Water Temperature of Difficult Run in McLean, VA

Current Water Temperature

63.0°F

Measurement Time: Tuesday, March 31, 2026, 4:15 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

79°F
Partly cloudy
Partly cloudy
79.2°F
77.9°F
42%
SW 9.8 mph
18.7 mph
76.6°F
51.3°F
0 in
75%
9 mi
1015 mbar
0

Five Day Weather Forecast

Sunny
Tue
H: 87°F
L: 60°F
Patchy rain nearby
Wed
H: 87°F
L: 62°F
Moderate rain
Thu
H: 72°F
L: 57°F
Patchy rain nearby
Fri
H: 78°F
L: 51°F
Partly Cloudy
Sat
H: 83°F
L: 61°F

Air Quality

AQI: 1 - Good
PM2.5: 8.25 μg/m3
PM10: 8.65 μg/m3
Carbon Monoxide: 169.85 μg/m3
Nitrogen Dioxide: 8.55 μg/m3
Sulphur Dioxide: 3.85 μg/m3
Ozone: 91 μg/m3

Astronomical

Sunrise: 6:55 AM
Sun Transit: 1:13 PM
Sunset: 7:32 PM
Daylight: 12 hrs 36 mins
Moonrise: 6:23 PM
Moon Transit: 12:00 AM
Moonset: 6:07 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 97.6%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
1:24 PM - 3:54 PM

Minor Periods

5:53 PM - 7:23 PM
5:37 AM - 7:07 AM

Action Rating: 4 out of 5

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

Effective: Tue March 31, 2026, 8:28 PM
Expires: Tue March 31, 2026, 8:38 PM

Monitoring message only. Please disregard.

Monitoring message only. Please disregard.
Tuesday, March 31, 2026

Weather Forecast

Sunny
87.3°F
60.4°F
72.7°F
50%
0 in
0%
0%
14.5 mph
1.4


Air Quality

AQI: 1 - Good
PM2.5: 8.05 μg/m3
PM10: 8.5 μg/m3
Carbon Monoxide: 184.05 μg/m3
Nitrogen Dioxide: 8.24 μg/m3
Sulphur Dioxide: 3.26 μg/m3
Ozone: 85.6 μg/m3

Astronomical

Sunrise: 6:55 AM
Sun Transit: 1:13 PM
Sunset: 7:32 PM
Daylight: 12 hrs 36 mins
Moonrise: 6:23 PM
Moon Transit: 12:00 AM
Moonset: 6:07 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 97.6%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
1:24 PM - 3:54 PM

Minor Periods

5:53 PM - 7:23 PM
5:37 AM - 7:07 AM

Action Rating: 4 out of 5

Wednesday, April 1, 2026

Weather Forecast

Patchy rain nearby
87.3°F
62.4°F
72.3°F
66%
0.05 in
81%
0%
13 mph
1.5


Air Quality

AQI: 1 - Good
PM2.5: 7.76 μg/m3
PM10: 8.11 μg/m3
Carbon Monoxide: 179.25 μg/m3
Nitrogen Dioxide: 7.44 μg/m3
Sulphur Dioxide: 3.65 μg/m3
Ozone: 87.64 μg/m3

Astronomical

Sunrise: 6:54 AM
Sun Transit: 1:12 PM
Sunset: 7:33 PM
Daylight: 12 hrs 39 mins
Moonrise: 7:26 PM
Moon Transit: 12:30 AM
Moonset: 6:29 AM
Moon Phase: Full
Moon Illumination: 99.8%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 2:30 AM
2:07 PM - 4:37 PM

Minor Periods

6:56 PM - 8:26 PM
5:59 AM - 7:29 AM

Action Rating: 3 out of 5

Thursday, April 2, 2026

Weather Forecast

Moderate rain
71.8°F
57.2°F
64.2°F
83%
0.22 in
79%
0%
10.5 mph
0.7


Air Quality

AQI: 1 - Good
PM2.5: 14.23 μg/m3
PM10: 14.56 μg/m3
Carbon Monoxide: 254.85 μg/m3
Nitrogen Dioxide: 18.97 μg/m3
Sulphur Dioxide: 4.94 μg/m3
Ozone: 60.6 μg/m3

Astronomical

Sunrise: 6:52 AM
Sun Transit: 1:12 PM
Sunset: 7:34 PM
Daylight: 12 hrs 41 mins
Moonrise: 8:30 PM
Moon Transit: 1:13 AM
Moonset: 6:51 AM
Moon Phase: Full
Moon Illumination: 99.5%

Best Times for Fishing or Hunting

Major Periods

12:43 AM - 3:13 AM
2:49 PM - 5:19 PM

Minor Periods

8:00 PM - 9:30 PM
6:21 AM - 7:51 AM

Action Rating: 4 out of 5

Friday, April 3, 2026

Weather Forecast

Patchy rain nearby
77.5°F
50.5°F
63.1°F
76%
0.02 in
75%
0%
12.5 mph
1.5


Air Quality

AQI: 1 - Good
PM2.5: 7.35 μg/m3
PM10: 7.99 μg/m3
Carbon Monoxide: 199.96 μg/m3
Nitrogen Dioxide: 11.14 μg/m3
Sulphur Dioxide: 4.06 μg/m3
Ozone: 78.76 μg/m3

Astronomical

Sunrise: 6:51 AM
Sun Transit: 1:12 PM
Sunset: 7:34 PM
Daylight: 12 hrs 44 mins
Moonrise: 9:33 PM
Moon Transit: 1:56 AM
Moonset: 7:14 AM
Moon Phase: Full
Moon Illumination: 96.6%

Best Times for Fishing or Hunting

Major Periods

1:26 AM - 3:56 AM
3:33 PM - 6:03 PM

Minor Periods

9:03 PM - 10:33 PM
6:44 AM - 8:14 AM

Action Rating: 4 out of 5

Saturday, April 4, 2026

Weather Forecast

Partly Cloudy
82.8°F
60.9°F
70.8°F
67%
0 in
0%
0%
13.4 mph
1.6


Air Quality

AQI: 1 - Good
PM2.5: 9.74 μg/m3
PM10: 10.07 μg/m3
Carbon Monoxide: 240.7 μg/m3
Nitrogen Dioxide: 20.23 μg/m3
Sulphur Dioxide: 4.11 μg/m3
Ozone: 49.54 μg/m3

Astronomical

Sunrise: 6:49 AM
Sun Transit: 1:11 PM
Sunset: 7:35 PM
Daylight: 12 hrs 46 mins
Moonrise: 10:36 PM
Moon Transit: 2:40 AM
Moonset: 7:41 AM
Moon Phase: Full
Moon Illumination: 91.3%

Best Times for Fishing or Hunting

Major Periods

2:10 AM - 4:40 AM
4:18 PM - 6:48 PM

Minor Periods

10:06 PM - 11:36 PM
7:11 AM - 8:41 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.

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