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.
Today
85°F
Partly Sunny
Partly sunny, with a high near 85. Northeast wind 5 to 8 mph.
7-day forecast for National Harbor
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 85°F | Partly Sunny | 5 to 8 mph NE | 6% |
| Tonight | 71°F | Slight Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 1 to 7 mph E | 62% |
| Wednesday | 86°F | Showers And Thunderstorms Likely | 2 to 7 mph SE | 64% |
| Wednesday Night | 73°F | Chance Showers And Thunderstorms | 3 to 7 mph S | 50% |
| Thursday | 90°F | Mostly Sunny | 6 to 10 mph SW | 12% |
| Thursday Night | 74°F | Partly Cloudy | 5 to 9 mph SW | 12% |
| Friday | 91°F | Mostly Sunny then Chance Showers And Thunderstorms | 8 mph SW | 32% |
| Friday Night | 73°F | Chance Showers And Thunderstorms | 3 to 7 mph SW | 45% |
| Saturday | 90°F | Partly Sunny then Chance Showers And Thunderstorms | 6 mph SW | 51% |
| Saturday Night | 72°F | Chance Showers And Thunderstorms | 2 to 6 mph SW | 51% |
| Sunday | 90°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 mph W | 20% |
| Sunday Night | 73°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 5 mph SW | 20% |
| Monday | 92°F | Mostly Sunny | 2 to 7 mph W | 10% |
| Monday Night | 74°F | Slight Chance Showers And Thunderstorms | 2 to 7 mph W | 16% |
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 Aug 4, 2026.