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
84°F
Partly Sunny then Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms after 5pm. Partly sunny, with a high near 84. Northeast wind around 8 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Mechanicsville
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Partly Sunny then Slight Chance Showers And Thunderstorms | 8 mph NE | 15% |
| Tonight | 69°F | Slight Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 2 to 7 mph E | 73% |
| Wednesday | 86°F | Showers And Thunderstorms Likely | 3 to 8 mph SE | 65% |
| Wednesday Night | 72°F | Chance Showers And Thunderstorms then Partly Cloudy | 8 mph S | 26% |
| Thursday | 90°F | Mostly Sunny | 7 to 12 mph S | 10% |
| Thursday Night | 73°F | Mostly Clear | 7 to 10 mph S | 10% |
| Friday | 90°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 10 mph SW | 22% |
| Friday Night | 72°F | Chance Showers And Thunderstorms | 6 to 9 mph SW | 37% |
| Saturday | 89°F | Mostly Sunny then Chance Showers And Thunderstorms | 8 mph SW | 43% |
| Saturday Night | 70°F | Chance Showers And Thunderstorms | 3 to 7 mph SW | 43% |
| Sunday | 89°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 mph SW | 22% |
| Sunday Night | 72°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 5 mph SW | 22% |
| Monday | 91°F | Mostly Sunny | 3 to 7 mph W | 11% |
| Monday Night | 72°F | Partly Cloudy | 7 mph SW | 14% |
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 Aug 4, 2026.