Water Temperature of Difficult Run in McLean, VA

Current Water Temperature

31.8°F

Measurement Time: Tuesday, January 20, 2026, 8:15 PM EST

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

21.9°F
Clear
Clear
18.4°F
18.7°F
50%
NNW 2.7 mph
3.9 mph
13.1°F
-1.9°F
0 in
0%
9 mi
1034 mbar
0

Five Day Weather Forecast

Partly Cloudy
Wed
H: 39°F
L: 15°F
Sunny
Thu
H: 51°F
L: 32°F
Overcast
Fri
H: 36°F
L: 18°F
Light snow
Sat
H: 19°F
L: 13°F
Heavy snow
Sun
H: 19°F
L: 17°F

Air Quality

PM2.5: 18.15 μg/m3
PM10: 19.05 μg/m3
Carbon Monoxide: 311.85 μg/m3
Nitrogen Dioxide: 49.95 μg/m3
Sulphur Dioxide: 11.65 μg/m3
Ozone: 14 μg/m3

Astronomical

Sunrise: 7:23 AM
Sun Transit: 12:20 AM
Sunset: 5:17 PM
Daylight: 9 hrs 54 mins
Moonrise: 9:04 AM
Moon Transit: 2:39 PM
Moonset: 8:24 PM
Moon Phase: Waxing Crescent
Moon Illumination: 8.1%

Best Times for Fishing or Hunting

Major Periods

3:32 AM - 6:02 AM
2:09 PM - 4:39 PM

Minor Periods

7:54 PM - 9:24 PM
8:34 AM - 10:04 AM

Action Rating: 2 out of 5

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

Effective: Wed January 21, 2026, 1:21 AM
Expires: Wed January 21, 2026, 1:31 AM

Monitoring message only. Please disregard.

Monitoring message only. Please disregard.
Wednesday, January 21, 2026

Weather Forecast

Partly Cloudy
38.7°F
14.7°F
27.1°F
43%
0 in
0%
0%
14.5 mph
0.4


Air Quality

AQI: 1 - Good
PM2.5: 13.87 μg/m3
PM10: 14.51 μg/m3
Carbon Monoxide: 272.53 μg/m3
Nitrogen Dioxide: 31.26 μg/m3
Sulphur Dioxide: 9.73 μg/m3
Ozone: 39.48 μg/m3

Astronomical

Sunrise: 7:23 AM
Sun Transit: 12:20 AM
Sunset: 5:17 PM
Daylight: 9 hrs 54 mins
Moonrise: 9:04 AM
Moon Transit: 2:39 PM
Moonset: 8:24 PM
Moon Phase: Waxing Crescent
Moon Illumination: 8.1%

Best Times for Fishing or Hunting

Major Periods

3:32 AM - 6:02 AM
2:09 PM - 4:39 PM

Minor Periods

7:54 PM - 9:24 PM
8:34 AM - 10:04 AM

Action Rating: 2 out of 5

Thursday, January 22, 2026

Weather Forecast

Sunny
50.9°F
32°F
39.2°F
56%
0 in
0%
0%
12.1 mph
0.4


Air Quality

AQI: 1 - Good
PM2.5: 9.67 μg/m3
PM10: 9.85 μg/m3
Carbon Monoxide: 246.05 μg/m3
Nitrogen Dioxide: 14.92 μg/m3
Sulphur Dioxide: 7.3 μg/m3
Ozone: 55.16 μg/m3

Astronomical

Sunrise: 7:23 AM
Sun Transit: 12:20 AM
Sunset: 5:19 PM
Daylight: 9 hrs 56 mins
Moonrise: 9:28 AM
Moon Transit: 3:23 PM
Moonset: 9:30 PM
Moon Phase: Waxing Crescent
Moon Illumination: 15.4%

Best Times for Fishing or Hunting

Major Periods

4:16 AM - 6:46 AM
2:53 PM - 5:23 PM

Minor Periods

9:00 PM - 10:30 PM
8:58 AM - 10:28 AM

Action Rating: 3 out of 5

Friday, January 23, 2026

Weather Forecast

Overcast
36°F
18°F
29°F
57%
0 in
0%
0%
16.6 mph
0.3


Air Quality

AQI: 1 - Good
PM2.5: 15.39 μg/m3
PM10: 15.67 μg/m3
Carbon Monoxide: 229.43 μg/m3
Nitrogen Dioxide: 26.45 μg/m3
Sulphur Dioxide: 10.26 μg/m3
Ozone: 36.12 μg/m3

Astronomical

Sunrise: 7:22 AM
Sun Transit: 12:20 AM
Sunset: 5:20 PM
Daylight: 9 hrs 58 mins
Moonrise: 9:51 AM
Moon Transit: 9:54 AM
Moonset: 10:38 PM
Moon Phase: Waxing Crescent
Moon Illumination: 24.4%

Best Times for Fishing or Hunting

Major Periods

9:24 AM - 11:54 AM
9:24 AM - 11:54 AM

Minor Periods

10:08 PM - 11:38 PM
9:21 AM - 10:51 AM

Action Rating: 2 out of 5

Saturday, January 24, 2026

Weather Forecast

Light snow
19°F
12.9°F
16°F
35%
0.02 in
87%
47%
16.3 mph
0.3


Air Quality

AQI: 1 - Good
PM2.5: 5.23 μg/m3
PM10: 5.33 μg/m3
Carbon Monoxide: 190.07 μg/m3
Nitrogen Dioxide: 11.73 μg/m3
Sulphur Dioxide: 4.69 μg/m3
Ozone: 61.54 μg/m3

Astronomical

Sunrise: 7:21 AM
Sun Transit: 12:21 AM
Sunset: 5:21 PM
Daylight: 9 hrs 59 mins
Moonrise: 10:15 AM
Moon Transit: 4:54 PM
Moonset: 11:47 PM
Moon Phase: First Quarter
Moon Illumination: 34.7%

Best Times for Fishing or Hunting

Major Periods

5:46 AM - 8:16 AM
4:24 PM - 6:54 PM

Minor Periods

12:00 AM - 12:00 AM
9:45 AM - 11:15 AM

Action Rating: 2 out of 5

Sunday, January 25, 2026

Weather Forecast

Heavy snow
19.1°F
16.6°F
18.1°F
79%
0.45 in
77%
60%
6.3 mph
0


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 7:21 AM
Sun Transit: 12:21 AM
Sunset: 5:22 PM
Daylight: 10 hrs 1 mins
Moonrise: 10:42 AM
Moon Transit: 5:43 PM
Moonset: 12:47 AM
Moon Phase: First Quarter
Moon Illumination: 45.8%

Best Times for Fishing or Hunting

Major Periods

6:34 AM - 9:04 AM
5:13 PM - 7:43 PM

Minor Periods

10:12 AM - 11:42 AM
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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