Mercersville, MD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mercersville, a community in Washington County, Maryland.
This Afternoon
83°F
Isolated Rain Showers
Isolated rain showers. Partly sunny, with a high near 83. North wind around 10 mph. Chance of precipitation is 20%.
7-day forecast for Mercersville
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 83°F | Isolated Rain Showers | 10 mph N | 20% |
| Tonight | 57°F | Isolated Rain Showers then Partly Cloudy | 6 to 9 mph N | 20% |
| Saturday | 77°F | Partly Sunny | 5 to 9 mph E | 5% |
| Saturday Night | 65°F | Mostly Cloudy then Scattered Rain Showers | 8 mph SE | 30% |
| Sunday | 81°F | Showers And Thunderstorms | 8 to 13 mph S | 77% |
| Sunday Night | 62°F | Showers And Thunderstorms | 5 to 8 mph NW | 77% |
| Monday | 71°F | Chance Rain Showers | 7 to 12 mph N | 41% |
| Monday Night | 58°F | Rain Showers Likely | 6 to 9 mph NE | 61% |
| Tuesday | 63°F | Showers And Thunderstorms | 10 mph NE | 75% |
| Tuesday Night | 53°F | Showers And Thunderstorms | 10 mph NE | 75% |
| Wednesday | 59°F | Rain Showers Likely | 10 mph NE | 57% |
| Wednesday Night | 53°F | Showers And Thunderstorms Likely | 6 to 9 mph NE | 55% |
| Thursday | 62°F | Chance Showers And Thunderstorms | 9 mph NE | 52% |
| Thursday Night | 53°F | Chance Rain Showers | 6 mph N | 34% |
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 Sep 18, 2026.