Napoleon, MI Weather & Growing Conditions
Today
68°F
Showers And Thunderstorms
Rain showers before 8am, then showers and thunderstorms between 8am and 5pm, then patchy fog and a chance of showers and thunderstorms. Cloudy. High near 68, with temperatures falling to around 65 in the afternoon. East southeast wind 3 to 8 mph, with gusts as high as 18 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 68°F | Showers And Thunderstorms | 3 to 8 mph ESE | 88% |
| Tonight | 59°F | Patchy Fog | 2 to 8 mph ESE | 91% |
| Sunday | 69°F | Rain Showers Likely then Mostly Cloudy | 3 to 12 mph NNW | 67% |
| Sunday Night | 49°F | Mostly Cloudy | 10 mph NE | 8% |
| Monday | 63°F | Mostly Cloudy | 12 mph NE | 9% |
| Monday Night | 46°F | Mostly Cloudy | 8 to 12 mph NE | 9% |
| Tuesday | 62°F | Partly Sunny | 14 mph NE | 10% |
| Tuesday Night | 48°F | Chance Rain Showers | 13 mph NE | 43% |
| Wednesday | 62°F | Chance Rain Showers | 13 mph NE | 54% |
| Wednesday Night | 49°F | Chance Showers And Thunderstorms | 6 to 12 mph NE | 52% |
| Thursday | 65°F | Mostly Cloudy | 6 to 9 mph NE | 14% |
| Thursday Night | 48°F | Mostly Cloudy | 3 to 9 mph NE | 8% |
| Friday | 69°F | Mostly Sunny | 3 to 8 mph NNE | 7% |
| Friday Night | 47°F | Partly Cloudy | 2 to 7 mph NE | 4% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Napoleon, MI
Last spring frost
Apr 30
First fall frost
Oct 14
Growing season
165 days
Hardiness zone
6a
Explore more for Napoleon, MI: full frost dates · planting calendar · Michigan frost dates
Climate data from the nearest NOAA station, Manchester, Mi (11.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.