Water Temperature of Dead Run in McLean, VA

Current Water Temperature

74.7°F

Measurement Time: Tuesday, August 4, 2026, 9:30 AM 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

78.4°F
Patchy rain nearby
Patchy rain nearby
83.7°F
83.2°F
83%
SE 4.3 mph
6.9 mph
78.4°F
72.7°F
0 in
79%
6 mi
1019 mbar
0

Five Day Weather Forecast

Patchy rain nearby
Wed
H: 85°F
L: 74°F
Sunny
Thu
H: 95°F
L: 72°F
Sunny
Fri
H: 92°F
L: 72°F
Sunny
Sat
H: 92°F
L: 70°F
Sunny
Sun
H: 94°F
L: 73°F

Air Quality

AQI: 1 - Good
PM2.5: 8.4 μg/m3
PM10: 9.4 μg/m3
Carbon Monoxide: 176 μg/m3
Nitrogen Dioxide: 10.5 μg/m3
Sulphur Dioxide: 1.2 μg/m3
Ozone: 66 μg/m3

Astronomical

Sunrise: 6:13 AM
Sun Transit: 1:14 PM
Sunset: 8:16 PM
Daylight: 14 hrs 2 mins
Moonrise: 12:08 AM
Moon Transit: 6:14 AM
Moonset: 1:33 PM
Moon Phase: Last Quarter
Moon Illumination: 43.2%

Best Times for Fishing or Hunting

Major Periods

5:44 AM - 8:14 AM
7:56 PM - 10:26 PM

Minor Periods

1:03 PM - 2:33 PM
12:00 AM - 12:00 AM

Action Rating: 4 out of 5

Flood Watch issued August 4 at 9:02PM EDT until August 5 at 11:00AM EDT by NWS Baltimore MD/Washington DC

Effective: Tue August 4, 2026, 9:02 PM
Expires: Wed August 5, 2026, 5:15 AM

* WHAT...Flash flooding caused by excessive rainfall continues to be possible. * WHERE...Portions of DC, including the following , District of Columbia, Maryland, including the following areas, Central and Southeast Montgomery, Charles and Prince Georges, and Virginia, including the following areas, Arlington/Falls Church/Alexandria, Central and Southeast Prince William/Manassas/Manassas Park, Fairfax, Southern Fauquier, Spotsylvania and Stafford. * WHEN...From 4 AM EDT Wednesday through Wednesday morning. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. * ADDITIONAL DETAILS... - Showers and isolated thunderstorms are likely late tonight into Wednesday morning as a warm front lifts through the area. Rainfall will likely be heavy at times, with localized rainfall amounts around 2-4 inches within an hour or two possible. This may cause flash flooding in urban areas along with the possibility for creeks and streams to rise quickly out of their banks. - Please visit www.weather.gov/safety/flood for flood safety and preparedness information

You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued.
Wednesday, August 5, 2026

Weather Forecast

Patchy rain nearby
84.5°F
74.1°F
78.4°F
85%
1.12 in
87%
0%
6.5 mph
8.7


Air Quality

AQI: 1 - Good
PM2.5: 5.33 μg/m3
PM10: 5.57 μg/m3
Carbon Monoxide: 152.25 μg/m3
Nitrogen Dioxide: 7.29 μg/m3
Sulphur Dioxide: 1.16 μg/m3
Ozone: 75.21 μg/m3

Astronomical

Sunrise: 6:13 AM
Sun Transit: 1:14 PM
Sunset: 8:16 PM
Daylight: 14 hrs 2 mins
Moonrise: 12:08 AM
Moon Transit: 6:14 AM
Moonset: 1:33 PM
Moon Phase: Last Quarter
Moon Illumination: 43.2%

Best Times for Fishing or Hunting

Major Periods

5:44 AM - 8:14 AM
7:56 PM - 10:26 PM

Minor Periods

1:03 PM - 2:33 PM
12:00 AM - 12:00 AM

Action Rating: 4 out of 5

Thursday, August 6, 2026

Weather Forecast

Sunny
95°F
71.5°F
81°F
72%
0.04 in
57%
0%
9.2 mph
9.4


Air Quality

AQI: 1 - Good
PM2.5: 5.67 μg/m3
PM10: 5.75 μg/m3
Carbon Monoxide: 159.96 μg/m3
Nitrogen Dioxide: 7.78 μg/m3
Sulphur Dioxide: 1.1 μg/m3
Ozone: 78.25 μg/m3

Astronomical

Sunrise: 6:14 AM
Sun Transit: 1:14 PM
Sunset: 8:15 PM
Daylight: 14 hrs mins
Moonrise: 12:40 AM
Moon Transit: 7:07 AM
Moonset: 2:48 PM
Moon Phase: Last Quarter
Moon Illumination: 32.3%

Best Times for Fishing or Hunting

Major Periods

6:37 AM - 9:07 AM
8:53 PM - 11:23 PM

Minor Periods

2:18 PM - 3:48 PM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

Friday, August 7, 2026

Weather Forecast

Sunny
91.8°F
71.6°F
80°F
72%
0.68 in
71%
0%
14.8 mph
8


Air Quality

AQI: 1 - Good
PM2.5: 7.84 μg/m3
PM10: 7.94 μg/m3
Carbon Monoxide: 177.67 μg/m3
Nitrogen Dioxide: 8.43 μg/m3
Sulphur Dioxide: 1.1 μg/m3
Ozone: 85.46 μg/m3

Astronomical

Sunrise: 6:15 AM
Sun Transit: 1:14 PM
Sunset: 8:14 PM
Daylight: 13 hrs 58 mins
Moonrise: 12:20 AM
Moon Transit: 8:06 AM
Moonset: 4:01 PM
Moon Phase: Last Quarter
Moon Illumination: 22.2%

Best Times for Fishing or Hunting

Major Periods

7:36 AM - 10:06 AM
12:00 AM - 12:00 AM

Minor Periods

3:31 PM - 5:01 PM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Saturday, August 8, 2026

Weather Forecast

Sunny
92.3°F
69.5°F
79.8°F
70%
0.01 in
17%
0%
9.6 mph
8


Air Quality

AQI: 1 - Good
PM2.5: 7.73 μg/m3
PM10: 7.88 μg/m3
Carbon Monoxide: 185.85 μg/m3
Nitrogen Dioxide: 11.39 μg/m3
Sulphur Dioxide: 1.02 μg/m3
Ozone: 74.08 μg/m3

Astronomical

Sunrise: 6:16 AM
Sun Transit: 1:14 PM
Sunset: 8:12 PM
Daylight: 13 hrs 56 mins
Moonrise: 1:10 AM
Moon Transit: 9:09 AM
Moonset: 5:11 PM
Moon Phase: Waning Crescent
Moon Illumination: 13.6%

Best Times for Fishing or Hunting

Major Periods

8:39 AM - 11:09 AM
12:00 AM - 12:00 AM

Minor Periods

4:41 PM - 6:11 PM
12:40 AM - 2:10 AM

Action Rating: 2 out of 5

Sunday, August 9, 2026

Weather Forecast

Sunny
94°F
72.5°F
81.4°F
67%
0.09 in
57%
0%
8.1 mph
8


Air Quality

AQI: 1 - Good
PM2.5: 8.77 μg/m3
PM10: 9.1 μg/m3
Carbon Monoxide: 221.56 μg/m3
Nitrogen Dioxide: 11.18 μg/m3
Sulphur Dioxide: 1.09 μg/m3
Ozone: 40.22 μg/m3

Astronomical

Sunrise: 6:17 AM
Sun Transit: 1:14 PM
Sunset: 8:11 PM
Daylight: 13 hrs 54 mins
Moonrise: 2:12 AM
Moon Transit: 10:14 AM
Moonset: 6:12 PM
Moon Phase: Waning Crescent
Moon Illumination: 6.8%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
9:44 AM - 12:14 AM

Minor Periods

5:42 PM - 7:12 PM
1:42 AM - 3:12 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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