Water Temperature of Difficult Run in McLean, VA

Current Water Temperature

49.6°F

Measurement Time: Wednesday, March 25, 2026, 6:15 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

48.9°F
Partly cloudy
Partly cloudy
45.1°F
53.8°F
48%
S 8.7 mph
10 mph
51.8°F
37.4°F
0 in
75%
9 mi
1028 mbar
3.3

Five Day Weather Forecast

Sunny
Wed
H: 63°F
L: 36°F
Partly Cloudy
Thu
H: 72°F
L: 47°F
Overcast
Fri
H: 61°F
L: 44°F
Partly Cloudy
Sat
H: 49°F
L: 35°F
Sunny
Sun
H: 54°F
L: 32°F

Air Quality

AQI: 1 - Good
PM2.5: 8.85 μg/m3
PM10: 9.15 μg/m3
Carbon Monoxide: 211.85 μg/m3
Nitrogen Dioxide: 6.85 μg/m3
Sulphur Dioxide: 5.25 μg/m3
Ozone: 102 μg/m3

Astronomical

Sunrise: 7:04 AM
Sun Transit: 1:14 PM
Sunset: 7:26 PM
Daylight: 12 hrs 21 mins
Moonrise: 11:27 AM
Moon Transit: 7:29 PM
Moonset: 2:30 AM
Moon Phase: First Quarter
Moon Illumination: 45.1%

Best Times for Fishing or Hunting

Major Periods

8:14 AM - 10:44 AM
6:59 PM - 9:29 PM

Minor Periods

10:57 AM - 12:27 AM
2:00 AM - 3:30 AM

Action Rating: 3 out of 5

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

Effective: Wed March 25, 2026, 8:28 AM
Expires: Wed March 25, 2026, 8:38 AM

Monitoring message only. Please disregard.

Monitoring message only. Please disregard.
Wednesday, March 25, 2026

Weather Forecast

Sunny
63.3°F
35.6°F
49.4°F
51%
0 in
0%
0%
11.6 mph
1.1


Air Quality

AQI: 2 - Moderate
PM2.5: 15.55 μg/m3
PM10: 15.83 μg/m3
Carbon Monoxide: 277.81 μg/m3
Nitrogen Dioxide: 23.75 μg/m3
Sulphur Dioxide: 5.52 μg/m3
Ozone: 63.56 μg/m3

Astronomical

Sunrise: 7:04 AM
Sun Transit: 1:14 PM
Sunset: 7:26 PM
Daylight: 12 hrs 21 mins
Moonrise: 11:27 AM
Moon Transit: 7:29 PM
Moonset: 2:30 AM
Moon Phase: First Quarter
Moon Illumination: 45.1%

Best Times for Fishing or Hunting

Major Periods

8:14 AM - 10:44 AM
6:59 PM - 9:29 PM

Minor Periods

10:57 AM - 12:27 AM
2:00 AM - 3:30 AM

Action Rating: 3 out of 5

Thursday, March 26, 2026

Weather Forecast

Partly Cloudy
72.3°F
46.6°F
58.4°F
59%
0 in
0%
0%
13.4 mph
1.2


Air Quality

AQI: 1 - Good
PM2.5: 9.89 μg/m3
PM10: 10.25 μg/m3
Carbon Monoxide: 208.93 μg/m3
Nitrogen Dioxide: 10.08 μg/m3
Sulphur Dioxide: 4.68 μg/m3
Ozone: 94.08 μg/m3

Astronomical

Sunrise: 7:03 AM
Sun Transit: 1:14 PM
Sunset: 7:27 PM
Daylight: 12 hrs 24 mins
Moonrise: 12:37 AM
Moon Transit: 8:29 PM
Moonset: 3:26 AM
Moon Phase: First Quarter
Moon Illumination: 56.4%

Best Times for Fishing or Hunting

Major Periods

9:16 AM - 11:46 AM
7:59 PM - 10:29 PM

Minor Periods

12:07 AM - 1:37 PM
2:56 AM - 4:26 AM

Action Rating: 2 out of 5

Friday, March 27, 2026

Weather Forecast

Overcast
60.6°F
44.4°F
57.7°F
76%
0 in
0%
0%
12.8 mph
0.1


Air Quality

AQI: 1 - Good
PM2.5: 8.37 μg/m3
PM10: 8.56 μg/m3
Carbon Monoxide: 222.69 μg/m3
Nitrogen Dioxide: 9.07 μg/m3
Sulphur Dioxide: 3.1 μg/m3
Ozone: 76.72 μg/m3

Astronomical

Sunrise: 7:01 AM
Sun Transit: 1:14 PM
Sunset: 7:28 PM
Daylight: 12 hrs 26 mins
Moonrise: 1:50 PM
Moon Transit: 9:25 PM
Moonset: 4:12 AM
Moon Phase: First Quarter
Moon Illumination: 67.4%

Best Times for Fishing or Hunting

Major Periods

10:13 AM - 12:43 AM
8:55 PM - 11:25 PM

Minor Periods

1:20 PM - 2:50 PM
3:42 AM - 5:12 AM

Action Rating: 2 out of 5

Saturday, March 28, 2026

Weather Forecast

Partly Cloudy
49.1°F
34.7°F
42.4°F
52%
0 in
0%
0%
12.8 mph
1.6


Air Quality

AQI: 1 - Good
PM2.5: 4.94 μg/m3
PM10: 5.24 μg/m3
Carbon Monoxide: 192.27 μg/m3
Nitrogen Dioxide: 8.82 μg/m3
Sulphur Dioxide: 3.31 μg/m3
Ozone: 78.12 μg/m3

Astronomical

Sunrise: 7:00 AM
Sun Transit: 1:14 PM
Sunset: 7:29 PM
Daylight: 12 hrs 29 mins
Moonrise: 3:02 PM
Moon Transit: 10:16 PM
Moonset: 4:49 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 77.5%

Best Times for Fishing or Hunting

Major Periods

11:06 AM - 1:36 PM
12:00 AM - 12:00 AM

Minor Periods

2:32 PM - 4:02 PM
4:19 AM - 5:49 AM

Action Rating: 2 out of 5

Sunday, March 29, 2026

Weather Forecast

Sunny
54.4°F
31.9°F
42.7°F
41%
0 in
0%
0%
9.8 mph
0


Air Quality

AQI: 1 - Good
PM2.5: 12.27 μg/m3
PM10: 12.49 μg/m3
Carbon Monoxide: 263.7 μg/m3
Nitrogen Dioxide: 23.95 μg/m3
Sulphur Dioxide: 6.21 μg/m3
Ozone: 51.69 μg/m3

Astronomical

Sunrise: 6:58 AM
Sun Transit: 1:13 PM
Sunset: 7:30 PM
Daylight: 12 hrs 31 mins
Moonrise: 4:12 PM
Moon Transit: 11:03 PM
Moonset: 5:18 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 86.2%

Best Times for Fishing or Hunting

Major Periods

11:55 AM - 2:25 PM
12:00 AM - 12:00 AM

Minor Periods

3:42 PM - 5:12 PM
4:48 AM - 6:18 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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