Napoleon, MI Weather & Growing Conditions
Tonight
47°F
Rain Showers then Mostly Cloudy
Rain showers before 8pm. Mostly cloudy. Low around 47, with temperatures rising to around 49 overnight. Southwest wind 8 to 13 mph, with gusts as high as 24 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 47°F | Rain Showers then Mostly Cloudy | 8 to 13 mph SW | 83% |
| Thursday | 59°F | Chance Rain Showers | 9 to 15 mph SW | 29% |
| Thursday Night | 37°F | Rain Showers Likely | 9 mph W | 67% |
| Friday | 51°F | Chance Rain Showers | 8 to 13 mph NW | 25% |
| Friday Night | 30°F | Chance Rain Showers | 10 mph NW | 25% |
| Saturday | 51°F | Partly Sunny | 8 to 12 mph NW | 3% |
| Saturday Night | 27°F | Partly Cloudy | 6 mph WNW | 0% |
| Sunday | 58°F | Mostly Sunny | 5 to 13 mph W | 4% |
| Sunday Night | 30°F | Mostly Clear | 5 to 10 mph WNW | 4% |
| Monday | 59°F | Sunny | 5 to 10 mph W | 1% |
| Monday Night | 36°F | Mostly Clear | 9 mph WSW | 0% |
| Tuesday | 61°F | Sunny | 7 to 10 mph W | 0% |
| Tuesday Night | 32°F | Partly Cloudy | 2 to 6 mph WNW | 1% |
| Veterans Day | 58°F | Mostly Sunny | 1 to 7 mph NW | 2% |
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 (8.1 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 5, 2026.