Napoleon, OH Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Napoleon, a city in Henry County, Ohio.
Today
83°F
Sunny
Sunny, with a high near 83. Southeast wind around 0 mph.
7-day forecast for Napoleon
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 83°F | Sunny | 0 mph | 0% |
| Tonight | 57°F | Mostly Clear | 0 mph | 0% |
| Wednesday | 86°F | Sunny | 0 to 5 mph W | 0% |
| Wednesday Night | 64°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 0 to 5 mph SW | 16% |
| Thursday | 82°F | Showers And Thunderstorms Likely | 0 to 5 mph SW | 66% |
| Thursday Night | 64°F | Showers And Thunderstorms Likely | 0 to 5 mph S | 66% |
| Friday | 83°F | Showers And Thunderstorms Likely | 0 to 5 mph SW | 63% |
| Friday Night | 64°F | Showers And Thunderstorms Likely | 5 mph SW | 63% |
| Saturday | 85°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 5 to 10 mph SW | 21% |
| Saturday Night | 63°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 5 to 10 mph W | 27% |
| Sunday | 85°F | Chance Showers And Thunderstorms | 5 to 15 mph SW | 27% |
| Sunday Night | 66°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 5 to 15 mph SW | 52% |
| Monday | 87°F | Chance Showers And Thunderstorms | 5 to 15 mph SW | 52% |
| Monday Night | 67°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 10 to 15 mph SW | 63% |
Forecast source: National Weather Service (api.weather.gov) for Napoleon (41.398, -84.125). Updated through the day.
Growing snapshot for Napoleon
Last spring frost
Apr 24
First fall frost
Oct 21
Growing season
179 days
Hardiness zone
6a
More local growing data for Napoleon: nearby ZIP 43545 weather · frost dates · planting calendar · Ohio frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Napoleon, Oh (0.7 mi from Napoleon). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.