Charlestown, MD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Charlestown, a town in Cecil County, Maryland.
Today
85°F
Mostly Sunny
Mostly sunny, with a high near 85. East wind around 5 mph.
7-day forecast for Charlestown
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 85°F | Mostly Sunny | 5 mph E | 0% |
| Tonight | 68°F | Mostly Cloudy then Slight Chance Showers And Thunderstorms | 2 mph E | 16% |
| Wednesday | 84°F | Slight Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 5 mph SE | 71% |
| Wednesday Night | 73°F | Chance Showers And Thunderstorms | 3 mph S | 48% |
| Thursday | 88°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 3 to 9 mph SW | 21% |
| Thursday Night | 74°F | Chance Showers And Thunderstorms | 3 to 7 mph SW | 34% |
| Friday | 88°F | Mostly Sunny then Chance Showers And Thunderstorms | 3 to 7 mph SW | 34% |
| Friday Night | 72°F | Chance Showers And Thunderstorms | 5 mph SW | 47% |
| Saturday | 87°F | Partly Sunny then Chance Showers And Thunderstorms | 2 to 6 mph SW | 38% |
| Saturday Night | 71°F | Chance Showers And Thunderstorms | 3 mph SW | 38% |
| Sunday | 88°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 1 to 5 mph W | 16% |
| Sunday Night | 73°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 3 mph SW | 16% |
| Monday | 89°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 2 to 7 mph W | 17% |
| Monday Night | 72°F | Slight Chance Showers And Thunderstorms | 5 mph W | 18% |
Forecast source: National Weather Service (api.weather.gov) for Charlestown (39.582, -75.987). Updated through the day.
Growing snapshot for Charlestown
Last spring frost
Apr 3
First fall frost
Nov 6
Growing season
217 days
Hardiness zone
7b
More local growing data for Charlestown: nearby ZIP 21914 weather · frost dates · planting calendar · Maryland frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Conowingo Dam, Md (11.6 mi from Charlestown). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.