St. Martin, OH Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for St. Martin, a community in Brown County, Ohio.
Today
85°F
Sunny
Sunny, with a high near 85. Northeast wind around 5 mph.
7-day forecast for St. Martin
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 85°F | Sunny | 5 mph NE | 0% |
| Tonight | 65°F | Mostly Clear | 5 mph NE | 4% |
| Wednesday | 87°F | Partly Sunny then Chance Showers And Thunderstorms | 3 mph N | 30% |
| Wednesday Night | 67°F | Chance Showers And Thunderstorms then Partly Cloudy | 3 mph S | 29% |
| Thursday | 87°F | Mostly Sunny then Chance Showers And Thunderstorms | 2 to 8 mph SW | 45% |
| Thursday Night | 68°F | Chance Showers And Thunderstorms | 5 mph S | 52% |
| Friday | 85°F | Showers And Thunderstorms Likely | 3 to 8 mph SW | 69% |
| Friday Night | 66°F | Showers And Thunderstorms Likely | 2 to 6 mph SW | 69% |
| Saturday | 85°F | Chance Showers And Thunderstorms | 2 to 8 mph SW | 30% |
| Saturday Night | 67°F | Chance Showers And Thunderstorms | 2 to 6 mph SW | 30% |
| Sunday | 87°F | Mostly Sunny | 2 to 9 mph SW | 13% |
| Sunday Night | 69°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 7 mph SW | 15% |
| Monday | 88°F | Chance Showers And Thunderstorms | 6 to 10 mph SW | 25% |
| Monday Night | 69°F | Chance Showers And Thunderstorms | 5 to 8 mph SW | 29% |
Forecast source: National Weather Service (api.weather.gov) for St. Martin (39.212, -83.884). Updated through the day.
Growing snapshot for St. Martin
Last spring frost
Apr 24
First fall frost
Oct 20
Growing season
178 days
Hardiness zone
6b
More local growing data for St. Martin: nearby ZIP 45118 weather · frost dates · planting calendar · Ohio frost dates
Nearby towns & communities
Aberdeen
Buford
Fayetteville
Georgetown
Hamersville
Higginsport
Lake Lorelei
Lake Waynoka
Mount Orab
Ripley
Russellville
Sardinia
Climate data from the nearest NOAA station, Hillsboro, Oh (17 mi from St. Martin). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.