Water Temperature of Difficult Run in McLean, VA

Current Water Temperature

72.9°F

Measurement Time: Sunday, June 28, 2026, 1:15 PM EDT

Temperature Locations

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Local Points of Interest

Great Falls Park; Great Falls, VA

Difficult Run

Station Name: DIFFICULT RUN NEAR GREAT FALLS, VA
Data Source: Water Data - usgc.gov

Elevation Above Sea Level: 184 feet

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 mi)
Washington Channel, Washington, DC (14 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 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 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

75.9°F

Conditions: Partly cloudy

Feels Like: 79.4°F

Heat Index: 80.9°F

Humidity: 85%

Wind: N 2.5 mph

Wind Gusts: 3.5 mph

Wind Chill: 77.2°F

Dew Point: 70.4°F

Precipitation: 0 in

Cloud Cover: 75%

Visibility: 9 mi

Air Pressure: 1015 mbar

UV Index: 0.9

Five Day Weather Forecast

Sun
H: 77°F
L: 71°F

Mon
H: 85°F
L: 66°F

Tue
H: 93°F
L: 68°F

Wed
H: 101°F
L: 71°F

Thu
H: 102°F
L: 77°F

Air Quality

AQI: 2 - Moderate

PM2.5: 6.8 μg/m3

PM10: 7 μg/m3

Carbon Monoxide: 168 μg/m3
Nitrogen Dioxide: 2.5 μg/m3
Sulphur Dioxide: 1.4 μg/m3
Ozone: 129 μg/m3

Astronomical

Sunrise: 5:46 AM
Sun Transit: 1:12 PM
Sunset: 8:39 PM
Daylight: 14 hrs 53 mins

Moonrise: 8:07 PM
Moon Transit: 12:00 AM
Moonset: 4:10 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 98.8%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
1:23 PM - 3:53 PM

Minor Periods

7:37 PM - 9:07 PM
3:40 AM - 5:10 AM

Action Rating: 3 out of 5

Flood Warning issued June 28 at 11:26AM EDT until June 28 at 2:30PM EDT by NWS Baltimore MD/Washington DC

Effective: Sun June 28, 2026, 11:26 AM
Expires: Sun June 28, 2026, 2:30 PM

* WHAT...Flooding caused by excessive rainfall is expected. * WHERE...A portion of northern Virginia, portions of Fairfax County, including Fairfax City. * WHEN...Until 230 PM EDT. * IMPACTS...Flooding of rivers, creeks, streams, and other low-lying and flood-prone locations is imminent or occurring. * ADDITIONAL DETAILS... - At 1124 AM EDT, Doppler radar indicated heavy rain. Flooding is ongoing or expected to begin shortly in the warned area. Between 1 and 2 inches of rain have fallen. - Additional rainfall amounts of up to 1 inch are possible in the warned area. - Some locations that will experience flooding include... Centreville... Reston... Annandale... Herndon... Fairfax... Vienna... Mantua... Pimmit Hills... Oakton... Chantilly... Tysons Corner... Wolf Trap... Merrifield... I66 and I495 Interchange... Dunn Loring... - Please visit www.weather.gov/safety/flood for flood safety and preparedness information

Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles.

Sunday, June 28, 2026

Weather Forecast

Conditions: Overcast

High Temperature: 77.2°F

Low Temperature: 70.7°F

Average Temperature: 72.9°F

Average Humidity: 89%

Precipitation: 0.02 in

Chance of Rain: 56%

Chance of Snow: 0%

Maximum Wind: 4.7 mph

UV Index: 4.9

Air Quality

AQI: 1 - Good

PM2.5: 13.1 μg/m3

PM10: 13.4 μg/m3

Carbon Monoxide: 163.79 μg/m3
Nitrogen Dioxide: 11.33 μg/m3
Sulphur Dioxide: 1.87 μg/m3
Ozone: 87.83 μg/m3

Astronomical

Sunrise: 5:46 AM
Sun Transit: 1:12 PM
Sunset: 8:39 PM
Daylight: 14 hrs 53 mins

Moonrise: 8:07 PM
Moon Transit: 12:00 AM
Moonset: 4:10 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 98.8%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
1:23 PM - 3:53 PM

Minor Periods

7:37 PM - 9:07 PM
3:40 AM - 5:10 AM

Action Rating: 3 out of 5

Monday, June 29, 2026

Weather Forecast

Conditions: Sunny

High Temperature: 84.5°F

Low Temperature: 66.4°F

Average Temperature: 75.5°F

Average Humidity: 80%

Precipitation: 0.33 in

Chance of Rain: 76%

Chance of Snow: 0%

Maximum Wind: 5.8 mph

UV Index: 8.4

Air Quality

AQI: 1 - Good

PM2.5: 9.28 μg/m3

PM10: 9.62 μg/m3

Carbon Monoxide: 169.5 μg/m3
Nitrogen Dioxide: 7.66 μg/m3
Sulphur Dioxide: 1.96 μg/m3
Ozone: 107.88 μg/m3

Astronomical

Sunrise: 5:46 AM
Sun Transit: 1:12 PM
Sunset: 8:39 PM
Daylight: 14 hrs 53 mins

Moonrise: 8:55 PM
Moon Transit: 12:33 AM
Moonset: 5:01 AM
Moon Phase: Full
Moon Illumination: 100.0%

Best Times for Fishing or Hunting

Major Periods

12:03 AM - 2:33 AM
2:15 PM - 4:45 PM

Minor Periods

8:25 PM - 9:55 PM
4:31 AM - 6:01 AM

Action Rating: 5 out of 5

Tuesday, June 30, 2026

Weather Forecast

Conditions: Sunny

High Temperature: 93.1°F

Low Temperature: 67.7°F

Average Temperature: 79.2°F

Average Humidity: 67%

Precipitation: 0.1 in

Chance of Rain: 57%

Chance of Snow: 0%

Maximum Wind: 8.5 mph

UV Index: 10

Air Quality

AQI: 1 - Good

PM2.5: 8.23 μg/m3

PM10: 8.72 μg/m3

Carbon Monoxide: 156.67 μg/m3
Nitrogen Dioxide: 7.01 μg/m3
Sulphur Dioxide: 1.37 μg/m3
Ozone: 98.75 μg/m3

Astronomical

Sunrise: 5:47 AM
Sun Transit: 1:12 PM
Sunset: 8:39 PM
Daylight: 14 hrs 52 mins

Moonrise: 9:35 PM
Moon Transit: 1:24 AM
Moonset: 5:58 AM
Moon Phase: Full
Moon Illumination: 98.6%

Best Times for Fishing or Hunting

Major Periods

12:54 AM - 3:24 AM
3:05 PM - 5:35 PM

Minor Periods

9:05 PM - 10:35 PM
5:28 AM - 6:58 AM

Action Rating: 5 out of 5

Wednesday, July 1, 2026

Weather Forecast

Conditions: Sunny

High Temperature: 100.5°F

Low Temperature: 71.3°F

Average Temperature: 85.1°F

Average Humidity: 59%

Precipitation: 0 in

Chance of Rain: 4%

Chance of Snow: 0%

Maximum Wind: 9.6 mph

UV Index: 10.3

Air Quality

AQI: 1 - Good

PM2.5: 12.42 μg/m3

PM10: 16.17 μg/m3

Carbon Monoxide: 167.1 μg/m3
Nitrogen Dioxide: 7.56 μg/m3
Sulphur Dioxide: 1.93 μg/m3
Ozone: 96.13 μg/m3

Astronomical

Sunrise: 5:47 AM
Sun Transit: 1:12 PM
Sunset: 8:39 PM
Daylight: 14 hrs 52 mins

Moonrise: 10:09 PM
Moon Transit: 2:14 AM
Moonset: 6:59 AM
Moon Phase: Full
Moon Illumination: 94.7%

Best Times for Fishing or Hunting

Major Periods

1:44 AM - 4:14 AM
3:54 PM - 6:24 PM

Minor Periods

9:39 PM - 11:09 PM
6:29 AM - 7:59 AM

Action Rating: 3 out of 5

Thursday, July 2, 2026

Weather Forecast

Conditions: Sunny

High Temperature: 101.6°F

Low Temperature: 77.3°F

Average Temperature: 89.4°F

Average Humidity: 53%

Precipitation: 0 in

Chance of Rain: 2%

Chance of Snow: 0%

Maximum Wind: 5.8 mph

UV Index: 10.4

Air Quality

AQI: 2 - Moderate

PM2.5: 22.91 μg/m3

PM10: 28.68 μg/m3

Carbon Monoxide: 317.44 μg/m3
Nitrogen Dioxide: 21.87 μg/m3
Sulphur Dioxide: 2.22 μg/m3
Ozone: 52 μg/m3

Astronomical

Sunrise: 5:48 AM
Sun Transit: 1:13 PM
Sunset: 8:39 PM
Daylight: 14 hrs 51 mins

Moonrise: 10:38 PM
Moon Transit: 3:02 AM
Moonset: 8:02 AM
Moon Phase: Waning Gibbous
Moon Illumination: 88.5%

Best Times for Fishing or Hunting

Major Periods

2:32 AM - 5:02 AM
4:40 PM - 7:10 PM

Minor Periods

10:08 PM - 11:38 PM
7:32 AM - 9:02 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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Water Temperature of Difficult Run in McLean, VA

Current Water Temperature

Temperature Locations

Local Points of Interest

Nearby Water Temperatures

Weather for McLean, Virginia

Current Weather

Five Day Weather Forecast

Air Quality

Astronomical

Best Times for Fishing or Hunting

Major Periods

Minor Periods

Flood Warning issued June 28 at 11:26AM EDT until June 28 at 2:30PM EDT by NWS Baltimore MD/Washington DC

Weather Forecast

Air Quality

Astronomical

Best Times for Fishing or Hunting

Major Periods

Minor Periods

Weather Forecast

Air Quality

Astronomical

Best Times for Fishing or Hunting

Major Periods

Minor Periods

Weather Forecast

Air Quality

Astronomical

Best Times for Fishing or Hunting

Major Periods

Minor Periods

Weather Forecast

Air Quality

Astronomical

Best Times for Fishing or Hunting

Major Periods

Minor Periods

Weather Forecast

Air Quality

Astronomical

Best Times for Fishing or Hunting

Major Periods

Minor Periods

Webcams Near McLean, VA

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