Water Temperature of Dead Run in McLean, VA

Current Water Temperature

42.1°F

Measurement Time: Wednesday, February 25, 2026, 6:00 PM EST

Temperature Locations

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Local Points of Interest

Dead Run; Langley Oaks Park

Dead Run

Station Name: DEAD RUN AT WHANN AVENUE NEAR MCLEAN, VA
Data Source: Water Data - usgc.gov

Elevation Above Sea Level: 226 feet

Nearest Address:
800 Whann Ave
McLean, VA 22101
Fairfax County

GPS Coordinates: 38.95977716, -77.1756743

Nearby Water Temperatures

Difficult Run, McLean, VA (3.9 mi)
Sligo Creek, Takoma Park, MD (9.4 mi)
Difficult Run, Oakton, VA (9.9 mi)
Washington Channel, Washington, DC (10.2 mi)
Paint Branch, Calverton, MD (12.4 mi)
Northeast Branch Anacostia River, Riverdale Park, MD (13.4 mi)
Patuxent River, Brighton, MD (18.5 mi)
Potomac River, Point of Rocks, MD (29.3 mi)
Carroll Creek, Frederick, MD (34.9 mi)
Scotts Level Branch, Milford Mill, MD (35.5 mi)
Carroll Creek, Frederick, MD (35.8 mi)
Severn River, Annapolis, MD (37.5 mi)
Northwest Harbor, Baltimore, MD (38.4 mi)
Chesapeake Bay, Annapolis, MD (39.1 mi)
Herring Run, Baltimore, MD (41.5 mi)

Weather for McLean, Virginia

Current Weather

42.1°F
Overcast
Overcast
38°F
47.8°F
70%
WSW 6.3 mph
13.2 mph
43.7°F
34.2°F
0 in
100%
9 mi
1008 mbar
0

Five Day Weather Forecast

Sunny
Wed
H: 58°F
L: 31°F
Overcast
Thu
H: 48°F
L: 32°F
Overcast
Fri
H: 42°F
L: 29°F
Cloudy
Sat
H: 60°F
L: 41°F
Overcast
Sun
H: 47°F
L: 36°F

Air Quality

AQI: 2 - Moderate
PM2.5: 21.15 μg/m3
PM10: 21.95 μg/m3
Carbon Monoxide: 251.85 μg/m3
Nitrogen Dioxide: 22.95 μg/m3
Sulphur Dioxide: 4.45 μg/m3
Ozone: 41 μg/m3

Astronomical

Sunrise: 6:47 AM
Sun Transit: 12:21 AM
Sunset: 5:57 PM
Daylight: 11 hrs 10 mins
Moonrise: 11:29 AM
Moon Transit: 7:32 PM
Moonset: 2:31 AM
Moon Phase: First Quarter
Moon Illumination: 62.3%

Best Times for Fishing or Hunting

Major Periods

8:18 AM - 10:48 AM
7:02 PM - 9:32 PM

Minor Periods

10:59 AM - 12:29 AM
2:01 AM - 3:31 AM

Action Rating: 2 out of 5

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

Effective: Wed February 25, 2026, 7:27 PM
Expires: Wed February 25, 2026, 7:37 PM

Monitoring message only. Please disregard.

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

Weather Forecast

Sunny
57.7°F
31.1°F
43.9°F
52%
0 in
0%
0%
12.1 mph
0.5


Air Quality

AQI: 1 - Good
PM2.5: 9.27 μg/m3
PM10: 9.65 μg/m3
Carbon Monoxide: 255.25 μg/m3
Nitrogen Dioxide: 18.75 μg/m3
Sulphur Dioxide: 5.21 μg/m3
Ozone: 63.92 μg/m3

Astronomical

Sunrise: 6:47 AM
Sun Transit: 12:21 AM
Sunset: 5:57 PM
Daylight: 11 hrs 10 mins
Moonrise: 11:29 AM
Moon Transit: 7:32 PM
Moonset: 2:31 AM
Moon Phase: First Quarter
Moon Illumination: 62.3%

Best Times for Fishing or Hunting

Major Periods

8:18 AM - 10:48 AM
7:02 PM - 9:32 PM

Minor Periods

10:59 AM - 12:29 AM
2:01 AM - 3:31 AM

Action Rating: 2 out of 5

Thursday, February 26, 2026

Weather Forecast

Overcast
48.4°F
32.1°F
41.9°F
75%
0 in
0%
0%
8.7 mph
0.2


Air Quality

AQI: 2 - Moderate
PM2.5: 19.05 μg/m3
PM10: 19.77 μg/m3
Carbon Monoxide: 312.13 μg/m3
Nitrogen Dioxide: 30.17 μg/m3
Sulphur Dioxide: 8.02 μg/m3
Ozone: 50 μg/m3

Astronomical

Sunrise: 6:46 AM
Sun Transit: 12:21 AM
Sunset: 5:58 PM
Daylight: 11 hrs 13 mins
Moonrise: 12:35 AM
Moon Transit: 8:34 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
8:04 PM - 10:34 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

Overcast
41.7°F
28.9°F
36.6°F
86%
0 in
0%
0%
7.6 mph
0.8


Air Quality

AQI: 2 - Moderate
PM2.5: 27.95 μg/m3
PM10: 29.15 μg/m3
Carbon Monoxide: 363.33 μg/m3
Nitrogen Dioxide: 33.91 μg/m3
Sulphur Dioxide: 9.65 μg/m3
Ozone: 37.52 μg/m3

Astronomical

Sunrise: 6:44 AM
Sun Transit: 12:21 AM
Sunset: 5:59 PM
Daylight: 11 hrs 15 mins
Moonrise: 1:46 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

1:16 PM - 2:46 PM
3:59 AM - 5:29 AM

Action Rating: 2 out of 5

Saturday, February 28, 2026

Weather Forecast

Cloudy
59.7°F
40.6°F
47.6°F
74%
0 in
0%
0%
7.4 mph
0.8


Air Quality

AQI: 2 - Moderate
PM2.5: 21.4 μg/m3
PM10: 22.25 μg/m3
Carbon Monoxide: 406.7 μg/m3
Nitrogen Dioxide: 29.09 μg/m3
Sulphur Dioxide: 8.26 μg/m3
Ozone: 44.04 μg/m3

Astronomical

Sunrise: 6:43 AM
Sun Transit: 12:21 AM
Sunset: 6:00 PM
Daylight: 11 hrs 18 mins
Moonrise: 3:01 PM
Moon Transit: 10:29 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

Sunday, March 1, 2026

Weather Forecast

Overcast
46.6°F
35.8°F
42.5°F
70%
0 in
0%
0%
11 mph
0.5


Air Quality

AQI: 2 - Moderate
PM2.5: 16.86 μg/m3
PM10: 17.22 μg/m3
Carbon Monoxide: 413.57 μg/m3
Nitrogen Dioxide: 50.69 μg/m3
Sulphur Dioxide: 9.54 μg/m3
Ozone: 26.62 μg/m3

Astronomical

Sunrise: 6:41 AM
Sun Transit: 12:21 AM
Sunset: 6:02 PM
Daylight: 11 hrs 20 mins
Moonrise: 4:14 PM
Moon Transit: 11:20 PM
Moonset: 5:46 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 95.8%

Best Times for Fishing or Hunting

Major Periods

12:12 AM - 2:42 PM
12:00 AM - 12:00 AM

Minor Periods

3:44 PM - 5:14 PM
5:16 AM - 6:46 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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