Mechanicsville, MD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mechanicsville, a community in St. Mary's County, Maryland.
This Afternoon
85°F
Mostly Sunny
Mostly sunny, with a high near 85. North wind around 9 mph.
7-day forecast for Mechanicsville
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 85°F | Mostly Sunny | 9 mph N | 10% |
| Tonight | 64°F | Partly Cloudy | 8 mph NE | 10% |
| Saturday | 80°F | Partly Sunny | 10 mph NE | 10% |
| Saturday Night | 66°F | Mostly Cloudy | 5 to 8 mph SE | 10% |
| Sunday | 83°F | Mostly Sunny | 5 to 12 mph S | 13% |
| Sunday Night | 68°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 53% |
| Monday | 78°F | Chance Showers And Thunderstorms | 6 to 10 mph N | 45% |
| Monday Night | 64°F | Chance Showers And Thunderstorms | 8 to 12 mph NE | 51% |
| Tuesday | 70°F | Rain Showers Likely | 13 to 18 mph NE | 55% |
| Tuesday Night | 59°F | Rain Showers Likely | 13 to 17 mph NE | 55% |
| Wednesday | 65°F | Chance Rain Showers | 15 to 20 mph NE | 50% |
| Wednesday Night | 58°F | Chance Showers And Thunderstorms | 12 to 16 mph NE | 50% |
| Thursday | 66°F | Chance Showers And Thunderstorms | 14 to 17 mph NE | 41% |
| Thursday Night | 56°F | Chance Showers And Thunderstorms | 7 to 14 mph N | 35% |
Forecast source: National Weather Service (api.weather.gov) for Mechanicsville (38.427, -76.747). Updated through the day.
Growing snapshot for Mechanicsville
Last spring frost
Apr 17
First fall frost
Oct 27
Growing season
195 days
Hardiness zone
7b
More local growing data for Mechanicsville: nearby ZIP 20659 weather · frost dates · planting calendar · Maryland frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Mechanicsville 5 Ne, Md (5.9 mi from Mechanicsville). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.