Napoleon, MI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Napoleon, a community in Jackson County, Michigan.
Today
85°F
Sunny
Sunny, with a high near 85. South southwest wind around 6 mph.
7-day forecast for Napoleon
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 85°F | Sunny | 6 mph SSW | 0% |
| Tonight | 58°F | Mostly Clear | 1 to 6 mph S | 0% |
| Wednesday | 87°F | Sunny | 1 to 7 mph SW | 3% |
| Wednesday Night | 63°F | Slight Chance Showers And Thunderstorms | 1 to 6 mph WSW | 64% |
| Thursday | 83°F | Showers And Thunderstorms | 2 to 7 mph WSW | 76% |
| Thursday Night | 61°F | Showers And Thunderstorms then Chance Showers And Thunderstorms | 0 to 5 mph WSW | 76% |
| Friday | 85°F | Chance Showers And Thunderstorms | 0 to 5 mph SW | 40% |
| Friday Night | 61°F | Chance Showers And Thunderstorms then Partly Cloudy | 1 to 5 mph SW | 40% |
| Saturday | 87°F | Mostly Sunny | 2 to 9 mph WSW | 11% |
| Saturday Night | 64°F | Chance Rain Showers | 3 to 8 mph SW | 26% |
| Sunday | 88°F | Chance Rain Showers | 3 to 14 mph SW | 26% |
| Sunday Night | 66°F | Chance Rain Showers | 7 to 13 mph WSW | 42% |
| Monday | 87°F | Chance Rain Showers | 7 to 10 mph WSW | 42% |
| Monday Night | 64°F | Chance Showers And Thunderstorms | 5 to 10 mph WSW | 52% |
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 Aug 4, 2026.