Napoleon, OH Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Napoleon, a city in Henry County, Ohio.
This Afternoon
75°F
Mostly Sunny
Mostly sunny, with a high near 75. East wind around 10 mph.
7-day forecast for Napoleon
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 75°F | Mostly Sunny | 10 mph E | 1% |
| Tonight | 56°F | Partly Cloudy | 5 to 10 mph NE | 14% |
| Saturday | 75°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 5 mph E | 88% |
| Saturday Night | 62°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 5 mph S | 86% |
| Sunday | 72°F | Showers And Thunderstorms | 5 to 10 mph NW | 84% |
| Sunday Night | 54°F | Showers And Thunderstorms Likely | 10 to 15 mph NE | 55% |
| Monday | 65°F | Chance Rain Showers | 15 to 20 mph NE | 41% |
| Monday Night | 51°F | Chance Rain Showers | 15 mph NE | 41% |
| Tuesday | 63°F | Slight Chance Rain Showers | 15 to 20 mph NE | 19% |
| Tuesday Night | 52°F | Chance Rain Showers | 15 mph NE | 36% |
| Wednesday | 65°F | Chance Rain Showers | 15 mph NE | 38% |
| Wednesday Night | 52°F | Slight Chance Rain Showers then Mostly Cloudy | 5 to 10 mph NE | 24% |
| Thursday | 67°F | Mostly Cloudy | 10 mph NE | 9% |
| Thursday Night | 51°F | Mostly Cloudy | 5 to 10 mph N | 9% |
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.