Water Temperature of Difficult Run in McLean, VA

Current Water Temperature

75.0°F

Measurement Time: Monday, August 3, 2026, 4:15 AM 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

77.7°F
Cloudy
Cloudy
82.6°F
82.8°F
88%
SSW 7.6 mph
10.3 mph
77.7°F
73.9°F
0 in
74%
6 mi
1009 mbar
1.6

Five Day Weather Forecast

Partly Cloudy
Mon
H: 88°F
L: 73°F
Partly Cloudy
Tue
H: 87°F
L: 71°F
Overcast
Wed
H: 88°F
L: 72°F
Partly Cloudy
Thu
H: 95°F
L: 73°F
Sunny
Fri
H: 100°F
L: 75°F

Air Quality

AQI: 1 - Good
PM2.5: 3.6 μg/m3
PM10: 3.6 μg/m3
Carbon Monoxide: 139 μg/m3
Nitrogen Dioxide: 4.8 μg/m3
Sulphur Dioxide: 1.1 μg/m3
Ozone: 66 μg/m3

Astronomical

Sunrise: 6:12 AM
Sun Transit: 1:15 PM
Sunset: 8:18 PM
Daylight: 14 hrs 7 mins
Moonrise: 10:41 PM
Moon Transit: 12:00 AM
Moonset: 11:15 AM
Moon Phase: Waning Gibbous
Moon Illumination: 65.6%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
12:00 AM - 12:00 AM

Minor Periods

10:11 PM - 11:41 PM
10:45 AM - 12:15 AM

Action Rating: 2 out of 5

Monday, August 3, 2026

Weather Forecast

Partly Cloudy
88.2°F
73°F
79.6°F
75%
0.03 in
42%
0%
10.1 mph
8.3


Air Quality

AQI: 1 - Good
PM2.5: 3.81 μg/m3
PM10: 3.88 μg/m3
Carbon Monoxide: 151.38 μg/m3
Nitrogen Dioxide: 4.73 μg/m3
Sulphur Dioxide: 1.19 μg/m3
Ozone: 75.63 μg/m3

Astronomical

Sunrise: 6:12 AM
Sun Transit: 1:15 PM
Sunset: 8:18 PM
Daylight: 14 hrs 7 mins
Moonrise: 10:41 PM
Moon Transit: 12:00 AM
Moonset: 11:15 AM
Moon Phase: Waning Gibbous
Moon Illumination: 65.6%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
12:00 AM - 12:00 AM

Minor Periods

10:11 PM - 11:41 PM
10:45 AM - 12:15 AM

Action Rating: 2 out of 5

Tuesday, August 4, 2026

Weather Forecast

Partly Cloudy
86.7°F
71.1°F
77.5°F
66%
0 in
10%
0%
10.5 mph
8


Air Quality

AQI: 1 - Good
PM2.5: 7.16 μg/m3
PM10: 7.3 μg/m3
Carbon Monoxide: 175.83 μg/m3
Nitrogen Dioxide: 7.65 μg/m3
Sulphur Dioxide: 1.77 μg/m3
Ozone: 86.21 μg/m3

Astronomical

Sunrise: 6:13 AM
Sun Transit: 1:15 PM
Sunset: 8:17 PM
Daylight: 14 hrs 5 mins
Moonrise: 11:08 PM
Moon Transit: 5:25 AM
Moonset: 12:23 AM
Moon Phase: Last Quarter
Moon Illumination: 54.6%

Best Times for Fishing or Hunting

Major Periods

4:55 AM - 7:25 AM
7:05 PM - 9:35 PM

Minor Periods

12:00 AM - 12:00 AM
11:53 AM - 1:23 PM

Action Rating: 2 out of 5

Wednesday, August 5, 2026

Weather Forecast

Overcast
88.1°F
71.9°F
77.7°F
78%
0.05 in
63%
0%
9.8 mph
8.5


Air Quality

AQI: 1 - Good
PM2.5: 9.03 μg/m3
PM10: 10.36 μg/m3
Carbon Monoxide: 198.79 μg/m3
Nitrogen Dioxide: 13.21 μg/m3
Sulphur Dioxide: 1.89 μg/m3
Ozone: 82.54 μg/m3

Astronomical

Sunrise: 6:14 AM
Sun Transit: 1:15 PM
Sunset: 8:16 PM
Daylight: 14 hrs 3 mins
Moonrise: 12:08 AM
Moon Transit: 6:14 AM
Moonset: 1:34 PM
Moon Phase: Last Quarter
Moon Illumination: 43.2%

Best Times for Fishing or Hunting

Major Periods

5:44 AM - 8:14 AM
7:56 PM - 10:26 PM

Minor Periods

1:04 PM - 2:34 PM
12:00 AM - 12:00 AM

Action Rating: 4 out of 5

Thursday, August 6, 2026

Weather Forecast

Partly Cloudy
95.4°F
72.5°F
81.7°F
69%
0.01 in
19%
0%
11.9 mph
9.4


Air Quality

AQI: 1 - Good
PM2.5: 6.45 μg/m3
PM10: 6.51 μg/m3
Carbon Monoxide: 177.24 μg/m3
Nitrogen Dioxide: 8.55 μg/m3
Sulphur Dioxide: 1.27 μg/m3
Ozone: 76.46 μg/m3

Astronomical

Sunrise: 6:15 AM
Sun Transit: 1:14 PM
Sunset: 8:15 PM
Daylight: 14 hrs mins
Moonrise: 12:40 AM
Moon Transit: 7:08 AM
Moonset: 2:48 PM
Moon Phase: Last Quarter
Moon Illumination: 32.3%

Best Times for Fishing or Hunting

Major Periods

6:38 AM - 9:08 AM
8:52 PM - 11:22 PM

Minor Periods

2:18 PM - 3:48 PM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

Friday, August 7, 2026

Weather Forecast

Sunny
99.8°F
74.5°F
84.6°F
61%
0.05 in
57%
0%
7.6 mph
9


Air Quality

AQI: 1 - Good
PM2.5: 7.39 μg/m3
PM10: 7.52 μg/m3
Carbon Monoxide: 261.22 μg/m3
Nitrogen Dioxide: 6.89 μg/m3
Sulphur Dioxide: 1.2 μg/m3
Ozone: 60.22 μg/m3

Astronomical

Sunrise: 6:15 AM
Sun Transit: 1:14 PM
Sunset: 8:14 PM
Daylight: 13 hrs 58 mins
Moonrise: 12:20 AM
Moon Transit: 8:06 AM
Moonset: 4:02 PM
Moon Phase: Last Quarter
Moon Illumination: 22.2%

Best Times for Fishing or Hunting

Major Periods

7:36 AM - 10:06 AM
12:00 AM - 12:00 AM

Minor Periods

3:32 PM - 5:02 PM
12:00 AM - 12:00 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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