Water Temperature of Difficult Run in McLean, VA

Current Water Temperature

36.1°F

Measurement Time: Wednesday, January 7, 2026, 12:15 AM EST

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

39.9°F

Conditions: Clear

Feels Like: 35.5°F

Heat Index: 39.1°F

Humidity: 97%

Wind: WSW 6.3 mph

Wind Gusts: 13.2 mph

Wind Chill: 35.8°F

Dew Point: 35.3°F

Precipitation: 0 in

Cloud Cover: 0%

Visibility: 8 mi

Air Pressure: 1005 mbar

UV Index: 0

Five Day Weather Forecast

Wed
H: 62°F
L: 37°F

Thu
H: 47°F
L: 29°F

Fri
H: 50°F
L: 36°F

Sat
H: 60°F
L: 57°F

Sun
H: 60°F
L: 38°F

Air Quality

AQI: 1 - Good

PM2.5: 13.15 μg/m3

PM10: 13.15 μg/m3

Carbon Monoxide: 282.85 μg/m3
Nitrogen Dioxide: 20.35 μg/m3
Sulphur Dioxide: 8.35 μg/m3
Ozone: 29 μg/m3

Astronomical

Sunrise: 7:28 AM
Sun Transit: 12:15 AM
Sunset: 5:03 PM
Daylight: 9 hrs 35 mins

Moonrise: 10:05 PM
Moon Transit: 3:43 AM
Moonset: 10:16 AM
Moon Phase: Waning Gibbous
Moon Illumination: 78.6%

Best Times for Fishing or Hunting

Major Periods

3:13 AM - 5:43 AM
5:20 PM - 7:50 PM

Minor Periods

9:35 PM - 11:05 PM
9:46 AM - 11:16 AM

Action Rating: 3 out of 5

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

Effective: Wed January 7, 2026, 1:27 AM
Expires: Wed January 7, 2026, 1:37 AM

Monitoring message only. Please disregard.

Wednesday, January 7, 2026

Weather Forecast

Conditions: Sunny

High Temperature: 62.1°F

Low Temperature: 36.7°F

Average Temperature: 46.8°F

Average Humidity: 73%

Precipitation: 0 in

Chance of Rain: 0%

Chance of Snow: 0%

Maximum Wind: 8.7 mph

UV Index: 0.2

Air Quality

AQI: 1 - Good

PM2.5: 9.89 μg/m3

PM10: 9.91 μg/m3

Carbon Monoxide: 246.05 μg/m3
Nitrogen Dioxide: 18.96 μg/m3
Sulphur Dioxide: 6.95 μg/m3
Ozone: 41.32 μg/m3

Astronomical

Sunrise: 7:28 AM
Sun Transit: 12:15 AM
Sunset: 5:03 PM
Daylight: 9 hrs 35 mins

Moonrise: 10:05 PM
Moon Transit: 3:43 AM
Moonset: 10:16 AM
Moon Phase: Waning Gibbous
Moon Illumination: 78.6%

Best Times for Fishing or Hunting

Major Periods

3:13 AM - 5:43 AM
5:20 PM - 7:50 PM

Minor Periods

9:35 PM - 11:05 PM
9:46 AM - 11:16 AM

Action Rating: 3 out of 5

Thursday, January 8, 2026

Weather Forecast

Conditions: Mist

High Temperature: 46.8°F

Low Temperature: 28.6°F

Average Temperature: 37.9°F

Average Humidity: 87%

Precipitation: 0 in

Chance of Rain: 0%

Chance of Snow: 0%

Maximum Wind: 7.2 mph

UV Index: 0.4

Air Quality

AQI: 2 - Moderate

PM2.5: 16.91 μg/m3

PM10: 16.99 μg/m3

Carbon Monoxide: 327.61 μg/m3
Nitrogen Dioxide: 23.86 μg/m3
Sulphur Dioxide: 13.01 μg/m3
Ozone: 26.68 μg/m3

Astronomical

Sunrise: 7:28 AM
Sun Transit: 12:15 AM
Sunset: 5:04 PM
Daylight: 9 hrs 36 mins

Moonrise: 11:08 PM
Moon Transit: 4:27 AM
Moonset: 10:39 AM
Moon Phase: Waning Gibbous
Moon Illumination: 68.7%

Best Times for Fishing or Hunting

Major Periods

3:57 AM - 6:27 AM
6:03 PM - 8:33 PM

Minor Periods

12:00 AM - 12:00 AM
10:09 AM - 11:39 AM

Action Rating: 2 out of 5

Friday, January 9, 2026

Weather Forecast

Conditions: Overcast

High Temperature: 49.8°F

Low Temperature: 36.1°F

Average Temperature: 43.9°F

Average Humidity: 88%

Precipitation: 0 in

Chance of Rain: 0%

Chance of Snow: 0%

Maximum Wind: 13.4 mph

UV Index: 0.3

Air Quality

AQI: 2 - Moderate

PM2.5: 16.3 μg/m3

PM10: 16.52 μg/m3

Carbon Monoxide: 274.21 μg/m3
Nitrogen Dioxide: 27.41 μg/m3
Sulphur Dioxide: 10.83 μg/m3
Ozone: 31.08 μg/m3

Astronomical

Sunrise: 7:28 AM
Sun Transit: 12:16 AM
Sunset: 5:05 PM
Daylight: 9 hrs 37 mins

Moonrise: 12:08 AM
Moon Transit: 5:08 AM
Moonset: 11:00 AM
Moon Phase: Waning Gibbous
Moon Illumination: 57.8%

Best Times for Fishing or Hunting

Major Periods

4:38 AM - 7:08 AM
6:44 PM - 9:14 PM

Minor Periods

10:30 AM - 12:00 AM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

Saturday, January 10, 2026

Weather Forecast

Conditions: Moderate rain

High Temperature: 59.5°F

Low Temperature: 56.9°F

Average Temperature: 59°F

Average Humidity: 96%

Precipitation: 0.43 in

Chance of Rain: 81%

Chance of Snow: 0%

Maximum Wind: 13.2 mph

UV Index: 0.1

Air Quality

AQI: 2 - Moderate

PM2.5: 16.76 μg/m3

PM10: 16.9 μg/m3

Carbon Monoxide: 363.84 μg/m3
Nitrogen Dioxide: 29.02 μg/m3
Sulphur Dioxide: 6.46 μg/m3
Ozone: 31.28 μg/m3

Astronomical

Sunrise: 7:27 AM
Sun Transit: 12:16 AM
Sunset: 5:06 PM
Daylight: 9 hrs 38 mins

Moonrise: 12:10 AM
Moon Transit: 5:50 AM
Moonset: 11:22 AM
Moon Phase: Last Quarter
Moon Illumination: 46.5%

Best Times for Fishing or Hunting

Major Periods

5:20 AM - 7:50 AM
7:25 PM - 9:55 PM

Minor Periods

10:52 AM - 12:22 AM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

Sunday, January 11, 2026

Weather Forecast

Conditions: Moderate rain

High Temperature: 60.4°F

Low Temperature: 38.1°F

Average Temperature: 53.7°F

Average Humidity: 69%

Precipitation: 0.2 in

Chance of Rain: 85%

Chance of Snow: 0%

Maximum Wind: 15.4 mph

UV Index: 0

Air Quality

AQI: 1 - Good

PM2.5: 6.76 μg/m3

PM10: 6.86 μg/m3

Carbon Monoxide: 173.59 μg/m3
Nitrogen Dioxide: 9.69 μg/m3
Sulphur Dioxide: 6.99 μg/m3
Ozone: 63.08 μg/m3

Astronomical

Sunrise: 7:27 AM
Sun Transit: 12:17 AM
Sunset: 5:07 PM
Daylight: 9 hrs 40 mins

Moonrise: 1:10 AM
Moon Transit: 6:31 AM
Moonset: 11:45 AM
Moon Phase: Last Quarter
Moon Illumination: 35.3%

Best Times for Fishing or Hunting

Major Periods

6:01 AM - 8:31 AM
8:08 PM - 10:38 PM

Minor Periods

11:15 AM - 12:45 AM
12:40 AM - 2:10 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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Water Temperature of Difficult Run in McLean, VA

Current Water Temperature

Temperature Locations

Local Points of Interest

Nearby Water Temperatures

Weather for McLean, Virginia

Current Weather

Five Day Weather Forecast

Air Quality

Astronomical

Best Times for Fishing or Hunting

Major Periods

Minor Periods

Weather Forecast

Air Quality

Astronomical

Best Times for Fishing or Hunting

Major Periods

Minor Periods

Weather Forecast

Air Quality

Astronomical

Best Times for Fishing or Hunting

Major Periods

Minor Periods

Weather Forecast

Air Quality

Astronomical

Best Times for Fishing or Hunting

Major Periods

Minor Periods

Weather Forecast

Air Quality

Astronomical

Best Times for Fishing or Hunting

Major Periods

Minor Periods

Weather Forecast

Air Quality

Astronomical

Best Times for Fishing or Hunting

Major Periods

Minor Periods

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