Potomac, MD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Potomac, a community in Montgomery County, Maryland.
Today
86°F
Partly Sunny
Partly sunny, with a high near 86. Northeast wind 3 to 7 mph.
7-day forecast for Potomac
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 86°F | Partly Sunny | 3 to 7 mph NE | 1% |
| Tonight | 71°F | Slight Chance Showers And Thunderstorms | 2 to 7 mph E | 62% |
| Wednesday | 86°F | Showers And Thunderstorms Likely | 2 to 7 mph SE | 65% |
| Wednesday Night | 73°F | Chance Showers And Thunderstorms | 3 to 7 mph S | 53% |
| Thursday | 90°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 6 to 10 mph S | 18% |
| Thursday Night | 74°F | Slight Chance Showers And Thunderstorms | 5 to 9 mph SW | 21% |
| Friday | 90°F | Mostly Sunny then Chance Showers And Thunderstorms | 3 to 7 mph SW | 39% |
| Friday Night | 72°F | Chance Showers And Thunderstorms | 1 to 6 mph SW | 49% |
| Saturday | 89°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 1 to 6 mph SW | 54% |
| Saturday Night | 71°F | Chance Showers And Thunderstorms | 1 to 5 mph SW | 54% |
| Sunday | 89°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 1 to 5 mph W | 20% |
| Sunday Night | 73°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 3 mph SW | 20% |
| Monday | 91°F | Mostly Sunny | 1 to 7 mph W | 12% |
| Monday Night | 73°F | Slight Chance Showers And Thunderstorms | 2 to 6 mph W | 15% |
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 Aug 4, 2026.