San Mar, MD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for San Mar, a community in Washington County, Maryland.
This Afternoon
70°F
Sunny
Sunny, with a high near 70. Southeast wind around 8 mph.
7-day forecast for San Mar
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 70°F | Sunny | 8 mph SE | 3% |
| Tonight | 53°F | Mostly Clear | 7 mph SE | 2% |
| Wednesday | 73°F | Mostly Sunny | 6 to 14 mph S | 2% |
| Wednesday Night | 62°F | Mostly Cloudy then Light Rain | 12 mph S | 86% |
| Thursday | 74°F | Light Rain | 7 to 12 mph S | 79% |
| Thursday Night | 59°F | Light Rain Likely | 2 to 6 mph W | 57% |
| Friday | 69°F | Chance Light Rain | 3 mph NW | 52% |
| Friday Night | 49°F | Chance Light Rain then Partly Cloudy | 5 mph NW | 44% |
| Saturday | 62°F | Mostly Sunny | 5 to 12 mph NW | 11% |
| Saturday Night | 42°F | Partly Cloudy | 3 to 9 mph NW | 11% |
| Sunday | 59°F | Mostly Sunny | 3 to 9 mph W | 6% |
| Sunday Night | 41°F | Partly Cloudy then Slight Chance Light Rain | 6 mph W | 15% |
| Monday | 59°F | Slight Chance Light Rain | 6 to 14 mph NW | 15% |
| Monday Night | 40°F | Mostly Clear | 3 to 8 mph W | 7% |
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
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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 Nov 3, 2026.