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.
This Afternoon
85°F
Partly Sunny
Partly sunny, with a high near 85. North wind around 10 mph.
7-day forecast for National Harbor
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 85°F | Partly Sunny | 10 mph N | 10% |
| Tonight | 64°F | Mostly Cloudy | 6 to 9 mph N | 10% |
| Saturday | 79°F | Partly Sunny | 9 mph NE | 10% |
| Saturday Night | 67°F | Mostly Cloudy | 5 to 8 mph SE | 10% |
| Sunday | 84°F | Partly Sunny then Chance Showers And Thunderstorms | 5 to 13 mph S | 38% |
| Sunday Night | 68°F | Showers And Thunderstorms Likely | 5 to 9 mph W | 62% |
| Monday | 76°F | Chance Rain Showers | 7 to 10 mph N | 42% |
| Monday Night | 63°F | Chance Rain Showers | 7 to 10 mph NE | 54% |
| Tuesday | 68°F | Rain Showers Likely | 12 to 15 mph NE | 59% |
| Tuesday Night | 58°F | Rain Showers Likely | 10 to 14 mph NE | 59% |
| Wednesday | 63°F | Chance Rain Showers | 14 mph NE | 50% |
| Wednesday Night | 58°F | Chance Showers And Thunderstorms | 8 to 13 mph NE | 50% |
| Thursday | 65°F | Chance Showers And Thunderstorms | 12 mph NE | 46% |
| Thursday Night | 56°F | Chance Showers And Thunderstorms | 5 to 10 mph N | 33% |
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 Sep 19, 2026.