Water Temperature of Difficult Run in McLean, VA

Current Water Temperature

72.7°F

Measurement Time: Saturday, July 25, 2026, 2:15 AM EDT

Temperature Locations

View Nearby Locations     View All Virginia Locations     View Locations Near Me

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

64.9°F
Overcast
Overcast
64.9°F
69.8°F
93%
SSW 2.2 mph
2.6 mph
69.8°F
62.5°F
0 in
100%
9 mi
1020 mbar
0.2

Five Day Weather Forecast

Sunny
Sat
H: 85°F
L: 69°F
Partly Cloudy
Sun
H: 88°F
L: 64°F
Patchy rain nearby
Mon
H: 88°F
L: 64°F
Partly Cloudy
Tue
H: 88°F
L: 67°F
Patchy rain nearby
Wed
H: 90°F
L: 66°F

Air Quality

AQI: 1 - Good
PM2.5: 8.9 μg/m3
PM10: 11 μg/m3
Carbon Monoxide: 134 μg/m3
Nitrogen Dioxide: 12.6 μg/m3
Sulphur Dioxide: 1.9 μg/m3
Ozone: 66 μg/m3

Astronomical

Sunrise: 6:04 AM
Sun Transit: 1:15 PM
Sunset: 8:27 PM
Daylight: 14 hrs 23 mins
Moonrise: 6:02 PM
Moon Transit: 10:28 PM
Moonset: 2:06 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 85.2%

Best Times for Fishing or Hunting

Major Periods

11:18 AM - 1:48 PM
12:00 AM - 12:00 AM

Minor Periods

5:32 PM - 7:02 PM
1:36 AM - 3:06 AM

Action Rating: 2 out of 5

Saturday, July 25, 2026

Weather Forecast

Sunny
84.7°F
68.8°F
74.7°F
63%
0 in
6%
0%
5.4 mph
8.7


Air Quality

AQI: 1 - Good
PM2.5: 10.58 μg/m3
PM10: 13.56 μg/m3
Carbon Monoxide: 137.08 μg/m3
Nitrogen Dioxide: 7.75 μg/m3
Sulphur Dioxide: 1.36 μg/m3
Ozone: 96.13 μg/m3

Astronomical

Sunrise: 6:04 AM
Sun Transit: 1:15 PM
Sunset: 8:27 PM
Daylight: 14 hrs 23 mins
Moonrise: 6:02 PM
Moon Transit: 10:28 PM
Moonset: 2:06 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 85.2%

Best Times for Fishing or Hunting

Major Periods

11:18 AM - 1:48 PM
12:00 AM - 12:00 AM

Minor Periods

5:32 PM - 7:02 PM
1:36 AM - 3:06 AM

Action Rating: 2 out of 5

Sunday, July 26, 2026

Weather Forecast

Partly Cloudy
88°F
64.4°F
75.1°F
57%
0 in
7%
0%
6 mph
8.6


Air Quality

AQI: 1 - Good
PM2.5: 15.2 μg/m3
PM10: 18.68 μg/m3
Carbon Monoxide: 134.04 μg/m3
Nitrogen Dioxide: 7.87 μg/m3
Sulphur Dioxide: 1.73 μg/m3
Ozone: 96.54 μg/m3

Astronomical

Sunrise: 6:05 AM
Sun Transit: 1:15 PM
Sunset: 8:26 PM
Daylight: 14 hrs 21 mins
Moonrise: 6:52 PM
Moon Transit: 11:20 PM
Moonset: 2:55 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 92.3%

Best Times for Fishing or Hunting

Major Periods

12:10 AM - 2:40 PM
12:00 AM - 12:00 AM

Minor Periods

6:22 PM - 7:52 PM
2:25 AM - 3:55 AM

Action Rating: 2 out of 5

Monday, July 27, 2026

Weather Forecast

Patchy rain nearby
88.2°F
64.3°F
74.1°F
69%
0.28 in
68%
0%
9.8 mph
8.3


Air Quality

AQI: 2 - Moderate
PM2.5: 16.34 μg/m3
PM10: 17.2 μg/m3
Carbon Monoxide: 179.13 μg/m3
Nitrogen Dioxide: 8.67 μg/m3
Sulphur Dioxide: 2.08 μg/m3
Ozone: 93.54 μg/m3

Astronomical

Sunrise: 6:06 AM
Sun Transit: 1:15 PM
Sunset: 8:25 PM
Daylight: 14 hrs 20 mins
Moonrise: 7:35 PM
Moon Transit: 12:00 AM
Moonset: 3:50 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 97.2%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
1:01 PM - 3:31 PM

Minor Periods

7:05 PM - 8:35 PM
3:20 AM - 4:50 AM

Action Rating: 3 out of 5

Tuesday, July 28, 2026

Weather Forecast

Partly Cloudy
87.8°F
67°F
75.1°F
80%
0.47 in
82%
0%
5.8 mph
8.5


Air Quality

AQI: 1 - Good
PM2.5: 12.85 μg/m3
PM10: 13.03 μg/m3
Carbon Monoxide: 184.42 μg/m3
Nitrogen Dioxide: 9.3 μg/m3
Sulphur Dioxide: 1.44 μg/m3
Ozone: 67.54 μg/m3

Astronomical

Sunrise: 6:06 AM
Sun Transit: 1:15 PM
Sunset: 8:24 PM
Daylight: 14 hrs 18 mins
Moonrise: 8:11 PM
Moon Transit: 12:10 AM
Moonset: 4:51 AM
Moon Phase: Full
Moon Illumination: 99.7%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
1:50 PM - 4:20 PM

Minor Periods

7:41 PM - 9:11 PM
4:21 AM - 5:51 AM

Action Rating: 4 out of 5

Wednesday, July 29, 2026

Weather Forecast

Patchy rain nearby
90.3°F
66.3°F
72.9°F
85%
1.64 in
86%
0%
11.4 mph
8


Air Quality

AQI: 1 - Good
PM2.5: 3.36 μg/m3
PM10: 3.36 μg/m3
Carbon Monoxide: 228.78 μg/m3
Nitrogen Dioxide: 6.3 μg/m3
Sulphur Dioxide: 1.07 μg/m3
Ozone: 61.11 μg/m3

Astronomical

Sunrise: 6:07 AM
Sun Transit: 1:15 PM
Sunset: 8:23 PM
Daylight: 14 hrs 16 mins
Moonrise: 8:42 PM
Moon Transit: 1:00 AM
Moonset: 5:54 AM
Moon Phase: Full
Moon Illumination: 99.7%

Best Times for Fishing or Hunting

Major Periods

12:30 AM - 3:00 AM
2:38 PM - 5:08 PM

Minor Periods

8:12 PM - 9:42 PM
5:24 AM - 6:54 AM

Action Rating: 4 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.

Webcams Near McLean, VA

Sponsored Content