National Harbor, MD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for National Harbor, a community in Prince George's County, Maryland.
Overnight
53°F
Mostly Clear
Mostly clear, with a low around 53. South wind around 3 mph.
7-day forecast for National Harbor
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 53°F | Mostly Clear | 3 mph S | 1% |
| Wednesday | 75°F | Mostly Sunny | 3 to 9 mph S | 1% |
| Wednesday Night | 63°F | Mostly Cloudy then Slight Chance Rain Showers | 7 mph S | 22% |
| Thursday | 76°F | Chance Rain Showers | 7 to 10 mph S | 36% |
| Thursday Night | 63°F | Showers And Thunderstorms Likely | 2 to 6 mph SW | 66% |
| Friday | 71°F | Showers And Thunderstorms Likely then Light Rain Likely | 5 mph N | 73% |
| Friday Night | 53°F | Chance Light Rain then Partly Cloudy | 2 to 7 mph N | 44% |
| Saturday | 66°F | Mostly Sunny | 7 to 12 mph NW | 5% |
| Saturday Night | 45°F | Mostly Clear | 6 to 9 mph NW | 5% |
| Sunday | 62°F | Mostly Sunny | 6 to 10 mph NW | 1% |
| Sunday Night | 44°F | Mostly Clear | 7 mph W | 6% |
| Monday | 62°F | Sunny | 7 to 14 mph NW | 6% |
| Monday Night | 42°F | Mostly Clear | 2 to 7 mph W | 5% |
| Tuesday | 65°F | Sunny | 5 to 9 mph SW | 3% |
Forecast source: National Weather Service (api.weather.gov) for National Harbor (38.783, -77.008). Updated through the day.
Growing snapshot for National Harbor
Last spring frost
Apr 3
First fall frost
Nov 8
Growing season
217 days
Hardiness zone
8a
More local growing data for National Harbor: nearby ZIP 20745 weather · frost dates · planting calendar · Maryland frost dates
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Climate data from the nearest NOAA station, Oxon Hill, Md (0.7 mi from National Harbor). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.