Cobb Island, MD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Cobb Island, a community in Charles County, Maryland.
This Afternoon
86°F
Mostly Sunny
Mostly sunny, with a high near 86. Northeast wind around 9 mph.
7-day forecast for Cobb Island
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 86°F | Mostly Sunny | 9 mph NE | 10% |
| Tonight | 68°F | Mostly Cloudy | 9 mph NE | 10% |
| Saturday | 80°F | Partly Sunny | 10 mph NE | 10% |
| Saturday Night | 70°F | Mostly Cloudy | 6 to 10 mph SE | 10% |
| Sunday | 84°F | Mostly Sunny | 6 to 12 mph S | 10% |
| Sunday Night | 71°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 45% |
| Monday | 79°F | Chance Showers And Thunderstorms | 5 to 10 mph N | 46% |
| Monday Night | 68°F | Chance Showers And Thunderstorms | 10 to 16 mph NE | 52% |
| Tuesday | 71°F | Showers And Thunderstorms Likely | 15 to 22 mph NE | 59% |
| Tuesday Night | 64°F | Showers And Thunderstorms Likely | 22 mph NE | 59% |
| Wednesday | 66°F | Chance Rain Showers | 21 mph NE | 50% |
| Wednesday Night | 63°F | Chance Showers And Thunderstorms | 18 to 22 mph NE | 50% |
| Thursday | 66°F | Chance Showers And Thunderstorms | 15 to 18 mph NE | 41% |
| Thursday Night | 62°F | Chance Showers And Thunderstorms | 12 to 17 mph N | 36% |
Forecast source: National Weather Service (api.weather.gov) for Cobb Island (38.264, -76.849). Updated through the day.
Growing snapshot for Cobb Island
Last spring frost
Apr 17
First fall frost
Oct 27
Growing season
195 days
Hardiness zone
7b
More local growing data for Cobb Island: nearby ZIP 20661 weather · frost dates · planting calendar · Maryland frost dates
Nearby towns & communities
Benedict
Bensville
Brandywine
Bryans Road
Bryantown
Charlotte Hall
Golden Beach
Hughesville
Indian Head
La Plata
Pomfret
Port Tobacco Village
Potomac Heights
Rock Point
Waldorf
Climate data from the nearest NOAA station, Mechanicsville 5 Ne, Md (17.2 mi from Cobb Island). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.