Mechanicsville, MD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mechanicsville, a community in St. Mary's County, Maryland.
Today
75°F
Patchy Fog then Mostly Sunny
Patchy fog before 9am. Mostly sunny, with a high near 75. South wind 3 to 8 mph.
7-day forecast for Mechanicsville
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 75°F | Patchy Fog then Mostly Sunny | 3 to 8 mph S | 1% |
| Tonight | 61°F | Mostly Cloudy | 7 mph S | 10% |
| Thursday | 76°F | Chance Rain Showers | 7 to 12 mph S | 25% |
| Thursday Night | 63°F | Showers And Thunderstorms | 6 mph S | 79% |
| Friday | 70°F | Showers And Thunderstorms then Light Rain | 5 mph SW | 85% |
| Friday Night | 49°F | Light Rain Likely | 2 to 7 mph N | 70% |
| Saturday | 64°F | Mostly Sunny | 7 to 13 mph NW | 4% |
| Saturday Night | 41°F | Mostly Clear | 8 mph NW | 3% |
| Sunday | 61°F | Sunny | 6 to 10 mph NW | 3% |
| Sunday Night | 40°F | Mostly Clear | 6 mph W | 6% |
| Monday | 62°F | Sunny | 6 to 15 mph W | 6% |
| Monday Night | 37°F | Mostly Clear | 6 mph W | 5% |
| Tuesday | 64°F | Sunny | 5 to 10 mph SW | 2% |
| Tuesday Night | 40°F | Mostly Clear | 5 mph W | 1% |
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 Nov 4, 2026.