Water Temperature of Difficult Run in McLean, VA

Current Water Temperature

62.6°F

Measurement Time: Monday, October 12, 2026, 2:15 AM EDT

Temperature Locations

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Local Points of Interest

Great Falls Park; Great Falls, VA

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

59.8°F

Conditions: Overcast
Humidity: 96%
Feels Like: 58.1°F
Wind: NW 8.1 mph
Wind Gusts: 22.7 mph

Pressure: 29.83 in
Precipitation: 0 in
Cloud Cover: 100%
Visibility: 6 mi
UV Index: 0

Weather Forecast

Mon
H: 74°F
L: 60°F

Tue
H: 81°F
L: 58°F

Wed
H: 87°F
L: 65°F

Thu
H: 70°F
L: 60°F

Fri
H: 78°F
L: 53°F

Air Quality

AQI: 1 - Good

PM2.5: 0.8 μg/m3

PM10: 0.8 μg/m3

Carbon Monoxide: 142 μg/m3
Nitrogen Dioxide: 4.9 μg/m3
Sulphur Dioxide: 1.3 μg/m3
Ozone: 50 μg/m3

Astronomical

Sunrise: 7:15 AM
Sun Transit: 12:55 AM
Sunset: 6:35 PM
Daylight: 11 hrs 20 mins

Moonrise: 9:24 AM
Moon Transit: 2:24 PM
Moonset: 7:18 PM
Moon Phase: New
Moon Illumination: 0.8%

Best Times for Fishing or Hunting

Major Periods

3:16 AM - 5:46 AM
1:54 PM - 4:24 PM

Minor Periods

6:48 PM - 8:18 PM
8:54 AM - 10:24 AM

Action Rating: 4 out of 5

Monday, October 12, 2026

Weather Forecast

Conditions: Overcast
Average Temperature: 64.3°F
Average Humidity: 87%

Chance of Rain: 84%
Wind: 10.5 mph
UV Index: 4.1

Air Quality

AQI: 1 - Good

PM2.5: 2.27 μg/m3

PM10: 2.3 μg/m3

Carbon Monoxide: 149.63 μg/m3
Nitrogen Dioxide: 7.3 μg/m3
Sulphur Dioxide: 1.05 μg/m3
Ozone: 51 μg/m3

Astronomical

Sunrise: 7:15 AM
Sun Transit: 12:55 AM
Sunset: 6:35 PM
Daylight: 11 hrs 20 mins

Moonrise: 9:24 AM
Moon Transit: 2:24 PM
Moonset: 7:18 PM
Moon Phase: New
Moon Illumination: 0.8%

Best Times for Fishing or Hunting

Major Periods

3:16 AM - 5:46 AM
1:54 PM - 4:24 PM

Minor Periods

6:48 PM - 8:18 PM
8:54 AM - 10:24 AM

Action Rating: 4 out of 5

Tuesday, October 13, 2026

Weather Forecast

Conditions: Sunny
Average Temperature: 68.1°F
Average Humidity: 71%

Chance of Rain: 6%
Wind: 9.4 mph
UV Index: 5

Air Quality

AQI: 1 - Good

PM2.5: 8.94 μg/m3

PM10: 9.04 μg/m3

Carbon Monoxide: 194.13 μg/m3
Nitrogen Dioxide: 12.04 μg/m3
Sulphur Dioxide: 2.26 μg/m3
Ozone: 63.04 μg/m3

Astronomical

Sunrise: 7:16 AM
Sun Transit: 12:55 AM
Sunset: 6:33 PM
Daylight: 11 hrs 17 mins

Moonrise: 10:29 AM
Moon Transit: 3:13 PM
Moonset: 7:53 PM
Moon Phase: New
Moon Illumination: 4.0%

Best Times for Fishing or Hunting

Major Periods

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

Minor Periods

7:23 PM - 8:53 PM
9:59 AM - 11:29 AM

Action Rating: 3 out of 5

Wednesday, October 14, 2026

Weather Forecast

Conditions: Sunny
Average Temperature: 74.3°F
Average Humidity: 67%

Chance of Rain: 36%
Wind: 8.3 mph
UV Index: 5.4

Air Quality

AQI: 1 - Good

PM2.5: 7.77 μg/m3

PM10: 8.35 μg/m3

Carbon Monoxide: 178.96 μg/m3
Nitrogen Dioxide: 8.63 μg/m3
Sulphur Dioxide: 2.24 μg/m3
Ozone: 71.71 μg/m3

Astronomical

Sunrise: 7:17 AM
Sun Transit: 12:54 AM
Sunset: 6:32 PM
Daylight: 11 hrs 15 mins

Moonrise: 11:30 AM
Moon Transit: 4:04 PM
Moonset: 8:35 PM
Moon Phase: Waxing Crescent
Moon Illumination: 9.6%

Best Times for Fishing or Hunting

Major Periods

4:54 AM - 7:24 AM
3:34 PM - 6:04 PM

Minor Periods

8:05 PM - 9:35 PM
11:00 AM - 12:30 AM

Action Rating: 4 out of 5

Thursday, October 15, 2026

Weather Forecast

Conditions: Overcast
Average Temperature: 64.7°F
Average Humidity: 82%

Chance of Rain: 60%
Wind: 7.8 mph
UV Index: 1.9

Air Quality

AQI: 1 - Good

PM2.5: 6.28 μg/m3

PM10: 6.32 μg/m3

Carbon Monoxide: 230.05 μg/m3
Nitrogen Dioxide: 15.9 μg/m3
Sulphur Dioxide: 1.8 μg/m3
Ozone: 46.04 μg/m3

Astronomical

Sunrise: 7:18 AM
Sun Transit: 12:54 AM
Sunset: 6:31 PM
Daylight: 11 hrs 12 mins

Moonrise: 12:28 AM
Moon Transit: 4:55 PM
Moonset: 9:22 PM
Moon Phase: Waxing Crescent
Moon Illumination: 17.2%

Best Times for Fishing or Hunting

Major Periods

5:45 AM - 8:15 AM
4:25 PM - 6:55 PM

Minor Periods

8:52 PM - 10:22 PM
11:58 AM - 1:28 PM

Action Rating: 3 out of 5

Friday, October 16, 2026

Weather Forecast

Conditions: Overcast
Average Temperature: 63.9°F
Average Humidity: 83%

Chance of Rain: 71%
Wind: 21.3 mph
UV Index: 6

Air Quality

AQI: 1 - Good

PM2.5: 13.26 μg/m3

PM10: 13.41 μg/m3

Carbon Monoxide: 304.78 μg/m3
Nitrogen Dioxide: 28.2 μg/m3
Sulphur Dioxide: 3.44 μg/m3
Ozone: 27.67 μg/m3

Astronomical

Sunrise: 7:19 AM
Sun Transit: 12:54 AM
Sunset: 6:29 PM
Daylight: 11 hrs 10 mins

Moonrise: 1:19 PM
Moon Transit: 5:46 PM
Moonset: 10:17 PM
Moon Phase: Waxing Crescent
Moon Illumination: 26.6%

Best Times for Fishing or Hunting

Major Periods

6:36 AM - 9:06 AM
5:16 PM - 7:46 PM

Minor Periods

9:47 PM - 11:17 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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