Water Temperature of Dead Run in McLean, VA

Current Water Temperature

77.0°F

Measurement Time: Friday, July 17, 2026, 4:15 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

84.9°F
Overcast
Overcast
85.2°F
85.6°F
50%
SE 2.2 mph
2.8 mph
85.3°F
59.1°F
0 in
100%
2 mi
1016 mbar
0

Five Day Weather Forecast

Smoky haze
Fri
H: 98°F
L: 73°F
Sunny
Sat
H: 92°F
L: 74°F
Sunny
Sun
H: 86°F
L: 72°F
Sunny
Mon
H: 87°F
L: 66°F
Patchy rain nearby
Tue
H: 88°F
L: 70°F

Air Quality

AQI: 1 - Good
PM2.5: 50.8 μg/m3
PM10: 52.2 μg/m3
Carbon Monoxide: 202 μg/m3
Nitrogen Dioxide: 36.1 μg/m3
Sulphur Dioxide: 3.5 μg/m3
Ozone: 103 μg/m3

Astronomical

Sunrise: 5:57 AM
Sun Transit: 1:14 PM
Sunset: 8:33 PM
Daylight: 14 hrs 36 mins
Moonrise: 9:39 AM
Moon Transit: 4:16 PM
Moonset: 10:43 PM
Moon Phase: Waxing Crescent
Moon Illumination: 7.0%

Best Times for Fishing or Hunting

Major Periods

5:09 AM - 7:39 AM
3:46 PM - 6:16 PM

Minor Periods

10:13 PM - 11:43 PM
9:09 AM - 10:39 AM

Action Rating: 2 out of 5

Air Quality Alert issued July 17 at 9:45AM EDT by NWS Baltimore MD/Washington DC

Effective: Fri July 17, 2026, 9:45 AM
Expires: Sat July 18, 2026, 12:00 AM

The Virginia Department of Environmental Quality has issued a Code PURPLE Air Quality Alert Friday for Northern Virginia. A Code Purple Air Quality Alert means that air pollution concentrations within the region are very unhealthy for the general population. The risk of health effects is increased for everyone. 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 Virginia DEQ air quality web site at www.deq.virginia.gov


Air Quality Alert issued July 17 at 8:30AM EDT by NWS Baltimore MD/Washington DC

Effective: Fri July 17, 2026, 8:30 AM
Expires: Sat July 18, 2026, 12:00 AM

The Virginia Department of Environmental Quality has issued a Code RED Air Quality Alert Friday for Northern Virginia. A Code Red Air Quality Alert means that air pollution concentrations within the region are unhealthy for the general population. 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 Virginia DEQ air quality web site at www.deq.virginia.gov


Air Quality Alert issued July 16 at 5:10PM EDT by NWS Baltimore MD/Washington DC

Effective: Thu July 16, 2026, 5:10 PM
Expires: Sat July 18, 2026, 12:00 AM

The Virginia Department of Environmental Quality has issued a Code RED Air Quality Alert Friday for Northern Virginia. A Code Red Air Quality Alert means that air pollution concentrations within the region are unhealthy for the general population. 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 Virginia DEQ air quality web site at www.deq.virginia.gov


Air Quality Alert issued July 16 at 4:40PM EDT by NWS Baltimore MD/Washington DC

Effective: Thu July 16, 2026, 4:40 PM
Expires: Sat July 18, 2026, 12:00 AM

The Virginia Department of Environmental Quality has issued a Code RED Air Quality Alert Friday for Northern Virginia. A Code Red Air Quality Alert means that air pollution concentrations within the region are unhealthy for the general population. 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 Virginia DEQ air quality web site at www.deq.virginia.gov


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

Effective: Fri July 17, 2026, 4:40 PM
Expires: Sun July 19, 2026, 12:00 AM

The Virginia Department of Environmental Quality has issued a Code ORANGE Air Quality Alert Saturday for Northern Virginia. Concentrations of fine particulate matter due to wildfire smoke will persist at levels consistent with an Air Quality Index of Unhealthy (Red Alert) to Very Unhealthy (Purple Alert) Friday night into Saturday morning. Air quality begins to improve Saturday afternoon. Code Purple and Code Red Air Quality Alerts mean that air pollution concentrations within the region are unhealthy to very unhealthy for the general population. 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 Virginia DEQ air quality web site at www.deq.virginia.gov
Friday, July 17, 2026

Weather Forecast

Smoky haze
98.1°F
72.5°F
85.7°F
46%
0 in
1%
0%
6.9 mph
1.1


Air Quality

AQI: 2 - Moderate
PM2.5: 35.42 μg/m3
PM10: 36.55 μg/m3
Carbon Monoxide: 175.63 μg/m3
Nitrogen Dioxide: 13.3 μg/m3
Sulphur Dioxide: 2.46 μg/m3
Ozone: 113.33 μg/m3

Astronomical

Sunrise: 5:57 AM
Sun Transit: 1:14 PM
Sunset: 8:33 PM
Daylight: 14 hrs 36 mins
Moonrise: 9:39 AM
Moon Transit: 4:16 PM
Moonset: 10:43 PM
Moon Phase: Waxing Crescent
Moon Illumination: 7.0%

Best Times for Fishing or Hunting

Major Periods

5:09 AM - 7:39 AM
3:46 PM - 6:16 PM

Minor Periods

10:13 PM - 11:43 PM
9:09 AM - 10:39 AM

Action Rating: 2 out of 5

Saturday, July 18, 2026

Weather Forecast

Sunny
92°F
73.9°F
81.3°F
72%
0.44 in
72%
0%
7.4 mph
8.5


Air Quality

AQI: 2 - Moderate
PM2.5: 27.95 μg/m3
PM10: 29.43 μg/m3
Carbon Monoxide: 174.54 μg/m3
Nitrogen Dioxide: 11.02 μg/m3
Sulphur Dioxide: 2 μg/m3
Ozone: 98.5 μg/m3

Astronomical

Sunrise: 5:58 AM
Sun Transit: 1:15 PM
Sunset: 8:32 PM
Daylight: 14 hrs 34 mins
Moonrise: 10:48 AM
Moon Transit: 5:02 PM
Moonset: 11:06 PM
Moon Phase: Waxing Crescent
Moon Illumination: 13.9%

Best Times for Fishing or Hunting

Major Periods

5:55 AM - 8:25 AM
4:32 PM - 7:02 PM

Minor Periods

12:00 AM - 12:00 AM
10:18 AM - 11:48 AM

Action Rating: 3 out of 5

Sunday, July 19, 2026

Weather Forecast

Sunny
86.2°F
71.7°F
77.7°F
68%
0.07 in
57%
0%
9.4 mph
6.6


Air Quality

AQI: 1 - Good
PM2.5: 8.87 μg/m3
PM10: 8.96 μg/m3
Carbon Monoxide: 170.5 μg/m3
Nitrogen Dioxide: 8.13 μg/m3
Sulphur Dioxide: 1.35 μg/m3
Ozone: 88.42 μg/m3

Astronomical

Sunrise: 5:59 AM
Sun Transit: 1:15 PM
Sunset: 8:31 PM
Daylight: 14 hrs 33 mins
Moonrise: 11:53 AM
Moon Transit: 5:46 PM
Moonset: 12:06 AM
Moon Phase: Waxing Crescent
Moon Illumination: 22.6%

Best Times for Fishing or Hunting

Major Periods

6:40 AM - 9:10 AM
5:16 PM - 7:46 PM

Minor Periods

11:23 AM - 12:53 AM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Monday, July 20, 2026

Weather Forecast

Sunny
87.1°F
66.1°F
76.5°F
55%
0 in
4%
0%
10.1 mph
8.2


Air Quality

AQI: 1 - Good
PM2.5: 11.86 μg/m3
PM10: 11.92 μg/m3
Carbon Monoxide: 287.96 μg/m3
Nitrogen Dioxide: 15.37 μg/m3
Sulphur Dioxide: 2.05 μg/m3
Ozone: 79.17 μg/m3

Astronomical

Sunrise: 5:59 AM
Sun Transit: 1:15 PM
Sunset: 8:31 PM
Daylight: 14 hrs 31 mins
Moonrise: 12:57 AM
Moon Transit: 6:29 PM
Moonset: 12:29 AM
Moon Phase: Waxing Crescent
Moon Illumination: 32.7%

Best Times for Fishing or Hunting

Major Periods

7:23 AM - 9:53 AM
5:59 PM - 8:29 PM

Minor Periods

12:27 AM - 1:57 PM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

Tuesday, July 21, 2026

Weather Forecast

Patchy rain nearby
88.2°F
70.1°F
76.2°F
83%
0.37 in
82%
0%
10.5 mph
7.4


Air Quality

AQI: 1 - Good
PM2.5: 11.5 μg/m3
PM10: 12.43 μg/m3
Carbon Monoxide: 286 μg/m3
Nitrogen Dioxide: 13.97 μg/m3
Sulphur Dioxide: 1.72 μg/m3
Ozone: 61.56 μg/m3

Astronomical

Sunrise: 6:00 AM
Sun Transit: 1:15 PM
Sunset: 8:30 PM
Daylight: 14 hrs 30 mins
Moonrise: 2:01 PM
Moon Transit: 7:13 PM
Moonset: 12:53 AM
Moon Phase: First Quarter
Moon Illumination: 43.7%

Best Times for Fishing or Hunting

Major Periods

8:07 AM - 10:37 AM
6:43 PM - 9:13 PM

Minor Periods

1:31 PM - 3:01 PM
12:00 AM - 12:00 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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