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
75°F
Mostly Sunny
Mostly sunny, with a high near 75. Southeast wind around 7 mph.
7-day forecast for Cobb Island
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 75°F | Mostly Sunny | 7 mph SE | 1% |
| Tonight | 63°F | Mostly Cloudy | 7 mph S | 9% |
| Thursday | 75°F | Slight Chance Rain Showers | 6 to 9 mph S | 22% |
| Thursday Night | 64°F | Showers And Thunderstorms | 6 mph S | 79% |
| Friday | 70°F | Showers And Thunderstorms then Light Rain | 5 mph SW | 87% |
| Friday Night | 54°F | Light Rain Likely | 2 to 6 mph N | 74% |
| Saturday | 64°F | Mostly Sunny | 6 to 10 mph NW | 4% |
| Saturday Night | 50°F | Mostly Clear | 8 to 12 mph NW | 2% |
| Sunday | 61°F | Sunny | 10 mph NW | 3% |
| Sunday Night | 49°F | Mostly Clear | 8 mph W | 6% |
| Monday | 61°F | Sunny | 8 to 14 mph NW | 6% |
| Monday Night | 47°F | Mostly Clear | 7 mph W | 5% |
| Tuesday | 65°F | Sunny | 6 to 9 mph SW | 2% |
| Tuesday Night | 49°F | Mostly Clear | 7 mph W | 1% |
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 Nov 4, 2026.