Water Temperature of Difficult Run in McLean, VA

Current Water Temperature

49.6°F 9.8°C
Frigid Dangerously Cold
49.6°F
Frigid < 50°F
Cold 50°–60°
Cool 60°–70°
Comfortable 70°–80°
Warm 80°+

Severe hypothermia and cold water shock risk. Unprotected swimming causes rapid loss of dexterity in under 5 minutes.

Measurement Time: Saturday, November 14, 2026, 9:15 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

48.7°F
Overcast
Conditions: Overcast
Humidity: 51%
Feels Like: 39°F
Wind: WNW 13.6 mph
Wind Gusts: 25.7 mph
Pressure: 29.93 in
Precipitation: 0 in
Cloud Cover: 97%
Visibility: 23.9 mi
UV Index: 1.4

Five-Day Weather Forecast

Overcast
Sat
H: 50°F
L: 38°F
Overcast
Sun
H: 49°F
L: 35°F
Sunny
Mon
H: 54°F
L: 31°F
Sunny
Tue
H: 57°F
L: 40°F
Sunny
Wed
H: 60°F
L: 43°F

Air Quality

EPA Index 1 • Good

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

PM2.5
1.2 μg/m³
Good
PM10
1.2 μg/m³
Good
Ozone (O3)
61 μg/m³
Photochemical
NO2
4 μg/m³
Nitrogen Dioxide
SO2
1.1 μg/m³
Sulfur Dioxide
CO
125 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
Saturday, November 14, 2026

Weather Forecast

Conditions: Overcast
Average Temperature: 43.7°F
Average Humidity: 55%
Chance of Rain: 3%
Wind: 14 mph
UV Index: 2.7

Air Quality

EPA Index 1 • Good
PM2.5
3.6 μg/m³
Good
PM10
3.7 μg/m³
Good
Ozone (O3)
55.4 μg/m³
Photochemical
NO2
6.9 μg/m³
Nitrogen Dioxide
SO2
1.6 μg/m³
Sulfur Dioxide
CO
135.1 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: 42.1°F
Average Humidity: 61%
Chance of Rain: 2%
Wind: 10.9 mph
UV Index: 2.4

Air Quality

EPA Index 1 • Good
PM2.5
2.7 μg/m³
Good
PM10
2.7 μg/m³
Good
Ozone (O3)
51 μg/m³
Photochemical
NO2
10.5 μg/m³
Nitrogen Dioxide
SO2
1.7 μg/m³
Sulfur Dioxide
CO
134.5 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
Monday, November 16, 2026

Weather Forecast

Conditions: Sunny
Average Temperature: 43.2°F
Average Humidity: 59%
Chance of Rain: 1%
Wind: 9.6 mph
UV Index: 3.3

Air Quality

EPA Index 1 • Good
PM2.5
8 μg/m³
Good
PM10
8.2 μg/m³
Good
Ozone (O3)
41.6 μg/m³
Photochemical
NO2
21.3 μg/m³
Nitrogen Dioxide
SO2
2.6 μg/m³
Sulfur Dioxide
CO
161.6 μg/m³
Carbon Monoxide

Astronomical

Sun
10h 1m daylight
Sunrise 6:53 AM
Solar Noon 11:53 AM
Sunset 4:54 PM
Moon
First Quarter • 42%
Moonrise 12:38 PM
Transit 5:49 PM
Moonset 11:09 PM

Best Times for Fishing or Hunting

Major Periods

4:57 AM - 7:27 AM
5:19 PM - 7:49 PM

Minor Periods

12:08 PM - 1:38 PM
10:39 PM - 12:09 AM
Action Rating:
Good Action 3/5
Tuesday, November 17, 2026

Weather Forecast

Conditions: Sunny
Average Temperature: 47.7°F
Average Humidity: 57%
Chance of Rain: 0%
Wind: 4.6 mph
UV Index: 3.3

Air Quality

EPA Index 2 • Moderate
PM2.5
14.3 μg/m³
Moderate
PM10
14.6 μg/m³
Good
Ozone (O3)
31.4 μg/m³
Photochemical
NO2
31.3 μg/m³
Nitrogen Dioxide
SO2
3.6 μg/m³
Sulfur Dioxide
CO
227.2 μg/m³
Carbon Monoxide

Astronomical

Sun
9h 59m daylight
Sunrise 6:54 AM
Solar Noon 11:54 AM
Sunset 4:54 PM
Moon
First Quarter • 54%
Moonrise 1:03 PM
Transit 6:32 PM
Moonset 1:28 AM

Best Times for Fishing or Hunting

Major Periods

5:41 AM - 8:11 AM
6:02 PM - 8:32 PM

Minor Periods

12:58 AM - 2:28 AM
12:33 PM - 2:03 PM
Action Rating:
Fair Action 2/5
Wednesday, November 18, 2026

Weather Forecast

Conditions: Sunny
Average Temperature: 50.9°F
Average Humidity: 48%
Chance of Rain: 0%
Wind: 3.6 mph
UV Index: 3.4

Air Quality

EPA Index 2 • Moderate
PM2.5
21.7 μg/m³
Moderate
PM10
22.1 μg/m³
Good
Ozone (O3)
31.4 μg/m³
Photochemical
NO2
37.3 μg/m³
Nitrogen Dioxide
SO2
5 μg/m³
Sulfur Dioxide
CO
268.3 μg/m³
Carbon Monoxide

Astronomical

Sun
9h 58m daylight
Sunrise 6:55 AM
Solar Noon 11:54 AM
Sunset 4:53 PM
Moon
First Quarter • 65%
Moonrise 1:26 PM
Transit 7:15 PM
Moonset 12:11 AM

Best Times for Fishing or Hunting

Major Periods

6:23 AM - 8:53 AM
6:45 PM - 9:15 PM

Minor Periods

12:56 PM - 2:26 PM
11:41 PM - 1:11 AM
Action Rating:
Fair Action 2/5
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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