Weather in National Harbor, MD
National Harbor, Sunday, 9 August, 10:48
Overcast. Feels like 95°. High 93°, low 74°.
Monthly outlook for National Harbor, MD: average high 87.5°, average low 68.6°. That is 1.7° above the climate normal for August. Precipitation is expected on 2 days (about 0.7 inches), against a normal of 6 days and 2.0 inches. The warmest day looks like 10 August (95.1°), the coolest 15 August (60.7°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 August – 18 August | 87° | 85.1° | +1.1° |
| 19 August – 28 August | 88.3° | 83.7° | +2.5° |
| 29 August – 7 September | at normal | 82.6° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — Forest Heights (2 mi).
0
National Harbor, Monday, 10 August
Clear. High 95°, low 76°.
0.03
National Harbor, Tuesday, 11 August
Light rain. High 91°, low 71°.
0National Harbor, Wednesday, 12 August
Overcast. High 89°, low 74°.
0
National Harbor, Thursday, 13 August
Partly cloudy. High 91°, low 74°.
0.22National Harbor, Friday, 14 August
Rain. High 73°, low 62°.
0National Harbor, Saturday, 15 August
Overcast. High 82°, low 61°.
0.01National Harbor, Sunday, 16 August
Light rain. High 82°, low 61°.
0.01National Harbor, Monday, 17 August
Light rain. High 87°, low 67°.
0National Harbor, Tuesday, 18 August
Partly cloudy. High 89°, low 67°.
0.41National Harbor, Wednesday, 19 August
Rain. High 86°, low 68°.
0National Harbor, Thursday, 20 August
Clear. High 88°, low 67°.
0National Harbor, Friday, 21 August
Overcast. High 85°, low 67°.
0National Harbor, Saturday, 22 August
Clear. High 93°, low 67°.
0National Harbor, Sunday, 23 August
Partly cloudy. High 91°, low 75°.
0National Harbor, Monday, 24 August
Clear. High 85°, low 67°.
0.08National Harbor, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.05
National Harbor, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.13National Harbor, Thursday, 27 August
Climate normal for this date — 60-year average.
0.16
National Harbor, Friday, 28 August
Climate normal for this date — 60-year average.
0.11National Harbor, Saturday, 29 August
Climate normal for this date — 60-year average.
0.05National Harbor, Sunday, 30 August
Climate normal for this date — 60-year average.
0.07National Harbor, Monday, 31 August
Climate normal for this date — 60-year average.
0.15National Harbor, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.09National Harbor, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.11National Harbor, Thursday, 3 September
Climate normal for this date — 60-year average.
0.09National Harbor, Friday, 4 September
Climate normal for this date — 60-year average.
0.14National Harbor, Saturday, 5 September
Climate normal for this date — 60-year average.
0.22National Harbor, Sunday, 6 September
Climate normal for this date — 60-year average.
0.08National Harbor, Monday, 7 September
Climate normal for this date — 60-year average.
About the monthly outlook
How accurate is a 30-day forecast?
The first 16 days come from weather models — reliable for the first 3–5 days and progressively less so after that. Days 17 through 30 for National Harbor, MD are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.
What does "above normal" mean?
We compare the forecast against the climate normal for those exact calendar days, computed from 60 years of observations. The deviation shows how much the coming month differs from a typical one.
Where do the 66-year records come from?
They are real temperature extremes recorded in National Harbor, MD since 1960: the highest and lowest reading for each calendar date, with the year it happened.
How often is it updated?
The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.
Sun and moon today
Weather history
80°Weather in Annapolis, MD85°Weather in Atlanta, GA87°Weather in Augusta, ME81°Weather in Austin, TX84°Weather in Baton Rouge, LA87°Weather in Bismarck, ND66°Weather in Boise, ID65°Weather in Boston, MA85°Weather in Carson City, NV76°Weather in Charleston, WV81°Weather in Charlotte Amalie, VI84°Weather in Cheyenne, WY76°Weather in Columbia, SC85°Weather in Columbus, OH79°Weather in Concord, NH82°Weather in Denver, CO84°Weather in Des Moines, IA79°Weather in Dover, DE87°Weather in Frankfort, KY82°Weather in Harrisburg, PA84°Weather in Hartford, CT84°Weather in Helena, MT62°Weather in Honolulu, HI75°Weather in Indianapolis, IN80°Weather in Jackson, MS88°Weather in Jefferson City, MO82°Weather in Juneau, AK47°Weather in Lansing, MI73°Weather in Lincoln, NE86°Weather in Little Rock, AR82°Weather in Madison, WI69°Weather in Montgomery, AL84°Weather in Montpelier, VT77°Weather in Nashville, TN78°Weather in Oklahoma City, OK81°Weather in Olympia, WA56°Weather in Phoenix, AZ92°Weather in Pierre, SD71°Weather in Providence, RI85°Weather in Raleigh, NC85°Weather in Richmond, VA87°Weather in Sacramento, CA67°Weather in Salem, OR61°Weather in Salt Lake City, UT84°Weather in San Juan, PR87°Weather in Santa Fe, NM74°Weather in Springfield, IL81°Weather in St. Paul, MN71°Weather in Tallahassee, FL82°Weather in Topeka, KS81°Weather in Trenton, NJ85°Weather in Washington, DC87°83°Weather in Bishopville, MD85°Weather in Abingdon, MD85°Weather in Arundel Village, MD85°Weather in Ashton, MD83°Weather in Barber, MD85°Weather in Bay Ridge, MD85°Weather in Bay View, MD83°Weather in Bayside Beach, MD85°Weather in Bellevue, MD85°Weather in Bethlehem, MD87°Weather in Beverly Beach, MD86°Weather in Birdsville, MD86°Weather in Boyds, MD84°Weather in Chaneyville, MD86°Weather in Chesterville, MD85°Weather in Claiborne, MD86°Weather in Cloverly, MD84°Weather in Coleman, MD86°Weather in Creswell, MD86°