Water Temperature of Difficult Run in McLean, VA

Current Water Temperature

75.4°F

Measurement Time: Saturday, June 13, 2026, 11:15 PM EDT

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

66.9°F
Partly cloudy
Partly cloudy
66.9°F
68.5°F
90%
S 5.8 mph
12.2 mph
68°F
59°F
0 in
75%
9 mi
1013 mbar
0

Five Day Weather Forecast

Sunny
Sun
H: 99°F
L: 66°F
Patchy rain nearby
Mon
H: 79°F
L: 61°F
Patchy rain nearby
Tue
H: 81°F
L: 62°F
Partly Cloudy
Wed
H: 88°F
L: 62°F
Patchy rain nearby
Thu
H: 93°F
L: 67°F

Air Quality

AQI: 1 - Good
PM2.5: 17.9 μg/m3
PM10: 18.1 μg/m3
Carbon Monoxide: 165 μg/m3
Nitrogen Dioxide: 34.8 μg/m3
Sulphur Dioxide: 1.8 μg/m3
Ozone: 25 μg/m3

Astronomical

Sunrise: 5:43 AM
Sun Transit: 1:09 PM
Sunset: 8:36 PM
Daylight: 14 hrs 54 mins
Moonrise: 4:42 AM
Moon Transit: 12:40 AM
Moonset: 8:43 PM
Moon Phase: New
Moon Illumination: 0.7%

Best Times for Fishing or Hunting

Major Periods

1:23 AM - 3:53 AM
12:10 AM - 2:40 PM

Minor Periods

8:13 PM - 9:43 PM
4:12 AM - 5:42 AM

Action Rating: 5 out of 5

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

Effective: Sun June 14, 2026, 2:28 AM
Expires: Sun June 14, 2026, 2:38 AM

Monitoring message only. Please disregard.

Monitoring message only. Please disregard.
Sunday, June 14, 2026

Weather Forecast

Sunny
98.6°F
65.8°F
79.2°F
63%
0 in
4%
0%
15.9 mph
9.4


Air Quality

AQI: 1 - Good
PM2.5: 10.83 μg/m3
PM10: 11.44 μg/m3
Carbon Monoxide: 149.79 μg/m3
Nitrogen Dioxide: 14.88 μg/m3
Sulphur Dioxide: 1.3 μg/m3
Ozone: 78.46 μg/m3

Astronomical

Sunrise: 5:43 AM
Sun Transit: 1:09 PM
Sunset: 8:36 PM
Daylight: 14 hrs 54 mins
Moonrise: 4:42 AM
Moon Transit: 12:40 AM
Moonset: 8:43 PM
Moon Phase: New
Moon Illumination: 0.7%

Best Times for Fishing or Hunting

Major Periods

1:23 AM - 3:53 AM
12:10 AM - 2:40 PM

Minor Periods

8:13 PM - 9:43 PM
4:12 AM - 5:42 AM

Action Rating: 5 out of 5

Monday, June 15, 2026

Weather Forecast

Patchy rain nearby
79.1°F
61.1°F
69.6°F
57%
0 in
17%
0%
12.3 mph
9.2


Air Quality

AQI: 1 - Good
PM2.5: 2.31 μg/m3
PM10: 2.48 μg/m3
Carbon Monoxide: 126.58 μg/m3
Nitrogen Dioxide: 3.25 μg/m3
Sulphur Dioxide: 0.78 μg/m3
Ozone: 79.75 μg/m3

Astronomical

Sunrise: 5:43 AM
Sun Transit: 1:09 PM
Sunset: 8:37 PM
Daylight: 14 hrs 54 mins
Moonrise: 5:46 AM
Moon Transit: 1:48 PM
Moonset: 9:47 PM
Moon Phase: New
Moon Illumination: 3.8%

Best Times for Fishing or Hunting

Major Periods

2:31 AM - 5:01 AM
1:18 PM - 3:48 PM

Minor Periods

9:17 PM - 10:47 PM
5:16 AM - 6:46 AM

Action Rating: 4 out of 5

Tuesday, June 16, 2026

Weather Forecast

Patchy rain nearby
81.1°F
61.7°F
71°F
50%
0.04 in
36%
0%
6.3 mph
8.6


Air Quality

AQI: 1 - Good
PM2.5: 4.33 μg/m3
PM10: 4.83 μg/m3
Carbon Monoxide: 143.29 μg/m3
Nitrogen Dioxide: 6.28 μg/m3
Sulphur Dioxide: 1.07 μg/m3
Ozone: 87.38 μg/m3

Astronomical

Sunrise: 5:43 AM
Sun Transit: 1:09 PM
Sunset: 8:37 PM
Daylight: 14 hrs 54 mins
Moonrise: 7:00 AM
Moon Transit: 2:54 PM
Moonset: 10:39 PM
Moon Phase: New
Moon Illumination: 1.0%

Best Times for Fishing or Hunting

Major Periods

3:38 AM - 6:08 AM
2:24 PM - 4:54 PM

Minor Periods

10:09 PM - 11:39 PM
6:30 AM - 8:00 AM

Action Rating: 4 out of 5

Wednesday, June 17, 2026

Weather Forecast

Partly Cloudy
88.1°F
62.1°F
73.7°F
69%
0 in
8%
0%
12.5 mph
8.2


Air Quality

AQI: 1 - Good
PM2.5: 8.66 μg/m3
PM10: 10.45 μg/m3
Carbon Monoxide: 164.63 μg/m3
Nitrogen Dioxide: 8.93 μg/m3
Sulphur Dioxide: 1.4 μg/m3
Ozone: 89.54 μg/m3

Astronomical

Sunrise: 5:43 AM
Sun Transit: 1:10 PM
Sunset: 8:37 PM
Daylight: 14 hrs 55 mins
Moonrise: 8:19 AM
Moon Transit: 3:55 PM
Moonset: 11:19 PM
Moon Phase: Waxing Crescent
Moon Illumination: 4.6%

Best Times for Fishing or Hunting

Major Periods

4:41 AM - 7:11 AM
3:25 PM - 5:55 PM

Minor Periods

12:00 AM - 12:00 AM
7:49 AM - 9:19 AM

Action Rating: 2 out of 5

Thursday, June 18, 2026

Weather Forecast

Patchy rain nearby
93.2°F
67°F
77.1°F
68%
0.12 in
57%
0%
15.7 mph
0.2


Air Quality

AQI: 1 - Good
PM2.5: 13.82 μg/m3
PM10: 14.16 μg/m3
Carbon Monoxide: 308 μg/m3
Nitrogen Dioxide: 27.44 μg/m3
Sulphur Dioxide: 2.09 μg/m3
Ozone: 45.56 μg/m3

Astronomical

Sunrise: 5:43 AM
Sun Transit: 1:10 PM
Sunset: 8:38 PM
Daylight: 14 hrs 55 mins
Moonrise: 9:36 AM
Moon Transit: 4:50 PM
Moonset: 12:19 AM
Moon Phase: Waxing Crescent
Moon Illumination: 10.4%

Best Times for Fishing or Hunting

Major Periods

5:39 AM - 8:09 AM
4:20 PM - 6:50 PM

Minor Periods

9:06 AM - 10:36 AM
12:00 AM - 12:00 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.

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