Weather in National Harbor

14-day forecast · updated today, Thursday, October 29, at 5:11 am (EDT)

Now · overcast 55 °F

Feels like: 55 °F
Low / high: 52 / 70 °F
Rain: 0%
Wind: 2 mph SW

↘ 30.28 inHg · falling

Today in National Harbor: overcast, 52 °F to 70 °F, with a 0% chance of rain and a light air from the southwest (2 mph). Tomorrow, clear sky, 53 °F to 74 °F and a 0% chance of rain. The warmest day of the week is Friday 30, at 74 °F. Next likely rain: Thursday 5 (37%).

Temperatures for the next 14 days

70° 52°
Today
74° 53°
Fri 30
64° 47°
Sat 31
67° 47°
Sun 1
69° 48°
Mon 2
72° 52°
Tue 3
74° 56°
Wed 4
73° 59°
Thu 5
68° 56°
Fri 6
63° 51°
Sat 7
62° 47°
Sun 8
63° 42°
Mon 9
68° 49°
Tue 10
60° 48°
Wed 11

Day by day

Day	Sky	Low / high	Rain	Max wind	High tides	Model
Today · 29	Overcast	52 / 70 °F	0%	8 mph SSW	11:09 am · 11:24 pm	HRRR
Fri 30	Clear sky	53 / 74 °F	0%	11 mph NW	12:05 pm	NBM
Sat 31	Overcast	47 / 64 °F	1%	6 mph N	12:21 am · 1:07 pm	NBM
Sun 1	Overcast	47 / 67 °F	1%	5 mph SSE	1:23 am · 1:11 pm	NBM
Mon 2	Overcast	48 / 69 °F	7%	4 mph S	1:30 am · 2:18 pm	NBM
Tue 3	Overcast	52 / 72 °F	9%	8 mph SE	2:42 am · 3:27 pm	NBM
Wed 4	Overcast	56 / 74 °F	18%	9 mph SE	3:53 am · 4:29 pm	NBM
Thu 5	Rain	59 / 73 °F	37% · 0.92 in	10 mph SE	4:54 am · 5:22 pm	NBM
Fri 6	Rain	56 / 68 °F	37% · 0.54 in	10 mph NW	5:47 am · 6:11 pm	NBM
Sat 7	Heavy drizzle	51 / 63 °F	28% · 0.14 in	10 mph WNW	6:35 am · 6:56 pm	NBM
Sun 8	Partly cloudy	47 / 62 °F	9% · 0.06 in	8 mph NW	7:21 am · 7:38 pm	NBM
Mon 9	Partly cloudy	42 / 63 °F	16% · 0.01 in	5 mph SSW	8:05 am · 8:18 pm	NBM + ECMWF
Tue 10	Heavy drizzle	49 / 68 °F	18% · 0.29 in	6 mph SW	8:47 am · 8:55 pm	ECMWF
Wed 11	Light drizzle	48 / 60 °F	18% · 0.02 in	9 mph WNW	9:29 am · 9:32 pm	ECMWF

Each hour comes from the best model for this spot: HRRR until Friday 30 12:00 am; then NBM until Monday 9 2:00 am; then ECMWF until Thursday 12 10:00 pm; then GFS.

Each day comes from the best model covering this spot: regional ones first (HRRR and NBM in the U.S., AROME, ICON-EU), then ECMWF; day 16, NOAA GFS. Waves: Météo-France up to day 10, then ECMWF WAM, coarser and further offshore. High tides: our own tide calculation.

Today, every 3 hours

Time	12:00 am	3:00 am	6:00 am	9:00 am	12:00 pm	3:00 pm	6:00 pm	9:00 pm
Sky	Clear	Mainly clear	Overcast	Partly cloudy	Clear sky	Clear sky	Clear sky	Clear
Temperature	54°	54°	56°	58°	65°	70°	66°	59°
Chance of rain	0%	0%	0%	0%	0%	0%	0%	0%
Rain	0.00 in	0.00 in	0.00 in	0.00 in	0.00 in	0.00 in	0.00 in	0.00 in
Wind (mph)	2 N	3 SE	2 S	4 SSW	6 SSW	8 SW	5 SSW	7 S
Humidity	65%	89%	92%	88%	79%	58%	57%	76%
UV	0	0	0	1	4	2	0	0
Model	HRRR	HRRR	HRRR	HRRR	HRRR	HRRR	HRRR	HRRR

Do the models agree?

High confidence

The models agree for the next few days: the forecast is fairly solid.

What 6 forecast models say for the next few days. The closer they are, the more reliable the forecast.

HighRainWind

Do the models agree? · High
High (°F)	Today	Fri 30	Sat 31	Sun 1	Mon 2	Tue 3	Wed 4
ECMWF	71°	72°	61°	65°	68°	71°	70°
AIFS	70°	76°	62°	64°	65°	69°	72°
GFS	73°	74°	63°	66°	63°	67°	73°
ICON	71°	76°	63°	66°	73°	78°	75°
HRRR	70°	72°	—	—	—	—	—
NBM	72°	74°	64°	67°	69°	72°	74°
Confidence	high	high	high	high	medium	high	high

Do the models agree? · Rain
Rain	Today	Fri 30	Sat 31	Sun 1	Mon 2	Tue 3	Wed 4
ECMWF	0	0	0	0	0	0	0
AIFS	0	0	0	0	0	0	0
GFS	0	0	0	0	0	0	0
ICON	0	0	0	0	0	0	0
HRRR	0	0	—	—	—	—	—
NBM	0	0	0	0	0	0	0
Confidence	high	high	high	high	high	high	high

Do the models agree? · Wind
Wind (mph)	Today	Fri 30	Sat 31	Sun 1	Mon 2	Tue 3	Wed 4
ECMWF	615	921	615	420	518	420	920
AIFS	6	9	7	3	5	5	6
GFS	511	1222	920	59	510	520	1127
ICON	513	1024	717	514	513	37	820
HRRR	815	1424	—	—	—	—	—
NBM	59	1119	610	57	47	813	917
Confidence	high	high	high	high	high	high	high

Chance of rain from the ensemble models

Model	Today	Fri 30	Sat 31	Sun 1	Mon 2	Tue 3	Wed 4
ECMWF (51 scenarios)	0%	0%	0%	2%	6%	12%	18%
GFS (GEFS, 31 scenarios)	0%	0%	0%	3%	13%	10%	23%
NBM (NOAA)	0%	0%	1%	1%	7%	9%	18%
Thunderstorm (NBM)	0%	0%	0%	0%	1%	1%	1%

Each model's day runs midnight to midnight local time; models that reach fewer days are left blank. Rain: daily total. Wind: the day's highest average wind and, in small type, the strongest gust. Highlighted: values that stand out from the rest. The chance of rain comes from many runs of the same model with slightly different starting data.

Outlook

How the coming weeks and months compare with what is normal for the time of year. It is a trend, not a day-by-day forecast.

Next few weeks, compared with normal: warmer and a bit wetter.

Next 6 weeks

When	TemperatureTemp.	Rain	Typical high / low
Nov 2 – Nov 8Nov 2–Nov 8	Well above +7.4 °F	Above +90%	—
Nov 9 – Nov 15Nov 9–Nov 15	Normal +0.7 °F	Normal	—
Nov 16 – Nov 22Nov 16–Nov 22	A bit above +2.3 °F	Normal	56° / 45°
Nov 23 – Nov 29Nov 23–Nov 29	A bit above +2.3 °F	A bit above +31%	53° / 44°
Nov 30 – Dec 6Nov 30–Dec 6	A bit above +1.8 °F	A bit above +38%	50° / 42°

Coming months

When	TemperatureTemp.	Rain
November	A bit above +1.1 °F	A bit above +27%
December	A bit above +2.0 °F	A bit above +33%
January	A bit above +2.5 °F	A bit above +43%
February	A bit above +1.4 °F	A bit above +46%
March	A bit above +2.0 °F	A bit above +30%

Weeks: ECMWF 46-day (average of its scenarios), against the normal of the last 20 years for those dates. Months: ECMWF SEAS5. Rain: total against normal. The further ahead, the closer it gets to normal and the less detail it can give.

National Harbor climate by monthClimate by month

Normal weather for each month (1991–2020 averages)

The best time to visit National Harbor is from May to June and from August to October: highs of 70 °F to 87 °F, about 9 rainy days a month and 6 hours of sunshine a day.

Hurricane season: from July to September, peaking in July. In the last 30 years (1996–2025), 4 tropical cyclones passed within 93 mi of National Harbor, about one every 10 years. The most recent: Elsa, in July 2021.

45° 28°

JanJ
48° 29°

FebF
57° 36°

MarM
68° 45°

AprA
77° 55°

MayM
85° 64°

JunJ
89° 69°

JulJ
87° 67°

AugA
81° 61°

SepS
70° 49°

OctO
59° 39°

NovN
49° 32°

DecD

Highs and lows
Monthly rainfall
Best time

Month	High	Low	Rain	Rainy daysDays	Sun (h/day)	Water	Waves	Cyclones
JanuaryJan	45°	28°	2.94 in	7	3.8	38°	1.2 ft	–
FebruaryFeb	48°	29°	2.59 in	7	5.1	36°	1.0 ft	–
MarchMar	57°	36°	3.65 in	9	5.5	40°	1.1 ft	–
AprilApr	68°	45°	3.23 in	8	6.3	47°	1.0 ft	–
MayMay	77°	55°	3.81 in	10	7.0	58°	0.8 ft	–
JuneJun	85°	64°	3.91 in	11	7.1	68°	0.8 ft	–
JulyJul	89°	69°	4.13 in	12	7.3	76°	0.7 ft	2
AugustAug	87°	67°	4.21 in	10	6.9	78°	0.7 ft	1
SeptemberSep	81°	61°	4.32 in	9	6.0	74°	0.8 ft	1
OctoberOct	70°	49°	3.44 in	7	5.2	65°	1.1 ft	–
NovemberNov	59°	39°	2.87 in	6	4.3	54°	1.2 ft	–
DecemberDec	49°	32°	3.46 in	8	3.6	45°	1.0 ft	–

Month	Water	Waves	Cyclones
Jan	38°	1.2 ft	–
Feb	36°	1.0 ft	–
Mar	40°	1.1 ft	–
Apr	47°	1.0 ft	–
May	58°	0.8 ft	–
Jun	68°	0.8 ft	–
Jul	76°	0.7 ft	2
Aug	78°	0.7 ft	1
Sep	74°	0.8 ft	1
Oct	65°	1.1 ft	–
Nov	54°	1.2 ft	–
Dec	45°	1.0 ft	–

Days: rainy days in the month. Sun: hours a day.

A normal year brings 42.55 in of rain on about 102 days and about 2,050 hours of sunshine.

Cyclones: how many tropical cyclones (tropical storms, hurricanes and typhoons) passed within 93 mi in each month from 1996 to 2025, according to IBTrACS (NOAA).

1991–2020 averages. Highs, lows and rainfall: TerraClimate; rainy days (0.04 in or more): NASA POWER (MERRA-2); sunshine hours: estimated from solar radiation; water: NOAA OISST; waves (average height): ERA5, 2011–2020. Normals are not a forecast: any given year can turn out very different. Sources and licenses

Temperature

Now55 °Ffeels like 55 °F

Tomorrow53 / 74 °F

It's 55 °F now (feels like 55 °F). Today, 52 °F to 70 °F; tomorrow, 53 °F to 74 °F.

Chance of rain

Today 0%
Fri 30 0%
Sat 31 1%
Sun 1 1%
Mon 2 7%
Tue 3 9%
Wed 4 18%

Today the chance of rain reaches 0%. The next day with likely rain is Thursday 5: 37% and 0.92 in.

No rain in the last 7 days.

Humidity and dew point

Humidity90%

Dew point53 °F

Humidity is 90% now and the dew point is 53 °F. The temperature is very close to the dew point: fog may form.

The dew point is the temperature at which the air becomes saturated: the higher it is, the heavier the air feels.

Visibility and fog

Now8.7 migood

Clouds100%

Visibility is good now (8.7 mi). No fog expected today.

UV index

Now0

Today's peak4moderate

Fri 30: 4 · Sat 31: 4 · Sun 1: 4

Index	Level	What to do
0–2	low	No special protection needed.
3–5	moderate	Hat, sunglasses and sunscreen around midday.
6–7	high	Sunscreen, hat and shade between 12 and 4 pm.
8–10	very high	Avoid the midday sun; reflection off the water adds to it.
11+	extreme	Avoid the sun between 11 am and 5 pm; protect yourself even if it is cloudy.

Reflection off water and sand adds radiation: protect yourself more on a boat or at the beach.

Barometric pressure

↗ Rising Anglers say fish bite less for a while
→ Steady Anglers expect normal activity
↘ Falling · now Anglers say fish feed more before the change

30.2030.40 30.11

Falling now (−0.04 inHg in 3 hours). Over the next 48 hours: +0.09 inHg. Falling pressure: anglers say fish feed more before the change. Fast changes, either way, tend to affect fishing.

Air and pollen

Air qualityModerate · 52

Saharan dustNo

Previous days

The weather over the last 30 days, as the models analyzed it. Tap a day to see it hour by hour.

Day	Sky	Low / high	Max wind
Wed 28	Overcast	46 / 68 °F	4 mph E
Tue 27	Mainly clear	48 / 71 °F	5 mph NE
Mon 26	Mainly clear	40 / 70 °F	5 mph WSW
Sun 25	Overcast	39 / 65 °F	5 mph ENE
Sat 24	Mainly clear	39 / 63 °F	5 mph ENE
Fri 23	Clear sky	48 / 63 °F	8 mph NNE
Thu 22	Clear sky	44 / 68 °F	7 mph NNW

Show all 30 days

Day	Sky	Low / high	Rain	Max wind
Wed 21	Clear sky	46 / 66 °F	0	8 mph N
Tue 20	Clear sky	48 / 70 °F	0	8 mph N
Mon 19	Clear sky	40 / 66 °F	0	6 mph N
Sun 18	Clear sky	41 / 60 °F	0	8 mph NNE
Sat 17	Heavy drizzle	47 / 61 °F	0.28 in	12 mph N
Fri 16	Showers	61 / 82 °F	0.74 in	14 mph SW
Thu 15	Drizzle	61 / 73 °F	0.18 in	11 mph NE
Wed 14	Overcast	63 / 89 °F	0	7 mph SW
Tue 13	Clear sky	55 / 82 °F	0	8 mph SW
Mon 12	Light rain	60 / 74 °F	0.26 in	14 mph NNW
Sun 11	Rain	61 / 69 °F	1.80 in	11 mph NE
Sat 10	Light drizzle	54 / 70 °F	0.01 in	9 mph ENE
Fri 9	Overcast	51 / 76 °F	0	5 mph WNW
Thu 8	Clear sky	55 / 79 °F	0	8 mph WSW
Wed 7	Clear sky	45 / 71 °F	0	8 mph SSW
Tue 6	Clear sky	48 / 65 °F	0	7 mph NNW
Mon 5	Overcast	58 / 73 °F	0	9 mph NW
Sun 4	Drizzle	61 / 66 °F	0.13 in	7 mph NE
Sat 3	Light rain	59 / 69 °F	0.54 in	9 mph NNE
Fri 2	Rain	63 / 88 °F	0.59 in	11 mph SW
Thu 1	Overcast	62 / 85 °F	0	7 mph SSW
Wed 30	Overcast	57 / 80 °F	0	6 mph SSW
Tue 29	Overcast	61 / 75 °F	0	5 mph WNW

These are the models at the start of each day (ECMWF and GFS; waves from Météo-France), not readings from a weather station: there can be differences at specific spots.

Questions about the weather in National HarborQuestions

What's the weather like today in National Harbor?

Overcast, from 52 °F to 70 °F, with a light air from the southwest (2 mph) and a 0% chance of rain.

Will it rain tomorrow in National Harbor?

On Friday 30 the chance of rain is 0% (0.00 in): clear sky.

How warm will it be this week?

Between a low of 47 °F and a high of 74 °F; the warmest day, Friday 30.

What's the UV index today?

It reaches 4 (moderate). Hat, sunglasses and sunscreen around midday.

Is the pressure rising or falling?

It's 30.28 inHg and falling: −0.10 inHg over the last 24 hours.

When is the best time to visit National Harbor?

The best time to visit National Harbor is from May to June and from August to October: highs of 70 °F to 87 °F, about 9 rainy days a month and 6 hours of sunshine a day.

What is the weather like in National Harbor in October?

In October, National Harbor normally sees highs of 70 °F and lows of 49 °F, with about 7 rainy days (3.44 in for the month) and 5 hours of sunshine a day. The sea is around 65 °F. These are 1991–2020 averages.

What are the warmest and wettest months in National Harbor?

The warmest is July, with average highs of 89 °F, and the coldest January, with lows of 28 °F. The wettest is September (4.32 in) and the driest, February.

When is hurricane season in National Harbor?

Hurricane season: from July to September, peaking in July. In the last 30 years (1996–2025), 4 tropical cyclones passed within 93 mi of National Harbor, about one every 10 years. The most recent: Elsa, in July 2021.

More about National Harbor today

Weather near National Harbor

Only places with a different forecast: spots a few miles apart share the same model cell and wouldn't add anything.

Learn more

Weather: Open-Meteo, CC BY 4.0, with the best model for each spot and lead time (NOAA HRRR and NBM in the U.S., Météo-France AROME, DWD ICON-EU, ECMWF IFS and NOAA GFS); ECMWF grid point 2.4 mi away. The comparison also uses ICON (DWD), AIFS (ECMWF) and ARPEGE (Météo-France). Outlook: ECMWF 46-day and SEAS5. Chance of rain from ensemble models (ECMWF, GEFS and NBM). UV, air quality and pollen: CAMS (Copernicus).

Forecast from Open-Meteo (CC BY 4.0) with models from ECMWF, NOAA, Météo-France, DWD, Copernicus Marine and CAMS. Updated at 5:11 am (local time).

Spotted a mistake? Tell us · Where the weather and sea data come from