Cobb Island, MD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Cobb Island, a community in Charles County, Maryland.
Today
85°F
Partly Sunny then Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms after 3pm. Partly sunny, with a high near 85. Northeast wind around 9 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Cobb Island
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 85°F | Partly Sunny then Slight Chance Showers And Thunderstorms | 9 mph NE | 23% |
| Tonight | 73°F | Chance Showers And Thunderstorms | 3 to 7 mph E | 69% |
| Wednesday | 86°F | Showers And Thunderstorms Likely | 3 to 7 mph S | 66% |
| Wednesday Night | 75°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 7 mph S | 20% |
| Thursday | 90°F | Mostly Sunny | 6 to 12 mph SW | 10% |
| Thursday Night | 77°F | Mostly Clear | 7 to 10 mph SW | 10% |
| Friday | 90°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 7 to 10 mph SW | 19% |
| Friday Night | 77°F | Chance Showers And Thunderstorms | 9 mph SW | 35% |
| Saturday | 87°F | Mostly Sunny then Chance Showers And Thunderstorms | 9 mph SW | 38% |
| Saturday Night | 75°F | Chance Showers And Thunderstorms | 5 to 8 mph SW | 38% |
| Sunday | 87°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 mph W | 23% |
| Sunday Night | 76°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 6 mph SW | 23% |
| Monday | 88°F | Mostly Sunny | 2 to 6 mph SW | 13% |
| Monday Night | 77°F | Partly Cloudy | 6 mph SW | 14% |
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 Aug 4, 2026.