Water Temperature of Difficult Run in McLean, VA

Current Water Temperature

75.7°F

Measurement Time: Sunday, June 21, 2026, 11:15 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

86.7°F
Partly cloudy
Partly cloudy
83°F
89.1°F
30%
NNW 9.2 mph
10.6 mph
92.3°F
47.8°F
0 in
75%
9 mi
1013 mbar
5.1

Five Day Weather Forecast

Sunny
Sun
H: 93°F
L: 66°F
Moderate rain
Mon
H: 92°F
L: 65°F
Patchy rain nearby
Tue
H: 81°F
L: 65°F
Sunny
Wed
H: 81°F
L: 59°F
Patchy rain nearby
Thu
H: 88°F
L: 61°F

Air Quality

AQI: 1 - Good
PM2.5: 3.1 μg/m3
PM10: 3.2 μg/m3
Carbon Monoxide: 105 μg/m3
Nitrogen Dioxide: 0.8 μg/m3
Sulphur Dioxide: 0.9 μg/m3
Ozone: 114 μg/m3

Astronomical

Sunrise: 5:43 AM
Sun Transit: 1:10 PM
Sunset: 8:38 PM
Daylight: 14 hrs 55 mins
Moonrise: 1:03 PM
Moon Transit: 7:08 PM
Moonset: 12:42 AM
Moon Phase: First Quarter
Moon Illumination: 38.5%

Best Times for Fishing or Hunting

Major Periods

8:02 AM - 10:32 AM
6:38 PM - 9:08 PM

Minor Periods

12:33 AM - 2:03 PM
12:12 AM - 1:42 AM

Action Rating: 3 out of 5

Small Craft Advisory issued June 21 at 9:17AM EDT until June 22 at 6:00PM EDT by NWS Baltimore MD/Washington DC

Effective: Sun June 21, 2026, 9:17 AM
Expires: Sun June 21, 2026, 5:30 PM

* WHAT...South winds 10 to 20 kt with gusts up to 30 kt and waves 2 to 4 ft expected. * WHERE...Chesapeake Bay from Pooles Island MD to Smith Point VA, Chester River to Queenstown MD, Eastern Bay, Choptank River to Cambridge MD and the Little Choptank River, and Tangier Sound and the inland waters surrounding Bloodsworth Island. * WHEN...From 9 AM to 6 PM EDT Monday. * IMPACTS...Conditions will be hazardous to small craft.

Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions.
Sunday, June 21, 2026

Weather Forecast

Sunny
93.4°F
65.5°F
77.2°F
46%
0 in
17%
0%
10.5 mph
9.5


Air Quality

AQI: 1 - Good
PM2.5: 4.93 μg/m3
PM10: 5.14 μg/m3
Carbon Monoxide: 126 μg/m3
Nitrogen Dioxide: 4.7 μg/m3
Sulphur Dioxide: 1.28 μg/m3
Ozone: 87.71 μg/m3

Astronomical

Sunrise: 5:43 AM
Sun Transit: 1:10 PM
Sunset: 8:38 PM
Daylight: 14 hrs 55 mins
Moonrise: 1:03 PM
Moon Transit: 7:08 PM
Moonset: 12:42 AM
Moon Phase: First Quarter
Moon Illumination: 38.5%

Best Times for Fishing or Hunting

Major Periods

8:02 AM - 10:32 AM
6:38 PM - 9:08 PM

Minor Periods

12:33 AM - 2:03 PM
12:12 AM - 1:42 AM

Action Rating: 3 out of 5

Monday, June 22, 2026

Weather Forecast

Moderate rain
91.7°F
65.3°F
73.7°F
74%
0.31 in
73%
0%
11.9 mph
9.2


Air Quality

AQI: 1 - Good
PM2.5: 9.03 μg/m3
PM10: 9.25 μg/m3
Carbon Monoxide: 156.83 μg/m3
Nitrogen Dioxide: 13.7 μg/m3
Sulphur Dioxide: 1.4 μg/m3
Ozone: 77.17 μg/m3

Astronomical

Sunrise: 5:44 AM
Sun Transit: 1:11 PM
Sunset: 8:39 PM
Daylight: 14 hrs 55 mins
Moonrise: 2:06 PM
Moon Transit: 7:51 PM
Moonset: 1:04 AM
Moon Phase: First Quarter
Moon Illumination: 49.7%

Best Times for Fishing or Hunting

Major Periods

8:44 AM - 11:14 AM
7:21 PM - 9:51 PM

Minor Periods

1:36 PM - 3:06 PM
12:34 AM - 2:04 AM

Action Rating: 2 out of 5

Tuesday, June 23, 2026

Weather Forecast

Patchy rain nearby
81.2°F
64.6°F
71.3°F
83%
0.12 in
73%
0%
13.2 mph
3.2


Air Quality

AQI: 1 - Good
PM2.5: 4.82 μg/m3
PM10: 4.95 μg/m3
Carbon Monoxide: 131.86 μg/m3
Nitrogen Dioxide: 7.75 μg/m3
Sulphur Dioxide: 0.83 μg/m3
Ozone: 72.88 μg/m3

Astronomical

Sunrise: 5:44 AM
Sun Transit: 1:11 PM
Sunset: 8:39 PM
Daylight: 14 hrs 55 mins
Moonrise: 3:08 PM
Moon Transit: 8:33 PM
Moonset: 1:27 AM
Moon Phase: First Quarter
Moon Illumination: 61.0%

Best Times for Fishing or Hunting

Major Periods

9:27 AM - 11:57 AM
8:03 PM - 10:33 PM

Minor Periods

2:38 PM - 4:08 PM
12:57 AM - 2:27 AM

Action Rating: 2 out of 5

Wednesday, June 24, 2026

Weather Forecast

Sunny
81.2°F
59°F
70.6°F
60%
0 in
4%
0%
7.6 mph
9.3


Air Quality

AQI: 1 - Good
PM2.5: 5.35 μg/m3
PM10: 5.42 μg/m3
Carbon Monoxide: 182 μg/m3
Nitrogen Dioxide: 10.64 μg/m3
Sulphur Dioxide: 1.21 μg/m3
Ozone: 76.58 μg/m3

Astronomical

Sunrise: 5:44 AM
Sun Transit: 1:11 PM
Sunset: 8:39 PM
Daylight: 14 hrs 55 mins
Moonrise: 4:11 PM
Moon Transit: 9:17 PM
Moonset: 1:51 AM
Moon Phase: First Quarter
Moon Illumination: 71.7%

Best Times for Fishing or Hunting

Major Periods

10:10 AM - 12:40 AM
8:47 PM - 11:17 PM

Minor Periods

3:41 PM - 5:11 PM
1:21 AM - 2:51 AM

Action Rating: 3 out of 5

Thursday, June 25, 2026

Weather Forecast

Patchy rain nearby
87.7°F
61.4°F
72.2°F
62%
0.09 in
57%
0%
10.1 mph
1


Air Quality

AQI: 1 - Good
PM2.5: 6.91 μg/m3
PM10: 7.02 μg/m3
Carbon Monoxide: 201.67 μg/m3
Nitrogen Dioxide: 18.68 μg/m3
Sulphur Dioxide: 1.56 μg/m3
Ozone: 41.89 μg/m3

Astronomical

Sunrise: 5:45 AM
Sun Transit: 1:11 PM
Sunset: 8:39 PM
Daylight: 14 hrs 54 mins
Moonrise: 5:13 PM
Moon Transit: 10:03 PM
Moonset: 2:18 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 81.2%

Best Times for Fishing or Hunting

Major Periods

10:55 AM - 1:25 PM
12:00 AM - 12:00 AM

Minor Periods

4:43 PM - 6:13 PM
1:48 AM - 3:18 AM

Action Rating: 2 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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