Water Temperature of Dead Run in McLean, VA

Current Water Temperature

72.5°F

Measurement Time: Wednesday, July 29, 2026, 8:15 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

74.2°F
Cloudy
Cloudy
77.4°F
75.9°F
61%
WNW 7.6 mph
12.4 mph
70°F
59.6°F
0 in
75%
10 mi
998 mbar
0

Five Day Weather Forecast

Sunny
Thu
H: 87°F
L: 67°F
Sunny
Fri
H: 89°F
L: 67°F
Sunny
Sat
H: 92°F
L: 69°F
Partly Cloudy
Sun
H: 77°F
L: 70°F
Partly Cloudy
Mon
H: 78°F
L: 69°F

Air Quality

AQI: 1 - Good
PM2.5: 6.4 μg/m3
PM10: 6.6 μg/m3
Carbon Monoxide: 140 μg/m3
Nitrogen Dioxide: 7.8 μg/m3
Sulphur Dioxide: 1.7 μg/m3
Ozone: 70 μg/m3

Astronomical

Sunrise: 6:08 AM
Sun Transit: 1:15 PM
Sunset: 8:22 PM
Daylight: 14 hrs 14 mins
Moonrise: 9:08 PM
Moon Transit: 1:45 AM
Moonset: 6:58 AM
Moon Phase: Full
Moon Illumination: 97.1%

Best Times for Fishing or Hunting

Major Periods

1:15 AM - 3:45 AM
3:23 PM - 5:53 PM

Minor Periods

8:38 PM - 10:08 PM
6:28 AM - 7:58 AM

Action Rating: 5 out of 5

Small Craft Advisory issued July 29 at 2:33PM EDT until July 29 at 8:00PM EDT by NWS Baltimore MD/Washington DC

Effective: Wed July 29, 2026, 2:33 PM
Expires: Wed July 29, 2026, 10:45 PM

* WHAT...For the first Small Craft Advisory, northwest winds 10 to 15 kt with gusts up to 20 kt. For the second Small Craft Advisory, northwest winds around 10 kt with gusts up to 20 kt expected. * WHERE...Tidal Potomac from Key Bridge to Indian Head MD and Patapsco River including Baltimore Harbor. * WHEN...For the first Small Craft Advisory, until 8 PM EDT this evening. For the second Small Craft Advisory, from 8 AM to 6 PM EDT Thursday. * IMPACTS...Conditions will be hazardous to small craft.

Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions.


Small Craft Advisory issued July 29 at 2:33PM EDT until July 30 at 6:00PM EDT by NWS Baltimore MD/Washington DC

Effective: Wed July 29, 2026, 2:33 PM
Expires: Wed July 29, 2026, 10:45 PM

* WHAT...For the first Small Craft Advisory, northwest winds 10 to 15 kt with gusts up to 20 kt. For the second Small Craft Advisory, northwest winds around 10 kt with gusts up to 20 kt expected. * WHERE...Tidal Potomac from Key Bridge to Indian Head MD and Patapsco River including Baltimore Harbor. * WHEN...For the first Small Craft Advisory, until 8 PM EDT this evening. For the second Small Craft Advisory, from 8 AM to 6 PM EDT Thursday. * IMPACTS...Conditions will be hazardous to small craft.

Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions.
Thursday, July 30, 2026

Weather Forecast

Sunny
86.5°F
66.9°F
75.3°F
59%
0 in
4%
0%
12.5 mph
8.9


Air Quality

AQI: 1 - Good
PM2.5: 6.4 μg/m3
PM10: 6.56 μg/m3
Carbon Monoxide: 141.29 μg/m3
Nitrogen Dioxide: 6.56 μg/m3
Sulphur Dioxide: 1.43 μg/m3
Ozone: 81.08 μg/m3

Astronomical

Sunrise: 6:08 AM
Sun Transit: 1:15 PM
Sunset: 8:22 PM
Daylight: 14 hrs 14 mins
Moonrise: 9:08 PM
Moon Transit: 1:45 AM
Moonset: 6:58 AM
Moon Phase: Full
Moon Illumination: 97.1%

Best Times for Fishing or Hunting

Major Periods

1:15 AM - 3:45 AM
3:23 PM - 5:53 PM

Minor Periods

8:38 PM - 10:08 PM
6:28 AM - 7:58 AM

Action Rating: 5 out of 5

Friday, July 31, 2026

Weather Forecast

Sunny
89.1°F
66.9°F
78°F
56%
0 in
3%
0%
5.4 mph
8.8


Air Quality

AQI: 1 - Good
PM2.5: 7.47 μg/m3
PM10: 7.58 μg/m3
Carbon Monoxide: 156.88 μg/m3
Nitrogen Dioxide: 10.19 μg/m3
Sulphur Dioxide: 1.87 μg/m3
Ozone: 83 μg/m3

Astronomical

Sunrise: 6:09 AM
Sun Transit: 1:15 PM
Sunset: 8:21 PM
Daylight: 14 hrs 12 mins
Moonrise: 9:31 PM
Moon Transit: 2:30 AM
Moonset: 8:01 AM
Moon Phase: Full
Moon Illumination: 92.0%

Best Times for Fishing or Hunting

Major Periods

2:00 AM - 4:30 AM
4:07 PM - 6:37 PM

Minor Periods

9:01 PM - 10:31 PM
7:31 AM - 9:01 AM

Action Rating: 3 out of 5

Saturday, August 1, 2026

Weather Forecast

Sunny
92°F
69.4°F
79.6°F
59%
0 in
6%
0%
13.2 mph
9.1


Air Quality

AQI: 1 - Good
PM2.5: 11.08 μg/m3
PM10: 11.25 μg/m3
Carbon Monoxide: 148.71 μg/m3
Nitrogen Dioxide: 7.45 μg/m3
Sulphur Dioxide: 2.37 μg/m3
Ozone: 96.83 μg/m3

Astronomical

Sunrise: 6:10 AM
Sun Transit: 1:15 PM
Sunset: 8:20 PM
Daylight: 14 hrs 10 mins
Moonrise: 9:54 PM
Moon Transit: 3:13 AM
Moonset: 9:05 AM
Moon Phase: Waning Gibbous
Moon Illumination: 84.9%

Best Times for Fishing or Hunting

Major Periods

2:43 AM - 5:13 AM
4:50 PM - 7:20 PM

Minor Periods

9:24 PM - 10:54 PM
8:35 AM - 10:05 AM

Action Rating: 2 out of 5

Sunday, August 2, 2026

Weather Forecast

Partly Cloudy
76.9°F
69.9°F
73°F
81%
0.29 in
78%
0%
10.3 mph
6


Air Quality

AQI: 1 - Good
PM2.5: 8 μg/m3
PM10: 8.99 μg/m3
Carbon Monoxide: 146.98 μg/m3
Nitrogen Dioxide: 4.94 μg/m3
Sulphur Dioxide: 1.7 μg/m3
Ozone: 86.17 μg/m3

Astronomical

Sunrise: 6:11 AM
Sun Transit: 1:15 PM
Sunset: 8:19 PM
Daylight: 14 hrs 8 mins
Moonrise: 10:17 PM
Moon Transit: 3:56 AM
Moonset: 10:09 AM
Moon Phase: Waning Gibbous
Moon Illumination: 75.9%

Best Times for Fishing or Hunting

Major Periods

3:26 AM - 5:56 AM
5:33 PM - 8:03 PM

Minor Periods

9:47 PM - 11:17 PM
9:39 AM - 11:09 AM

Action Rating: 4 out of 5

Monday, August 3, 2026

Weather Forecast

Partly Cloudy
77.6°F
69.3°F
72.4°F
85%
0.12 in
77%
0%
8.3 mph
7


Air Quality

AQI: 1 - Good
PM2.5: 10.62 μg/m3
PM10: 11.42 μg/m3
Carbon Monoxide: 279.22 μg/m3
Nitrogen Dioxide: 16.76 μg/m3
Sulphur Dioxide: 1.92 μg/m3
Ozone: 37.56 μg/m3

Astronomical

Sunrise: 6:12 AM
Sun Transit: 1:14 PM
Sunset: 8:18 PM
Daylight: 14 hrs 6 mins
Moonrise: 10:41 PM
Moon Transit: 12:00 AM
Moonset: 11:14 AM
Moon Phase: Waning Gibbous
Moon Illumination: 65.6%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
12:00 AM - 12:00 AM

Minor Periods

10:11 PM - 11:41 PM
10:44 AM - 12:14 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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