Water Temperature of Difficult Run in McLean, VA
Current Water Temperature
Measurement Time: Saturday, September 6, 2025, 2:15 PM EDT
Temperature Locations
View Nearby Locations View All Virginia Locations View Locations Near Me
Local Points of Interest
Great Falls Park; Great Falls, VASponsored Content
Station Name: DIFFICULT RUN NEAR GREAT FALLS, VA
Data Source: Water Data - usgc.gov
Elevation Above Sea Level: 184 feet / 56 meters
Nearest Address:
9200 Old Dominion Dr
McLean, VA 22102
Fairfax County
GPS Coordinates: 38.97594346, -77.24581439
Nearby Water Temperatures
Dead Run, McLean, VA (3.9 mi)Difficult Run, Oakton, VA (7.8 mi)
Sligo Creek, Takoma Park, MD (13.0 mi)
Washington Channel, Washington, DC (14.0 mi)
Paint Branch, Calverton, MD (15.6 mi)
Northeast Branch Anacostia River, Riverdale Park, MD (17.2 mi)
Patuxent River, Brighton, MD (19.8 mi)
Potomac River, Point of Rocks, MD (26.0 mi)
Carroll Creek, Frederick, MD (32.5 mi)
Carroll Creek, Frederick, MD (33.5 mi)
Scotts Level Branch, Milford Mill, MD (37.2 mi)
Northwest Harbor, Baltimore, MD (41.0 mi)
Spout Run, Boyce, VA (41.2 mi)
Severn River, Annapolis, MD (41.2 mi)
Chesapeake Bay, Annapolis, MD (42.9 mi)
Weather for McLean, Virginia
Current Weather

Humidity: 58%
Feels Like: 87.1°F
Wind: NNE 6.5 mph
Wind Gusts: 10.3 mph
Precipitation: 0 in
Cloud Cover: 86%
Visibility: 6 mi
UV Index: 0
Five Day Weather Forecast

Sat
H: 93°F
L: 72°F

Sun
H: 77°F
L: 66°F

Mon
H: 75°F
L: 56°F

Tue
H: 81°F
L: 56°F

Wed
H: 78°F
L: 58°F
Air Quality
Nitrogen Dioxide: 14.8 μg/m3
Sulphur Dioxide: 5.74 μg/m3
Ozone: 65 μg/m3
Astronomical
Sun Transit: 1:07 PM
Sunset: 7:31 PM
Daylight: 12 hrs 48 mins
Moon Transit: 12:00 AM
Moonset: 5:12 AM
Moon Phase: Full
Moon Illumination: 99.5%
Best Times for Fishing or Hunting
Major Periods
12:00 AM - 12:00 AM1:31 PM - 4:01 PM
Minor Periods
6:37 PM - 8:07 PM4:42 AM - 6:12 AM
Action Rating: 3 out of 5
Severe Thunderstorm Watch issued September 6 at 1:25PM EDT until September 6 at 8:00PM EDT by NWS Baltimore MD/Washington DC
Effective: Sat September 6, 2025, 1:25 PM
Expires: Sat September 6, 2025, 8:00 PM
THE NATIONAL WEATHER SERVICE HAS ISSUED SEVERE THUNDERSTORM WATCH 607 IN EFFECT UNTIL 8 PM EDT THIS EVENING FOR THE FOLLOWING AREAS IN MARYLAND THIS WATCH INCLUDES 7 COUNTIES IN CENTRAL MARYLAND ANNE ARUNDEL HOWARD IN NORTH CENTRAL MARYLAND CARROLL IN NORTHEAST MARYLAND CECIL IN NORTHERN MARYLAND BALTIMORE BALTIMORE CITY HARFORD THIS INCLUDES THE CITIES OF ABERDEEN, ANNAPOLIS, ARNOLD, BALTIMORE, BEL AIR, CATONSVILLE, COLUMBIA, DUNDALK, EDGEWOOD, ELDERSBURG, ELKTON, ELLICOTT CITY, ESSEX, FALLSTON, GLEN BURNIE, HAVRE DE GRACE, JOPPATOWNE, ODENTON, PARKVILLE, PIKESVILLE, RANDALLSTOWN, SEVERN, SEVERNA PARK, SOUTH GATE, TOWSON, AND WESTMINSTER.
Severe Thunderstorm Watch issued September 6 at 1:25PM EDT until September 6 at 8:00PM EDT by NWS Baltimore MD/Washington DC
Effective: Sat September 6, 2025, 1:25 PM
Expires: Sat September 6, 2025, 8:00 PM
THE NATIONAL WEATHER SERVICE HAS ISSUED SEVERE THUNDERSTORM WATCH 607 IN EFFECT UNTIL 8 PM EDT THIS EVENING FOR THE FOLLOWING AREAS IN MARYLAND THIS WATCH INCLUDES 7 COUNTIES IN CENTRAL MARYLAND ANNE ARUNDEL HOWARD IN NORTH CENTRAL MARYLAND CARROLL IN NORTHEAST MARYLAND CECIL IN NORTHERN MARYLAND BALTIMORE BALTIMORE CITY HARFORD THIS INCLUDES THE CITIES OF ABERDEEN, ANNAPOLIS, ARNOLD, BALTIMORE, BEL AIR, CATONSVILLE, COLUMBIA, DUNDALK, EDGEWOOD, ELDERSBURG, ELKTON, ELLICOTT CITY, ESSEX, FALLSTON, GLEN BURNIE, HAVRE DE GRACE, JOPPATOWNE, ODENTON, PARKVILLE, PIKESVILLE, RANDALLSTOWN, SEVERN, SEVERNA PARK, SOUTH GATE, TOWSON, AND WESTMINSTER.
Severe Thunderstorm Watch issued September 6 at 1:25PM EDT until September 6 at 8:00PM EDT by NWS Baltimore MD/Washington DC
Effective: Sat September 6, 2025, 1:25 PM
Expires: Sat September 6, 2025, 8:00 PM
THE NATIONAL WEATHER SERVICE HAS ISSUED SEVERE THUNDERSTORM WATCH 607 IN EFFECT UNTIL 8 PM EDT THIS EVENING FOR THE FOLLOWING AREAS IN MARYLAND THIS WATCH INCLUDES 7 COUNTIES IN CENTRAL MARYLAND ANNE ARUNDEL HOWARD IN NORTH CENTRAL MARYLAND CARROLL IN NORTHEAST MARYLAND CECIL IN NORTHERN MARYLAND BALTIMORE BALTIMORE CITY HARFORD THIS INCLUDES THE CITIES OF ABERDEEN, ANNAPOLIS, ARNOLD, BALTIMORE, BEL AIR, CATONSVILLE, COLUMBIA, DUNDALK, EDGEWOOD, ELDERSBURG, ELKTON, ELLICOTT CITY, ESSEX, FALLSTON, GLEN BURNIE, HAVRE DE GRACE, JOPPATOWNE, ODENTON, PARKVILLE, PIKESVILLE, RANDALLSTOWN, SEVERN, SEVERNA PARK, SOUTH GATE, TOWSON, AND WESTMINSTER.
Severe Thunderstorm Watch issued September 6 at 1:25PM EDT until September 6 at 8:00PM EDT by NWS Baltimore MD/Washington DC
Effective: Sat September 6, 2025, 1:25 PM
Expires: Sat September 6, 2025, 8:00 PM
THE NATIONAL WEATHER SERVICE HAS ISSUED SEVERE THUNDERSTORM WATCH 607 IN EFFECT UNTIL 8 PM EDT THIS EVENING FOR THE FOLLOWING AREAS IN MARYLAND THIS WATCH INCLUDES 7 COUNTIES IN CENTRAL MARYLAND ANNE ARUNDEL HOWARD IN NORTH CENTRAL MARYLAND CARROLL IN NORTHEAST MARYLAND CECIL IN NORTHERN MARYLAND BALTIMORE BALTIMORE CITY HARFORD THIS INCLUDES THE CITIES OF ABERDEEN, ANNAPOLIS, ARNOLD, BALTIMORE, BEL AIR, CATONSVILLE, COLUMBIA, DUNDALK, EDGEWOOD, ELDERSBURG, ELKTON, ELLICOTT CITY, ESSEX, FALLSTON, GLEN BURNIE, HAVRE DE GRACE, JOPPATOWNE, ODENTON, PARKVILLE, PIKESVILLE, RANDALLSTOWN, SEVERN, SEVERNA PARK, SOUTH GATE, TOWSON, AND WESTMINSTER.
Weather Forecast
Average Temperature: 79.6°F
Average Humidity: 69%
Wind: 13.2 mph
UV Index: 1.4
Air Quality
Nitrogen Dioxide: 20.23 μg/m3
Sulphur Dioxide: 7.42 μg/m3
Ozone: 95.68 μg/m3
Astronomical
Sun Transit: 1:07 PM
Sunset: 7:31 PM
Daylight: 12 hrs 48 mins
Moon Transit: 12:00 AM
Moonset: 5:12 AM
Moon Phase: Full
Moon Illumination: 99.5%
Best Times for Fishing or Hunting
Major Periods
12:00 AM - 12:00 AM1:31 PM - 4:01 PM
Minor Periods
6:37 PM - 8:07 PM4:42 AM - 6:12 AM
Action Rating: 3 out of 5
Weather Forecast
Average Temperature: 70.6°F
Average Humidity: 51%
Wind: 7.4 mph
UV Index: 0.7
Air Quality
Nitrogen Dioxide: 14.7 μg/m3
Sulphur Dioxide: 8.72 μg/m3
Ozone: 70.8 μg/m3
Astronomical
Sun Transit: 1:06 PM
Sunset: 7:29 PM
Daylight: 12 hrs 46 mins
Moon Transit: 12:40 AM
Moonset: 6:25 AM
Moon Phase: Full
Moon Illumination: 99.8%
Best Times for Fishing or Hunting
Major Periods
12:10 AM - 2:40 AM2:20 PM - 4:50 PM
Minor Periods
7:03 PM - 8:33 PM5:55 AM - 7:25 AM
Action Rating: 4 out of 5
Weather Forecast
Average Temperature: 66°F
Average Humidity: 49%
Wind: 5.8 mph
UV Index: 1.7
Air Quality
Nitrogen Dioxide: 19.4 μg/m3
Sulphur Dioxide: 5.91 μg/m3
Ozone: 74.64 μg/m3
Astronomical
Sun Transit: 1:06 PM
Sunset: 7:28 PM
Daylight: 12 hrs 43 mins
Moon Transit: 3:28 PM
Moonset: 7:37 AM
Moon Phase: Full
Moon Illumination: 97.6%
Best Times for Fishing or Hunting
Major Periods
2:58 PM - 5:28 PM2:58 PM - 5:28 PM
Minor Periods
7:28 PM - 8:58 PM7:07 AM - 8:37 AM
Action Rating: 5 out of 5
Weather Forecast
Average Temperature: 67.1°F
Average Humidity: 55%
Wind: 9.2 mph
UV Index: 1.6
Air Quality
Nitrogen Dioxide: 39.21 μg/m3
Sulphur Dioxide: 10.7 μg/m3
Ozone: 74.52 μg/m3
Astronomical
Sun Transit: 1:06 PM
Sunset: 7:26 PM
Daylight: 12 hrs 41 mins
Moon Transit: 2:17 AM
Moonset: 8:51 AM
Moon Phase: Full
Moon Illumination: 93.0%
Best Times for Fishing or Hunting
Major Periods
1:47 AM - 4:17 AM3:58 PM - 6:28 PM
Minor Periods
7:54 PM - 9:24 PM8:21 AM - 9:51 AM
Action Rating: 4 out of 5
Weather Forecast
Average Temperature: 66.8°F
Average Humidity: 61%
Wind: 7.2 mph
UV Index: 0
Air Quality
Nitrogen Dioxide: 34.92 μg/m3
Sulphur Dioxide: 8.07 μg/m3
Ozone: 50.38 μg/m3
Astronomical
Sun Transit: 1:05 PM
Sunset: 7:25 PM
Daylight: 12 hrs 38 mins
Moon Transit: 3:08 AM
Moonset: 10:06 AM
Moon Phase: Waning Gibbous
Moon Illumination: 86.2%
Best Times for Fishing or Hunting
Major Periods
2:38 AM - 5:08 AM4:49 PM - 7:19 PM
Minor Periods
8:23 PM - 9:53 PM9:36 AM - 11:06 AM
Action Rating: 3 out of 5