Water Temperature of Difficult Run in McLean, VA

Current Water Temperature

32.0°F

Measurement Time: Monday, July 28, 2025, 1:15 AM EDT

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 / 56 meters

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 (13.0 mi)
Washington Channel, Washington, DC (14.0 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 (26.0 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 (41.0 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

75.9°F
Fog
Conditions: Fog
Humidity: 85%
Feels Like: 81.3°F
Wind: NNW 4.5 mph
Wind Gusts: 9.2 mph
Pressure: 30.03 in
Precipitation: 0 in
Cloud Cover: 0%
Visibility: 9 mi
UV Index: 0

Five Day Weather Forecast

Sunny
Mon
H: 98°F
L: 74°F
Sunny
Tue
H: 99°F
L: 75°F
Sunny
Wed
H: 102°F
L: 78°F
Moderate rain
Thu
H: 81°F
L: 70°F
Patchy rain nearby
Fri
H: 76°F
L: 66°F

Air Quality

PM2.5: 15.91 μg/m3
PM10: 16.47 μg/m3
Carbon Monoxide: 442.15 μg/m3
Nitrogen Dioxide: 7.22 μg/m3
Sulphur Dioxide: 7.77 μg/m3
Ozone: 105 μg/m3

Astronomical

Sunrise: 6:07 AM
Sun Transit: 1:15 PM
Sunset: 8:24 PM
Daylight: 14 hrs 17 mins
Moonrise: 10:04 AM
Moon Transit: 4:23 PM
Moonset: 10:33 PM
Moon Phase: Waxing Crescent
Moon Illumination: 9.3%

Best Times for Fishing or Hunting

Major Periods

5:17 AM - 7:47 AM
3:53 PM - 6:23 PM

Minor Periods

10:03 PM - 11:33 PM
9:34 AM - 11:04 AM

Action Rating: 2 out of 5

This is only a test for monitoring of vital dissemination systems.

Effective: Mon July 28, 2025, 2:22 AM
Expires: Mon July 28, 2025, 2:32 AM

Monitoring message only. Please disregard.

Monitoring message only. Please disregard.
Monday, July 28, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 85.9°F
Average Humidity: 71%
Chance of Rain: 0%
Wind: 6 mph
UV Index: 2.6

Air Quality

AQI: 2 - Moderate
PM2.5: 23.61 μg/m3
PM10: 24.04 μg/m3
Carbon Monoxide: 420.84 μg/m3
Nitrogen Dioxide: 15.95 μg/m3
Sulphur Dioxide: 6.01 μg/m3
Ozone: 97.2 μg/m3

Astronomical

Sunrise: 6:07 AM
Sun Transit: 1:15 PM
Sunset: 8:24 PM
Daylight: 14 hrs 17 mins
Moonrise: 10:04 AM
Moon Transit: 4:23 PM
Moonset: 10:33 PM
Moon Phase: Waxing Crescent
Moon Illumination: 9.3%

Best Times for Fishing or Hunting

Major Periods

5:17 AM - 7:47 AM
3:53 PM - 6:23 PM

Minor Periods

10:03 PM - 11:33 PM
9:34 AM - 11:04 AM

Action Rating: 2 out of 5

Tuesday, July 29, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 87°F
Average Humidity: 69%
Chance of Rain: 0%
Wind: 6 mph
UV Index: 2.5

Air Quality

AQI: 3 - Unhealthy for Sensitive Groups
PM2.5: 41.85 μg/m3
PM10: 42.91 μg/m3
Carbon Monoxide: 457.1 μg/m3
Nitrogen Dioxide: 49.77 μg/m3
Sulphur Dioxide: 9.01 μg/m3
Ozone: 95.44 μg/m3

Astronomical

Sunrise: 6:08 AM
Sun Transit: 1:15 PM
Sunset: 8:23 PM
Daylight: 14 hrs 16 mins
Moonrise: 11:05 AM
Moon Transit: 5:03 PM
Moonset: 10:53 PM
Moon Phase: Waxing Crescent
Moon Illumination: 16.9%

Best Times for Fishing or Hunting

Major Periods

5:58 AM - 8:28 AM
4:33 PM - 7:03 PM

Minor Periods

10:23 PM - 11:53 PM
10:35 AM - 12:05 AM

Action Rating: 3 out of 5

Wednesday, July 30, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 89.9°F
Average Humidity: 65%
Chance of Rain: 0%
Wind: 6.7 mph
UV Index: 2.5

Air Quality

AQI: 2 - Moderate
PM2.5: 36.1 μg/m3
PM10: 36.8 μg/m3
Carbon Monoxide: 464.28 μg/m3
Nitrogen Dioxide: 29.02 μg/m3
Sulphur Dioxide: 11.57 μg/m3
Ozone: 100.16 μg/m3

Astronomical

Sunrise: 6:08 AM
Sun Transit: 1:15 PM
Sunset: 8:22 PM
Daylight: 14 hrs 14 mins
Moonrise: 12:05 AM
Moon Transit: 5:44 PM
Moonset: 11:14 PM
Moon Phase: Waxing Crescent
Moon Illumination: 26.2%

Best Times for Fishing or Hunting

Major Periods

6:38 AM - 9:08 AM
5:14 PM - 7:44 PM

Minor Periods

12:00 AM - 12:00 AM
11:35 AM - 1:05 PM

Action Rating: 3 out of 5

Thursday, July 31, 2025

Weather Forecast

Conditions: Moderate rain
Average Temperature: 75.5°F
Average Humidity: 88%
Chance of Rain: 89%
Wind: 10.5 mph
UV Index: 1.9

Air Quality

AQI: 2 - Moderate
PM2.5: 38.14 μg/m3
PM10: 38.78 μg/m3
Carbon Monoxide: 731.89 μg/m3
Nitrogen Dioxide: 49.38 μg/m3
Sulphur Dioxide: 9.45 μg/m3
Ozone: 66.69 μg/m3

Astronomical

Sunrise: 6:09 AM
Sun Transit: 1:15 PM
Sunset: 8:21 PM
Daylight: 14 hrs 12 mins
Moonrise: 1:06 PM
Moon Transit: 6:25 PM
Moonset: 12:14 AM
Moon Phase: First Quarter
Moon Illumination: 36.7%

Best Times for Fishing or Hunting

Major Periods

7:19 AM - 9:49 AM
5:55 PM - 8:25 PM

Minor Periods

12:36 AM - 2:06 PM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

Friday, August 1, 2025

Weather Forecast

Conditions: Patchy rain nearby
Average Temperature: 70.5°F
Average Humidity: 79%
Chance of Rain: 87%
Wind: 10.5 mph
UV Index: 0

Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 6:10 AM
Sun Transit: 1:15 PM
Sunset: 8:20 PM
Daylight: 14 hrs 10 mins
Moonrise: 2:07 PM
Moon Transit: 7:09 PM
Moonset: 12:37 AM
Moon Phase: First Quarter
Moon Illumination: 47.9%

Best Times for Fishing or Hunting

Major Periods

8:02 AM - 10:32 AM
6:39 PM - 9:09 PM

Minor Periods

1:37 PM - 3:07 PM
12:00 AM - 12:00 AM

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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