Water Temperature of Difficult Run in McLean, VA

Current Water Temperature

52.7°F 11.5°C
Cold Thermal Gear Required
52.7°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: Wednesday, November 11, 2026, 8:15 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

67.3°F
Sunny
Conditions: Sunny
Humidity: 44%
Feels Like: 63.1°F
Wind: S 6.7 mph
Wind Gusts: 9.8 mph
Pressure: 29.88 in
Precipitation: 0 in
Cloud Cover: 11%
Visibility: 29.8 mi
UV Index: 2.9

Five-Day Weather Forecast

Overcast
Wed
H: 68°F
L: 41°F
Light Drizzle
Thu
H: 59°F
L: 46°F
Overcast
Fri
H: 51°F
L: 40°F
Overcast
Sat
H: 50°F
L: 37°F
Overcast
Sun
H: 51°F
L: 38°F

Air Quality

EPA Index 2 • Moderate

Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution.

PM2.5
7.3 μg/m³
Good
PM10
7.7 μg/m³
Good
Ozone (O3)
79 μg/m³
Photochemical
NO2
9.1 μg/m³
Nitrogen Dioxide
SO2
4.1 μg/m³
Sulfur Dioxide
CO
212 μg/m³
Carbon Monoxide

Astronomical

Sun
10h 11m daylight
Sunrise 6:48 AM
Solar Noon 11:53 AM
Sunset 4:58 PM
Moon
New • 2%
Moonrise 9:18 AM
Transit 1:47 PM
Moonset 6:16 PM

Best Times for Fishing or Hunting

Major Periods

12:52 AM - 3:22 AM
1:17 PM - 3:47 PM

Minor Periods

8:48 AM - 10:18 AM
5:46 PM - 7:16 PM
Action Rating:
Good Action 3/5
Wednesday, November 11, 2026

Weather Forecast

Conditions: Overcast
Average Temperature: 54°F
Average Humidity: 65%
Chance of Rain: 1%
Wind: 8.2 mph
UV Index: 3.6

Air Quality

EPA Index 2 • Moderate
PM2.5
13.8 μg/m³
Moderate
PM10
14.3 μg/m³
Good
Ozone (O3)
41.7 μg/m³
Photochemical
NO2
29.3 μg/m³
Nitrogen Dioxide
SO2
4.1 μg/m³
Sulfur Dioxide
CO
287.8 μg/m³
Carbon Monoxide

Astronomical

Sun
10h 11m daylight
Sunrise 6:48 AM
Solar Noon 11:53 AM
Sunset 4:58 PM
Moon
New • 2%
Moonrise 9:18 AM
Transit 1:47 PM
Moonset 6:16 PM

Best Times for Fishing or Hunting

Major Periods

12:52 AM - 3:22 AM
1:17 PM - 3:47 PM

Minor Periods

8:48 AM - 10:18 AM
5:46 PM - 7:16 PM
Action Rating:
Good Action 3/5
Thursday, November 12, 2026

Weather Forecast

Conditions: Light Drizzle
Average Temperature: 51.6°F
Average Humidity: 81%
Chance of Rain: 30%
Wind: 10.4 mph
UV Index: 2.4

Air Quality

EPA Index 2 • Moderate
PM2.5
9.2 μg/m³
Good
PM10
9.6 μg/m³
Good
Ozone (O3)
55.5 μg/m³
Photochemical
NO2
17.9 μg/m³
Nitrogen Dioxide
SO2
2.4 μg/m³
Sulfur Dioxide
CO
206.6 μg/m³
Carbon Monoxide

Astronomical

Sun
10h 9m daylight
Sunrise 6:49 AM
Solar Noon 11:53 AM
Sunset 4:57 PM
Moon
Waxing Crescent • 6%
Moonrise 10:12 AM
Transit 2:39 PM
Moonset 7:08 PM

Best Times for Fishing or Hunting

Major Periods

1:43 AM - 4:13 AM
2:09 PM - 4:39 PM

Minor Periods

9:42 AM - 11:12 AM
6:38 PM - 8:08 PM
Action Rating:
Good Action 3/5
Friday, November 13, 2026

Weather Forecast

Conditions: Overcast
Average Temperature: 45.9°F
Average Humidity: 57%
Chance of Rain: 22%
Wind: 13.2 mph
UV Index: 2.7

Air Quality

EPA Index 1 • Good
PM2.5
2.3 μg/m³
Good
PM10
2.4 μg/m³
Good
Ozone (O3)
47.1 μg/m³
Photochemical
NO2
10.3 μg/m³
Nitrogen Dioxide
SO2
1.6 μg/m³
Sulfur Dioxide
CO
145.6 μg/m³
Carbon Monoxide

Astronomical

Sun
10h 7m daylight
Sunrise 6:50 AM
Solar Noon 11:53 AM
Sunset 4:57 PM
Moon
Waxing Crescent • 13%
Moonrise 10:58 AM
Transit 3:30 PM
Moonset 8:06 PM

Best Times for Fishing or Hunting

Major Periods

2:34 AM - 5:04 AM
3:00 PM - 5:30 PM

Minor Periods

10:28 AM - 11:58 AM
7:36 PM - 9:06 PM
Action Rating:
Fair Action 2/5
Saturday, November 14, 2026

Weather Forecast

Conditions: Overcast
Average Temperature: 42.3°F
Average Humidity: 53%
Chance of Rain: 3%
Wind: 13.8 mph
UV Index: 3.4

Air Quality

EPA Index 1 • Good
PM2.5
2.9 μg/m³
Good
PM10
2.9 μg/m³
Good
Ozone (O3)
50.3 μg/m³
Photochemical
NO2
10.2 μg/m³
Nitrogen Dioxide
SO2
1.5 μg/m³
Sulfur Dioxide
CO
137.8 μg/m³
Carbon Monoxide

Astronomical

Sun
10h 5m daylight
Sunrise 6:51 AM
Solar Noon 11:53 AM
Sunset 4:56 PM
Moon
Waxing Crescent • 21%
Moonrise 11:37 AM
Transit 4:18 PM
Moonset 9:06 PM

Best Times for Fishing or Hunting

Major Periods

3:24 AM - 5:54 AM
3:48 PM - 6:18 PM

Minor Periods

11:07 AM - 12:37 PM
8:36 PM - 10:06 PM
Action Rating:
Fair Action 2/5
Sunday, November 15, 2026

Weather Forecast

Conditions: Overcast
Average Temperature: 43.5°F
Average Humidity: 55%
Chance of Rain: 0%
Wind: 11.3 mph
UV Index: 3.3

Air Quality

EPA Index 1 • Good
PM2.5
3 μg/m³
Good
PM10
3 μg/m³
Good
Ozone (O3)
50.5 μg/m³
Photochemical
NO2
9.3 μg/m³
Nitrogen Dioxide
SO2
1.4 μg/m³
Sulfur Dioxide
CO
139.1 μg/m³
Carbon Monoxide

Astronomical

Sun
10h 3m daylight
Sunrise 6:52 AM
Solar Noon 11:53 AM
Sunset 4:55 PM
Moon
Waxing Crescent • 31%
Moonrise 12:10 PM
Transit 5:05 PM
Moonset 10:07 PM

Best Times for Fishing or Hunting

Major Periods

4:12 AM - 6:42 AM
4:35 PM - 7:05 PM

Minor Periods

11:40 AM - 1:10 PM
9:37 PM - 11:07 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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