Water Temperature of Difficult Run in McLean, VA
Current Water Temperature
Measurement Time: Wednesday, June 25, 2025, 12:15 AM 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: 94%
Feels Like: 77.8°F
Wind: NW 4.5 mph
Wind Gusts: 9.4 mph
Precipitation: 0 in
Cloud Cover: 0%
Visibility: 9 mi
UV Index: 0
Five Day Weather Forecast

Wed
H: 102°F
L: 78°F

Thu
H: 100°F
L: 73°F

Fri
H: 96°F
L: 73°F

Sat
H: 93°F
L: 69°F

Sun
H: 88°F
L: 70°F
Air Quality
Nitrogen Dioxide: 14.43 μg/m3
Sulphur Dioxide: 18.69 μg/m3
Ozone: 104 μg/m3
Astronomical
Sun Transit: 1:11 PM
Sunset: 8:39 PM
Daylight: 14 hrs 54 mins
Moon Transit: 1:30 PM
Moonset: 9:29 PM
Moon Phase: New
Moon Illumination: 1.6%
Best Times for Fishing or Hunting
Major Periods
2:14 AM - 4:44 AM1:00 PM - 3:30 PM
Minor Periods
8:59 PM - 10:29 PM4:57 AM - 6:27 AM
Action Rating: 4 out of 5
Heat Advisory issued June 24 at 8:43PM EDT until June 25 at 9:00PM EDT by NWS Baltimore MD/Washington DC
Effective: Tue June 24, 2025, 8:43 PM
Expires: Wed June 25, 2025, 4:45 AM
* WHAT...Heat index values up to 108 expected. * WHERE...Portions of DC, central, north central, northeast, northern, and southern Maryland, central, northern, and northwest Virginia, and panhandle West Virginia. * WHEN...From 11 AM to 9 PM EDT Wednesday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.
Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke.
Extreme Heat Warning issued June 24 at 5:23PM EDT until June 24 at 9:00PM EDT by NWS Baltimore MD/Washington DC
Effective: Tue June 24, 2025, 5:23 PM
Expires: Wed June 25, 2025, 1:30 AM
* WHAT...For the Extreme Heat Warning, dangerously hot conditions with heat index values up to 111. For the Heat Advisory, heat index values up to 108 expected. * WHERE...Portions of DC, central, north central, northeast, northern, and southern Maryland, and central, northern, and northwest Virginia. * WHEN...For the Extreme Heat Warning, until 9 PM EDT this evening. For the Heat Advisory, from 11 AM to 9 PM EDT Wednesday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. Hot temperatures and high humidity may cause heat illnesses.
Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke.
Heat Advisory issued June 24 at 5:23PM EDT until June 25 at 9:00PM EDT by NWS Baltimore MD/Washington DC
Effective: Tue June 24, 2025, 5:23 PM
Expires: Wed June 25, 2025, 1:30 AM
* WHAT...For the Extreme Heat Warning, dangerously hot conditions with heat index values up to 111. For the Heat Advisory, heat index values up to 108 expected. * WHERE...Portions of DC, central, north central, northeast, northern, and southern Maryland, and central, northern, and northwest Virginia. * WHEN...For the Extreme Heat Warning, until 9 PM EDT this evening. For the Heat Advisory, from 11 AM to 9 PM EDT Wednesday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. Hot temperatures and high humidity may cause heat illnesses.
Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke.
Heat Advisory issued June 24 at 8:43PM EDT until June 25 at 9:00PM EDT by NWS Baltimore MD/Washington DC
Effective: Tue June 24, 2025, 8:43 PM
Expires: Wed June 25, 2025, 4:45 AM
* WHAT...Heat index values up to 108 expected. * WHERE...Portions of DC, central, north central, northeast, northern, and southern Maryland, central, northern, and northwest Virginia, and panhandle West Virginia. * WHEN...From 11 AM to 9 PM EDT Wednesday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.
Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke.
Extreme Heat Warning issued June 24 at 5:23PM EDT until June 24 at 9:00PM EDT by NWS Baltimore MD/Washington DC
Effective: Tue June 24, 2025, 5:23 PM
Expires: Wed June 25, 2025, 1:30 AM
* WHAT...For the Extreme Heat Warning, dangerously hot conditions with heat index values up to 111. For the Heat Advisory, heat index values up to 108 expected. * WHERE...Portions of DC, central, north central, northeast, northern, and southern Maryland, and central, northern, and northwest Virginia. * WHEN...For the Extreme Heat Warning, until 9 PM EDT this evening. For the Heat Advisory, from 11 AM to 9 PM EDT Wednesday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. Hot temperatures and high humidity may cause heat illnesses.
Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke.
Weather Forecast
Average Temperature: 89.2°F
Average Humidity: 65%
Wind: 9.4 mph
UV Index: 2.6
Air Quality
Nitrogen Dioxide: 16.91 μg/m3
Sulphur Dioxide: 15.38 μg/m3
Ozone: 114.28 μg/m3
Astronomical
Sun Transit: 1:11 PM
Sunset: 8:39 PM
Daylight: 14 hrs 54 mins
Moon Transit: 1:30 PM
Moonset: 9:29 PM
Moon Phase: New
Moon Illumination: 1.6%
Best Times for Fishing or Hunting
Major Periods
2:14 AM - 4:44 AM1:00 PM - 3:30 PM
Minor Periods
8:59 PM - 10:29 PM4:57 AM - 6:27 AM
Action Rating: 4 out of 5
Weather Forecast
Average Temperature: 86°F
Average Humidity: 73%
Wind: 10.5 mph
UV Index: 2.5
Air Quality
Nitrogen Dioxide: 21.29 μg/m3
Sulphur Dioxide: 12.27 μg/m3
Ozone: 111.48 μg/m3
Astronomical
Sun Transit: 1:12 PM
Sunset: 8:39 PM
Daylight: 14 hrs 54 mins
Moon Transit: 2:31 PM
Moonset: 10:16 PM
Moon Phase: New
Moon Illumination: 0.1%
Best Times for Fishing or Hunting
Major Periods
3:18 AM - 5:48 AM2:01 PM - 4:31 PM
Minor Periods
9:46 PM - 11:16 PM6:09 AM - 7:39 AM
Action Rating: 5 out of 5
Weather Forecast
Average Temperature: 83.3°F
Average Humidity: 77%
Wind: 7.8 mph
UV Index: 1.3
Air Quality
Nitrogen Dioxide: 20.34 μg/m3
Sulphur Dioxide: 8.26 μg/m3
Ozone: 99.68 μg/m3
Astronomical
Sun Transit: 1:12 PM
Sunset: 8:39 PM
Daylight: 14 hrs 54 mins
Moon Transit: 3:28 PM
Moonset: 10:53 PM
Moon Phase: New
Moon Illumination: 2.0%
Best Times for Fishing or Hunting
Major Periods
4:16 AM - 6:46 AM2:58 PM - 5:28 PM
Minor Periods
10:23 PM - 11:53 PM7:22 AM - 8:52 AM
Action Rating: 3 out of 5
Weather Forecast
Average Temperature: 76.9°F
Average Humidity: 84%
Wind: 8.7 mph
UV Index: 2.5
Air Quality
Nitrogen Dioxide: 28.96 μg/m3
Sulphur Dioxide: 8.87 μg/m3
Ozone: 73.62 μg/m3
Astronomical
Sun Transit: 1:12 PM
Sunset: 8:39 PM
Daylight: 14 hrs 53 mins
Moon Transit: 4:19 PM
Moonset: 11:23 PM
Moon Phase: Waxing Crescent
Moon Illumination: 6.5%
Best Times for Fishing or Hunting
Major Periods
5:10 AM - 7:40 AM3:49 PM - 6:19 PM
Minor Periods
12:00 AM - 12:00 AM8:34 AM - 10:04 AM
Action Rating: 2 out of 5
Weather Forecast
Average Temperature: 76.4°F
Average Humidity: 85%
Wind: 6.9 mph
UV Index: 0.2
Air Quality
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3
Astronomical
Sun Transit: 1:12 PM
Sunset: 8:39 PM
Daylight: 14 hrs 53 mins
Moon Transit: 5:05 PM
Moonset: 12:23 AM
Moon Phase: Waxing Crescent
Moon Illumination: 13.1%
Best Times for Fishing or Hunting
Major Periods
5:58 AM - 8:28 AM4:35 PM - 7:05 PM
Minor Periods
9:42 AM - 11:12 AM12:00 AM - 12:00 AM
Action Rating: 3 out of 5