Water Temperature of Difficult Run in McLean, VA

Current Water Temperature

59.0°F

Measurement Time: Thursday, November 5, 2026, 6:15 AM EST

Temperature Locations

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Local Points of Interest

Great Falls Park; Great Falls, VA

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Difficult Run

Station Name: DIFFICULT RUN NEAR GREAT FALLS, VA
Data Source: Water Data - usgc.gov

Elevation Above Sea Level: 184 feet

Nearest Address:
9200 Old Dominion Dr
McLean, VA 22102
Fairfax County

GPS Coordinates: 38.97594346, -77.24581439

Nearby Water Temperatures

Dead Run, McLean, VA (3.9 mi)
Difficult Run, Oakton, VA (7.8 mi)
Sligo Creek, Takoma Park, MD (13 mi)
Washington Channel, Washington, DC (14 mi)
Paint Branch, Calverton, MD (15.6 mi)
Northeast Branch Anacostia River, Riverdale Park, MD (17.2 mi)
Patuxent River, Brighton, MD (19.8 mi)
Potomac River, Point of Rocks, MD (26 mi)
Carroll Creek, Frederick, MD (32.5 mi)
Carroll Creek, Frederick, MD (33.5 mi)
Scotts Level Branch, Milford Mill, MD (37.2 mi)
Northwest Harbor, Baltimore, MD (41 mi)
Spout Run, Boyce, VA (41.2 mi)
Severn River, Annapolis, MD (41.2 mi)
Chesapeake Bay, Annapolis, MD (42.9 mi)

Weather for McLean, Virginia

Current Weather

74.9°F
Cloudy
Conditions: Cloudy
Humidity: 66%
Feels Like: 73.2°F
Wind: SSW 10.7 mph
Wind Gusts: 17.2 mph
Pressure: 29.88 in
Precipitation: 0 in
Cloud Cover: 63%
Visibility: 6 mi
UV Index: 0.8

Weather Forecast

Patchy rain nearby
Thu
H: 75°F
L: 64°F
Overcast
Fri
H: 69°F
L: 60°F
Sunny
Sat
H: 59°F
L: 47°F

Air Quality

EPA Index 1 • Good

Air quality is satisfactory, and air pollution poses little or no risk.

PM2.5
5.2 μg/m³
Good
PM10
6.1 μg/m³
Good
Ozone (O3)
67 μg/m³
Photochemical
NO2
6.3 μg/m³
Nitrogen Dioxide
SO2
1.1 μg/m³
Sulfur Dioxide
CO
141 μg/m³
Carbon Monoxide

Astronomical

Sun
10h 23m daylight
Sunrise 6:41 AM
Solar Noon 11:52 AM
Sunset 5:04 PM
Moon
Waning Crescent • 11%
Moonrise 2:57 AM
Transit 9:04 AM
Moonset 3:01 PM

Best Times for Fishing or Hunting

Major Periods

8:34 AM - 11:04 AM
8:56 PM - 11:26 PM

Minor Periods

2:27 AM - 3:57 AM
2:31 PM - 4:01 PM
Action Rating:
Fair Action 2/5

Small Craft Advisory issued November 5 at 7:32AM EST until November 5 at 7:00PM EST by NWS Baltimore MD/Washington DC

Effective: Thu November 5, 2026, 7:32 AM
Expires: Thu November 5, 2026, 4:00 PM

* WHAT...South winds around 10 kt with gusts up to 20 kt. * WHERE...Tidal Potomac River from Key Bridge to Smith Point VA, and Chesapeake Bay and adjoining estuaries north of Drum Point MD. * WHEN...Until 7 PM EST this evening. * IMPACTS...Conditions will be hazardous to small craft.
Thursday, November 5, 2026

Weather Forecast

Conditions: Patchy rain nearby
Average Temperature: 68.1°F
Average Humidity: 84%
Chance of Rain: 82%
Wind: 11 mph
UV Index: 1.7

Astronomical

Sun
10h 23m daylight
Sunrise 6:41 AM
Solar Noon 11:52 AM
Sunset 5:04 PM
Moon
Waning Crescent • 11%
Moonrise 2:57 AM
Transit 9:04 AM
Moonset 3:01 PM

Best Times for Fishing or Hunting

Major Periods

8:34 AM - 11:04 AM
8:56 PM - 11:26 PM

Minor Periods

2:27 AM - 3:57 AM
2:31 PM - 4:01 PM
Action Rating:
Fair Action 2/5
Friday, November 6, 2026

Weather Forecast

Conditions: Overcast
Average Temperature: 63.7°F
Average Humidity: 74%
Chance of Rain: 63%
Wind: 10.5 mph
UV Index: 2.1

Astronomical

Sun
10h 21m daylight
Sunrise 6:42 AM
Solar Noon 11:52 AM
Sunset 5:03 PM
Moon
Waning Crescent • 5%
Moonrise 4:02 AM
Transit 9:47 AM
Moonset 3:25 PM

Best Times for Fishing or Hunting

Major Periods

9:17 AM - 11:47 AM
9:39 PM - 12:09 AM

Minor Periods

3:32 AM - 5:02 AM
2:55 PM - 4:25 PM
Action Rating:
Fair Action 2/5
Saturday, November 7, 2026

Weather Forecast

Conditions: Sunny
Average Temperature: 51.6°F
Average Humidity: 54%
Chance of Rain: 5%
Wind: 14.3 mph
UV Index: 2.8

Astronomical

Sun
10h 19m daylight
Sunrise 6:43 AM
Solar Noon 11:52 AM
Sunset 5:02 PM
Moon
Waning Crescent • 1%
Moonrise 5:06 AM
Transit 10:32 AM
Moonset 3:50 PM

Best Times for Fishing or Hunting

Major Periods

10:02 AM - 12:32 PM
10:25 PM - 12:55 AM

Minor Periods

4:36 AM - 6:06 AM
3:20 PM - 4:50 PM
Action Rating:
Good Action 3/5
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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