Williamsport, MD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Williamsport, a town in Washington County, Maryland.
Today
87°F
Mostly Sunny
Mostly sunny, with a high near 87. East wind around 5 mph.
7-day forecast for Williamsport
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 87°F | Mostly Sunny | 5 mph E | 0% |
| Tonight | 68°F | Mostly Cloudy then Chance Rain Showers | 1 to 5 mph E | 28% |
| Wednesday | 85°F | Showers And Thunderstorms Likely | 2 to 6 mph E | 63% |
| Wednesday Night | 70°F | Chance Showers And Thunderstorms | 6 mph SE | 37% |
| Thursday | 90°F | Mostly Sunny then Showers And Thunderstorms Likely | 3 to 7 mph S | 55% |
| Thursday Night | 70°F | Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms | 1 to 5 mph SW | 55% |
| Friday | 90°F | Partly Sunny then Showers And Thunderstorms Likely | 1 to 6 mph SW | 55% |
| Friday Night | 69°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 1 to 5 mph SW | 55% |
| Saturday | 88°F | Partly Sunny then Chance Showers And Thunderstorms | 1 to 6 mph W | 45% |
| Saturday Night | 69°F | Chance Showers And Thunderstorms | 1 to 5 mph SW | 45% |
| Sunday | 90°F | Mostly Sunny | 1 to 5 mph W | 14% |
| Sunday Night | 70°F | Partly Cloudy | 1 to 5 mph SW | 14% |
| Monday | 92°F | Mostly Sunny | 1 to 10 mph W | 13% |
| Monday Night | 70°F | Partly Cloudy | 2 to 8 mph W | 13% |
Forecast source: National Weather Service (api.weather.gov) for Williamsport (39.597, -77.818). Updated through the day.
Growing snapshot for Williamsport
Last spring frost
Apr 11
First fall frost
Oct 28
Growing season
199 days
Hardiness zone
7a
More local growing data for Williamsport: nearby ZIP 21795 weather · frost dates · planting calendar · Maryland frost dates
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Climate data from the nearest NOAA station, Hagerstown 1 E, Md (7.9 mi from Williamsport). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.