Water Temperature of Difficult Run in McLean, VA

Current Water Temperature

77.2°F

Measurement Time: Saturday, July 11, 2026, 10:00 PM 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

72°F
Partly cloudy
Partly cloudy
76.3°F
78.9°F
82%
SE 4.5 mph
9.4 mph
75°F
70.9°F
0 in
75%
9 mi
1022 mbar
0

Five Day Weather Forecast

Cloudy
Sun
H: 83°F
L: 72°F
Sunny
Mon
H: 87°F
L: 66°F
Sunny
Tue
H: 93°F
L: 66°F
Sunny
Wed
H: 101°F
L: 73°F
Sunny
Thu
H: 93°F
L: 74°F

Air Quality

AQI: 1 - Good
PM2.5: 10 μg/m3
PM10: 12.5 μg/m3
Carbon Monoxide: 179 μg/m3
Nitrogen Dioxide: 9.2 μg/m3
Sulphur Dioxide: 1.2 μg/m3
Ozone: 72 μg/m3

Astronomical

Sunrise: 5:54 AM
Sun Transit: 1:14 PM
Sunset: 8:36 PM
Daylight: 14 hrs 42 mins
Moonrise: 3:23 AM
Moon Transit: 11:25 AM
Moonset: 7:28 PM
Moon Phase: Waning Crescent
Moon Illumination: 0.8%

Best Times for Fishing or Hunting

Major Periods

12:09 AM - 2:39 AM
10:55 AM - 1:25 PM

Minor Periods

6:58 PM - 8:28 PM
2:53 AM - 4:23 AM

Action Rating: 3 out of 5

Sunday, July 12, 2026

Weather Forecast

Cloudy
82.8°F
72°F
76.4°F
84%
0.62 in
83%
0%
7.6 mph
7.5


Air Quality

AQI: 1 - Good
PM2.5: 8.18 μg/m3
PM10: 9.25 μg/m3
Carbon Monoxide: 176.5 μg/m3
Nitrogen Dioxide: 6.75 μg/m3
Sulphur Dioxide: 1.48 μg/m3
Ozone: 86.92 μg/m3

Astronomical

Sunrise: 5:54 AM
Sun Transit: 1:14 PM
Sunset: 8:36 PM
Daylight: 14 hrs 42 mins
Moonrise: 3:23 AM
Moon Transit: 11:25 AM
Moonset: 7:28 PM
Moon Phase: Waning Crescent
Moon Illumination: 0.8%

Best Times for Fishing or Hunting

Major Periods

12:09 AM - 2:39 AM
10:55 AM - 1:25 PM

Minor Periods

6:58 PM - 8:28 PM
2:53 AM - 4:23 AM

Action Rating: 3 out of 5

Monday, July 13, 2026

Weather Forecast

Sunny
86.6°F
66.2°F
76°F
63%
0 in
4%
0%
6.5 mph
9


Air Quality

AQI: 1 - Good
PM2.5: 9.99 μg/m3
PM10: 12.76 μg/m3
Carbon Monoxide: 175.42 μg/m3
Nitrogen Dioxide: 9.23 μg/m3
Sulphur Dioxide: 1.38 μg/m3
Ozone: 71.25 μg/m3

Astronomical

Sunrise: 5:54 AM
Sun Transit: 1:14 PM
Sunset: 8:35 PM
Daylight: 14 hrs 41 mins
Moonrise: 4:33 AM
Moon Transit: 12:32 AM
Moonset: 8:26 PM
Moon Phase: New
Moon Illumination: 0.1%

Best Times for Fishing or Hunting

Major Periods

1:16 AM - 3:46 AM
12:02 AM - 2:32 PM

Minor Periods

7:56 PM - 9:26 PM
4:03 AM - 5:33 AM

Action Rating: 4 out of 5

Tuesday, July 14, 2026

Weather Forecast

Sunny
92.8°F
65.5°F
79.2°F
60%
0 in
3%
0%
6.3 mph
9.5


Air Quality

AQI: 1 - Good
PM2.5: 13.16 μg/m3
PM10: 15.84 μg/m3
Carbon Monoxide: 189.17 μg/m3
Nitrogen Dioxide: 13.27 μg/m3
Sulphur Dioxide: 1.54 μg/m3
Ozone: 82.33 μg/m3

Astronomical

Sunrise: 5:55 AM
Sun Transit: 1:14 PM
Sunset: 8:35 PM
Daylight: 14 hrs 40 mins
Moonrise: 5:50 AM
Moon Transit: 1:36 PM
Moonset: 9:11 PM
Moon Phase: New
Moon Illumination: 1.9%

Best Times for Fishing or Hunting

Major Periods

2:21 AM - 4:51 AM
1:06 PM - 3:36 PM

Minor Periods

8:41 PM - 10:11 PM
5:20 AM - 6:50 AM

Action Rating: 4 out of 5

Wednesday, July 15, 2026

Weather Forecast

Sunny
101.1°F
73.1°F
85.7°F
56%
0 in
3%
0%
8.5 mph
9.9


Air Quality

AQI: 1 - Good
PM2.5: 8.48 μg/m3
PM10: 9.2 μg/m3
Carbon Monoxide: 165.2 μg/m3
Nitrogen Dioxide: 6 μg/m3
Sulphur Dioxide: 1.87 μg/m3
Ozone: 97.13 μg/m3

Astronomical

Sunrise: 5:56 AM
Sun Transit: 1:15 PM
Sunset: 8:34 PM
Daylight: 14 hrs 38 mins
Moonrise: 7:10 AM
Moon Transit: 2:35 PM
Moonset: 9:48 PM
Moon Phase: New
Moon Illumination: 0.2%

Best Times for Fishing or Hunting

Major Periods

3:22 AM - 5:52 AM
2:05 PM - 4:35 PM

Minor Periods

9:18 PM - 10:48 PM
6:40 AM - 8:10 AM

Action Rating: 4 out of 5

Thursday, July 16, 2026

Weather Forecast

Sunny
93°F
74.3°F
82.7°F
56%
0.03 in
36%
0%
12.1 mph
9.7


Air Quality

AQI: 1 - Good
PM2.5: 9.03 μg/m3
PM10: 9.43 μg/m3
Carbon Monoxide: 249 μg/m3
Nitrogen Dioxide: 5.73 μg/m3
Sulphur Dioxide: 2.99 μg/m3
Ozone: 80.33 μg/m3

Astronomical

Sunrise: 5:57 AM
Sun Transit: 1:15 PM
Sunset: 8:34 PM
Daylight: 14 hrs 37 mins
Moonrise: 8:27 AM
Moon Transit: 3:28 PM
Moonset: 10:18 PM
Moon Phase: New
Moon Illumination: 2.4%

Best Times for Fishing or Hunting

Major Periods

4:18 AM - 6:48 AM
2:58 PM - 5:28 PM

Minor Periods

9:48 PM - 11:18 PM
7:57 AM - 9:27 AM

Action Rating: 3 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