Water Temperature of Difficult Run in McLean, VA

Current Water Temperature

50.0°F

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, VA

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Difficult Run

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

50.7°F
Overcast
Conditions: Overcast
Humidity: 63%
Feels Like: 47.5°F
Wind: NE 8.3 mph
Wind Gusts: 11.7 mph
Pressure: 30.16 in
Precipitation: 0 in
Cloud Cover: 100%
Visibility: 9 mi
UV Index: 0

Five Day Weather Forecast

Patchy rain nearby
Wed
H: 61°F
L: 40°F
Heavy rain
Thu
H: 62°F
L: 49°F
Sunny
Fri
H: 60°F
L: 45°F
Sunny
Sat
H: 60°F
L: 44°F
Sunny
Sun
H: 61°F
L: 43°F

Air Quality

PM2.5: 3.35 μg/m3
PM10: 3.45 μg/m3
Carbon Monoxide: 183.85 μg/m3
Nitrogen Dioxide: 9.95 μg/m3
Sulphur Dioxide: 4.35 μg/m3
Ozone: 45 μg/m3

Astronomical

Sunrise: 7:33 AM
Sun Transit: 12:52 AM
Sunset: 6:12 PM
Daylight: 10 hrs 38 mins
Moonrise: 2:35 PM
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 AM
6:59 PM - 9:29 PM

Minor Periods

2:05 PM - 3:35 PM
12:00 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.


Wednesday, October 29, 2025

Weather Forecast

Conditions: Patchy rain nearby
Average Temperature: 50.1°F
Average Humidity: 71%
Chance of Rain: 87%
Wind: 13.2 mph
UV Index: 0.2

Air Quality

AQI: 1 - Good
PM2.5: 4.96 μg/m3
PM10: 5.31 μg/m3
Carbon Monoxide: 215.41 μg/m3
Nitrogen Dioxide: 15.26 μg/m3
Sulphur Dioxide: 5.67 μg/m3
Ozone: 42.12 μg/m3

Astronomical

Sunrise: 7:33 AM
Sun Transit: 12:52 AM
Sunset: 6:12 PM
Daylight: 10 hrs 38 mins
Moonrise: 2:35 PM
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 AM
6:59 PM - 9:29 PM

Minor Periods

2:05 PM - 3:35 PM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Thursday, October 30, 2025

Weather Forecast

Conditions: Heavy rain
Average Temperature: 53.7°F
Average Humidity: 91%
Chance of Rain: 87%
Wind: 19.7 mph
UV Index: 0.3

Air Quality

AQI: 1 - Good
PM2.5: 5.3 μg/m3
PM10: 5.73 μg/m3
Carbon Monoxide: 162.13 μg/m3
Nitrogen Dioxide: 17.31 μg/m3
Sulphur Dioxide: 5.57 μg/m3
Ozone: 46.16 μg/m3

Astronomical

Sunrise: 7:34 AM
Sun Transit: 12:52 AM
Sunset: 6:10 PM
Daylight: 10 hrs 36 mins
Moonrise: 3:04 PM
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 AM
7:47 PM - 10:17 PM

Minor Periods

2:34 PM - 4:04 PM
12:01 AM - 1:31 AM

Action Rating: 2 out of 5

Friday, October 31, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 51.5°F
Average Humidity: 66%
Chance of Rain: 0%
Wind: 17.4 mph
UV Index: 0.7

Air Quality

AQI: 1 - Good
PM2.5: 3.22 μg/m3
PM10: 3.23 μg/m3
Carbon Monoxide: 166.41 μg/m3
Nitrogen Dioxide: 7.69 μg/m3
Sulphur Dioxide: 4.73 μg/m3
Ozone: 61.2 μg/m3

Astronomical

Sunrise: 7:35 AM
Sun Transit: 12:52 AM
Sunset: 6:09 PM
Daylight: 10 hrs 34 mins
Moonrise: 3:31 PM
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 AM
8:34 PM - 11:04 PM

Minor Periods

3:01 PM - 4:31 PM
1:09 AM - 2:39 AM

Action Rating: 2 out of 5

Saturday, November 1, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 50.8°F
Average Humidity: 56%
Chance of Rain: 0%
Wind: 13.2 mph
UV Index: 0.7

Air Quality

AQI: 1 - Good
PM2.5: 4.88 μg/m3
PM10: 4.88 μg/m3
Carbon Monoxide: 167.77 μg/m3
Nitrogen Dioxide: 7.49 μg/m3
Sulphur Dioxide: 6.67 μg/m3
Ozone: 62.54 μg/m3

Astronomical

Sunrise: 7:36 AM
Sun Transit: 12:52 AM
Sunset: 6:08 PM
Daylight: 10 hrs 32 mins
Moonrise: 3:56 PM
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 PM
9:21 PM - 11:51 PM

Minor Periods

3:26 PM - 4:56 PM
2:19 AM - 3:49 AM

Action Rating: 2 out of 5

Sunday, November 2, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 48.8°F
Average Humidity: 64%
Chance of Rain: 0%
Wind: 2.9 mph
UV Index: 0

Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 7:38 AM
Sun Transit: 12:52 AM
Sunset: 6:07 PM
Daylight: 10 hrs 29 mins
Moonrise: 4:21 PM
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 PM
12:01 AM - 2:31 PM

Minor Periods

3:51 PM - 5:21 PM
3:29 AM - 4:59 AM

Action Rating: 2 out of 5

The times presented here are based upon the solunar theory, which is the idea that the movements of fish and other animals are affected by the location of the sun and moon. The major periods are believed to be the times of the greatest animal activity and occur when the moon is directly overhead or underfoot (lunar transits). The minor periods also see increased activity and occur when the moon is rising or setting. The strongest activity occurs during full or new moons, and the weakest during quarter or three quarter moons. This is indicated by the Action Rating.

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