Water Temperature of Dead Run in McLean, VA

Current Water Temperature

73.6°F

Measurement Time: Sunday, July 6, 2025, 1:00 PM EDT

Temperature Locations

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Local Points of Interest

Dead Run; Langley Oaks Park

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Dead Run

Station Name: DEAD RUN AT WHANN AVENUE NEAR MCLEAN, VA
Data Source: Water Data - usgc.gov

Elevation Above Sea Level: 226 feet / 69 meters

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

88°F
Partly cloudy
Conditions: Partly cloudy
Humidity: 63%
Feels Like: 92.3°F
Wind: WNW 2.9 mph
Wind Gusts: 4.6 mph
Pressure: 29.92 in
Precipitation: 0 in
Cloud Cover: 50%
Visibility: 9 mi
UV Index: 5.7

Five Day Weather Forecast

Overcast
Mon
H: 93°F
L: 77°F
Heavy rain
Tue
H: 99°F
L: 71°F
Moderate rain
Wed
H: 93°F
L: 74°F
Patchy rain nearby
Thu
H: 90°F
L: 76°F
Patchy rain nearby
Fri
H: 83°F
L: 70°F

Air Quality

PM2.5: 12.95 μg/m3
PM10: 13.32 μg/m3
Carbon Monoxide: 333 μg/m3
Nitrogen Dioxide: 24.42 μg/m3
Sulphur Dioxide: 4.26 μg/m3
Ozone: 125 μg/m3

Astronomical

Sunrise: 5:50 AM
Sun Transit: 1:13 PM
Sunset: 8:37 PM
Daylight: 14 hrs 47 mins
Moonrise: 6:24 PM
Moon Transit: 10:53 PM
Moonset: 2:39 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 91.7%

Best Times for Fishing or Hunting

Major Periods

11:44 AM - 2:14 PM
12:00 AM - 12:00 AM

Minor Periods

5:54 PM - 7:24 PM
2:09 AM - 3:39 AM

Action Rating: 2 out of 5

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

Effective: Mon July 7, 2025, 2:25 PM
Expires: Mon July 7, 2025, 2:35 PM

Monitoring message only. Please disregard.

Monitoring message only. Please disregard.


Heat Advisory issued July 7 at 12:31PM EDT until July 8 at 7:00PM EDT by NWS Baltimore MD/Washington DC

Effective: Mon July 7, 2025, 12:31 PM
Expires: Mon July 7, 2025, 8:45 PM

* WHAT...Heat index values up to 105 expected, up to 107 degrees closer to the Chesapeake Bay. * WHERE...In Maryland, Anne Arundel, Prince Georges, Cecil, Southeast Harford, Southern Baltimore, Calvert, Charles, and St. Marys Counties. In Virginia, King George County. * WHEN...From 1 PM to 7 PM EDT Tuesday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1.


Heat Advisory issued July 7 at 12:31PM EDT until July 8 at 7:00PM EDT by NWS Baltimore MD/Washington DC

Effective: Mon July 7, 2025, 12:31 PM
Expires: Mon July 7, 2025, 8:45 PM

* WHAT...Heat index values up to 105 expected, up to 107 degrees closer to the Chesapeake Bay. * WHERE...In Maryland, Anne Arundel, Prince Georges, Cecil, Southeast Harford, Southern Baltimore, Calvert, Charles, and St. Marys Counties. In Virginia, King George County. * WHEN...From 1 PM to 7 PM EDT Tuesday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1.


Heat Advisory issued July 7 at 12:31PM EDT until July 8 at 7:00PM EDT by NWS Baltimore MD/Washington DC

Effective: Mon July 7, 2025, 12:31 PM
Expires: Mon July 7, 2025, 8:45 PM

* WHAT...Heat index values up to 105 expected, up to 107 degrees closer to the Chesapeake Bay. * WHERE...In Maryland, Anne Arundel, Prince Georges, Cecil, Southeast Harford, Southern Baltimore, Calvert, Charles, and St. Marys Counties. In Virginia, King George County. * WHEN...From 1 PM to 7 PM EDT Tuesday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1.


Heat Advisory issued July 7 at 12:31PM EDT until July 8 at 7:00PM EDT by NWS Baltimore MD/Washington DC

Effective: Mon July 7, 2025, 12:31 PM
Expires: Mon July 7, 2025, 8:45 PM

* WHAT...Heat index values up to 105 expected, up to 107 degrees closer to the Chesapeake Bay. * WHERE...In Maryland, Anne Arundel, Prince Georges, Cecil, Southeast Harford, Southern Baltimore, Calvert, Charles, and St. Marys Counties. In Virginia, King George County. * WHEN...From 1 PM to 7 PM EDT Tuesday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1.


Monday, July 7, 2025

Weather Forecast

Conditions: Overcast
Average Temperature: 84.2°F
Average Humidity: 73%
Chance of Rain: 0%
Wind: 4.5 mph
UV Index: 1.7

Air Quality

AQI: 1 - Good
PM2.5: 11.2 μg/m3
PM10: 12.06 μg/m3
Carbon Monoxide: 296.59 μg/m3
Nitrogen Dioxide: 15.53 μg/m3
Sulphur Dioxide: 4.84 μg/m3
Ozone: 84.76 μg/m3

Astronomical

Sunrise: 5:50 AM
Sun Transit: 1:13 PM
Sunset: 8:37 PM
Daylight: 14 hrs 47 mins
Moonrise: 6:24 PM
Moon Transit: 10:53 PM
Moonset: 2:39 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 91.7%

Best Times for Fishing or Hunting

Major Periods

11:44 AM - 2:14 PM
12:00 AM - 12:00 AM

Minor Periods

5:54 PM - 7:24 PM
2:09 AM - 3:39 AM

Action Rating: 2 out of 5

Tuesday, July 8, 2025

Weather Forecast

Conditions: Heavy rain
Average Temperature: 84.8°F
Average Humidity: 76%
Chance of Rain: 88%
Wind: 17.7 mph
UV Index: 2.6

Air Quality

AQI: 2 - Moderate
PM2.5: 23.56 μg/m3
PM10: 24.04 μg/m3
Carbon Monoxide: 379.18 μg/m3
Nitrogen Dioxide: 17.42 μg/m3
Sulphur Dioxide: 8.94 μg/m3
Ozone: 115.28 μg/m3

Astronomical

Sunrise: 5:51 AM
Sun Transit: 1:13 PM
Sunset: 8:37 PM
Daylight: 14 hrs 46 mins
Moonrise: 7:22 PM
Moon Transit: 11:47 PM
Moonset: 3:21 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 96.8%

Best Times for Fishing or Hunting

Major Periods

12:36 AM - 3:06 PM
12:00 AM - 12:00 AM

Minor Periods

6:52 PM - 8:22 PM
2:51 AM - 4:21 AM

Action Rating: 3 out of 5

Wednesday, July 9, 2025

Weather Forecast

Conditions: Moderate rain
Average Temperature: 81.3°F
Average Humidity: 79%
Chance of Rain: 89%
Wind: 8.5 mph
UV Index: 2.4

Air Quality

AQI: 2 - Moderate
PM2.5: 36.99 μg/m3
PM10: 37.73 μg/m3
Carbon Monoxide: 411.37 μg/m3
Nitrogen Dioxide: 29.65 μg/m3
Sulphur Dioxide: 10.74 μg/m3
Ozone: 117.92 μg/m3

Astronomical

Sunrise: 5:52 AM
Sun Transit: 1:14 PM
Sunset: 8:36 PM
Daylight: 14 hrs 45 mins
Moonrise: 8:15 PM
Moon Transit: 12:00 AM
Moonset: 4:12 AM
Moon Phase: Full
Moon Illumination: 99.6%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
1:31 PM - 4:01 PM

Minor Periods

7:45 PM - 9:15 PM
3:42 AM - 5:12 AM

Action Rating: 3 out of 5

Thursday, July 10, 2025

Weather Forecast

Conditions: Patchy rain nearby
Average Temperature: 81.4°F
Average Humidity: 77%
Chance of Rain: 83%
Wind: 4.3 mph
UV Index: 2.4

Air Quality

AQI: 3 - Unhealthy for Sensitive Groups
PM2.5: 48.17 μg/m3
PM10: 48.84 μg/m3
Carbon Monoxide: 684.36 μg/m3
Nitrogen Dioxide: 54.06 μg/m3
Sulphur Dioxide: 8.77 μg/m3
Ozone: 82.77 μg/m3

Astronomical

Sunrise: 5:52 AM
Sun Transit: 1:14 PM
Sunset: 8:36 PM
Daylight: 14 hrs 44 mins
Moonrise: 9:00 PM
Moon Transit: 12:41 AM
Moonset: 5:11 AM
Moon Phase: Full
Moon Illumination: 99.8%

Best Times for Fishing or Hunting

Major Periods

12:11 AM - 2:41 AM
2:25 PM - 4:55 PM

Minor Periods

8:30 PM - 10:00 PM
4:41 AM - 6:11 AM

Action Rating: 5 out of 5

Friday, July 11, 2025

Weather Forecast

Conditions: Patchy rain nearby
Average Temperature: 76.4°F
Average Humidity: 84%
Chance of Rain: 88%
Wind: 7.4 mph
UV Index: 0.1

Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 5:53 AM
Sun Transit: 1:14 PM
Sunset: 8:36 PM
Daylight: 14 hrs 43 mins
Moonrise: 9:38 PM
Moon Transit: 1:36 AM
Moonset: 6:17 AM
Moon Phase: Full
Moon Illumination: 97.4%

Best Times for Fishing or Hunting

Major Periods

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

Minor Periods

9:08 PM - 10:38 PM
5:47 AM - 7:17 AM

Action Rating: 4 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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