Water Temperature of Difficult Run in McLean, VA

Current Water Temperature

79.2°F

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, 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

73.9°F
Clear
Conditions: Clear
Humidity: 94%
Feels Like: 77.8°F
Wind: NW 4.5 mph
Wind Gusts: 9.4 mph
Pressure: 30.09 in
Precipitation: 0 in
Cloud Cover: 0%
Visibility: 9 mi
UV Index: 0

Five Day Weather Forecast

Sunny
Wed
H: 102°F
L: 78°F
Patchy rain nearby
Thu
H: 100°F
L: 73°F
Cloudy
Fri
H: 96°F
L: 73°F
Moderate rain
Sat
H: 93°F
L: 69°F
Patchy rain nearby
Sun
H: 88°F
L: 70°F

Air Quality

PM2.5: 39.59 μg/m3
PM10: 43.66 μg/m3
Carbon Monoxide: 434.75 μg/m3
Nitrogen Dioxide: 14.43 μg/m3
Sulphur Dioxide: 18.69 μg/m3
Ozone: 104 μg/m3

Astronomical

Sunrise: 5:45 AM
Sun Transit: 1:11 PM
Sunset: 8:39 PM
Daylight: 14 hrs 54 mins
Moonrise: 5:27 AM
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 AM
1:00 PM - 3:30 PM

Minor Periods

8:59 PM - 10:29 PM
4:57 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.


Wednesday, June 25, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 89.2°F
Average Humidity: 65%
Chance of Rain: 0%
Wind: 9.4 mph
UV Index: 2.6

Air Quality

AQI: 2 - Moderate
PM2.5: 35.53 μg/m3
PM10: 39.37 μg/m3
Carbon Monoxide: 405.45 μg/m3
Nitrogen Dioxide: 16.91 μg/m3
Sulphur Dioxide: 15.38 μg/m3
Ozone: 114.28 μg/m3

Astronomical

Sunrise: 5:45 AM
Sun Transit: 1:11 PM
Sunset: 8:39 PM
Daylight: 14 hrs 54 mins
Moonrise: 5:27 AM
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 AM
1:00 PM - 3:30 PM

Minor Periods

8:59 PM - 10:29 PM
4:57 AM - 6:27 AM

Action Rating: 4 out of 5

Thursday, June 26, 2025

Weather Forecast

Conditions: Patchy rain nearby
Average Temperature: 86°F
Average Humidity: 73%
Chance of Rain: 83%
Wind: 10.5 mph
UV Index: 2.5

Air Quality

AQI: 2 - Moderate
PM2.5: 40.17 μg/m3
PM10: 42.45 μg/m3
Carbon Monoxide: 412.33 μg/m3
Nitrogen Dioxide: 21.29 μg/m3
Sulphur Dioxide: 12.27 μg/m3
Ozone: 111.48 μg/m3

Astronomical

Sunrise: 5:45 AM
Sun Transit: 1:12 PM
Sunset: 8:39 PM
Daylight: 14 hrs 54 mins
Moonrise: 6:39 AM
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 AM
2:01 PM - 4:31 PM

Minor Periods

9:46 PM - 11:16 PM
6:09 AM - 7:39 AM

Action Rating: 5 out of 5

Friday, June 27, 2025

Weather Forecast

Conditions: Cloudy
Average Temperature: 83.3°F
Average Humidity: 77%
Chance of Rain: 0%
Wind: 7.8 mph
UV Index: 1.3

Air Quality

AQI: 2 - Moderate
PM2.5: 31.66 μg/m3
PM10: 33.18 μg/m3
Carbon Monoxide: 439.63 μg/m3
Nitrogen Dioxide: 20.34 μg/m3
Sulphur Dioxide: 8.26 μg/m3
Ozone: 99.68 μg/m3

Astronomical

Sunrise: 5:45 AM
Sun Transit: 1:12 PM
Sunset: 8:39 PM
Daylight: 14 hrs 54 mins
Moonrise: 7:52 AM
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 AM
2:58 PM - 5:28 PM

Minor Periods

10:23 PM - 11:53 PM
7:22 AM - 8:52 AM

Action Rating: 3 out of 5

Saturday, June 28, 2025

Weather Forecast

Conditions: Moderate rain
Average Temperature: 76.9°F
Average Humidity: 84%
Chance of Rain: 78%
Wind: 8.7 mph
UV Index: 2.5

Air Quality

AQI: 2 - Moderate
PM2.5: 31.86 μg/m3
PM10: 33.12 μg/m3
Carbon Monoxide: 488.83 μg/m3
Nitrogen Dioxide: 28.96 μg/m3
Sulphur Dioxide: 8.87 μg/m3
Ozone: 73.62 μg/m3

Astronomical

Sunrise: 5:46 AM
Sun Transit: 1:12 PM
Sunset: 8:39 PM
Daylight: 14 hrs 53 mins
Moonrise: 9:04 AM
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 AM
3:49 PM - 6:19 PM

Minor Periods

12:00 AM - 12:00 AM
8:34 AM - 10:04 AM

Action Rating: 2 out of 5

Sunday, June 29, 2025

Weather Forecast

Conditions: Patchy rain nearby
Average Temperature: 76.4°F
Average Humidity: 85%
Chance of Rain: 76%
Wind: 6.9 mph
UV Index: 0.2

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: 5:46 AM
Sun Transit: 1:12 PM
Sunset: 8:39 PM
Daylight: 14 hrs 53 mins
Moonrise: 10:12 AM
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 AM
4:35 PM - 7:05 PM

Minor Periods

9:42 AM - 11:12 AM
12:00 AM - 12:00 AM

Action Rating: 3 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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