Water Temperature of Difficult Run in McLean, VA
Current Water Temperature
Measurement Time: Tuesday, October 28, 2025, 8:15 PM EDT
Temperature Locations
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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: 63%
Feels Like: 47.5°F
Wind: NE 8.3 mph
Wind Gusts: 11.7 mph
Precipitation: 0 in
Cloud Cover: 100%
Visibility: 9 mi
UV Index: 0
Five Day Weather Forecast

Wed
H: 61°F
L: 40°F

Thu
H: 62°F
L: 49°F

Fri
H: 60°F
L: 45°F

Sat
H: 60°F
L: 44°F

Sun
H: 61°F
L: 43°F
Air Quality
Nitrogen Dioxide: 9.95 μg/m3
Sulphur Dioxide: 4.35 μg/m3
Ozone: 45 μg/m3
Astronomical
Sun Transit: 12:52 AM
Sunset: 6:12 PM
Daylight: 10 hrs 38 mins
Moon Transit: 7:29 PM
Moonset: 12:24 AM
Moon Phase: First Quarter
Moon Illumination: 52.5%
Best Times for Fishing or Hunting
Major Periods
8:20 AM - 10:50 AM6:59 PM - 9:29 PM
Minor Periods
2:05 PM - 3:35 PM12:00 AM - 12:00 AM
Action Rating: 2 out of 5
Coastal Flood Advisory issued October 28 at 4:25PM EDT until October 29 at 5:00AM EDT by NWS Baltimore MD/Washington DC
Effective: Tue October 28, 2025, 4:25 PM
Expires: Wed October 29, 2025, 12:30 AM
* WHAT...Up to one half foot of inundation above ground level expected in low-lying areas due to tidal flooding. * WHERE...Shoreline in the City of Alexandria and Arlington County. * WHEN...From 10 PM this evening to 5 AM EDT Wednesday, especially around the time of high tide. * IMPACTS...Water is expected to approach the curb near the intersection of King Street and Strand Street in Alexandria. * ADDITIONAL DETAILS...Tides one to one and a half feet above normal. High tide at Alexandria is at 1:46 AM.
If travel is required, allow extra time as some roads may be closed. Do not drive around barricades or through water of unknown depth. Take the necessary actions to protect flood-prone property.
Coastal Flood Advisory issued October 28 at 4:25PM EDT until October 28 at 11:00PM EDT by NWS Baltimore MD/Washington DC
Effective: Tue October 28, 2025, 4:25 PM
Expires: Tue October 28, 2025, 11:00 PM
* WHAT...Up to one half foot of inundation above ground level expected in low-lying areas due to tidal flooding. * WHERE...Shoreline in Charles and King George Counties. * WHEN...Until 11 PM EDT this evening, especially around the time of high tide. * IMPACTS...At 3.5 feet, water reaches yards near Cobb Island and docks near Dahlgren. * ADDITIONAL DETAILS...Tides one and a half to two feet above normal. The next two high tides at Goose Bay are at 9:20 PM this evening and 10:04 AM Wednesday morning. The next two high tides at Dahlgren are at 8:09 PM this evening and 8:35 AM Wednesday morning.
If travel is required, allow extra time as some roads may be closed. Do not drive around barricades or through water of unknown depth. Take the necessary actions to protect flood-prone property.
Coastal Flood Advisory issued October 28 at 4:25PM EDT until October 29 at 4:00AM EDT by NWS Baltimore MD/Washington DC
Effective: Tue October 28, 2025, 4:25 PM
Expires: Wed October 29, 2025, 12:30 AM
* WHAT...For the Coastal Flood Advisory, up to one half foot of inundation above ground level expected in low-lying areas due to tidal flooding. For the Coastal Flood Watch, one to three feet of inundation above ground level possible in low-lying areas due to tidal flooding. * WHERE...Shoreline in Anne Arundel County. * WHEN...For the Coastal Flood Advisory, from 7 PM this evening to 4 AM EDT Wednesday, especially around the time of high tide. For the Coastal Flood Watch, from Wednesday evening through Friday morning, especially around the time of high tide. * IMPACTS...For tonight, tide levels around 3.0 feet are expected which leads to flooding of the Dock Street parking area, and around the Alex Haley Memorial and Compromise Street. For Wednesday night through Thursday night, tide levels around 3.5 to 4.5 feet are possible around times of high tide. At 4.2 feet, the boardwalk at Annapolis City Dock is expected to be underwater, with numerous buildings flooded. Water also will affect several locations near City Dock, including portions of Compromise Street and several streets on the Naval Academy campus. Shoreline inundation up to two feet above ground is likely in other low lying areas. * ADDITIONAL DETAILS...Tides two and a half to three feet above normal. The next high tide at Annapolis U.S. Naval Academy is at 11:22 PM this evening and 10:51 AM Wednesday morning.
If travel is required, allow extra time as some roads may be closed. Do not drive around barricades or through water of unknown depth. Take the necessary actions to protect flood-prone property.
Coastal Flood Watch issued October 28 at 4:25PM EDT until October 31 at 7:00AM EDT by NWS Baltimore MD/Washington DC
Effective: Tue October 28, 2025, 4:25 PM
Expires: Wed October 29, 2025, 12:30 AM
* WHAT...For the Coastal Flood Advisory, up to one half foot of inundation above ground level expected in low-lying areas due to tidal flooding. For the Coastal Flood Watch, one to three feet of inundation above ground level possible in low-lying areas due to tidal flooding. * WHERE...Shoreline in Anne Arundel County. * WHEN...For the Coastal Flood Advisory, from 7 PM this evening to 4 AM EDT Wednesday, especially around the time of high tide. For the Coastal Flood Watch, from Wednesday evening through Friday morning, especially around the time of high tide. * IMPACTS...For tonight, tide levels around 3.0 feet are expected which leads to flooding of the Dock Street parking area, and around the Alex Haley Memorial and Compromise Street. For Wednesday night through Thursday night, tide levels around 3.5 to 4.5 feet are possible around times of high tide. At 4.2 feet, the boardwalk at Annapolis City Dock is expected to be underwater, with numerous buildings flooded. Water also will affect several locations near City Dock, including portions of Compromise Street and several streets on the Naval Academy campus. Shoreline inundation up to two feet above ground is likely in other low lying areas. * ADDITIONAL DETAILS...Tides two and a half to three feet above normal. The next high tide at Annapolis U.S. Naval Academy is at 11:22 PM this evening and 10:51 AM Wednesday morning.
If travel is required, allow extra time as some roads may be closed. Do not drive around barricades or through water of unknown depth. Take the necessary actions to protect flood-prone property.
Weather Forecast
Average Temperature: 50.1°F
Average Humidity: 71%
Wind: 13.2 mph
UV Index: 0.2
Air Quality
Nitrogen Dioxide: 15.26 μg/m3
Sulphur Dioxide: 5.67 μg/m3
Ozone: 42.12 μg/m3
Astronomical
Sun Transit: 12:52 AM
Sunset: 6:12 PM
Daylight: 10 hrs 38 mins
Moon Transit: 7:29 PM
Moonset: 12:24 AM
Moon Phase: First Quarter
Moon Illumination: 52.5%
Best Times for Fishing or Hunting
Major Periods
8:20 AM - 10:50 AM6:59 PM - 9:29 PM
Minor Periods
2:05 PM - 3:35 PM12:00 AM - 12:00 AM
Action Rating: 2 out of 5
Weather Forecast
Average Temperature: 53.7°F
Average Humidity: 91%
Wind: 19.7 mph
UV Index: 0.3
Air Quality
Nitrogen Dioxide: 17.31 μg/m3
Sulphur Dioxide: 5.57 μg/m3
Ozone: 46.16 μg/m3
Astronomical
Sun Transit: 12:52 AM
Sunset: 6:10 PM
Daylight: 10 hrs 36 mins
Moon Transit: 8:17 PM
Moonset: 12:31 AM
Moon Phase: First Quarter
Moon Illumination: 63.7%
Best Times for Fishing or Hunting
Major Periods
9:08 AM - 11:38 AM7:47 PM - 10:17 PM
Minor Periods
2:34 PM - 4:04 PM12:01 AM - 1:31 AM
Action Rating: 2 out of 5
Weather Forecast
Average Temperature: 51.5°F
Average Humidity: 66%
Wind: 17.4 mph
UV Index: 0.7
Air Quality
Nitrogen Dioxide: 7.69 μg/m3
Sulphur Dioxide: 4.73 μg/m3
Ozone: 61.2 μg/m3
Astronomical
Sun Transit: 12:52 AM
Sunset: 6:09 PM
Daylight: 10 hrs 34 mins
Moon Transit: 9:04 PM
Moonset: 1:39 AM
Moon Phase: First Quarter
Moon Illumination: 74.1%
Best Times for Fishing or Hunting
Major Periods
9:56 AM - 12:26 AM8:34 PM - 11:04 PM
Minor Periods
3:01 PM - 4:31 PM1:09 AM - 2:39 AM
Action Rating: 2 out of 5
Weather Forecast
Average Temperature: 50.8°F
Average Humidity: 56%
Wind: 13.2 mph
UV Index: 0.7
Air Quality
Nitrogen Dioxide: 7.49 μg/m3
Sulphur Dioxide: 6.67 μg/m3
Ozone: 62.54 μg/m3
Astronomical
Sun Transit: 12:52 AM
Sunset: 6:08 PM
Daylight: 10 hrs 32 mins
Moon Transit: 9:51 PM
Moonset: 2:49 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 83.4%
Best Times for Fishing or Hunting
Major Periods
10:43 AM - 1:13 PM9:21 PM - 11:51 PM
Minor Periods
3:26 PM - 4:56 PM2:19 AM - 3:49 AM
Action Rating: 2 out of 5
Weather Forecast
Average Temperature: 48.8°F
Average Humidity: 64%
Wind: 2.9 mph
UV Index: 0
Air Quality
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3
Astronomical
Sun Transit: 12:52 AM
Sunset: 6:07 PM
Daylight: 10 hrs 29 mins
Moon Transit: 12:31 AM
Moonset: 3:59 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 90.9%
Best Times for Fishing or Hunting
Major Periods
11:31 AM - 2:01 PM12:01 AM - 2:31 PM
Minor Periods
3:51 PM - 5:21 PM3:29 AM - 4:59 AM
Action Rating: 2 out of 5
