Water Temperature of Dead Run in McLean, VA

Current Water Temperature

54.5°F

Measurement Time: Thursday, October 23, 2025, 8:00 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 / 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

64°F
Sunny
Conditions: Sunny
Humidity: 29%
Feels Like: 64°F
Wind: W 12.1 mph
Wind Gusts: 13.9 mph
Pressure: 29.99 in
Precipitation: 0 in
Cloud Cover: 25%
Visibility: 9 mi
UV Index: 3

Five Day Weather Forecast

Sunny
Thu
H: 64°F
L: 48°F
Sunny
Fri
H: 59°F
L: 43°F
Sunny
Sat
H: 61°F
L: 43°F
Partly Cloudy
Sun
H: 59°F
L: 43°F
Patchy rain nearby
Mon
H: 51°F
L: 48°F

Air Quality

AQI: 2 - Moderate
PM2.5: 4.85 μg/m3
PM10: 4.95 μg/m3
Carbon Monoxide: 147.85 μg/m3
Nitrogen Dioxide: 4.15 μg/m3
Sulphur Dioxide: 4.95 μg/m3
Ozone: 81 μg/m3

Astronomical

Sunrise: 7:26 AM
Sun Transit: 12:52 AM
Sunset: 6:19 PM
Daylight: 10 hrs 52 mins
Moonrise: 9:37 AM
Moon Transit: 2:24 PM
Moonset: 7:08 PM
Moon Phase: New
Moon Illumination: 1.7%

Best Times for Fishing or Hunting

Major Periods

3:17 AM - 5:47 AM
1:54 PM - 4:24 PM

Minor Periods

6:38 PM - 8:08 PM
9:07 AM - 10:37 AM

Action Rating: 4 out of 5

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

Effective: Thu October 23, 2025, 8:24 AM
Expires: Thu October 23, 2025, 8:34 AM

Monitoring message only. Please disregard.

Monitoring message only. Please disregard.


Frost Advisory issued October 23 at 2:04AM EDT until October 24 at 9:00AM EDT by NWS Baltimore MD/Washington DC

Effective: Thu October 23, 2025, 2:04 AM
Expires: Thu October 23, 2025, 10:15 AM

* WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Portions of north central Maryland, central, northern, and northwest Virginia, and panhandle West Virginia. * WHEN...From 2 AM to 9 AM EDT Friday. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered.

Take steps now to protect tender plants from the cold.


Frost Advisory issued October 23 at 8:02AM EDT until October 24 at 9:00AM EDT by NWS Baltimore MD/Washington DC

Effective: Thu October 23, 2025, 8:02 AM
Expires: Thu October 23, 2025, 4:15 PM

* WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Portions of north central Maryland, central, northern, and northwest Virginia, and the eastern panhandle of West Virginia. * WHEN...From 2 AM to 9 AM EDT Friday. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered.

Take steps now to protect tender plants from the cold.


Special Weather Statement issued October 23 at 8:10AM EDT by NWS Baltimore MD/Washington DC

Effective: Thu October 23, 2025, 8:10 AM
Expires: Thu October 23, 2025, 7:00 PM

The combination of recent dry conditions, relative humidity falling to 15 to 30 percent, and sustained west winds 10 to 15 mph with gusts of 20 to 30 mph will likely result in an elevated threat for the rapid spread of fires today, particularly from late morning through late afternoon. Please refer to your local burn permitting authorities on whether you may burn outdoors. If you do burn, use extreme caution since fires can quickly grow out of control under these conditions.


Freeze Warning issued October 23 at 2:04AM EDT until October 24 at 9:00AM EDT by NWS Baltimore MD/Washington DC

Effective: Thu October 23, 2025, 2:04 AM
Expires: Thu October 23, 2025, 10:15 AM

* WHAT...Sub-freezing temperatures as low as 29 expected. * WHERE...Culpeper, Northern Fauquier, Southern Fauquier, Clarke, Frederick VA, Madison, Page, Rappahannock, and Warren Counties. * WHEN...From 2 AM to 9 AM EDT Friday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.

Take steps now to protect tender plants from the cold. To prevent water pipes from freezing, wrap or drain or allow them to drip slowly.


Freeze Warning issued October 23 at 8:02AM EDT until October 24 at 9:00AM EDT by NWS Baltimore MD/Washington DC

Effective: Thu October 23, 2025, 8:02 AM
Expires: Thu October 23, 2025, 4:15 PM

* WHAT...Sub-freezing temperatures as low as 29 expected. * WHERE...Culpeper, Northern Fauquier, Southern Fauquier, Clarke, Frederick VA, Madison, Page, Rappahannock, and Warren Counties. * WHEN...From 2 AM to 9 AM EDT Friday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.

Take steps now to protect tender plants from the cold. To prevent water pipes from freezing, wrap or drain or allow them to drip slowly.


Special Weather Statement issued October 23 at 3:26AM EDT by NWS Baltimore MD/Washington DC

Effective: Thu October 23, 2025, 3:26 AM
Expires: Thu October 23, 2025, 9:30 AM

The combination of recent dry conditions, relative humidity falling to 25 to 30 percent, and sustained west winds 10 to 15 mph with gusts of 20 to 25 mph will likely result in an elevated threat for the rapid spread of fires today, particularly from late morning through late afternoon. Please refer to your local burn permitting authorities on whether you may burn outdoors. If you do burn, use extreme caution since fires can quickly grow out of control under these conditions.


Thursday, October 23, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 55°F
Average Humidity: 47%
Chance of Rain: 0%
Wind: 12.5 mph
UV Index: 0.7

Air Quality

AQI: 1 - Good
PM2.5: 7.79 μg/m3
PM10: 7.84 μg/m3
Carbon Monoxide: 181.25 μg/m3
Nitrogen Dioxide: 17.67 μg/m3
Sulphur Dioxide: 6.16 μg/m3
Ozone: 49.16 μg/m3

Astronomical

Sunrise: 7:26 AM
Sun Transit: 12:52 AM
Sunset: 6:19 PM
Daylight: 10 hrs 52 mins
Moonrise: 9:37 AM
Moon Transit: 2:24 PM
Moonset: 7:08 PM
Moon Phase: New
Moon Illumination: 1.7%

Best Times for Fishing or Hunting

Major Periods

3:17 AM - 5:47 AM
1:54 PM - 4:24 PM

Minor Periods

6:38 PM - 8:08 PM
9:07 AM - 10:37 AM

Action Rating: 4 out of 5

Friday, October 24, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 50.3°F
Average Humidity: 63%
Chance of Rain: 0%
Wind: 10.7 mph
UV Index: 0.7

Air Quality

AQI: 1 - Good
PM2.5: 8.13 μg/m3
PM10: 8.15 μg/m3
Carbon Monoxide: 191.45 μg/m3
Nitrogen Dioxide: 20.79 μg/m3
Sulphur Dioxide: 6.57 μg/m3
Ozone: 39.72 μg/m3

Astronomical

Sunrise: 7:28 AM
Sun Transit: 12:52 AM
Sunset: 6:18 PM
Daylight: 10 hrs 50 mins
Moonrise: 10:39 AM
Moon Transit: 3:13 PM
Moonset: 7:45 PM
Moon Phase: Waxing Crescent
Moon Illumination: 5.8%

Best Times for Fishing or Hunting

Major Periods

4:04 AM - 6:34 AM
2:43 PM - 5:13 PM

Minor Periods

7:15 PM - 8:45 PM
10:09 AM - 11:39 AM

Action Rating: 2 out of 5

Saturday, October 25, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 51.2°F
Average Humidity: 62%
Chance of Rain: 0%
Wind: 6 mph
UV Index: 0.7

Air Quality

AQI: 1 - Good
PM2.5: 7.51 μg/m3
PM10: 7.52 μg/m3
Carbon Monoxide: 211.65 μg/m3
Nitrogen Dioxide: 23.44 μg/m3
Sulphur Dioxide: 6.81 μg/m3
Ozone: 35.48 μg/m3

Astronomical

Sunrise: 7:29 AM
Sun Transit: 12:52 AM
Sunset: 6:16 PM
Daylight: 10 hrs 48 mins
Moonrise: 11:37 AM
Moon Transit: 4:03 PM
Moonset: 8:29 PM
Moon Phase: Waxing Crescent
Moon Illumination: 12.2%

Best Times for Fishing or Hunting

Major Periods

4:54 AM - 7:24 AM
3:33 PM - 6:03 PM

Minor Periods

7:59 PM - 9:29 PM
11:07 AM - 12:37 AM

Action Rating: 4 out of 5

Sunday, October 26, 2025

Weather Forecast

Conditions: Partly Cloudy
Average Temperature: 50.9°F
Average Humidity: 60%
Chance of Rain: 0%
Wind: 3.8 mph
UV Index: 0.8

Air Quality

AQI: 2 - Moderate
PM2.5: 21.7 μg/m3
PM10: 21.74 μg/m3
Carbon Monoxide: 357.97 μg/m3
Nitrogen Dioxide: 43.71 μg/m3
Sulphur Dioxide: 8.34 μg/m3
Ozone: 24.32 μg/m3

Astronomical

Sunrise: 7:30 AM
Sun Transit: 12:52 AM
Sunset: 6:15 PM
Daylight: 10 hrs 45 mins
Moonrise: 12:32 AM
Moon Transit: 4:55 PM
Moonset: 9:21 PM
Moon Phase: Waxing Crescent
Moon Illumination: 20.5%

Best Times for Fishing or Hunting

Major Periods

5:46 AM - 8:16 AM
4:25 PM - 6:55 PM

Minor Periods

8:51 PM - 10:21 PM
12:02 AM - 1:32 PM

Action Rating: 2 out of 5

Monday, October 27, 2025

Weather Forecast

Conditions: Patchy rain nearby
Average Temperature: 49°F
Average Humidity: 82%
Chance of Rain: 88%
Wind: 7.6 mph
UV Index: 0

Air Quality

AQI: 2 - Moderate
PM2.5: 20.84 μg/m3
PM10: 20.92 μg/m3
Carbon Monoxide: 457 μg/m3
Nitrogen Dioxide: 48.09 μg/m3
Sulphur Dioxide: 6.99 μg/m3
Ozone: 16.62 μg/m3

Astronomical

Sunrise: 7:31 AM
Sun Transit: 12:52 AM
Sunset: 6:14 PM
Daylight: 10 hrs 43 mins
Moonrise: 1:19 PM
Moon Transit: 5:48 PM
Moonset: 10:20 PM
Moon Phase: Waxing Crescent
Moon Illumination: 30.3%

Best Times for Fishing or Hunting

Major Periods

6:38 AM - 9:08 AM
5:18 PM - 7:48 PM

Minor Periods

9:50 PM - 11:20 PM
12:49 AM - 2:19 PM

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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