Water Temperature of Difficult Run in McLean, VA

Current Water Temperature

68.4°F

Measurement Time: Friday, April 17, 2026, 6:15 AM 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

73.9°F
Partly cloudy
Partly cloudy
76.4°F
78.2°F
48%
NW 10.3 mph
11.8 mph
77.3°F
54.4°F
0 in
50%
9 mi
1014 mbar
5

Five Day Weather Forecast

Sunny
Fri
H: 86°F
L: 65°F
Partly Cloudy
Sat
H: 84°F
L: 62°F
Patchy rain nearby
Sun
H: 61°F
L: 44°F
Partly Cloudy
Mon
H: 51°F
L: 38°F
Sunny
Tue
H: 67°F
L: 35°F

Air Quality

AQI: 1 - Good
PM2.5: 7.85 μg/m3
PM10: 9.55 μg/m3
Carbon Monoxide: 145.85 μg/m3
Nitrogen Dioxide: 2.15 μg/m3
Sulphur Dioxide: 3.55 μg/m3
Ozone: 129 μg/m3

Astronomical

Sunrise: 6:30 AM
Sun Transit: 1:08 PM
Sunset: 7:48 PM
Daylight: 13 hrs 18 mins
Moonrise: 6:14 AM
Moon Transit: 1:14 PM
Moonset: 8:28 PM
Moon Phase: New
Moon Illumination: 4.1%

Best Times for Fishing or Hunting

Major Periods

2:03 AM - 4:33 AM
12:44 AM - 3:14 PM

Minor Periods

7:58 PM - 9:28 PM
5:44 AM - 7:14 AM

Action Rating: 4 out of 5

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

Effective: Fri April 17, 2026, 8:29 AM
Expires: Fri April 17, 2026, 8:39 AM

Monitoring message only. Please disregard.

Monitoring message only. Please disregard.
Friday, April 17, 2026

Weather Forecast

Sunny
85.5°F
65.1°F
74.8°F
54%
0 in
0%
0%
12.8 mph
1.8


Air Quality

AQI: 1 - Good
PM2.5: 8.33 μg/m3
PM10: 9.18 μg/m3
Carbon Monoxide: 175.25 μg/m3
Nitrogen Dioxide: 7.43 μg/m3
Sulphur Dioxide: 4.9 μg/m3
Ozone: 99.48 μg/m3

Astronomical

Sunrise: 6:30 AM
Sun Transit: 1:08 PM
Sunset: 7:48 PM
Daylight: 13 hrs 18 mins
Moonrise: 6:14 AM
Moon Transit: 1:14 PM
Moonset: 8:28 PM
Moon Phase: New
Moon Illumination: 4.1%

Best Times for Fishing or Hunting

Major Periods

2:03 AM - 4:33 AM
12:44 AM - 3:14 PM

Minor Periods

7:58 PM - 9:28 PM
5:44 AM - 7:14 AM

Action Rating: 4 out of 5

Saturday, April 18, 2026

Weather Forecast

Partly Cloudy
84.2°F
61.9°F
71.5°F
64%
0 in
0%
0%
11.2 mph
2


Air Quality

AQI: 2 - Moderate
PM2.5: 15.55 μg/m3
PM10: 16.49 μg/m3
Carbon Monoxide: 199.45 μg/m3
Nitrogen Dioxide: 22.06 μg/m3
Sulphur Dioxide: 6.78 μg/m3
Ozone: 90 μg/m3

Astronomical

Sunrise: 6:28 AM
Sun Transit: 1:08 PM
Sunset: 7:49 PM
Daylight: 13 hrs 21 mins
Moonrise: 6:47 AM
Moon Transit: 2:10 PM
Moonset: 9:47 PM
Moon Phase: New
Moon Illumination: 1.2%

Best Times for Fishing or Hunting

Major Periods

2:57 AM - 5:27 AM
1:40 PM - 4:10 PM

Minor Periods

9:17 PM - 10:47 PM
6:17 AM - 7:47 AM

Action Rating: 4 out of 5

Sunday, April 19, 2026

Weather Forecast

Patchy rain nearby
60.8°F
44.3°F
54.8°F
66%
0.16 in
86%
0%
16.8 mph
0.4


Air Quality

AQI: 1 - Good
PM2.5: 6.38 μg/m3
PM10: 6.94 μg/m3
Carbon Monoxide: 173.93 μg/m3
Nitrogen Dioxide: 8.13 μg/m3
Sulphur Dioxide: 4.17 μg/m3
Ozone: 95.92 μg/m3

Astronomical

Sunrise: 6:27 AM
Sun Transit: 1:08 PM
Sunset: 7:50 PM
Daylight: 13 hrs 23 mins
Moonrise: 7:27 AM
Moon Transit: 3:11 PM
Moonset: 11:06 PM
Moon Phase: Waxing Crescent
Moon Illumination: 4.9%

Best Times for Fishing or Hunting

Major Periods

3:56 AM - 6:26 AM
2:41 PM - 5:11 PM

Minor Periods

12:00 AM - 12:00 AM
6:57 AM - 8:27 AM

Action Rating: 3 out of 5

Monday, April 20, 2026

Weather Forecast

Partly Cloudy
51.1°F
37.9°F
44.4°F
46%
0 in
0%
0%
14.1 mph
1.5


Air Quality

AQI: 1 - Good
PM2.5: 4.89 μg/m3
PM10: 5.24 μg/m3
Carbon Monoxide: 171.38 μg/m3
Nitrogen Dioxide: 6.65 μg/m3
Sulphur Dioxide: 3.84 μg/m3
Ozone: 87.6 μg/m3

Astronomical

Sunrise: 6:25 AM
Sun Transit: 1:07 PM
Sunset: 7:51 PM
Daylight: 13 hrs 26 mins
Moonrise: 8:17 AM
Moon Transit: 4:15 PM
Moonset: 12:06 AM
Moon Phase: Waxing Crescent
Moon Illumination: 10.8%

Best Times for Fishing or Hunting

Major Periods

5:00 AM - 7:30 AM
3:45 PM - 6:15 PM

Minor Periods

7:47 AM - 9:17 AM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Tuesday, April 21, 2026

Weather Forecast

Sunny
66.9°F
35.2°F
48.4°F
41%
0 in
0%
0%
11.6 mph
0.1


Air Quality

AQI: 1 - Good
PM2.5: 4.75 μg/m3
PM10: 4.9 μg/m3
Carbon Monoxide: 189.44 μg/m3
Nitrogen Dioxide: 8.96 μg/m3
Sulphur Dioxide: 3.63 μg/m3
Ozone: 68.23 μg/m3

Astronomical

Sunrise: 6:24 AM
Sun Transit: 1:07 PM
Sunset: 7:52 PM
Daylight: 13 hrs 28 mins
Moonrise: 9:18 AM
Moon Transit: 5:20 PM
Moonset: 12:19 AM
Moon Phase: Waxing Crescent
Moon Illumination: 18.8%

Best Times for Fishing or Hunting

Major Periods

6:05 AM - 8:35 AM
4:50 PM - 7:20 PM

Minor Periods

8:48 AM - 10:18 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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