Warm
Average highs sit around 30°C, giving warm days by monthly-average standards.
Weather Guide
National Harbor, Maryland, United States Average Monthly Weather
Weather score52Mixed annual avg
Best months: June, August, July
Across the year, average daytime temperatures are around 19°C, sunshine averages 6.9h per day, and rainfall totals about 981mm.
Annual weather
Annual averages
Temp
19°C
Rain
981mm
Annual total
Sun
6.9h
Weather score
52
Mixed avg
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 104mm, so some wet days are possible.
Bright
Sunshine averages 8.4h per day, so bright days are a strong part of the month.
Map
Weather map
Compare National Harbor, Maryland, United States with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
August30°C average high
August is one of National Harbor's warmest months, with daytime heat above the yearly average.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
Rain
August104mm average rain
August is one of National Harbor's wettest months, so rain is likely to be a major planning factor.
Driest monthsJanuary to July and September to December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
August8.4 hours average sun
August is brighter than National Harbor's yearly average, though the strongest sunshine usually sits closer to the peak months.
Brightest monthsMay to August
This stretch has the strongest sunshine in the monthly averages.
Weather score
August76 weather score
August scores above National Harbor's yearly average, so the overall weather mix is stronger than most months.
Best weather monthsJune to September
These months have the strongest weather score in the monthly averages.
