Water Temperature of Difficult Run in McLean, VA

Current Water Temperature

66.4°F

Measurement Time: Wednesday, October 8, 2025, 11:15 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

68.5°F
Partly cloudy
Conditions: Partly cloudy
Humidity: 55%
Feels Like: 68.5°F
Wind: NNW 13 mph
Wind Gusts: 14.9 mph
Pressure: 30.13 in
Precipitation: 0 in
Cloud Cover: 75%
Visibility: 9 mi
UV Index: 1.8

Five Day Weather Forecast

Overcast
Wed
H: 71°F
L: 55°F
Sunny
Thu
H: 66°F
L: 46°F
Sunny
Fri
H: 62°F
L: 43°F
Patchy rain nearby
Sat
H: 70°F
L: 56°F
Moderate rain
Sun
H: 59°F
L: 51°F

Air Quality

AQI: 1 - Good
PM2.5: 4.55 μg/m3
PM10: 4.55 μg/m3
Carbon Monoxide: 181.85 μg/m3
Nitrogen Dioxide: 10.55 μg/m3
Sulphur Dioxide: 3.05 μg/m3
Ozone: 79 μg/m3

Astronomical

Sunrise: 7:12 AM
Sun Transit: 12:56 AM
Sunset: 6:41 PM
Daylight: 11 hrs 29 mins
Moonrise: 7:23 PM
Moon Transit: 1:48 AM
Moonset: 9:00 AM
Moon Phase: Full
Moon Illumination: 95.8%

Best Times for Fishing or Hunting

Major Periods

1:18 AM - 3:48 AM
3:32 PM - 6:02 PM

Minor Periods

6:53 PM - 8:23 PM
8:30 AM - 10:00 AM

Action Rating: 4 out of 5

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

Effective: Wed October 8, 2025, 2:24 PM
Expires: Wed October 8, 2025, 2:34 PM

Monitoring message only. Please disregard.

Monitoring message only. Please disregard.
Wednesday, October 8, 2025

Weather Forecast

Conditions: Overcast
Average Temperature: 66.9°F
Average Humidity: 73%
Chance of Rain: 0%
Wind: 13.4 mph
UV Index: 0.5

Air Quality

AQI: 1 - Good
PM2.5: 4.92 μg/m3
PM10: 5.16 μg/m3
Carbon Monoxide: 167.85 μg/m3
Nitrogen Dioxide: 9.64 μg/m3
Sulphur Dioxide: 3.15 μg/m3
Ozone: 65.68 μg/m3

Astronomical

Sunrise: 7:12 AM
Sun Transit: 12:56 AM
Sunset: 6:41 PM
Daylight: 11 hrs 29 mins
Moonrise: 7:23 PM
Moon Transit: 1:48 AM
Moonset: 9:00 AM
Moon Phase: Full
Moon Illumination: 95.8%

Best Times for Fishing or Hunting

Major Periods

1:18 AM - 3:48 AM
3:32 PM - 6:02 PM

Minor Periods

6:53 PM - 8:23 PM
8:30 AM - 10:00 AM

Action Rating: 4 out of 5

Thursday, October 9, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 54.9°F
Average Humidity: 57%
Chance of Rain: 0%
Wind: 10.3 mph
UV Index: 1

Air Quality

AQI: 1 - Good
PM2.5: 5.14 μg/m3
PM10: 5.16 μg/m3
Carbon Monoxide: 177.93 μg/m3
Nitrogen Dioxide: 9.98 μg/m3
Sulphur Dioxide: 3.66 μg/m3
Ozone: 64.84 μg/m3

Astronomical

Sunrise: 7:13 AM
Sun Transit: 12:56 AM
Sunset: 6:39 PM
Daylight: 11 hrs 26 mins
Moonrise: 8:02 PM
Moon Transit: 2:44 AM
Moonset: 10:20 AM
Moon Phase: Waning Gibbous
Moon Illumination: 90.1%

Best Times for Fishing or Hunting

Major Periods

2:14 AM - 4:44 AM
4:31 PM - 7:01 PM

Minor Periods

7:32 PM - 9:02 PM
9:50 AM - 11:20 AM

Action Rating: 3 out of 5

Friday, October 10, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 53°F
Average Humidity: 67%
Chance of Rain: 0%
Wind: 8.9 mph
UV Index: 1.1

Air Quality

AQI: 1 - Good
PM2.5: 10.71 μg/m3
PM10: 11.54 μg/m3
Carbon Monoxide: 243.69 μg/m3
Nitrogen Dioxide: 24.96 μg/m3
Sulphur Dioxide: 5.75 μg/m3
Ozone: 46.56 μg/m3

Astronomical

Sunrise: 7:14 AM
Sun Transit: 12:55 AM
Sunset: 6:38 PM
Daylight: 11 hrs 24 mins
Moonrise: 8:51 PM
Moon Transit: 3:45 AM
Moonset: 11:39 AM
Moon Phase: Waning Gibbous
Moon Illumination: 82.3%

Best Times for Fishing or Hunting

Major Periods

3:15 AM - 5:45 AM
5:33 PM - 8:03 PM

Minor Periods

8:21 PM - 9:51 PM
11:09 AM - 12:39 AM

Action Rating: 2 out of 5

Saturday, October 11, 2025

Weather Forecast

Conditions: Patchy rain nearby
Average Temperature: 60.3°F
Average Humidity: 78%
Chance of Rain: 86%
Wind: 9.2 mph
UV Index: 0.6

Air Quality

AQI: 1 - Good
PM2.5: 12 μg/m3
PM10: 14.41 μg/m3
Carbon Monoxide: 264.13 μg/m3
Nitrogen Dioxide: 24.14 μg/m3
Sulphur Dioxide: 5.65 μg/m3
Ozone: 47.4 μg/m3

Astronomical

Sunrise: 7:15 AM
Sun Transit: 12:55 AM
Sunset: 6:36 PM
Daylight: 11 hrs 21 mins
Moonrise: 9:49 PM
Moon Transit: 4:48 AM
Moonset: 12:52 AM
Moon Phase: Waning Gibbous
Moon Illumination: 72.9%

Best Times for Fishing or Hunting

Major Periods

4:18 AM - 6:48 AM
6:37 PM - 9:07 PM

Minor Periods

9:19 PM - 10:49 PM
12:22 AM - 1:52 PM

Action Rating: 4 out of 5

Sunday, October 12, 2025

Weather Forecast

Conditions: Moderate rain
Average Temperature: 56.6°F
Average Humidity: 92%
Chance of Rain: 87%
Wind: 13.4 mph
UV Index: 0

Air Quality

AQI: 1 - Good
PM2.5: 5.89 μg/m3
PM10: 7.25 μg/m3
Carbon Monoxide: 215.39 μg/m3
Nitrogen Dioxide: 11.73 μg/m3
Sulphur Dioxide: 4.9 μg/m3
Ozone: 61.15 μg/m3

Astronomical

Sunrise: 7:16 AM
Sun Transit: 12:55 AM
Sunset: 6:35 PM
Daylight: 11 hrs 19 mins
Moonrise: 10:55 PM
Moon Transit: 5:52 AM
Moonset: 1:55 PM
Moon Phase: Waning Gibbous
Moon Illumination: 62.3%

Best Times for Fishing or Hunting

Major Periods

5:22 AM - 7:52 AM
7:40 PM - 10:10 PM

Minor Periods

10:25 PM - 11:55 PM
1:25 PM - 2:55 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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