mph NE | 3% |
| Friday Night | 48°F | Partly Cloudy | 2 to 7 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.