Water Temperature of Dead Run in McLean, VA

Current Water Temperature

76.8°F

Measurement Time: Tuesday, July 21, 2026, 7:15 PM EDT

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

73.9°F
Overcast
Overcast
78.2°F
79.8°F
91%
SSW 7.8 mph
16.4 mph
75.2°F
73.3°F
0.27 in
100%
9 mi
1008 mbar
0

Five Day Weather Forecast

Sunny
Wed
H: 89°F
L: 71°F
Sunny
Thu
H: 80°F
L: 63°F
Sunny
Fri
H: 81°F
L: 62°F
Partly Cloudy
Sat
H: 78°F
L: 66°F
Partly Cloudy
Sun
H: 85°F
L: 65°F

Air Quality

AQI: 1 - Good
PM2.5: 7.3 μg/m3
PM10: 7.8 μg/m3
Carbon Monoxide: 123 μg/m3
Nitrogen Dioxide: 5.4 μg/m3
Sulphur Dioxide: 0.8 μg/m3
Ozone: 76 μg/m3

Astronomical

Sunrise: 6:01 AM
Sun Transit: 1:15 PM
Sunset: 8:29 PM
Daylight: 14 hrs 28 mins
Moonrise: 3:04 PM
Moon Transit: 8:00 PM
Moonset: 12:19 AM
Moon Phase: First Quarter
Moon Illumination: 55.0%

Best Times for Fishing or Hunting

Major Periods

8:52 AM - 11:22 AM
7:30 PM - 10:00 PM

Minor Periods

2:34 PM - 4:04 PM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Small Craft Advisory issued July 21 at 5:05PM EDT until July 22 at 4:00AM EDT by NWS Baltimore MD/Washington DC

Effective: Tue July 21, 2026, 5:05 PM
Expires: Wed July 22, 2026, 1:15 AM

* WHAT...Southwest winds 10 to 15 kt with gusts up to 25 kt. * WHERE...Tidal Potomac River from Key Bridge to Cobb Island MD. * WHEN...Until 4 AM EDT Wednesday. * IMPACTS...Conditions will be hazardous to small craft.

Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions.
Wednesday, July 22, 2026

Weather Forecast

Sunny
89.1°F
70.7°F
78.2°F
69%
0.26 in
63%
0%
10.7 mph
7.8


Air Quality

AQI: 1 - Good
PM2.5: 9.2 μg/m3
PM10: 9.43 μg/m3
Carbon Monoxide: 142.63 μg/m3
Nitrogen Dioxide: 10.93 μg/m3
Sulphur Dioxide: 1.38 μg/m3
Ozone: 78.17 μg/m3

Astronomical

Sunrise: 6:01 AM
Sun Transit: 1:15 PM
Sunset: 8:29 PM
Daylight: 14 hrs 28 mins
Moonrise: 3:04 PM
Moon Transit: 8:00 PM
Moonset: 12:19 AM
Moon Phase: First Quarter
Moon Illumination: 55.0%

Best Times for Fishing or Hunting

Major Periods

8:52 AM - 11:22 AM
7:30 PM - 10:00 PM

Minor Periods

2:34 PM - 4:04 PM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Thursday, July 23, 2026

Weather Forecast

Sunny
80.3°F
63.1°F
71.6°F
51%
0 in
2%
0%
8.9 mph
9


Air Quality

AQI: 1 - Good
PM2.5: 8.67 μg/m3
PM10: 8.85 μg/m3
Carbon Monoxide: 148.38 μg/m3
Nitrogen Dioxide: 11.42 μg/m3
Sulphur Dioxide: 1.58 μg/m3
Ozone: 81.46 μg/m3

Astronomical

Sunrise: 6:02 AM
Sun Transit: 1:15 PM
Sunset: 8:28 PM
Daylight: 14 hrs 26 mins
Moonrise: 4:06 PM
Moon Transit: 8:47 PM
Moonset: 12:49 AM
Moon Phase: First Quarter
Moon Illumination: 66.1%

Best Times for Fishing or Hunting

Major Periods

9:39 AM - 12:09 AM
8:17 PM - 10:47 PM

Minor Periods

3:36 PM - 5:06 PM
12:19 AM - 1:49 AM

Action Rating: 3 out of 5

Friday, July 24, 2026

Weather Forecast

Sunny
81.3°F
61.8°F
70.6°F
57%
0 in
4%
0%
7.8 mph
9.4


Air Quality

AQI: 1 - Good
PM2.5: 13.36 μg/m3
PM10: 14.22 μg/m3
Carbon Monoxide: 192.96 μg/m3
Nitrogen Dioxide: 20.22 μg/m3
Sulphur Dioxide: 1.9 μg/m3
Ozone: 78.25 μg/m3

Astronomical

Sunrise: 6:03 AM
Sun Transit: 1:15 PM
Sunset: 8:28 PM
Daylight: 14 hrs 25 mins
Moonrise: 5:06 PM
Moon Transit: 9:37 PM
Moonset: 1:24 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 76.3%

Best Times for Fishing or Hunting

Major Periods

10:28 AM - 12:58 AM
9:07 PM - 11:37 PM

Minor Periods

4:36 PM - 6:06 PM
12:54 AM - 2:24 AM

Action Rating: 2 out of 5

Saturday, July 25, 2026

Weather Forecast

Partly Cloudy
78.2°F
65.6°F
70°F
64%
0 in
6%
0%
5.6 mph
7


Air Quality

AQI: 1 - Good
PM2.5: 12.03 μg/m3
PM10: 14.36 μg/m3
Carbon Monoxide: 141.17 μg/m3
Nitrogen Dioxide: 13.26 μg/m3
Sulphur Dioxide: 1.43 μg/m3
Ozone: 81 μg/m3

Astronomical

Sunrise: 6:04 AM
Sun Transit: 1:15 PM
Sunset: 8:27 PM
Daylight: 14 hrs 23 mins
Moonrise: 6:02 PM
Moon Transit: 10:28 PM
Moonset: 2:06 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 85.2%

Best Times for Fishing or Hunting

Major Periods

11:18 AM - 1:48 PM
12:00 AM - 12:00 AM

Minor Periods

5:32 PM - 7:02 PM
1:36 AM - 3:06 AM

Action Rating: 2 out of 5

Sunday, July 26, 2026

Weather Forecast

Partly Cloudy
84.7°F
65.4°F
74.7°F
53%
0 in
4%
0%
4.9 mph
7


Air Quality

AQI: 1 - Good
PM2.5: 13.18 μg/m3
PM10: 14.94 μg/m3
Carbon Monoxide: 206 μg/m3
Nitrogen Dioxide: 21.3 μg/m3
Sulphur Dioxide: 1.38 μg/m3
Ozone: 42.56 μg/m3

Astronomical

Sunrise: 6:04 AM
Sun Transit: 1:15 PM
Sunset: 8:26 PM
Daylight: 14 hrs 21 mins
Moonrise: 6:52 PM
Moon Transit: 11:19 PM
Moonset: 2:55 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 92.3%

Best Times for Fishing or Hunting

Major Periods

12:10 AM - 2:40 PM
12:00 AM - 12:00 AM

Minor Periods

6:22 PM - 7:52 PM
2:25 AM - 3:55 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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