Water Temperature of Difficult Run in McLean, VA

Current Water Temperature

85.1°F

Measurement Time: Friday, July 3, 2026, 2:15 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

98.1°F
Sunny
Sunny
99.2°F
107.3°F
46%
NW 5.1 mph
7.5 mph
102.9°F
63.2°F
0 in
25%
9 mi
1015 mbar
0.5

Five Day Weather Forecast

Sunny
Fri
H: 107°F
L: 78°F
Sunny
Sat
H: 102°F
L: 70°F
Sunny
Sun
H: 97°F
L: 69°F
Fog
Mon
H: 93°F
L: 71°F
Partly Cloudy
Tue
H: 92°F
L: 70°F

Air Quality

AQI: 1 - Good
PM2.5: 7.7 μg/m3
PM10: 8.7 μg/m3
Carbon Monoxide: 217 μg/m3
Nitrogen Dioxide: 4.2 μg/m3
Sulphur Dioxide: 1.4 μg/m3
Ozone: 119 μg/m3

Astronomical

Sunrise: 5:48 AM
Sun Transit: 1:13 PM
Sunset: 8:39 PM
Daylight: 14 hrs 50 mins
Moonrise: 11:03 PM
Moon Transit: 3:47 AM
Moonset: 9:05 AM
Moon Phase: Waning Gibbous
Moon Illumination: 80.3%

Best Times for Fishing or Hunting

Major Periods

3:17 AM - 5:47 AM
5:25 PM - 7:55 PM

Minor Periods

12:00 AM - 12:00 AM
8:35 AM - 10:05 AM

Action Rating: 3 out of 5

Friday, July 3, 2026

Weather Forecast

Sunny
107.4°F
77.9°F
92.6°F
53%
0 in
2%
0%
12.5 mph
9.9


Air Quality

AQI: 1 - Good
PM2.5: 13.43 μg/m3
PM10: 16.3 μg/m3
Carbon Monoxide: 170.25 μg/m3
Nitrogen Dioxide: 7.83 μg/m3
Sulphur Dioxide: 2.17 μg/m3
Ozone: 100.08 μg/m3

Astronomical

Sunrise: 5:48 AM
Sun Transit: 1:13 PM
Sunset: 8:39 PM
Daylight: 14 hrs 50 mins
Moonrise: 11:03 PM
Moon Transit: 3:47 AM
Moonset: 9:05 AM
Moon Phase: Waning Gibbous
Moon Illumination: 80.3%

Best Times for Fishing or Hunting

Major Periods

3:17 AM - 5:47 AM
5:25 PM - 7:55 PM

Minor Periods

12:00 AM - 12:00 AM
8:35 AM - 10:05 AM

Action Rating: 3 out of 5

Saturday, July 4, 2026

Weather Forecast

Sunny
101.6°F
70.2°F
83.1°F
62%
1.3 in
64%
0%
17.7 mph
10


Air Quality

AQI: 1 - Good
PM2.5: 11.42 μg/m3
PM10: 12.15 μg/m3
Carbon Monoxide: 150.88 μg/m3
Nitrogen Dioxide: 10.58 μg/m3
Sulphur Dioxide: 1.87 μg/m3
Ozone: 96.92 μg/m3

Astronomical

Sunrise: 5:49 AM
Sun Transit: 1:13 PM
Sunset: 8:38 PM
Daylight: 14 hrs 50 mins
Moonrise: 12:03 AM
Moon Transit: 4:31 AM
Moonset: 10:09 AM
Moon Phase: Waning Gibbous
Moon Illumination: 70.6%

Best Times for Fishing or Hunting

Major Periods

4:01 AM - 6:31 AM
6:08 PM - 8:38 PM

Minor Periods

9:39 AM - 11:09 AM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

Sunday, July 5, 2026

Weather Forecast

Sunny
96.7°F
68.8°F
78.6°F
77%
1.2 in
74%
0%
12.5 mph
9.4


Air Quality

AQI: 1 - Good
PM2.5: 12.28 μg/m3
PM10: 12.77 μg/m3
Carbon Monoxide: 165.46 μg/m3
Nitrogen Dioxide: 7.58 μg/m3
Sulphur Dioxide: 1.88 μg/m3
Ozone: 111.67 μg/m3

Astronomical

Sunrise: 5:49 AM
Sun Transit: 1:13 PM
Sunset: 8:38 PM
Daylight: 14 hrs 49 mins
Moonrise: 12:27 AM
Moon Transit: 5:14 AM
Moonset: 11:12 AM
Moon Phase: Waning Gibbous
Moon Illumination: 59.8%

Best Times for Fishing or Hunting

Major Periods

4:44 AM - 7:14 AM
12:00 AM - 12:00 AM

Minor Periods

10:42 AM - 12:12 AM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Monday, July 6, 2026

Weather Forecast

Fog
92.6°F
70.5°F
77°F
85%
0.28 in
83%
0%
14.3 mph
8.6


Air Quality

AQI: 1 - Good
PM2.5: 11.93 μg/m3
PM10: 13.41 μg/m3
Carbon Monoxide: 185.5 μg/m3
Nitrogen Dioxide: 9.28 μg/m3
Sulphur Dioxide: 1.78 μg/m3
Ozone: 83.21 μg/m3

Astronomical

Sunrise: 5:50 AM
Sun Transit: 1:13 PM
Sunset: 8:38 PM
Daylight: 14 hrs 48 mins
Moonrise: 12:49 AM
Moon Transit: 5:57 AM
Moonset: 12:16 AM
Moon Phase: Last Quarter
Moon Illumination: 48.6%

Best Times for Fishing or Hunting

Major Periods

5:27 AM - 7:57 AM
12:45 AM - 3:15 PM

Minor Periods

11:46 AM - 1:16 PM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

Tuesday, July 7, 2026

Weather Forecast

Partly Cloudy
92.3°F
70.2°F
80.5°F
71%
0.03 in
45%
0%
7.6 mph
8


Air Quality

AQI: 1 - Good
PM2.5: 5.29 μg/m3
PM10: 5.44 μg/m3
Carbon Monoxide: 225.22 μg/m3
Nitrogen Dioxide: 7.93 μg/m3
Sulphur Dioxide: 0.89 μg/m3
Ozone: 61.56 μg/m3

Astronomical

Sunrise: 5:50 AM
Sun Transit: 1:14 PM
Sunset: 8:38 PM
Daylight: 14 hrs 47 mins
Moonrise: 12:12 AM
Moon Transit: 12:00 AM
Moonset: 1:23 PM
Moon Phase: Last Quarter
Moon Illumination: 37.3%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
8:20 PM - 10:50 PM

Minor Periods

12:53 AM - 2:23 PM
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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