Napoleon, OH Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Napoleon, a city in Henry County, Ohio.
Overnight
61°F
Chance Rain Showers
A chance of rain showers after 3am. Mostly cloudy, with a low around 61. South wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 40%.
7-day forecast for Napoleon
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 61°F | Chance Rain Showers | 10 to 15 mph S | 43% |
| Wednesday | 68°F | Rain Showers | 15 to 20 mph S | 80% |
| Wednesday Night | 50°F | Chance Rain Showers then Mostly Cloudy | 10 to 15 mph SW | 41% |
| Thursday | 61°F | Mostly Cloudy | 10 to 15 mph SW | 9% |
| Thursday Night | 45°F | Mostly Cloudy then Chance Rain Showers | 5 to 10 mph W | 27% |
| Friday | 54°F | Chance Rain Showers | 5 to 10 mph W | 41% |
| Friday Night | 36°F | Chance Rain Showers then Mostly Cloudy | 5 to 10 mph NW | 29% |
| Saturday | 52°F | Partly Sunny | 5 to 10 mph NW | 10% |
| Saturday Night | 32°F | Partly Cloudy | 5 mph W | 1% |
| Sunday | 55°F | Sunny then Slight Chance Rain Showers | 5 to 15 mph W | 8% |
| Sunday Night | 33°F | Slight Chance Rain Showers then Partly Cloudy | 5 to 10 mph W | 8% |
| Monday | 58°F | Sunny | 5 to 10 mph SW | 2% |
| Monday Night | 37°F | Partly Cloudy | 5 to 10 mph SW | 2% |
| Tuesday | 61°F | Mostly Sunny | 5 to 10 mph W | 1% |
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 Nov 4, 2026.