Water Temperature of Difficult Run in McLean, VA

Current Water Temperature

57.4°F

Measurement Time: Monday, April 20, 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

57.4°F
Sunny
Sunny
54.6°F
51.9°F
31%
NW 12.5 mph
14.6 mph
47.8°F
33.6°F
0 in
25%
9 mi
1022 mbar
5.4

Five Day Weather Forecast

Patchy rain nearby
Mon
H: 54°F
L: 40°F
Sunny
Tue
H: 61°F
L: 33°F
Patchy rain nearby
Wed
H: 65°F
L: 48°F
Sunny
Thu
H: 75°F
L: 50°F
Patchy rain nearby
Fri
H: 74°F
L: 56°F

Air Quality

AQI: 1 - Good
PM2.5: 3.55 μg/m3
PM10: 4.05 μg/m3
Carbon Monoxide: 163.85 μg/m3
Nitrogen Dioxide: 2.15 μg/m3
Sulphur Dioxide: 2.75 μg/m3
Ozone: 107 μg/m3

Astronomical

Sunrise: 6:25 AM
Sun Transit: 1:07 PM
Sunset: 7:51 PM
Daylight: 13 hrs 26 mins
Moonrise: 8:17 AM
Moon Transit: 4:15 PM
Moonset: 12:06 AM
Moon Phase: Waxing Crescent
Moon Illumination: 10.8%

Best Times for Fishing or Hunting

Major Periods

5:00 AM - 7:30 AM
3:45 PM - 6:15 PM

Minor Periods

7:47 AM - 9:17 AM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

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

Effective: Mon April 20, 2026, 8:29 AM
Expires: Mon April 20, 2026, 8:39 AM

Monitoring message only. Please disregard.

Monitoring message only. Please disregard.
Monday, April 20, 2026

Weather Forecast

Patchy rain nearby
54.3°F
40.3°F
47.5°F
47%
0.01 in
76%
0%
14.3 mph
5.9


Air Quality

AQI: 1 - Good
PM2.5: 6.53 μg/m3
PM10: 6.95 μg/m3
Carbon Monoxide: 200.73 μg/m3
Nitrogen Dioxide: 9.24 μg/m3
Sulphur Dioxide: 3.89 μg/m3
Ozone: 85.28 μg/m3

Astronomical

Sunrise: 6:25 AM
Sun Transit: 1:07 PM
Sunset: 7:51 PM
Daylight: 13 hrs 26 mins
Moonrise: 8:17 AM
Moon Transit: 4:15 PM
Moonset: 12:06 AM
Moon Phase: Waxing Crescent
Moon Illumination: 10.8%

Best Times for Fishing or Hunting

Major Periods

5:00 AM - 7:30 AM
3:45 PM - 6:15 PM

Minor Periods

7:47 AM - 9:17 AM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Tuesday, April 21, 2026

Weather Forecast

Sunny
60.9°F
32.9°F
47.3°F
41%
0 in
0%
0%
9.2 mph
6.7


Air Quality

AQI: 1 - Good
PM2.5: 6.58 μg/m3
PM10: 6.96 μg/m3
Carbon Monoxide: 182.89 μg/m3
Nitrogen Dioxide: 10.35 μg/m3
Sulphur Dioxide: 4.9 μg/m3
Ozone: 77.6 μg/m3

Astronomical

Sunrise: 6:24 AM
Sun Transit: 1:07 PM
Sunset: 7:52 PM
Daylight: 13 hrs 28 mins
Moonrise: 9:18 AM
Moon Transit: 5:20 PM
Moonset: 12:19 AM
Moon Phase: Waxing Crescent
Moon Illumination: 18.8%

Best Times for Fishing or Hunting

Major Periods

6:05 AM - 8:35 AM
4:50 PM - 7:20 PM

Minor Periods

8:48 AM - 10:18 AM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

Wednesday, April 22, 2026

Weather Forecast

Patchy rain nearby
65°F
47.9°F
55.4°F
69%
0.11 in
84%
0%
10.1 mph
3.2


Air Quality

AQI: 1 - Good
PM2.5: 8.95 μg/m3
PM10: 10.23 μg/m3
Carbon Monoxide: 219.25 μg/m3
Nitrogen Dioxide: 11.98 μg/m3
Sulphur Dioxide: 5.21 μg/m3
Ozone: 92 μg/m3

Astronomical

Sunrise: 6:23 AM
Sun Transit: 1:07 PM
Sunset: 7:53 PM
Daylight: 13 hrs 30 mins
Moonrise: 10:28 AM
Moon Transit: 6:23 PM
Moonset: 1:20 AM
Moon Phase: Waxing Crescent
Moon Illumination: 28.4%

Best Times for Fishing or Hunting

Major Periods

7:09 AM - 9:39 AM
5:53 PM - 8:23 PM

Minor Periods

9:58 AM - 11:28 AM
12:50 AM - 2:20 AM

Action Rating: 3 out of 5

Thursday, April 23, 2026

Weather Forecast

Sunny
75.2°F
49.5°F
61.9°F
64%
0 in
0%
0%
9.6 mph
7.2


Air Quality

AQI: 1 - Good
PM2.5: 14.11 μg/m3
PM10: 16.45 μg/m3
Carbon Monoxide: 269.68 μg/m3
Nitrogen Dioxide: 17.29 μg/m3
Sulphur Dioxide: 4.57 μg/m3
Ozone: 83.08 μg/m3

Astronomical

Sunrise: 6:21 AM
Sun Transit: 1:07 PM
Sunset: 7:54 PM
Daylight: 13 hrs 33 mins
Moonrise: 11:41 AM
Moon Transit: 7:21 PM
Moonset: 2:11 AM
Moon Phase: First Quarter
Moon Illumination: 39.1%

Best Times for Fishing or Hunting

Major Periods

8:09 AM - 10:39 AM
6:51 PM - 9:21 PM

Minor Periods

11:11 AM - 12:41 AM
1:41 AM - 3:11 AM

Action Rating: 2 out of 5

Friday, April 24, 2026

Weather Forecast

Patchy rain nearby
73.9°F
55.6°F
63.2°F
69%
0.13 in
87%
0%
7.8 mph
0.6


Air Quality

AQI: 1 - Good
PM2.5: 14.55 μg/m3
PM10: 16.42 μg/m3
Carbon Monoxide: 317.31 μg/m3
Nitrogen Dioxide: 31.9 μg/m3
Sulphur Dioxide: 6.38 μg/m3
Ozone: 49.77 μg/m3

Astronomical

Sunrise: 6:20 AM
Sun Transit: 1:07 PM
Sunset: 7:55 PM
Daylight: 13 hrs 35 mins
Moonrise: 12:54 AM
Moon Transit: 8:13 PM
Moonset: 2:50 AM
Moon Phase: First Quarter
Moon Illumination: 50.4%

Best Times for Fishing or Hunting

Major Periods

9:03 AM - 11:33 AM
7:43 PM - 10:13 PM

Minor Periods

12:24 AM - 1:54 PM
2:20 AM - 3:50 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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