Water Temperature of Difficult Run in McLean, VA

Current Water Temperature

72.5°F

Measurement Time: Thursday, June 18, 2026, 7:15 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

75.9°F
Light rain
Light rain
77.5°F
98.8°F
67%
WSW 13.2 mph
17.9 mph
92.9°F
70.6°F
0 in
75%
6 mi
1005 mbar
9.3

Five Day Weather Forecast

Patchy rain nearby
Thu
H: 98°F
L: 73°F
Partly Cloudy
Fri
H: 86°F
L: 68°F
Sunny
Sat
H: 82°F
L: 59°F
Sunny
Sun
H: 89°F
L: 60°F
Moderate rain
Mon
H: 71°F
L: 64°F

Air Quality

AQI: 1 - Good
PM2.5: 5.6 μg/m3
PM10: 5.8 μg/m3
Carbon Monoxide: 133 μg/m3
Nitrogen Dioxide: 2.4 μg/m3
Sulphur Dioxide: 0.9 μg/m3
Ozone: 101 μg/m3

Astronomical

Sunrise: 5:43 AM
Sun Transit: 1:10 PM
Sunset: 8:38 PM
Daylight: 14 hrs 55 mins
Moonrise: 9:36 AM
Moon Transit: 4:50 PM
Moonset: 12:19 AM
Moon Phase: Waxing Crescent
Moon Illumination: 10.4%

Best Times for Fishing or Hunting

Major Periods

5:39 AM - 8:09 AM
4:20 PM - 6:50 PM

Minor Periods

9:06 AM - 10:36 AM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

Thursday, June 18, 2026

Weather Forecast

Patchy rain nearby
98.2°F
72.7°F
84.4°F
48%
0.03 in
36%
0%
16.3 mph
9.3


Air Quality

AQI: 1 - Good
PM2.5: 5.41 μg/m3
PM10: 5.65 μg/m3
Carbon Monoxide: 137.21 μg/m3
Nitrogen Dioxide: 4.82 μg/m3
Sulphur Dioxide: 1.14 μg/m3
Ozone: 86.5 μg/m3

Astronomical

Sunrise: 5:43 AM
Sun Transit: 1:10 PM
Sunset: 8:38 PM
Daylight: 14 hrs 55 mins
Moonrise: 9:36 AM
Moon Transit: 4:50 PM
Moonset: 12:19 AM
Moon Phase: Waxing Crescent
Moon Illumination: 10.4%

Best Times for Fishing or Hunting

Major Periods

5:39 AM - 8:09 AM
4:20 PM - 6:50 PM

Minor Periods

9:06 AM - 10:36 AM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

Friday, June 19, 2026

Weather Forecast

Partly Cloudy
85.6°F
67.6°F
74.6°F
51%
0 in
5%
0%
14.5 mph
9.8


Air Quality

AQI: 1 - Good
PM2.5: 3.99 μg/m3
PM10: 4.13 μg/m3
Carbon Monoxide: 135.83 μg/m3
Nitrogen Dioxide: 4.44 μg/m3
Sulphur Dioxide: 1.32 μg/m3
Ozone: 87.88 μg/m3

Astronomical

Sunrise: 5:43 AM
Sun Transit: 1:10 PM
Sunset: 8:38 PM
Daylight: 14 hrs 55 mins
Moonrise: 10:49 AM
Moon Transit: 5:39 PM
Moonset: 12:51 AM
Moon Phase: Waxing Crescent
Moon Illumination: 18.3%

Best Times for Fishing or Hunting

Major Periods

6:31 AM - 9:01 AM
5:09 PM - 7:39 PM

Minor Periods

10:19 AM - 11:49 AM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Saturday, June 20, 2026

Weather Forecast

Sunny
81.8°F
58.8°F
69.6°F
53%
0 in
2%
0%
13.4 mph
9.4


Air Quality

AQI: 1 - Good
PM2.5: 4.13 μg/m3
PM10: 4.23 μg/m3
Carbon Monoxide: 122.38 μg/m3
Nitrogen Dioxide: 4.35 μg/m3
Sulphur Dioxide: 1.24 μg/m3
Ozone: 80.38 μg/m3

Astronomical

Sunrise: 5:43 AM
Sun Transit: 1:10 PM
Sunset: 8:38 PM
Daylight: 14 hrs 55 mins
Moonrise: 11:58 AM
Moon Transit: 6:25 PM
Moonset: 12:19 AM
Moon Phase: Waxing Crescent
Moon Illumination: 27.8%

Best Times for Fishing or Hunting

Major Periods

7:18 AM - 9:48 AM
5:55 PM - 8:25 PM

Minor Periods

11:28 AM - 12:58 AM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

Sunday, June 21, 2026

Weather Forecast

Sunny
89.1°F
59.9°F
73.9°F
48%
0 in
3%
0%
8.3 mph
10


Air Quality

AQI: 1 - Good
PM2.5: 7.63 μg/m3
PM10: 8.16 μg/m3
Carbon Monoxide: 134.16 μg/m3
Nitrogen Dioxide: 10.23 μg/m3
Sulphur Dioxide: 1.32 μg/m3
Ozone: 77.58 μg/m3

Astronomical

Sunrise: 5:43 AM
Sun Transit: 1:10 PM
Sunset: 8:38 PM
Daylight: 14 hrs 55 mins
Moonrise: 1:03 PM
Moon Transit: 7:08 PM
Moonset: 12:42 AM
Moon Phase: First Quarter
Moon Illumination: 38.5%

Best Times for Fishing or Hunting

Major Periods

8:02 AM - 10:32 AM
6:38 PM - 9:08 PM

Minor Periods

12:33 AM - 2:03 PM
12:12 AM - 1:42 AM

Action Rating: 3 out of 5

Monday, June 22, 2026

Weather Forecast

Moderate rain
71°F
64.1°F
67.4°F
85%
0.21 in
84%
0%
8.7 mph
0.1


Air Quality

AQI: 1 - Good
PM2.5: 8.5 μg/m3
PM10: 8.8 μg/m3
Carbon Monoxide: 207.22 μg/m3
Nitrogen Dioxide: 8 μg/m3
Sulphur Dioxide: 1.28 μg/m3
Ozone: 67.89 μg/m3

Astronomical

Sunrise: 5:44 AM
Sun Transit: 1:11 PM
Sunset: 8:39 PM
Daylight: 14 hrs 55 mins
Moonrise: 2:06 PM
Moon Transit: 7:51 PM
Moonset: 1:04 AM
Moon Phase: First Quarter
Moon Illumination: 49.7%

Best Times for Fishing or Hunting

Major Periods

8:44 AM - 11:14 AM
7:21 PM - 9:51 PM

Minor Periods

1:36 PM - 3:06 PM
12:34 AM - 2:04 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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