San Mar, MD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for San Mar, a community in Washington County, Maryland.
Today
86°F
Mostly Sunny
Mostly sunny, with a high near 86. East wind 2 to 6 mph.
7-day forecast for San Mar
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 86°F | Mostly Sunny | 2 to 6 mph E | 0% |
| Tonight | 68°F | Mostly Cloudy then Chance Showers And Thunderstorms | 2 to 6 mph E | 28% |
| Wednesday | 84°F | Rain Showers Likely then Chance Showers And Thunderstorms | 3 to 7 mph SE | 70% |
| Wednesday Night | 70°F | Chance Showers And Thunderstorms | 6 mph S | 52% |
| Thursday | 89°F | Partly Sunny then Chance Showers And Thunderstorms | 8 mph S | 52% |
| Thursday Night | 70°F | Chance Showers And Thunderstorms | 2 to 7 mph S | 52% |
| Friday | 89°F | Mostly Sunny then Chance Showers And Thunderstorms | 2 to 6 mph SW | 51% |
| Friday Night | 69°F | Chance Showers And Thunderstorms | 5 mph SW | 51% |
| Saturday | 88°F | Partly Sunny then Chance Showers And Thunderstorms | 2 to 7 mph W | 44% |
| Saturday Night | 69°F | Chance Showers And Thunderstorms | 2 to 6 mph SW | 44% |
| Sunday | 89°F | Mostly Sunny | 2 to 6 mph W | 14% |
| Sunday Night | 70°F | Partly Cloudy | 5 mph SW | 14% |
| Monday | 91°F | Mostly Sunny | 2 to 10 mph W | 14% |
| Monday Night | 70°F | Partly Cloudy | 5 to 8 mph W | 14% |
Forecast source: National Weather Service (api.weather.gov) for San Mar (39.552, -77.641). Updated through the day.
Growing snapshot for San Mar
Last spring frost
Apr 11
First fall frost
Oct 28
Growing season
199 days
Hardiness zone
7a
More local growing data for San Mar: nearby ZIP 21713 weather · frost dates · planting calendar · Maryland frost dates
Nearby towns & communities
Antietam
Bakersville
Beaver Creek
Big Pool
Big Spring
Boonsboro
Breathedsville
Brownsville
Cavetown
Cearfoss
Charlton
Chewsville
Clear Spring
Dargan
Downsville
Eakles Mill
Edgemont
Ernstville
Fairplay
Fairview
Fort Ritchie
Fountainhead-Orchard Hills
Funkstown
Gapland
Greensburg
Hagerstown
Halfway
Hancock
Highfield-Cascade
Indian Springs
Climate data from the nearest NOAA station, Hagerstown 1 E, Md (8.1 mi from San Mar). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.