Water Temperature of Difficult Run in McLean, VA

Current Water Temperature

35.8°F

Measurement Time: Tuesday, February 17, 2026, 8:15 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

46.9°F
Partly cloudy
Partly cloudy
46.5°F
51.8°F
71%
SSW 2.7 mph
3.2 mph
52.3°F
44.9°F
0 in
75%
9 mi
1020 mbar
2.2

Five Day Weather Forecast

Partly Cloudy
Tue
H: 57°F
L: 32°F
Fog
Wed
H: 42°F
L: 35°F
Moderate rain
Thu
H: 44°F
L: 36°F
Moderate rain
Fri
H: 64°F
L: 36°F
Cloudy
Sat
H: 50°F
L: 40°F

Air Quality

AQI: 1 - Good
PM2.5: 32.85 μg/m3
PM10: 33.25 μg/m3
Carbon Monoxide: 599.85 μg/m3
Nitrogen Dioxide: 72.85 μg/m3
Sulphur Dioxide: 12.45 μg/m3
Ozone: 6 μg/m3

Astronomical

Sunrise: 6:58 AM
Sun Transit: 12:22 AM
Sunset: 5:49 PM
Daylight: 10 hrs 51 mins
Moonrise: 7:07 AM
Moon Transit: 12:34 AM
Moonset: 6:12 PM
Moon Phase: New
Moon Illumination: 0.0%

Best Times for Fishing or Hunting

Major Periods

1:26 AM - 3:56 AM
12:04 AM - 2:34 PM

Minor Periods

5:42 PM - 7:12 PM
6:37 AM - 8:07 AM

Action Rating: 5 out of 5

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

Effective: Tue February 17, 2026, 1:27 PM
Expires: Tue February 17, 2026, 1:37 PM

Monitoring message only. Please disregard.

Monitoring message only. Please disregard.
Tuesday, February 17, 2026

Weather Forecast

Partly Cloudy
57°F
31.6°F
41.5°F
88%
0 in
0%
0%
5.4 mph
0.7


Air Quality

AQI: 2 - Moderate
PM2.5: 23.62 μg/m3
PM10: 23.89 μg/m3
Carbon Monoxide: 419.45 μg/m3
Nitrogen Dioxide: 42.7 μg/m3
Sulphur Dioxide: 9.54 μg/m3
Ozone: 29.68 μg/m3

Astronomical

Sunrise: 6:58 AM
Sun Transit: 12:22 AM
Sunset: 5:49 PM
Daylight: 10 hrs 51 mins
Moonrise: 7:07 AM
Moon Transit: 12:34 AM
Moonset: 6:12 PM
Moon Phase: New
Moon Illumination: 0.0%

Best Times for Fishing or Hunting

Major Periods

1:26 AM - 3:56 AM
12:04 AM - 2:34 PM

Minor Periods

5:42 PM - 7:12 PM
6:37 AM - 8:07 AM

Action Rating: 5 out of 5

Wednesday, February 18, 2026

Weather Forecast

Fog
41.9°F
35.4°F
39°F
99%
0 in
0%
0%
10.5 mph
0.3


Air Quality

AQI: 2 - Moderate
PM2.5: 22.48 μg/m3
PM10: 22.69 μg/m3
Carbon Monoxide: 334.49 μg/m3
Nitrogen Dioxide: 35.29 μg/m3
Sulphur Dioxide: 8.94 μg/m3
Ozone: 35.44 μg/m3

Astronomical

Sunrise: 6:57 AM
Sun Transit: 12:22 AM
Sunset: 5:50 PM
Daylight: 10 hrs 53 mins
Moonrise: 7:32 AM
Moon Transit: 1:20 PM
Moonset: 7:19 PM
Moon Phase: New
Moon Illumination: 1.3%

Best Times for Fishing or Hunting

Major Periods

2:12 AM - 4:42 AM
12:50 AM - 3:20 PM

Minor Periods

6:49 PM - 8:19 PM
7:02 AM - 8:32 AM

Action Rating: 4 out of 5

Thursday, February 19, 2026

Weather Forecast

Moderate rain
43.7°F
36.1°F
39.5°F
99%
0.21 in
65%
0%
10.1 mph
0.6


Air Quality

AQI: 1 - Good
PM2.5: 11.17 μg/m3
PM10: 11.55 μg/m3
Carbon Monoxide: 244.01 μg/m3
Nitrogen Dioxide: 17.6 μg/m3
Sulphur Dioxide: 6.23 μg/m3
Ozone: 55.04 μg/m3

Astronomical

Sunrise: 6:55 AM
Sun Transit: 12:22 AM
Sunset: 5:51 PM
Daylight: 10 hrs 56 mins
Moonrise: 7:55 AM
Moon Transit: 4:07 PM
Moonset: 8:28 PM
Moon Phase: Waxing Crescent
Moon Illumination: 5.2%

Best Times for Fishing or Hunting

Major Periods

3:37 PM - 6:07 PM
3:37 PM - 6:07 PM

Minor Periods

7:58 PM - 9:28 PM
7:25 AM - 8:55 AM

Action Rating: 4 out of 5

Friday, February 20, 2026

Weather Forecast

Moderate rain
64.4°F
36.1°F
42.9°F
84%
0.59 in
89%
0%
16.3 mph
0.3


Air Quality

AQI: 1 - Good
PM2.5: 8.71 μg/m3
PM10: 9.16 μg/m3
Carbon Monoxide: 314.08 μg/m3
Nitrogen Dioxide: 26.07 μg/m3
Sulphur Dioxide: 5.9 μg/m3
Ozone: 41.8 μg/m3

Astronomical

Sunrise: 6:54 AM
Sun Transit: 12:22 AM
Sunset: 5:52 PM
Daylight: 10 hrs 58 mins
Moonrise: 8:20 AM
Moon Transit: 12:00 AM
Moonset: 9:38 PM
Moon Phase: Waxing Crescent
Moon Illumination: 11.3%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
3:44 AM - 6:14 AM

Minor Periods

9:08 PM - 10:38 PM
7:50 AM - 9:20 AM

Action Rating: 2 out of 5

Saturday, February 21, 2026

Weather Forecast

Cloudy
49.8°F
39.7°F
43.9°F
59%
0 in
0%
0%
11.9 mph
0


Air Quality

AQI: 1 - Good
PM2.5: 9.56 μg/m3
PM10: 9.73 μg/m3
Carbon Monoxide: 297.89 μg/m3
Nitrogen Dioxide: 23.16 μg/m3
Sulphur Dioxide: 6.29 μg/m3
Ozone: 29.54 μg/m3

Astronomical

Sunrise: 6:53 AM
Sun Transit: 12:22 AM
Sunset: 5:53 PM
Daylight: 11 hrs mins
Moonrise: 8:46 AM
Moon Transit: 3:41 PM
Moonset: 10:50 PM
Moon Phase: Waxing Crescent
Moon Illumination: 19.4%

Best Times for Fishing or Hunting

Major Periods

4:32 AM - 7:02 AM
3:11 PM - 5:41 PM

Minor Periods

10:20 PM - 11:50 PM
8:16 AM - 9:46 AM

Action Rating: 4 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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