Potomac, MD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Potomac, a community in Montgomery County, Maryland.
Tonight
52°F
Mostly Clear
Mostly clear, with a low around 52. Southeast wind around 5 mph.
7-day forecast for Potomac
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 52°F | Mostly Clear | 5 mph SE | 2% |
| Wednesday | 74°F | Mostly Sunny | 3 to 10 mph S | 2% |
| Wednesday Night | 62°F | Mostly Cloudy then Chance Light Rain | 8 mph S | 44% |
| Thursday | 75°F | Chance Light Rain | 10 mph S | 44% |
| Thursday Night | 61°F | Chance Light Rain | 2 to 7 mph SW | 51% |
| Friday | 70°F | Rain Likely | 5 mph NW | 64% |
| Friday Night | 50°F | Light Rain Likely | 2 to 7 mph NW | 64% |
| Saturday | 64°F | Mostly Sunny | 7 to 12 mph NW | 11% |
| Saturday Night | 42°F | Partly Cloudy | 5 to 8 mph NW | 11% |
| Sunday | 61°F | Mostly Sunny | 8 mph NW | 6% |
| Sunday Night | 42°F | Partly Cloudy then Slight Chance Light Rain | 5 to 8 mph NW | 20% |
| Monday | 61°F | Slight Chance Light Rain | 9 to 14 mph NW | 20% |
| Monday Night | 39°F | Slight Chance Light Rain | 3 to 8 mph W | 20% |
| Tuesday | 64°F | Sunny | 6 to 12 mph W | 12% |
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 Nov 4, 2026.