Cobb Island, MD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Cobb Island, a community in Charles County, Maryland.
Overnight
68°F
Partly Cloudy
Partly cloudy, with a low around 68. Northeast wind around 9 mph.
7-day forecast for Cobb Island
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 68°F | Partly Cloudy | 9 mph NE | 4% |
| Saturday | 80°F | Mostly Sunny | 6 to 9 mph NE | 6% |
| Saturday Night | 69°F | Mostly Cloudy | 7 mph SE | 11% |
| Sunday | 85°F | Partly Sunny | 5 to 9 mph S | 14% |
| Sunday Night | 68°F | Showers And Thunderstorms Likely | 3 to 7 mph W | 61% |
| Monday | 74°F | Rain Showers Likely | 10 mph NE | 55% |
| Monday Night | 64°F | Chance Rain Showers | 10 mph NE | 38% |
| Tuesday | 70°F | Rain Showers Likely | 10 to 18 mph NE | 55% |
| Tuesday Night | 62°F | Rain Showers Likely | 17 to 23 mph NE | 55% |
| Wednesday | 67°F | Chance Rain Showers | 18 to 23 mph NE | 47% |
| Wednesday Night | 62°F | Chance Rain Showers | 20 to 23 mph NE | 47% |
| Thursday | 66°F | Chance Showers And Thunderstorms | 18 to 23 mph NE | 44% |
| Thursday Night | 60°F | Chance Showers And Thunderstorms | 16 to 22 mph N | 40% |
| Friday | 68°F | Slight Chance Rain Showers | 15 mph N | 21% |
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.