Water Temperature of Difficult Run in McLean, VA

Current Water Temperature

38.7°F

Measurement Time: Tuesday, February 24, 2026, 9:15 AM 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

37°F
Partly cloudy
Partly cloudy
30°F
37.3°F
35%
W 9.8 mph
12.1 mph
30.6°F
20.4°F
0 in
75%
9 mi
1016 mbar
1.1

Five Day Weather Forecast

Partly Cloudy
Tue
H: 44°F
L: 27°F
Partly Cloudy
Wed
H: 58°F
L: 33°F
Moderate rain
Thu
H: 46°F
L: 33°F
Moderate rain
Fri
H: 43°F
L: 33°F
Sunny
Sat
H: 55°F
L: 30°F

Air Quality

AQI: 3 - Unhealthy for Sensitive Groups
PM2.5: 15.55 μg/m3
PM10: 15.85 μg/m3
Carbon Monoxide: 482.85 μg/m3
Nitrogen Dioxide: 47.55 μg/m3
Sulphur Dioxide: 6.55 μg/m3
Ozone: 35 μg/m3

Astronomical

Sunrise: 6:49 AM
Sun Transit: 12:22 AM
Sunset: 5:56 PM
Daylight: 11 hrs 8 mins
Moonrise: 10:35 AM
Moon Transit: 6:30 PM
Moonset: 1:19 AM
Moon Phase: First Quarter
Moon Illumination: 51.1%

Best Times for Fishing or Hunting

Major Periods

7:15 AM - 9:45 AM
6:00 PM - 8:30 PM

Minor Periods

10:05 AM - 11:35 AM
12:49 AM - 2:19 AM

Action Rating: 4 out of 5

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

Effective: Tue February 24, 2026, 1:27 PM
Expires: Tue February 24, 2026, 1:37 PM

Monitoring message only. Please disregard.

Monitoring message only. Please disregard.
Tuesday, February 24, 2026

Weather Forecast

Partly Cloudy
43.7°F
26.8°F
32°F
61%
0 in
0%
0%
14.3 mph
0.6


Air Quality

AQI: 1 - Good
PM2.5: 4.57 μg/m3
PM10: 4.7 μg/m3
Carbon Monoxide: 217.25 μg/m3
Nitrogen Dioxide: 8.99 μg/m3
Sulphur Dioxide: 4.42 μg/m3
Ozone: 71.88 μg/m3

Astronomical

Sunrise: 6:49 AM
Sun Transit: 12:22 AM
Sunset: 5:56 PM
Daylight: 11 hrs 8 mins
Moonrise: 10:35 AM
Moon Transit: 6:30 PM
Moonset: 1:19 AM
Moon Phase: First Quarter
Moon Illumination: 51.1%

Best Times for Fishing or Hunting

Major Periods

7:15 AM - 9:45 AM
6:00 PM - 8:30 PM

Minor Periods

10:05 AM - 11:35 AM
12:49 AM - 2:19 AM

Action Rating: 4 out of 5

Wednesday, February 25, 2026

Weather Forecast

Partly Cloudy
58.1°F
32.5°F
42.5°F
61%
0 in
0%
0%
12.5 mph
0.5


Air Quality

AQI: 1 - Good
PM2.5: 9.18 μg/m3
PM10: 9.46 μg/m3
Carbon Monoxide: 256.73 μg/m3
Nitrogen Dioxide: 16.28 μg/m3
Sulphur Dioxide: 5.69 μg/m3
Ozone: 66.08 μg/m3

Astronomical

Sunrise: 6:47 AM
Sun Transit: 12:21 AM
Sunset: 5:57 PM
Daylight: 11 hrs 10 mins
Moonrise: 11:30 AM
Moon Transit: 7:32 PM
Moonset: 2:32 AM
Moon Phase: First Quarter
Moon Illumination: 62.3%

Best Times for Fishing or Hunting

Major Periods

8:17 AM - 10:47 AM
7:02 PM - 9:32 PM

Minor Periods

11:00 AM - 12:30 AM
2:02 AM - 3:32 AM

Action Rating: 2 out of 5

Thursday, February 26, 2026

Weather Forecast

Moderate rain
45.6°F
33.3°F
41.7°F
83%
0.24 in
86%
0%
8.9 mph
0.1


Air Quality

AQI: 2 - Moderate
PM2.5: 15.59 μg/m3
PM10: 15.9 μg/m3
Carbon Monoxide: 308.33 μg/m3
Nitrogen Dioxide: 24.99 μg/m3
Sulphur Dioxide: 6.75 μg/m3
Ozone: 46.04 μg/m3

Astronomical

Sunrise: 6:46 AM
Sun Transit: 12:21 AM
Sunset: 5:59 PM
Daylight: 11 hrs 13 mins
Moonrise: 12:35 AM
Moon Transit: 8:35 PM
Moonset: 3:35 AM
Moon Phase: First Quarter
Moon Illumination: 72.9%

Best Times for Fishing or Hunting

Major Periods

9:20 AM - 11:50 AM
8:05 PM - 10:35 PM

Minor Periods

12:05 AM - 1:35 PM
3:05 AM - 4:35 AM

Action Rating: 2 out of 5

Friday, February 27, 2026

Weather Forecast

Moderate rain
43.1°F
32.9°F
40°F
82%
0.55 in
85%
0%
13.4 mph
0.8


Air Quality

AQI: 2 - Moderate
PM2.5: 22.39 μg/m3
PM10: 22.89 μg/m3
Carbon Monoxide: 307.91 μg/m3
Nitrogen Dioxide: 48.17 μg/m3
Sulphur Dioxide: 15.05 μg/m3
Ozone: 18.08 μg/m3

Astronomical

Sunrise: 6:44 AM
Sun Transit: 12:21 AM
Sunset: 6:00 PM
Daylight: 11 hrs 15 mins
Moonrise: 1:47 PM
Moon Transit: 9:34 PM
Moonset: 4:29 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 82.3%

Best Times for Fishing or Hunting

Major Periods

10:21 AM - 12:51 AM
9:04 PM - 11:34 PM

Minor Periods

1:17 PM - 2:47 PM
3:59 AM - 5:29 AM

Action Rating: 2 out of 5

Saturday, February 28, 2026

Weather Forecast

Sunny
54.8°F
29.6°F
38°F
79%
0 in
0%
0%
7.8 mph
0


Air Quality

AQI: 3 - Unhealthy for Sensitive Groups
PM2.5: 40.47 μg/m3
PM10: 41.22 μg/m3
Carbon Monoxide: 592.1 μg/m3
Nitrogen Dioxide: 66.97 μg/m3
Sulphur Dioxide: 17.33 μg/m3
Ozone: 2.77 μg/m3

Astronomical

Sunrise: 6:43 AM
Sun Transit: 12:21 AM
Sunset: 6:01 PM
Daylight: 11 hrs 18 mins
Moonrise: 3:01 PM
Moon Transit: 10:30 PM
Moonset: 5:12 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 90.1%

Best Times for Fishing or Hunting

Major Periods

11:19 AM - 1:49 PM
12:00 AM - 12:00 AM

Minor Periods

2:31 PM - 4:01 PM
4:42 AM - 6:12 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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