Water Temperature of Difficult Run in McLean, VA

Current Water Temperature

63.1°F

Measurement Time: Tuesday, May 26, 2026, 11:15 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

72°F
Light rain
Light rain
76.3°F
79°F
82%
S 4.5 mph
5.7 mph
75.9°F
67.3°F
0 in
100%
9 mi
1020 mbar
1.6

Five Day Weather Forecast

Patchy rain nearby
Tue
H: 77°F
L: 63°F
Moderate rain
Wed
H: 76°F
L: 63°F
Patchy rain nearby
Thu
H: 77°F
L: 58°F
Sunny
Fri
H: 75°F
L: 51°F
Sunny
Sat
H: 69°F
L: 53°F

Air Quality

AQI: 1 - Good
PM2.5: 10.65 μg/m3
PM10: 10.65 μg/m3
Carbon Monoxide: 296.85 μg/m3
Nitrogen Dioxide: 19.85 μg/m3
Sulphur Dioxide: 3.65 μg/m3
Ozone: 55 μg/m3

Astronomical

Sunrise: 5:48 AM
Sun Transit: 1:06 PM
Sunset: 8:25 PM
Daylight: 14 hrs 37 mins
Moonrise: 4:13 PM
Moon Transit: 9:52 PM
Moonset: 3:00 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 76.9%

Best Times for Fishing or Hunting

Major Periods

10:46 AM - 1:16 PM
9:22 PM - 11:52 PM

Minor Periods

3:43 PM - 5:13 PM
2:30 AM - 4:00 AM

Action Rating: 2 out of 5

This is only a test for monitoring of vital dissemination systems.

Effective: Tue May 26, 2026, 2:20 PM
Expires: Tue May 26, 2026, 2:30 PM

Monitoring message only. Please disregard.

Monitoring message only. Please disregard.
Tuesday, May 26, 2026

Weather Forecast

Patchy rain nearby
76.8°F
63.3°F
70.2°F
86%
0.02 in
89%
0%
7.4 mph
1.8


Air Quality

AQI: 1 - Good
PM2.5: 12.66 μg/m3
PM10: 12.77 μg/m3
Carbon Monoxide: 256.33 μg/m3
Nitrogen Dioxide: 20.46 μg/m3
Sulphur Dioxide: 3.28 μg/m3
Ozone: 47.04 μg/m3

Astronomical

Sunrise: 5:48 AM
Sun Transit: 1:06 PM
Sunset: 8:25 PM
Daylight: 14 hrs 37 mins
Moonrise: 4:13 PM
Moon Transit: 9:52 PM
Moonset: 3:00 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 76.9%

Best Times for Fishing or Hunting

Major Periods

10:46 AM - 1:16 PM
9:22 PM - 11:52 PM

Minor Periods

3:43 PM - 5:13 PM
2:30 AM - 4:00 AM

Action Rating: 2 out of 5

Wednesday, May 27, 2026

Weather Forecast

Moderate rain
76.2°F
63.3°F
68.2°F
96%
0.53 in
86%
0%
6 mph
6.5


Air Quality

AQI: 1 - Good
PM2.5: 7.59 μg/m3
PM10: 7.65 μg/m3
Carbon Monoxide: 188.25 μg/m3
Nitrogen Dioxide: 13.53 μg/m3
Sulphur Dioxide: 2.47 μg/m3
Ozone: 50.32 μg/m3

Astronomical

Sunrise: 5:47 AM
Sun Transit: 1:06 PM
Sunset: 8:25 PM
Daylight: 14 hrs 38 mins
Moonrise: 5:15 PM
Moon Transit: 10:35 PM
Moonset: 3:23 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 85.7%

Best Times for Fishing or Hunting

Major Periods

11:28 AM - 1:58 PM
12:00 AM - 12:00 AM

Minor Periods

4:45 PM - 6:15 PM
2:53 AM - 4:23 AM

Action Rating: 2 out of 5

Thursday, May 28, 2026

Weather Forecast

Patchy rain nearby
76.5°F
58.1°F
67.2°F
77%
0.06 in
88%
0%
8.5 mph
8.4


Air Quality

AQI: 1 - Good
PM2.5: 6.18 μg/m3
PM10: 6.37 μg/m3
Carbon Monoxide: 166.25 μg/m3
Nitrogen Dioxide: 6.85 μg/m3
Sulphur Dioxide: 1.85 μg/m3
Ozone: 63.2 μg/m3

Astronomical

Sunrise: 5:47 AM
Sun Transit: 1:06 PM
Sunset: 8:26 PM
Daylight: 14 hrs 39 mins
Moonrise: 6:18 PM
Moon Transit: 11:19 PM
Moonset: 3:47 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 92.7%

Best Times for Fishing or Hunting

Major Periods

12:12 AM - 2:42 PM
12:00 AM - 12:00 AM

Minor Periods

5:48 PM - 7:18 PM
3:17 AM - 4:47 AM

Action Rating: 2 out of 5

Friday, May 29, 2026

Weather Forecast

Sunny
74.9°F
51.2°F
63.5°F
66%
0 in
0%
0%
7.4 mph
8.6


Air Quality

AQI: 1 - Good
PM2.5: 5.62 μg/m3
PM10: 5.95 μg/m3
Carbon Monoxide: 158.16 μg/m3
Nitrogen Dioxide: 7.85 μg/m3
Sulphur Dioxide: 1.9 μg/m3
Ozone: 62.76 μg/m3

Astronomical

Sunrise: 5:46 AM
Sun Transit: 1:06 PM
Sunset: 8:27 PM
Daylight: 14 hrs 41 mins
Moonrise: 7:20 PM
Moon Transit: 12:00 AM
Moonset: 4:15 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 97.4%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
12:58 AM - 3:28 PM

Minor Periods

6:50 PM - 8:20 PM
3:45 AM - 5:15 AM

Action Rating: 3 out of 5

Saturday, May 30, 2026

Weather Forecast

Sunny
69.3°F
53.1°F
60.5°F
59%
0 in
0%
0%
11.9 mph
0.9


Air Quality

AQI: 1 - Good
PM2.5: 5.31 μg/m3
PM10: 5.7 μg/m3
Carbon Monoxide: 178.33 μg/m3
Nitrogen Dioxide: 7.15 μg/m3
Sulphur Dioxide: 1.67 μg/m3
Ozone: 59.69 μg/m3

Astronomical

Sunrise: 5:46 AM
Sun Transit: 1:06 PM
Sunset: 8:28 PM
Daylight: 14 hrs 42 mins
Moonrise: 8:21 PM
Moon Transit: 12:06 AM
Moonset: 4:48 AM
Moon Phase: Full
Moon Illumination: 99.8%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
1:46 PM - 4:16 PM

Minor Periods

7:51 PM - 9:21 PM
4:18 AM - 5:48 AM

Action Rating: 4 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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