Water Temperature of Difficult Run in McLean, VA

Current Water Temperature

53.2°F 11.8°C
Cold Thermal Gear Required
53.2°F
Frigid < 50°F
Cold 50°–60°
Cool 60°–70°
Comfortable 70°–80°
Warm 80°+

Cold shock risk with rapid dexterity loss (10–15 mins). Wetsuit or drysuit strongly advised for any immersion.

Measurement Time: Sunday, November 8, 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

57.5°F
Sunny
Conditions: Sunny
Humidity: 45%
Feels Like: 49.8°F
Wind: W 8.7 mph
Wind Gusts: 13.7 mph
Pressure: 30 in
Precipitation: 0 in
Cloud Cover: 0%
Visibility: 6 mi
UV Index: 2.9

Weather Forecast

Sunny
Sun
H: 61°F
L: 44°F
Sunny
Mon
H: 60°F
L: 46°F
Sunny
Tue
H: 67°F
L: 42°F

Air Quality

EPA Index 1 • Good

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

PM2.5
3.4 μg/m³
Good
PM10
3.4 μg/m³
Good
Ozone (O3)
68 μg/m³
Photochemical
NO2
2 μg/m³
Nitrogen Dioxide
SO2
0.9 μg/m³
Sulfur Dioxide
CO
139 μg/m³
Carbon Monoxide

Astronomical

Sun
10h 17m daylight
Sunrise 6:44 AM
Solar Noon 11:52 AM
Sunset 5:01 PM
Moon
New • 0%
Moonrise 6:11 AM
Transit 11:18 AM
Moonset 4:19 PM

Best Times for Fishing or Hunting

Major Periods

10:48 AM - 1:18 PM
11:12 PM - 1:42 AM

Minor Periods

5:41 AM - 7:11 AM
3:49 PM - 5:19 PM
Action Rating:
Peak Action 5/5

Small Craft Advisory issued November 8 at 8:07AM EST until November 9 at 6:00PM EST by NWS Baltimore MD/Washington DC

Effective: Sun November 8, 2026, 8:07 AM
Expires: Sun November 8, 2026, 6:00 PM

* WHAT...Northwest winds 10 to 20 kt with gusts up to 25 kt. * WHERE...Tidal Potomac River from Key Bridge to Cobb Island MD, Patapsco River including Baltimore Harbor, and Patuxent River to Broomes Island MD. * WHEN...From 6 AM to 6 PM EST Monday. * IMPACTS...Conditions will be hazardous to small craft.
Sunday, November 8, 2026

Weather Forecast

Conditions: Sunny
Average Temperature: 51.1°F
Average Humidity: 59%
Chance of Rain: 4%
Wind: 11 mph
UV Index: 2.9

Astronomical

Sun
10h 17m daylight
Sunrise 6:44 AM
Solar Noon 11:52 AM
Sunset 5:01 PM
Moon
New • 0%
Moonrise 6:11 AM
Transit 11:18 AM
Moonset 4:19 PM

Best Times for Fishing or Hunting

Major Periods

10:48 AM - 1:18 PM
11:12 PM - 1:42 AM

Minor Periods

5:41 AM - 7:11 AM
3:49 PM - 5:19 PM
Action Rating:
Peak Action 5/5
Monday, November 9, 2026

Weather Forecast

Conditions: Sunny
Average Temperature: 51.3°F
Average Humidity: 55%
Chance of Rain: 5%
Wind: 15 mph
UV Index: 2.7

Astronomical

Sun
10h 14m daylight
Sunrise 6:45 AM
Solar Noon 11:52 AM
Sunset 5:00 PM
Moon
New • 2%
Moonrise 7:15 AM
Transit 12:06 PM
Moonset 4:52 PM

Best Times for Fishing or Hunting

Major Periods

12:01 AM - 2:31 AM
11:36 AM - 2:06 PM

Minor Periods

6:45 AM - 8:15 AM
4:22 PM - 5:52 PM
Action Rating:
Very Good 4/5
Tuesday, November 10, 2026

Weather Forecast

Conditions: Sunny
Average Temperature: 53°F
Average Humidity: 59%
Chance of Rain: 5%
Wind: 8.3 mph
UV Index: 2.8

Astronomical

Sun
10h 12m daylight
Sunrise 6:47 AM
Solar Noon 11:52 AM
Sunset 4:59 PM
Moon
New • 0%
Moonrise 8:19 AM
Transit 12:56 PM
Moonset 5:30 PM

Best Times for Fishing or Hunting

Major Periods

12:01 AM - 2:31 AM
12:26 PM - 2:56 PM

Minor Periods

7:49 AM - 9:19 AM
5:00 PM - 6:30 PM
Action Rating:
Very Good 4/5
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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