Water Temperature of Dead Run in McLean, VA

Current Water Temperature

80.2°F

Measurement Time: Thursday, July 2, 2026, 2:15 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

100°F
Sunny
Sunny
105.7°F
113.5°F
41%
NNW 4 mph
5.2 mph
104°F
69.1°F
0 in
25%
8 mi
1016 mbar
1.6

Five Day Weather Forecast

Sunny
Thu
H: 107°F
L: 78°F
Sunny
Fri
H: 104°F
L: 80°F
Sunny
Sat
H: 101°F
L: 71°F
Mist
Sun
H: 95°F
L: 69°F
Mist
Mon
H: 90°F
L: 68°F

Air Quality

AQI: 1 - Good
PM2.5: 15.5 μg/m3
PM10: 21.8 μg/m3
Carbon Monoxide: 136 μg/m3
Nitrogen Dioxide: 6.2 μg/m3
Sulphur Dioxide: 1.9 μg/m3
Ozone: 133 μg/m3

Astronomical

Sunrise: 5:47 AM
Sun Transit: 1:12 PM
Sunset: 8:38 PM
Daylight: 14 hrs 51 mins
Moonrise: 10:38 PM
Moon Transit: 3:02 AM
Moonset: 8:02 AM
Moon Phase: Waning Gibbous
Moon Illumination: 88.5%

Best Times for Fishing or Hunting

Major Periods

2:32 AM - 5:02 AM
4:41 PM - 7:11 PM

Minor Periods

10:08 PM - 11:38 PM
7:32 AM - 9:02 AM

Action Rating: 2 out of 5

Extreme Heat Warning issued July 2 at 8:36AM EDT until July 3 at 8:00PM EDT by NWS Baltimore MD/Washington DC

Effective: Thu July 2, 2026, 8:36 AM
Expires: Thu July 2, 2026, 5:00 PM

* WHAT...For the first Extreme Heat Warning, dangerously hot conditions with heat index values up to 111 expected. For the second Extreme Heat Warning, dangerously hot conditions with heat index values up to 112 expected. For the Extreme Heat Watch, dangerously hot conditions with heat index values up to 110 possible. * WHERE...Portions of DC, central, north central, northeast, northern, and southern Maryland, and central, northern, and northwest Virginia. * WHEN...For the first Extreme Heat Warning, until 8 PM EDT this evening. For the second Extreme Heat Warning, from 10 AM to 8 PM EDT Friday. For the Extreme Heat Watch, from Saturday morning through Saturday evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events.

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke.


Extreme Heat Watch issued July 2 at 8:36AM EDT until July 4 at 8:00PM EDT by NWS Baltimore MD/Washington DC

Effective: Thu July 2, 2026, 8:36 AM
Expires: Thu July 2, 2026, 5:00 PM

* WHAT...For the first Extreme Heat Warning, dangerously hot conditions with heat index values up to 111 expected. For the second Extreme Heat Warning, dangerously hot conditions with heat index values up to 112 expected. For the Extreme Heat Watch, dangerously hot conditions with heat index values up to 110 possible. * WHERE...Portions of DC, central, north central, northeast, northern, and southern Maryland, and central, northern, and northwest Virginia. * WHEN...For the first Extreme Heat Warning, until 8 PM EDT this evening. For the second Extreme Heat Warning, from 10 AM to 8 PM EDT Friday. For the Extreme Heat Watch, from Saturday morning through Saturday evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events.

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke.


Extreme Heat Warning issued July 2 at 8:36AM EDT until July 2 at 8:00PM EDT by NWS Baltimore MD/Washington DC

Effective: Thu July 2, 2026, 8:36 AM
Expires: Thu July 2, 2026, 5:00 PM

* WHAT...For the first Extreme Heat Warning, dangerously hot conditions with heat index values up to 111 expected. For the second Extreme Heat Warning, dangerously hot conditions with heat index values up to 112 expected. For the Extreme Heat Watch, dangerously hot conditions with heat index values up to 110 possible. * WHERE...Portions of DC, central, north central, northeast, northern, and southern Maryland, and central, northern, and northwest Virginia. * WHEN...For the first Extreme Heat Warning, until 8 PM EDT this evening. For the second Extreme Heat Warning, from 10 AM to 8 PM EDT Friday. For the Extreme Heat Watch, from Saturday morning through Saturday evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events.

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke.


Extreme Heat Warning issued July 2 at 1:32PM EDT until July 2 at 8:00PM EDT by NWS Baltimore MD/Washington DC

Effective: Thu July 2, 2026, 1:32 PM
Expires: Thu July 2, 2026, 11:00 PM

* WHAT...Dangerously hot conditions each afternoon with heat index values between 110 to 113 expected. * WHERE...Portions of DC, central, north central, northeast, northern, and southern Maryland, and central, northern, and northwest Virginia. * WHEN...For the first Extreme Heat Warning, until 8 PM EDT this evening. For the second Extreme Heat Warning, from 10 AM to 8 PM EDT Friday. For the third Extreme Heat Warning, from 10 AM to 8 PM EDT Saturday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events.

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke.


Extreme Heat Warning issued July 2 at 1:32PM EDT until July 3 at 8:00PM EDT by NWS Baltimore MD/Washington DC

Effective: Thu July 2, 2026, 1:32 PM
Expires: Thu July 2, 2026, 11:00 PM

* WHAT...Dangerously hot conditions each afternoon with heat index values between 110 to 113 expected. * WHERE...Portions of DC, central, north central, northeast, northern, and southern Maryland, and central, northern, and northwest Virginia. * WHEN...For the first Extreme Heat Warning, until 8 PM EDT this evening. For the second Extreme Heat Warning, from 10 AM to 8 PM EDT Friday. For the third Extreme Heat Warning, from 10 AM to 8 PM EDT Saturday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events.

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke.
Thursday, July 2, 2026

Weather Forecast

Sunny
107.1°F
78.3°F
92.2°F
57%
0 in
3%
0%
5.4 mph
9.6


Air Quality

AQI: 2 - Moderate
PM2.5: 18.03 μg/m3
PM10: 22.93 μg/m3
Carbon Monoxide: 156.25 μg/m3
Nitrogen Dioxide: 9.55 μg/m3
Sulphur Dioxide: 2.41 μg/m3
Ozone: 101.46 μg/m3

Astronomical

Sunrise: 5:47 AM
Sun Transit: 1:12 PM
Sunset: 8:38 PM
Daylight: 14 hrs 51 mins
Moonrise: 10:38 PM
Moon Transit: 3:02 AM
Moonset: 8:02 AM
Moon Phase: Waning Gibbous
Moon Illumination: 88.5%

Best Times for Fishing or Hunting

Major Periods

2:32 AM - 5:02 AM
4:41 PM - 7:11 PM

Minor Periods

10:08 PM - 11:38 PM
7:32 AM - 9:02 AM

Action Rating: 2 out of 5

Friday, July 3, 2026

Weather Forecast

Sunny
104°F
80.2°F
91.5°F
45%
0 in
3%
0%
7.2 mph
9.9


Air Quality

AQI: 1 - Good
PM2.5: 15.19 μg/m3
PM10: 18.43 μg/m3
Carbon Monoxide: 138.96 μg/m3
Nitrogen Dioxide: 8.83 μg/m3
Sulphur Dioxide: 2.37 μg/m3
Ozone: 102.38 μg/m3

Astronomical

Sunrise: 5:48 AM
Sun Transit: 1:13 PM
Sunset: 8:38 PM
Daylight: 14 hrs 50 mins
Moonrise: 11:03 PM
Moon Transit: 3:47 AM
Moonset: 9:05 AM
Moon Phase: Waning Gibbous
Moon Illumination: 80.3%

Best Times for Fishing or Hunting

Major Periods

3:17 AM - 5:47 AM
5:25 PM - 7:55 PM

Minor Periods

12:00 AM - 12:00 AM
8:35 AM - 10:05 AM

Action Rating: 3 out of 5

Saturday, July 4, 2026

Weather Forecast

Sunny
100.6°F
70.7°F
83.6°F
62%
0.78 in
66%
0%
12.8 mph
10


Air Quality

AQI: 1 - Good
PM2.5: 11.27 μg/m3
PM10: 12.21 μg/m3
Carbon Monoxide: 128.42 μg/m3
Nitrogen Dioxide: 6.53 μg/m3
Sulphur Dioxide: 2.26 μg/m3
Ozone: 109.71 μg/m3

Astronomical

Sunrise: 5:48 AM
Sun Transit: 1:13 PM
Sunset: 8:38 PM
Daylight: 14 hrs 50 mins
Moonrise: 12:03 AM
Moon Transit: 4:31 AM
Moonset: 10:08 AM
Moon Phase: Waning Gibbous
Moon Illumination: 70.6%

Best Times for Fishing or Hunting

Major Periods

4:01 AM - 6:31 AM
6:08 PM - 8:38 PM

Minor Periods

9:38 AM - 11:08 AM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

Sunday, July 5, 2026

Weather Forecast

Mist
95.1°F
69.3°F
77.9°F
79%
0.63 in
78%
0%
15 mph
9.2


Air Quality

AQI: 1 - Good
PM2.5: 14.98 μg/m3
PM10: 15.82 μg/m3
Carbon Monoxide: 154.19 μg/m3
Nitrogen Dioxide: 11.04 μg/m3
Sulphur Dioxide: 2.24 μg/m3
Ozone: 109.75 μg/m3

Astronomical

Sunrise: 5:49 AM
Sun Transit: 1:13 PM
Sunset: 8:38 PM
Daylight: 14 hrs 49 mins
Moonrise: 12:26 AM
Moon Transit: 5:14 AM
Moonset: 11:11 AM
Moon Phase: Waning Gibbous
Moon Illumination: 59.8%

Best Times for Fishing or Hunting

Major Periods

4:44 AM - 7:14 AM
12:00 AM - 12:00 AM

Minor Periods

10:41 AM - 12:11 AM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Monday, July 6, 2026

Weather Forecast

Mist
89.7°F
67.8°F
75.6°F
85%
3.04 in
87%
0%
14.3 mph
7.9


Air Quality

AQI: 1 - Good
PM2.5: 13.52 μg/m3
PM10: 14.02 μg/m3
Carbon Monoxide: 270.89 μg/m3
Nitrogen Dioxide: 11.18 μg/m3
Sulphur Dioxide: 1.81 μg/m3
Ozone: 73.44 μg/m3

Astronomical

Sunrise: 5:50 AM
Sun Transit: 1:13 PM
Sunset: 8:38 PM
Daylight: 14 hrs 48 mins
Moonrise: 12:49 AM
Moon Transit: 5:57 AM
Moonset: 12:16 AM
Moon Phase: Last Quarter
Moon Illumination: 48.6%

Best Times for Fishing or Hunting

Major Periods

5:27 AM - 7:57 AM
12:45 AM - 3:15 PM

Minor Periods

11:46 AM - 1:16 PM
12:00 AM - 12:00 AM

Action Rating: 3 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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