Water Temperature of Difficult Run in McLean, VA

Current Water Temperature

44.4°F

Measurement Time: Saturday, January 10, 2026, 7:15 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

45°F
Overcast
Overcast
42.3°F
46.3°F
97%
W 4.9 mph
10.3 mph
45°F
45.2°F
0 in
100%
9 mi
1010 mbar
0

Five Day Weather Forecast

Sunny
Sun
H: 49°F
L: 31°F
Sunny
Mon
H: 44°F
L: 28°F
Sunny
Tue
H: 51°F
L: 32°F
Overcast
Wed
H: 51°F
L: 41°F
Moderate rain
Thu
H: 42°F
L: 30°F

Air Quality

PM2.5: 2.15 μg/m3
PM10: 2.35 μg/m3
Carbon Monoxide: 176.85 μg/m3
Nitrogen Dioxide: 5.75 μg/m3
Sulphur Dioxide: 7.35 μg/m3
Ozone: 61 μg/m3

Astronomical

Sunrise: 7:27 AM
Sun Transit: 12:17 AM
Sunset: 5:07 PM
Daylight: 9 hrs 40 mins
Moonrise: 1:10 AM
Moon Transit: 6:31 AM
Moonset: 11:45 AM
Moon Phase: Last Quarter
Moon Illumination: 35.3%

Best Times for Fishing or Hunting

Major Periods

6:01 AM - 8:31 AM
8:08 PM - 10:38 PM

Minor Periods

11:15 AM - 12:45 AM
12:40 AM - 2:10 AM

Action Rating: 2 out of 5

Sunday, January 11, 2026

Weather Forecast

Sunny
48.7°F
31.1°F
41.2°F
68%
0 in
0%
0%
16.8 mph
0.4


Air Quality

AQI: 1 - Good
PM2.5: 5.17 μg/m3
PM10: 5.53 μg/m3
Carbon Monoxide: 249.25 μg/m3
Nitrogen Dioxide: 16.6 μg/m3
Sulphur Dioxide: 7.33 μg/m3
Ozone: 45.08 μg/m3

Astronomical

Sunrise: 7:27 AM
Sun Transit: 12:17 AM
Sunset: 5:07 PM
Daylight: 9 hrs 40 mins
Moonrise: 1:10 AM
Moon Transit: 6:31 AM
Moonset: 11:45 AM
Moon Phase: Last Quarter
Moon Illumination: 35.3%

Best Times for Fishing or Hunting

Major Periods

6:01 AM - 8:31 AM
8:08 PM - 10:38 PM

Minor Periods

11:15 AM - 12:45 AM
12:40 AM - 2:10 AM

Action Rating: 2 out of 5

Monday, January 12, 2026

Weather Forecast

Sunny
44.2°F
28°F
35.4°F
61%
0 in
0%
0%
14.8 mph
0.4


Air Quality

AQI: 1 - Good
PM2.5: 4.41 μg/m3
PM10: 4.87 μg/m3
Carbon Monoxide: 196.49 μg/m3
Nitrogen Dioxide: 8.84 μg/m3
Sulphur Dioxide: 7.39 μg/m3
Ozone: 61.32 μg/m3

Astronomical

Sunrise: 7:27 AM
Sun Transit: 12:17 AM
Sunset: 5:08 PM
Daylight: 9 hrs 41 mins
Moonrise: 2:12 AM
Moon Transit: 7:15 AM
Moonset: 12:12 AM
Moon Phase: Last Quarter
Moon Illumination: 25.0%

Best Times for Fishing or Hunting

Major Periods

6:45 AM - 9:15 AM
8:53 PM - 11:23 PM

Minor Periods

11:42 AM - 1:12 PM
1:42 AM - 3:12 AM

Action Rating: 2 out of 5

Tuesday, January 13, 2026

Weather Forecast

Sunny
51.1°F
31.5°F
39.8°F
54%
0 in
0%
0%
11.9 mph
0.4


Air Quality

AQI: 1 - Good
PM2.5: 10.77 μg/m3
PM10: 11.53 μg/m3
Carbon Monoxide: 277.62 μg/m3
Nitrogen Dioxide: 23.16 μg/m3
Sulphur Dioxide: 10.73 μg/m3
Ozone: 40.72 μg/m3

Astronomical

Sunrise: 7:27 AM
Sun Transit: 12:17 AM
Sunset: 5:09 PM
Daylight: 9 hrs 42 mins
Moonrise: 3:14 AM
Moon Transit: 8:01 AM
Moonset: 12:44 AM
Moon Phase: Waning Crescent
Moon Illumination: 15.9%

Best Times for Fishing or Hunting

Major Periods

7:31 AM - 10:01 AM
12:00 AM - 12:00 AM

Minor Periods

12:14 AM - 1:44 PM
2:44 AM - 4:14 AM

Action Rating: 3 out of 5

Wednesday, January 14, 2026

Weather Forecast

Overcast
50.6°F
41.2°F
45°F
58%
0 in
0%
0%
12.1 mph
0.2


Air Quality

AQI: 1 - Good
PM2.5: 8.59 μg/m3
PM10: 8.68 μg/m3
Carbon Monoxide: 242.16 μg/m3
Nitrogen Dioxide: 14.72 μg/m3
Sulphur Dioxide: 7.93 μg/m3
Ozone: 52.23 μg/m3

Astronomical

Sunrise: 7:26 AM
Sun Transit: 12:18 AM
Sunset: 5:10 PM
Daylight: 9 hrs 43 mins
Moonrise: 4:15 AM
Moon Transit: 8:49 AM
Moonset: 1:21 PM
Moon Phase: Waning Crescent
Moon Illumination: 8.5%

Best Times for Fishing or Hunting

Major Periods

8:19 AM - 10:49 AM
12:00 AM - 12:00 AM

Minor Periods

12:51 AM - 2:21 PM
3:45 AM - 5:15 AM

Action Rating: 2 out of 5

Thursday, January 15, 2026

Weather Forecast

Moderate rain
42.3°F
30.4°F
40.4°F
88%
0.54 in
60%
8%
14.8 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: 7:26 AM
Sun Transit: 12:18 AM
Sunset: 5:11 PM
Daylight: 9 hrs 45 mins
Moonrise: 5:14 AM
Moon Transit: 9:40 AM
Moonset: 2:07 PM
Moon Phase: Waning Crescent
Moon Illumination: 3.3%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
9:10 AM - 11:40 AM

Minor Periods

1:37 PM - 3:07 PM
4:44 AM - 6:14 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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