Water Temperature of Difficult Run in McLean, VA

Current Water Temperature

73.4°F

Measurement Time: Friday, September 11, 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

80°F
Mostly Cloudy
Mostly Cloudy
60%
NE 3 mph
65°F

Weather Forecast

Mostly Cloudy
This Afternoon
81°F - Mostly Cloudy
Mostly Cloudy
Tonight
68°F - Mostly Cloudy
Mostly Cloudy then Chance Showers And Thunderstorms
Saturday
83°F - Mostly Cloudy then Chance Showers And Thunderstorms
Chance Showers And Thunderstorms then Showers And Thunderstorms
Saturday Night
70°F - Chance Showers And Thunderstorms then Showers And Thunderstorms
Chance Showers And Thunderstorms
Sunday
85°F - Chance Showers And Thunderstorms
Partly Cloudy
Sunday Night
68°F - Partly Cloudy
Mostly Sunny
Monday
80°F - Mostly Sunny
Mostly Clear
Monday Night
56°F - Mostly Clear
Sunny
Tuesday
77°F - Sunny
Mostly Clear
Tuesday Night
60°F - Mostly Clear
Sunny
Wednesday
82°F - Sunny
Mostly Clear
Wednesday Night
63°F - Mostly Clear
Mostly Sunny then Chance Rain Showers
Thursday
87°F - Mostly Sunny then Chance Rain Showers
Chance Rain Showers
Thursday Night
65°F - Chance Rain Showers

Astronomical

Sunrise: 6:47 AM
Sun Transit: 1:05 PM
Sunset: 7:23 PM
Daylight: 12 hrs 36 mins
Moonrise: 7:15 AM
Moon Transit: 1:29 PM
Moonset: 7:32 PM
Moon Phase: New
Moon Illumination: 1.7%

Best Times for Fishing or Hunting

Major Periods

2:21 AM - 4:51 AM
12:59 AM - 3:29 PM

Minor Periods

7:02 PM - 8:32 PM
6:45 AM - 8:15 AM

Action Rating: 5 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 6:47 AM
Sun Transit: 1:05 PM
Sunset: 7:23 PM
Daylight: 12 hrs 36 mins
Moonrise: 7:15 AM
Moon Transit: 1:29 PM
Moonset: 7:32 PM
Moon Phase: New
Moon Illumination: 1.7%

Best Times for Fishing or Hunting

Major Periods

2:21 AM - 4:51 AM
12:59 AM - 3:29 PM

Minor Periods

7:02 PM - 8:32 PM
6:45 AM - 8:15 AM

Action Rating: 5 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 6:47 AM
Sun Transit: 1:05 PM
Sunset: 7:23 PM
Daylight: 12 hrs 36 mins
Moonrise: 7:15 AM
Moon Transit: 1:29 PM
Moonset: 7:32 PM
Moon Phase: New
Moon Illumination: 1.7%

Best Times for Fishing or Hunting

Major Periods

2:21 AM - 4:51 AM
12:59 AM - 3:29 PM

Minor Periods

7:02 PM - 8:32 PM
6:45 AM - 8:15 AM

Action Rating: 5 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 6:48 AM
Sun Transit: 1:05 PM
Sunset: 7:22 PM
Daylight: 12 hrs 34 mins
Moonrise: 8:23 AM
Moon Transit: 2:14 PM
Moonset: 7:56 PM
Moon Phase: New
Moon Illumination: 0.1%

Best Times for Fishing or Hunting

Major Periods

3:06 AM - 5:36 AM
1:44 PM - 4:14 PM

Minor Periods

7:26 PM - 8:56 PM
7:53 AM - 9:23 AM

Action Rating: 4 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 6:48 AM
Sun Transit: 1:05 PM
Sunset: 7:22 PM
Daylight: 12 hrs 34 mins
Moonrise: 8:23 AM
Moon Transit: 2:14 PM
Moonset: 7:56 PM
Moon Phase: New
Moon Illumination: 0.1%

Best Times for Fishing or Hunting

Major Periods

3:06 AM - 5:36 AM
1:44 PM - 4:14 PM

Minor Periods

7:26 PM - 8:56 PM
7:53 AM - 9:23 AM

Action Rating: 4 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 6:49 AM
Sun Transit: 1:04 PM
Sunset: 7:20 PM
Daylight: 12 hrs 31 mins
Moonrise: 9:29 AM
Moon Transit: 3:00 PM
Moonset: 8:21 PM
Moon Phase: New
Moon Illumination: 2.2%

Best Times for Fishing or Hunting

Major Periods

3:51 AM - 6:21 AM
2:30 PM - 5:00 PM

Minor Periods

7:51 PM - 9:21 PM
8:59 AM - 10:29 AM

Action Rating: 4 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 6:49 AM
Sun Transit: 1:04 PM
Sunset: 7:20 PM
Daylight: 12 hrs 31 mins
Moonrise: 9:29 AM
Moon Transit: 3:00 PM
Moonset: 8:21 PM
Moon Phase: New
Moon Illumination: 2.2%

Best Times for Fishing or Hunting

Major Periods

3:51 AM - 6:21 AM
2:30 PM - 5:00 PM

Minor Periods

7:51 PM - 9:21 PM
8:59 AM - 10:29 AM

Action Rating: 4 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 6:50 AM
Sun Transit: 1:04 PM
Sunset: 7:19 PM
Daylight: 12 hrs 29 mins
Moonrise: 10:35 AM
Moon Transit: 3:45 PM
Moonset: 8:48 PM
Moon Phase: Waxing Crescent
Moon Illumination: 6.7%

Best Times for Fishing or Hunting

Major Periods

4:37 AM - 7:07 AM
3:15 PM - 5:45 PM

Minor Periods

8:18 PM - 9:48 PM
10:05 AM - 11:35 AM

Action Rating: 3 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 6:50 AM
Sun Transit: 1:04 PM
Sunset: 7:19 PM
Daylight: 12 hrs 29 mins
Moonrise: 10:35 AM
Moon Transit: 3:45 PM
Moonset: 8:48 PM
Moon Phase: Waxing Crescent
Moon Illumination: 6.7%

Best Times for Fishing or Hunting

Major Periods

4:37 AM - 7:07 AM
3:15 PM - 5:45 PM

Minor Periods

8:18 PM - 9:48 PM
10:05 AM - 11:35 AM

Action Rating: 3 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 6:51 AM
Sun Transit: 1:04 PM
Sunset: 7:17 PM
Daylight: 12 hrs 26 mins
Moonrise: 11:40 AM
Moon Transit: 4:32 PM
Moonset: 9:19 PM
Moon Phase: Waxing Crescent
Moon Illumination: 13.4%

Best Times for Fishing or Hunting

Major Periods

5:24 AM - 7:54 AM
4:02 PM - 6:32 PM

Minor Periods

8:49 PM - 10:19 PM
11:10 AM - 12:40 AM

Action Rating: 2 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 6:51 AM
Sun Transit: 1:04 PM
Sunset: 7:17 PM
Daylight: 12 hrs 26 mins
Moonrise: 11:40 AM
Moon Transit: 4:32 PM
Moonset: 9:19 PM
Moon Phase: Waxing Crescent
Moon Illumination: 13.4%

Best Times for Fishing or Hunting

Major Periods

5:24 AM - 7:54 AM
4:02 PM - 6:32 PM

Minor Periods

8:49 PM - 10:19 PM
11:10 AM - 12:40 AM

Action Rating: 2 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 6:51 AM
Sun Transit: 1:03 PM
Sunset: 7:15 PM
Daylight: 12 hrs 24 mins
Moonrise: 12:44 AM
Moon Transit: 5:22 PM
Moonset: 9:57 PM
Moon Phase: Waxing Crescent
Moon Illumination: 22.0%

Best Times for Fishing or Hunting

Major Periods

6:12 AM - 8:42 AM
4:52 PM - 7:22 PM

Minor Periods

9:27 PM - 10:57 PM
12:14 AM - 1:44 PM

Action Rating: 3 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 6:51 AM
Sun Transit: 1:03 PM
Sunset: 7:15 PM
Daylight: 12 hrs 24 mins
Moonrise: 12:44 AM
Moon Transit: 5:22 PM
Moonset: 9:57 PM
Moon Phase: Waxing Crescent
Moon Illumination: 22.0%

Best Times for Fishing or Hunting

Major Periods

6:12 AM - 8:42 AM
4:52 PM - 7:22 PM

Minor Periods

9:27 PM - 10:57 PM
12:14 AM - 1:44 PM

Action Rating: 3 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 6:52 AM
Sun Transit: 1:03 PM
Sunset: 7:14 PM
Daylight: 12 hrs 21 mins
Moonrise: 1:43 PM
Moon Transit: 6:12 PM
Moonset: 10:41 PM
Moon Phase: Waxing Crescent
Moon Illumination: 32.1%

Best Times for Fishing or Hunting

Major Periods

7:02 AM - 9:32 AM
5:42 PM - 8:12 PM

Minor Periods

10:11 PM - 11:41 PM
1:13 PM - 2:43 PM

Action Rating: 3 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 6:52 AM
Sun Transit: 1:03 PM
Sunset: 7:14 PM
Daylight: 12 hrs 21 mins
Moonrise: 1:43 PM
Moon Transit: 6:12 PM
Moonset: 10:41 PM
Moon Phase: Waxing Crescent
Moon Illumination: 32.1%

Best Times for Fishing or Hunting

Major Periods

7:02 AM - 9:32 AM
5:42 PM - 8:12 PM

Minor Periods

10:11 PM - 11:41 PM
1:13 PM - 2:43 PM

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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