Napoleon, MI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Napoleon, a community in Jackson County, Michigan.
This Afternoon
75°F
Mostly Sunny
Mostly sunny. High near 75, with temperatures falling to around 73 in the afternoon. South wind around 15 mph, with gusts as high as 26 mph.
7-day forecast for Napoleon
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 75°F | Mostly Sunny | 15 mph S | 3% |
| Tonight | 61°F | Partly Cloudy then Slight Chance Rain Showers | 13 mph SSE | 17% |
| Wednesday | 69°F | Rain Showers | 12 to 16 mph S | 83% |
| Wednesday Night | 48°F | Chance Rain Showers then Mostly Cloudy | 7 to 12 mph SW | 37% |
| Thursday | 61°F | Mostly Cloudy | 9 to 15 mph SW | 13% |
| Thursday Night | 43°F | Mostly Cloudy then Chance Rain Showers | 2 to 8 mph W | 29% |
| Friday | 55°F | Chance Rain Showers | 2 to 9 mph NW | 44% |
| Friday Night | 33°F | Chance Rain Showers | 8 mph NNW | 36% |
| Saturday | 52°F | Partly Sunny | 8 mph NW | 14% |
| Saturday Night | 30°F | Partly Cloudy | 5 mph W | 6% |
| Sunday | 56°F | Mostly Sunny then Slight Chance Rain Showers | 2 to 10 mph W | 16% |
| Sunday Night | 31°F | Slight Chance Rain Showers then Partly Cloudy | 5 to 9 mph WNW | 16% |
| Monday | 59°F | Mostly Sunny | 6 to 12 mph W | 13% |
| Monday Night | 36°F | Partly Cloudy | 9 mph WSW | 10% |
Forecast source: National Weather Service (api.weather.gov) for Napoleon (42.165, -84.244). Updated through the day.
Growing snapshot for Napoleon
Last spring frost
Apr 30
First fall frost
Oct 14
Growing season
165 days
Hardiness zone
6a
More local growing data for Napoleon: nearby ZIP 49261 weather · frost dates · planting calendar · Michigan frost dates
Nearby towns & communities
Brooklyn
Cement City
Concord
Grass Lake
Hanover
Jackson
Michigan Center
Parma
Spring Arbor
Springport
Vandercook Lake
Vineyard Lake
Climate data from the nearest NOAA station, Manchester, Mi (11.5 mi from Napoleon). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.