Water Temperature of Dead Run in McLean, VA

Current Water Temperature

64.9°F

Measurement Time: Monday, May 18, 2026, 12:00 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

63°F
Clear
Clear
63°F
68.8°F
90%
SSW 3.4 mph
7 mph
68.2°F
60°F
0 in
0%
9 mi
1020 mbar
0

Five Day Weather Forecast

Patchy rain nearby
Mon
H: 102°F
L: 66°F
Sunny
Tue
H: 96°F
L: 65°F
Moderate rain
Wed
H: 92°F
L: 64°F
Patchy rain nearby
Thu
H: 67°F
L: 52°F
Moderate rain
Fri
H: 58°F
L: 53°F

Air Quality

AQI: 1 - Good
PM2.5: 12.05 μg/m3
PM10: 12.75 μg/m3
Carbon Monoxide: 242.85 μg/m3
Nitrogen Dioxide: 12.95 μg/m3
Sulphur Dioxide: 2.85 μg/m3
Ozone: 72 μg/m3

Astronomical

Sunrise: 5:53 AM
Sun Transit: 1:05 PM
Sunset: 8:18 PM
Daylight: 14 hrs 24 mins
Moonrise: 7:01 AM
Moon Transit: 3:03 PM
Moonset: 11:06 PM
Moon Phase: New
Moon Illumination: 2.6%

Best Times for Fishing or Hunting

Major Periods

3:47 AM - 6:17 AM
2:33 PM - 5:03 PM

Minor Periods

12:00 AM - 12:00 AM
6:31 AM - 8:01 AM

Action Rating: 4 out of 5

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

Effective: Mon May 18, 2026, 2:27 AM
Expires: Mon May 18, 2026, 2:37 AM

Monitoring message only. Please disregard.

Monitoring message only. Please disregard.


Air Quality Alert issued May 17 at 4:40PM EDT by NWS Baltimore MD/Washington DC

Non-Weather Emergency Message. Not sent to IPAWS.

Effective: Sun May 17, 2026, 4:40 PM
Expires: Tue May 19, 2026, 12:00 AM

The Maryland Department of the Environment has issued a Code ORANGE Air Quality Alert Monday for the Baltimore City Metro and Annapolis region. A Code Orange Air Quality Alert means that air pollution concentrations within the region may become unhealthy for sensitive groups. Sensitive groups include children, people suffering from asthma, heart disease or other lung diseases and the elderly. The effects of air pollution can be minimized by avoiding strenuous activity or exercise outdoors. For more information on ground-level ozone and fine particles visit the web site mde.maryland.gov/programs/air/AirQualityMonitoring/Pages/index.aspx.


Air Quality Alert issued May 17 at 4:40PM EDT by NWS Baltimore MD/Washington DC

Non-Weather Emergency Message. Not sent to IPAWS.

Effective: Sun May 17, 2026, 4:40 PM
Expires: Tue May 19, 2026, 12:00 AM

The Maryland Department of the Environment has issued a Code ORANGE Air Quality Alert Monday for Northern Baltimore. A Code Orange Air Quality Alert means that air pollution concentrations within the region may become unhealthy for sensitive groups. Sensitive groups include children, people suffering from asthma, heart disease or other lung diseases and the elderly. The effects of air pollution can be minimized by avoiding strenuous activity or exercise outdoors. For more information on ground-level ozone and fine particles visit the web site mde.maryland.gov/programs/air/AirQualityMonitoring/Pages/index.aspx.


Monday, May 18, 2026

Weather Forecast

Patchy rain nearby
102.4°F
65.8°F
82.2°F
56%
0.07 in
86%
0%
8.3 mph
9


Air Quality

AQI: 1 - Good
PM2.5: 11.38 μg/m3
PM10: 12.98 μg/m3
Carbon Monoxide: 221.33 μg/m3
Nitrogen Dioxide: 9.9 μg/m3
Sulphur Dioxide: 2.22 μg/m3
Ozone: 99.72 μg/m3

Astronomical

Sunrise: 5:53 AM
Sun Transit: 1:05 PM
Sunset: 8:18 PM
Daylight: 14 hrs 24 mins
Moonrise: 7:01 AM
Moon Transit: 3:03 PM
Moonset: 11:06 PM
Moon Phase: New
Moon Illumination: 2.6%

Best Times for Fishing or Hunting

Major Periods

3:47 AM - 6:17 AM
2:33 PM - 5:03 PM

Minor Periods

12:00 AM - 12:00 AM
6:31 AM - 8:01 AM

Action Rating: 4 out of 5

Tuesday, May 19, 2026

Weather Forecast

Sunny
95.7°F
64.9°F
80.5°F
55%
0 in
0%
0%
9.6 mph
9


Air Quality

AQI: 1 - Good
PM2.5: 8.24 μg/m3
PM10: 10.24 μg/m3
Carbon Monoxide: 164.65 μg/m3
Nitrogen Dioxide: 5.41 μg/m3
Sulphur Dioxide: 1.89 μg/m3
Ozone: 105.84 μg/m3

Astronomical

Sunrise: 5:53 AM
Sun Transit: 1:05 PM
Sunset: 8:18 PM
Daylight: 14 hrs 26 mins
Moonrise: 8:10 AM
Moon Transit: 4:09 PM
Moonset: 12:06 AM
Moon Phase: Waxing Crescent
Moon Illumination: 7.4%

Best Times for Fishing or Hunting

Major Periods

4:54 AM - 7:24 AM
3:39 PM - 6:09 PM

Minor Periods

7:40 AM - 9:10 AM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Wednesday, May 20, 2026

Weather Forecast

Moderate rain
92°F
64.3°F
75.6°F
63%
0.38 in
76%
0%
10.1 mph
9.5


Air Quality

AQI: 1 - Good
PM2.5: 7.7 μg/m3
PM10: 8.95 μg/m3
Carbon Monoxide: 164.49 μg/m3
Nitrogen Dioxide: 7.12 μg/m3
Sulphur Dioxide: 2.03 μg/m3
Ozone: 92.8 μg/m3

Astronomical

Sunrise: 5:52 AM
Sun Transit: 1:05 PM
Sunset: 8:19 PM
Daylight: 14 hrs 28 mins
Moonrise: 9:25 AM
Moon Transit: 5:11 PM
Moonset: 12:03 AM
Moon Phase: Waxing Crescent
Moon Illumination: 14.4%

Best Times for Fishing or Hunting

Major Periods

5:58 AM - 8:28 AM
4:41 PM - 7:11 PM

Minor Periods

8:55 AM - 10:25 AM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

Thursday, May 21, 2026

Weather Forecast

Patchy rain nearby
66.7°F
52.2°F
60.5°F
65%
0.01 in
87%
0%
8.5 mph
0.4


Air Quality

AQI: 1 - Good
PM2.5: 6.4 μg/m3
PM10: 6.58 μg/m3
Carbon Monoxide: 187.43 μg/m3
Nitrogen Dioxide: 11.54 μg/m3
Sulphur Dioxide: 2.4 μg/m3
Ozone: 57.8 μg/m3

Astronomical

Sunrise: 5:51 AM
Sun Transit: 1:05 PM
Sunset: 8:20 PM
Daylight: 14 hrs 29 mins
Moonrise: 10:41 AM
Moon Transit: 6:07 PM
Moonset: 12:48 AM
Moon Phase: Waxing Crescent
Moon Illumination: 23.2%

Best Times for Fishing or Hunting

Major Periods

6:57 AM - 9:27 AM
5:37 PM - 8:07 PM

Minor Periods

10:11 AM - 11:41 AM
12:18 AM - 1:48 AM

Action Rating: 3 out of 5

Friday, May 22, 2026

Weather Forecast

Moderate rain
57.5°F
52.7°F
54.6°F
95%
0.36 in
79%
0%
8.1 mph
3


Air Quality

AQI: 1 - Good
PM2.5: 11.62 μg/m3
PM10: 12.22 μg/m3
Carbon Monoxide: 244.89 μg/m3
Nitrogen Dioxide: 23.88 μg/m3
Sulphur Dioxide: 2.73 μg/m3
Ozone: 39.08 μg/m3

Astronomical

Sunrise: 5:50 AM
Sun Transit: 1:05 PM
Sunset: 8:21 PM
Daylight: 14 hrs 31 mins
Moonrise: 11:54 AM
Moon Transit: 6:58 PM
Moonset: 1:22 AM
Moon Phase: Waxing Crescent
Moon Illumination: 33.4%

Best Times for Fishing or Hunting

Major Periods

7:50 AM - 10:20 AM
6:28 PM - 8:58 PM

Minor Periods

11:24 AM - 12:54 AM
12:52 AM - 2:22 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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