Potomac, MD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Potomac, a community in Montgomery County, Maryland.
This Afternoon
84°F
Partly Sunny
Partly sunny, with a high near 84. North wind around 10 mph.
7-day forecast for Potomac
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 84°F | Partly Sunny | 10 mph N | 10% |
| Tonight | 61°F | Mostly Cloudy | 9 mph N | 10% |
| Saturday | 78°F | Partly Sunny | 9 mph E | 5% |
| Saturday Night | 66°F | Mostly Cloudy then Isolated Rain Showers | 9 mph SE | 20% |
| Sunday | 82°F | Chance Rain Showers | 7 to 13 mph S | 49% |
| Sunday Night | 65°F | Showers And Thunderstorms Likely | 3 to 9 mph NW | 66% |
| Monday | 74°F | Chance Rain Showers | 8 to 12 mph NE | 41% |
| Monday Night | 61°F | Rain Showers Likely | 7 to 10 mph NE | 55% |
| Tuesday | 66°F | Rain Showers Likely | 13 mph NE | 58% |
| Tuesday Night | 56°F | Rain Showers Likely | 12 mph NE | 58% |
| Wednesday | 62°F | Chance Rain Showers | 13 mph NE | 50% |
| Wednesday Night | 55°F | Chance Showers And Thunderstorms | 8 to 12 mph NE | 50% |
| Thursday | 64°F | Chance Showers And Thunderstorms | 10 mph NE | 47% |
| Thursday Night | 54°F | Chance Showers And Thunderstorms | 5 to 9 mph N | 35% |
Forecast source: National Weather Service (api.weather.gov) for Potomac (39.013, -77.194). Updated through the day.
Growing snapshot for Potomac
Last spring frost
Apr 1
First fall frost
Nov 6
Growing season
219 days
Hardiness zone
7b
More local growing data for Potomac: nearby ZIP 20854 weather · frost dates · planting calendar · Maryland frost dates
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Climate data from the nearest NOAA station, Rockville 1 Ne, Md (6.1 mi from Potomac). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 18, 2026.