St. Henry, OH Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for St. Henry, a village in Mercer County, Ohio.
Tonight
62°F
Mostly Cloudy then Rain Showers
Rain showers after 3am. Mostly cloudy, with a low around 62. South wind 12 to 16 mph, with gusts as high as 28 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for St. Henry
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 62°F | Mostly Cloudy then Rain Showers | 12 to 16 mph S | 76% |
| Wednesday | 69°F | Rain Showers | 13 to 18 mph S | 95% |
| Wednesday Night | 49°F | Mostly Cloudy | 6 to 10 mph SW | 11% |
| Thursday | 63°F | Mostly Sunny | 8 to 15 mph SW | 1% |
| Thursday Night | 45°F | Mostly Cloudy | 3 to 8 mph W | 1% |
| Friday | 58°F | Chance Light Rain | 3 to 9 mph NW | 25% |
| Friday Night | 38°F | Slight Chance Light Rain | 8 mph NW | 22% |
| Saturday | 54°F | Slight Chance Light Rain | 8 mph NW | 15% |
| Saturday Night | 34°F | Partly Cloudy | 1 to 5 mph W | 5% |
| Sunday | 56°F | Mostly Sunny | 3 to 10 mph W | 14% |
| Sunday Night | 34°F | Partly Cloudy | 8 mph W | 14% |
| Monday | 59°F | Mostly Sunny | 6 to 12 mph W | 13% |
| Monday Night | 38°F | Mostly Clear | 9 mph SW | 11% |
| Tuesday | 63°F | Mostly Sunny | 8 to 12 mph W | 3% |
Forecast source: National Weather Service (api.weather.gov) for St. Henry (40.420, -84.632). Updated through the day.
Growing snapshot for St. Henry
Last spring frost
Apr 27
First fall frost
Oct 19
Growing season
175 days
Hardiness zone
6a
More local growing data for St. Henry: nearby ZIP 45883 weather · frost dates · planting calendar · Ohio frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Celina 3 Ne, Oh (12.5 mi from St. Henry). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.