Water Temperature of Difficult Run in McLean, VA

Current Water Temperature

66.9°F

Measurement Time: Sunday, May 31, 2026, 5:15 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

60.8°F
Clear
Clear
61.2°F
60.9°F
54%
ESE 2.5 mph
5.2 mph
61.2°F
42.5°F
0 in
2%
6 mi
1015 mbar
0

Five Day Weather Forecast

Sunny
Sun
H: 81°F
L: 50°F
Sunny
Mon
H: 76°F
L: 51°F
Patchy rain nearby
Tue
H: 71°F
L: 55°F
Sunny
Wed
H: 75°F
L: 49°F
Sunny
Thu
H: 79°F
L: 53°F

Air Quality

AQI: 1 - Good
PM2.5: 11.45 μg/m3
PM10: 13.25 μg/m3
Carbon Monoxide: 167.35 μg/m3
Nitrogen Dioxide: 12.35 μg/m3
Sulphur Dioxide: 2.15 μg/m3
Ozone: 60 μg/m3

Astronomical

Sunrise: 5:46 AM
Sun Transit: 1:06 PM
Sunset: 8:28 PM
Daylight: 14 hrs 43 mins
Moonrise: 9:19 PM
Moon Transit: 12:55 AM
Moonset: 5:27 AM
Moon Phase: Full
Moon Illumination: 99.6%

Best Times for Fishing or Hunting

Major Periods

12:25 AM - 2:55 AM
2:36 PM - 5:06 PM

Minor Periods

8:49 PM - 10:19 PM
4:57 AM - 6:27 AM

Action Rating: 4 out of 5

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

Effective: Sun May 31, 2026, 8:28 PM
Expires: Sun May 31, 2026, 8:38 PM

Monitoring message only. Please disregard.

Monitoring message only. Please disregard.


Coastal Flood Advisory issued May 31 at 7:13PM EDT until June 1 at 9:00AM EDT by NWS Baltimore MD/Washington DC

Effective: Sun May 31, 2026, 7:13 PM
Expires: Mon June 1, 2026, 3:00 AM

* WHAT...Up to one foot of inundation above ground level in low- lying areas due to tidal flooding. * WHERE...Shoreline in Anne Arundel County. * WHEN...From 3 AM to 9 AM EDT Monday, especially around the time of high tide. * IMPACTS...At 3.0 feet, Compromise Street begins to flood in Annapolis. Flooding of much of the City Dock parking lot is occurring. * ADDITIONAL DETAILS...Tides one to one and a half feet above normal. The next high tide at Annapolis U.S. Naval Academy is at 6:53 AM Sunday morning.

If travel is required, allow extra time as some roads may be closed. Do not drive around barricades or through water of unknown depth. Take the necessary actions to protect flood-prone property.
Sunday, May 31, 2026

Weather Forecast

Sunny
80.6°F
49.8°F
63.3°F
49%
0 in
0%
0%
6 mph
8.4


Air Quality

AQI: 1 - Good
PM2.5: 7.52 μg/m3
PM10: 8.55 μg/m3
Carbon Monoxide: 130.5 μg/m3
Nitrogen Dioxide: 9.15 μg/m3
Sulphur Dioxide: 2.07 μg/m3
Ozone: 57.33 μg/m3

Astronomical

Sunrise: 5:46 AM
Sun Transit: 1:06 PM
Sunset: 8:28 PM
Daylight: 14 hrs 43 mins
Moonrise: 9:19 PM
Moon Transit: 12:55 AM
Moonset: 5:27 AM
Moon Phase: Full
Moon Illumination: 99.6%

Best Times for Fishing or Hunting

Major Periods

12:25 AM - 2:55 AM
2:36 PM - 5:06 PM

Minor Periods

8:49 PM - 10:19 PM
4:57 AM - 6:27 AM

Action Rating: 4 out of 5

Monday, June 1, 2026

Weather Forecast

Sunny
75.5°F
51.4°F
63.9°F
57%
0 in
0%
0%
9.4 mph
8


Air Quality

AQI: 1 - Good
PM2.5: 8.38 μg/m3
PM10: 9.38 μg/m3
Carbon Monoxide: 162.77 μg/m3
Nitrogen Dioxide: 10.56 μg/m3
Sulphur Dioxide: 1.39 μg/m3
Ozone: 70.29 μg/m3

Astronomical

Sunrise: 5:45 AM
Sun Transit: 1:06 PM
Sunset: 8:29 PM
Daylight: 14 hrs 44 mins
Moonrise: 10:11 PM
Moon Transit: 1:46 AM
Moonset: 6:13 AM
Moon Phase: Full
Moon Illumination: 96.8%

Best Times for Fishing or Hunting

Major Periods

1:16 AM - 3:46 AM
3:27 PM - 5:57 PM

Minor Periods

9:41 PM - 11:11 PM
5:43 AM - 7:13 AM

Action Rating: 4 out of 5

Tuesday, June 2, 2026

Weather Forecast

Patchy rain nearby
71.4°F
54.9°F
62.2°F
65%
0.05 in
87%
0%
11.2 mph
7


Air Quality

AQI: 1 - Good
PM2.5: 7.53 μg/m3
PM10: 8.12 μg/m3
Carbon Monoxide: 172.33 μg/m3
Nitrogen Dioxide: 11.12 μg/m3
Sulphur Dioxide: 1.18 μg/m3
Ozone: 70 μg/m3

Astronomical

Sunrise: 5:45 AM
Sun Transit: 1:07 PM
Sunset: 8:30 PM
Daylight: 14 hrs 45 mins
Moonrise: 10:56 PM
Moon Transit: 2:37 AM
Moonset: 7:06 AM
Moon Phase: Full
Moon Illumination: 91.7%

Best Times for Fishing or Hunting

Major Periods

2:07 AM - 4:37 AM
4:19 PM - 6:49 PM

Minor Periods

10:26 PM - 11:56 PM
6:36 AM - 8:06 AM

Action Rating: 3 out of 5

Wednesday, June 3, 2026

Weather Forecast

Sunny
75.3°F
49°F
62.7°F
57%
0 in
0%
0%
11.6 mph
7.7


Air Quality

AQI: 1 - Good
PM2.5: 8.3 μg/m3
PM10: 9.25 μg/m3
Carbon Monoxide: 193.13 μg/m3
Nitrogen Dioxide: 16.53 μg/m3
Sulphur Dioxide: 1.02 μg/m3
Ozone: 67.17 μg/m3

Astronomical

Sunrise: 5:44 AM
Sun Transit: 1:07 PM
Sunset: 8:30 PM
Daylight: 14 hrs 46 mins
Moonrise: 11:34 PM
Moon Transit: 3:28 AM
Moonset: 8:04 AM
Moon Phase: Waning Gibbous
Moon Illumination: 84.4%

Best Times for Fishing or Hunting

Major Periods

2:58 AM - 5:28 AM
5:08 PM - 7:38 PM

Minor Periods

12:00 AM - 12:00 AM
7:34 AM - 9:04 AM

Action Rating: 3 out of 5

Thursday, June 4, 2026

Weather Forecast

Sunny
78.5°F
52.6°F
64.7°F
58%
0 in
0%
0%
11.6 mph
1


Air Quality

AQI: 1 - Good
PM2.5: 12.41 μg/m3
PM10: 13.42 μg/m3
Carbon Monoxide: 286.44 μg/m3
Nitrogen Dioxide: 27.74 μg/m3
Sulphur Dioxide: 1.46 μg/m3
Ozone: 34.22 μg/m3

Astronomical

Sunrise: 5:44 AM
Sun Transit: 1:07 PM
Sunset: 8:31 PM
Daylight: 14 hrs 47 mins
Moonrise: 12:34 AM
Moon Transit: 4:17 AM
Moonset: 9:06 AM
Moon Phase: Waning Gibbous
Moon Illumination: 75.3%

Best Times for Fishing or Hunting

Major Periods

3:47 AM - 6:17 AM
5:56 PM - 8:26 PM

Minor Periods

8:36 AM - 10:06 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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