Mercersville, MD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mercersville, a community in Washington County, Maryland.
This Afternoon
71°F
Sunny
Sunny, with a high near 71. Southeast wind around 7 mph.
7-day forecast for Mercersville
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 71°F | Sunny | 7 mph SE | 2% |
| Tonight | 50°F | Mostly Clear | 6 mph SE | 2% |
| Wednesday | 75°F | Mostly Sunny | 5 to 14 mph S | 2% |
| Wednesday Night | 62°F | Mostly Cloudy then Light Rain | 9 mph S | 88% |
| Thursday | 75°F | Light Rain | 5 to 9 mph S | 77% |
| Thursday Night | 58°F | Chance Light Rain | 0 to 5 mph W | 49% |
| Friday | 70°F | Chance Light Rain | 2 mph NW | 49% |
| Friday Night | 46°F | Chance Light Rain then Partly Cloudy | 3 mph NW | 42% |
| Saturday | 63°F | Mostly Sunny | 3 to 12 mph NW | 11% |
| Saturday Night | 37°F | Partly Cloudy | 3 to 7 mph NW | 11% |
| Sunday | 61°F | Mostly Sunny | 3 to 8 mph W | 6% |
| Sunday Night | 35°F | Partly Cloudy | 5 mph W | 14% |
| Monday | 60°F | Mostly Sunny | 5 to 13 mph NW | 14% |
| Monday Night | 34°F | Mostly Clear | 2 to 6 mph W | 7% |
Forecast source: National Weather Service (api.weather.gov) for Mercersville (39.499, -77.766). Updated through the day.
Growing snapshot for Mercersville
Last spring frost
Apr 26
First fall frost
Oct 18
Growing season
175 days
Hardiness zone
7a
More local growing data for Mercersville: nearby ZIP 21782 weather · frost dates · planting calendar · Maryland frost dates
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Climate data from the nearest NOAA station, Sharpsburg 5 S, Md (4.5 mi from Mercersville). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.