Water Temperature of Difficult Run in McLean, VA

Current Water Temperature

79.2°F

Measurement Time: Saturday, July 18, 2026, 7:15 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

75.9°F
Partly cloudy
Partly cloudy
80.1°F
80.4°F
91%
SW 5.8 mph
12.2 mph
76.1°F
72.3°F
0 in
75%
9 mi
1009 mbar
0

Five Day Weather Forecast

Sunny
Sun
H: 87°F
L: 72°F
Partly Cloudy
Mon
H: 89°F
L: 64°F
Partly Cloudy
Tue
H: 92°F
L: 69°F
Sunny
Wed
H: 86°F
L: 67°F
Sunny
Thu
H: 82°F
L: 60°F

Air Quality

AQI: 1 - Good
PM2.5: 5 μg/m3
PM10: 5.1 μg/m3
Carbon Monoxide: 165 μg/m3
Nitrogen Dioxide: 4.7 μg/m3
Sulphur Dioxide: 1.3 μg/m3
Ozone: 76 μg/m3

Astronomical

Sunrise: 5:59 AM
Sun Transit: 1:15 PM
Sunset: 8:32 PM
Daylight: 14 hrs 33 mins
Moonrise: 11:53 AM
Moon Transit: 5:46 PM
Moonset: 12:07 AM
Moon Phase: Waxing Crescent
Moon Illumination: 22.6%

Best Times for Fishing or Hunting

Major Periods

6:39 AM - 9:09 AM
5:16 PM - 7:46 PM

Minor Periods

11:23 AM - 12:53 AM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Tornado Watch issued July 18 at 2:19PM EDT until July 18 at 9:00PM EDT by NWS Baltimore MD/Washington DC

Effective: Sat July 18, 2026, 2:19 PM
Expires: Sat July 18, 2026, 9:00 PM

THE NATIONAL WEATHER SERVICE HAS ISSUED TORNADO WATCH 495 UNTIL 9 PM EDT THIS EVENING WHICH REPLACES A PORTION OF SEVERE THUNDERSTORM WATCH 496. THE NEW WATCH IS VALID FOR THE FOLLOWING AREAS THE NEW WATCH INCLUDES THE FOLLOWING ADJACENT COASTAL WATERS TIDAL POTOMAC FROM KEY BRIDGE TO INDIAN HEAD MD CHESTER RIVER TO QUEENSTOWN MD EASTERN BAY
Sunday, July 19, 2026

Weather Forecast

Sunny
87.2°F
71.8°F
79°F
64%
0.01 in
17%
0%
10.1 mph
6.6


Air Quality

AQI: 1 - Good
PM2.5: 10.71 μg/m3
PM10: 10.81 μg/m3
Carbon Monoxide: 284.46 μg/m3
Nitrogen Dioxide: 4.64 μg/m3
Sulphur Dioxide: 1.28 μg/m3
Ozone: 98.13 μg/m3

Astronomical

Sunrise: 5:59 AM
Sun Transit: 1:15 PM
Sunset: 8:32 PM
Daylight: 14 hrs 33 mins
Moonrise: 11:53 AM
Moon Transit: 5:46 PM
Moonset: 12:07 AM
Moon Phase: Waxing Crescent
Moon Illumination: 22.6%

Best Times for Fishing or Hunting

Major Periods

6:39 AM - 9:09 AM
5:16 PM - 7:46 PM

Minor Periods

11:23 AM - 12:53 AM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Monday, July 20, 2026

Weather Forecast

Partly Cloudy
89.1°F
64.4°F
77.4°F
52%
0 in
4%
0%
10.3 mph
7.4


Air Quality

AQI: 1 - Good
PM2.5: 11.11 μg/m3
PM10: 11.38 μg/m3
Carbon Monoxide: 238.25 μg/m3
Nitrogen Dioxide: 9.98 μg/m3
Sulphur Dioxide: 1.79 μg/m3
Ozone: 89.75 μg/m3

Astronomical

Sunrise: 6:00 AM
Sun Transit: 1:15 PM
Sunset: 8:31 PM
Daylight: 14 hrs 31 mins
Moonrise: 12:58 AM
Moon Transit: 6:29 PM
Moonset: 12:29 AM
Moon Phase: Waxing Crescent
Moon Illumination: 32.7%

Best Times for Fishing or Hunting

Major Periods

7:23 AM - 9:53 AM
5:59 PM - 8:29 PM

Minor Periods

12:28 AM - 1:58 PM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

Tuesday, July 21, 2026

Weather Forecast

Partly Cloudy
92.4°F
68.9°F
76°F
79%
0.32 in
78%
0%
8.9 mph
7.2


Air Quality

AQI: 1 - Good
PM2.5: 6.05 μg/m3
PM10: 6.38 μg/m3
Carbon Monoxide: 160.75 μg/m3
Nitrogen Dioxide: 5.75 μg/m3
Sulphur Dioxide: 1.15 μg/m3
Ozone: 88.17 μg/m3

Astronomical

Sunrise: 6:01 AM
Sun Transit: 1:15 PM
Sunset: 8:30 PM
Daylight: 14 hrs 30 mins
Moonrise: 2:01 PM
Moon Transit: 7:13 PM
Moonset: 12:53 AM
Moon Phase: First Quarter
Moon Illumination: 43.7%

Best Times for Fishing or Hunting

Major Periods

8:06 AM - 10:36 AM
6:43 PM - 9:13 PM

Minor Periods

1:31 PM - 3:01 PM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Wednesday, July 22, 2026

Weather Forecast

Sunny
85.5°F
66.9°F
75.9°F
66%
0.01 in
36%
0%
13.2 mph
6.3


Air Quality

AQI: 1 - Good
PM2.5: 4.5 μg/m3
PM10: 4.56 μg/m3
Carbon Monoxide: 178.49 μg/m3
Nitrogen Dioxide: 6.1 μg/m3
Sulphur Dioxide: 0.95 μg/m3
Ozone: 76.17 μg/m3

Astronomical

Sunrise: 6:01 AM
Sun Transit: 1:15 PM
Sunset: 8:29 PM
Daylight: 14 hrs 28 mins
Moonrise: 3:04 PM
Moon Transit: 8:00 PM
Moonset: 12:20 AM
Moon Phase: First Quarter
Moon Illumination: 55.0%

Best Times for Fishing or Hunting

Major Periods

8:51 AM - 11:21 AM
7:30 PM - 10:00 PM

Minor Periods

2:34 PM - 4:04 PM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Thursday, July 23, 2026

Weather Forecast

Sunny
81.8°F
59.5°F
70.8°F
56%
0 in
3%
0%
8.1 mph
7


Air Quality

AQI: 1 - Good
PM2.5: 4.61 μg/m3
PM10: 4.61 μg/m3
Carbon Monoxide: 260.44 μg/m3
Nitrogen Dioxide: 8.84 μg/m3
Sulphur Dioxide: 0.97 μg/m3
Ozone: 48.56 μg/m3

Astronomical

Sunrise: 6:02 AM
Sun Transit: 1:15 PM
Sunset: 8:29 PM
Daylight: 14 hrs 27 mins
Moonrise: 4:06 PM
Moon Transit: 8:47 PM
Moonset: 12:49 AM
Moon Phase: First Quarter
Moon Illumination: 66.1%

Best Times for Fishing or Hunting

Major Periods

9:38 AM - 12:08 AM
8:17 PM - 10:47 PM

Minor Periods

3:36 PM - 5:06 PM
12:19 AM - 1:49 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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