St. Marys, OH Weather & Growing Conditions
Today
82°F
Sunny
Sunny, with a high near 82. Northeast wind around 1 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 82°F | Sunny | 1 mph NE | 0% |
| Tonight | 61°F | Mostly Clear | 1 mph E | 0% |
| Wednesday | 84°F | Sunny | 0 to 3 mph W | 0% |
| Wednesday Night | 65°F | Mostly Clear | 0 to 3 mph SW | 5% |
| Thursday | 84°F | Partly Sunny then Chance Showers And Thunderstorms | 2 to 7 mph SW | 52% |
| Thursday Night | 66°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 5 mph SW | 69% |
| Friday | 82°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 2 to 6 mph SW | 69% |
| Friday Night | 65°F | Chance Showers And Thunderstorms | 5 mph SW | 49% |
| Saturday | 84°F | Partly Sunny then Slight Chance Showers And Thunderstorms | 2 to 7 mph SW | 18% |
| Saturday Night | 67°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 2 to 6 mph SW | 18% |
| Sunday | 86°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 to 13 mph SW | 15% |
| Sunday Night | 69°F | Chance Showers And Thunderstorms | 7 to 12 mph SW | 25% |
| Monday | 86°F | Chance Rain Showers | 8 to 12 mph SW | 31% |
| Monday Night | 69°F | Chance Showers And Thunderstorms | 6 to 10 mph SW | 43% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for St. Marys, OH
Last spring frost
Apr 27
First fall frost
Oct 19
Growing season
175 days
Hardiness zone
6a
Explore more for St. Marys, OH: full frost dates · planting calendar · Ohio frost dates
Climate data from the nearest NOAA station, Celina 3 Ne, Oh (7.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.