Napoleon, OH Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Napoleon, a city in Henry County, Ohio.
This Afternoon
72°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely before 5pm, then a chance of showers and thunderstorms. Cloudy, with a high near 72. Southeast wind around 5 mph. Chance of precipitation is 70%.
7-day forecast for Napoleon
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 72°F | Showers And Thunderstorms Likely | 5 mph SE | 73% |
| Tonight | 64°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 0 to 5 mph E | 88% |
| Sunday | 72°F | Showers And Thunderstorms | 5 to 10 mph N | 81% |
| Sunday Night | 53°F | Chance Showers And Thunderstorms | 10 to 15 mph NE | 51% |
| Monday | 66°F | Chance Rain Showers | 15 mph NE | 28% |
| Monday Night | 50°F | Mostly Cloudy | 15 mph NE | 14% |
| Tuesday | 63°F | Slight Chance Rain Showers | 15 to 20 mph NE | 20% |
| Tuesday Night | 52°F | Chance Rain Showers | 15 to 20 mph NE | 40% |
| Wednesday | 64°F | Showers And Thunderstorms Likely | 15 mph NE | 57% |
| Wednesday Night | 51°F | Showers And Thunderstorms Likely | 10 to 15 mph NE | 57% |
| Thursday | 67°F | Slight Chance Rain Showers then Partly Sunny | 10 mph E | 18% |
| Thursday Night | 50°F | Mostly Cloudy | 5 to 10 mph NE | 10% |
| Friday | 70°F | Partly Sunny | 5 to 10 mph NE | 10% |
| Friday Night | 49°F | Partly Cloudy | 0 to 5 mph NE | 8% |
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 Sep 19, 2026.