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
65°F
Light Rain
Rain and a slight chance of thunderstorms. Cloudy, with a high near 65. South wind 14 to 17 mph, with gusts as high as 29 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
7-day forecast for St. Martin
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 65°F | Light Rain | 14 to 17 mph S | 97% |
| Tonight | 50°F | Light Rain then Mostly Cloudy | 5 to 14 mph SW | 75% |
| Thursday | 64°F | Mostly Sunny | 5 to 13 mph SW | 0% |
| Thursday Night | 44°F | Partly Cloudy | 2 to 6 mph SW | 0% |
| Friday | 58°F | Chance Light Rain | 1 to 9 mph W | 30% |
| Friday Night | 37°F | Chance Light Rain then Mostly Cloudy | 5 to 8 mph NW | 30% |
| Saturday | 53°F | Mostly Sunny | 6 to 9 mph NW | 1% |
| Saturday Night | 33°F | Partly Cloudy | 1 to 5 mph NW | 0% |
| Sunday | 55°F | Mostly Sunny | 2 to 10 mph W | 2% |
| Sunday Night | 32°F | Mostly Clear | 3 to 7 mph W | 3% |
| Monday | 58°F | Sunny | 2 to 8 mph W | 3% |
| Monday Night | 35°F | Mostly Clear | 6 mph SW | 2% |
| Tuesday | 63°F | Sunny | 6 to 9 mph SW | 1% |
| Tuesday Night | 36°F | Mostly Clear | 5 mph NW | 1% |
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 Nov 4, 2026.