Water Temperature of Difficult Run in McLean, VA

Current Water Temperature

75.7°F

Measurement Time: Saturday, September 5, 2026, 10:15 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

79°F
Isolated Showers And Thunderstorms
Isolated Showers And Thunderstorms
72%
N 5 mph
69°F

Weather Forecast

Isolated Showers And Thunderstorms
This Afternoon
82°F - Isolated Showers And Thunderstorms
Partly Cloudy
Tonight
64°F - Partly Cloudy
Mostly Sunny
Sunday
83°F - Mostly Sunny
Partly Cloudy
Sunday Night
62°F - Partly Cloudy
Mostly Sunny
Labor Day
83°F - Mostly Sunny
Mostly Clear
Monday Night
61°F - Mostly Clear
Mostly Sunny
Tuesday
85°F - Mostly Sunny
Partly Cloudy
Tuesday Night
64°F - Partly Cloudy
Mostly Sunny
Wednesday
88°F - Mostly Sunny
Mostly Clear
Wednesday Night
72°F - Mostly Clear
Mostly Sunny then Slight Chance Showers And Thunderstorms
Thursday
89°F - Mostly Sunny then Slight Chance Showers And Thunderstorms
Chance Showers And Thunderstorms
Thursday Night
66°F - Chance Showers And Thunderstorms
Slight Chance Rain Showers then Mostly Sunny
Friday
81°F - Slight Chance Rain Showers then Mostly Sunny
Mostly Clear
Friday Night
61°F - Mostly Clear

Astronomical

Sunrise: 6:42 AM
Sun Transit: 1:07 PM
Sunset: 7:33 PM
Daylight: 12 hrs 51 mins
Moonrise: 12:02 AM
Moon Transit: 8:03 AM
Moonset: 4:04 PM
Moon Phase: Last Quarter
Moon Illumination: 27.4%

Best Times for Fishing or Hunting

Major Periods

7:33 AM - 10:03 AM
12:00 AM - 12:00 AM

Minor Periods

3:34 PM - 5:04 PM
12:00 AM - 12:00 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: 6:42 AM
Sun Transit: 1:07 PM
Sunset: 7:33 PM
Daylight: 12 hrs 51 mins
Moonrise: 12:02 AM
Moon Transit: 8:03 AM
Moonset: 4:04 PM
Moon Phase: Last Quarter
Moon Illumination: 27.4%

Best Times for Fishing or Hunting

Major Periods

7:33 AM - 10:03 AM
12:00 AM - 12:00 AM

Minor Periods

3:34 PM - 5:04 PM
12:00 AM - 12:00 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: 6:42 AM
Sun Transit: 1:07 PM
Sunset: 7:33 PM
Daylight: 12 hrs 51 mins
Moonrise: 12:02 AM
Moon Transit: 8:03 AM
Moonset: 4:04 PM
Moon Phase: Last Quarter
Moon Illumination: 27.4%

Best Times for Fishing or Hunting

Major Periods

7:33 AM - 10:03 AM
12:00 AM - 12:00 AM

Minor Periods

3:34 PM - 5:04 PM
12:00 AM - 12:00 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: 6:43 AM
Sun Transit: 1:07 PM
Sunset: 7:31 PM
Daylight: 12 hrs 49 mins
Moonrise: 1:09 AM
Moon Transit: 9:06 AM
Moonset: 4:57 PM
Moon Phase: Last Quarter
Moon Illumination: 18.0%

Best Times for Fishing or Hunting

Major Periods

8:36 AM - 11:06 AM
12:00 AM - 12:00 AM

Minor Periods

4:27 PM - 5:57 PM
12:39 AM - 2:09 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: 6:43 AM
Sun Transit: 1:07 PM
Sunset: 7:31 PM
Daylight: 12 hrs 49 mins
Moonrise: 1:09 AM
Moon Transit: 9:06 AM
Moonset: 4:57 PM
Moon Phase: Last Quarter
Moon Illumination: 18.0%

Best Times for Fishing or Hunting

Major Periods

8:36 AM - 11:06 AM
12:00 AM - 12:00 AM

Minor Periods

4:27 PM - 5:57 PM
12:39 AM - 2:09 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: 6:44 AM
Sun Transit: 1:06 PM
Sunset: 7:30 PM
Daylight: 12 hrs 46 mins
Moonrise: 2:23 AM
Moon Transit: 10:06 AM
Moonset: 5:39 PM
Moon Phase: Waning Crescent
Moon Illumination: 10.1%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
9:36 AM - 12:06 AM

Minor Periods

5:09 PM - 6:39 PM
1:53 AM - 3:23 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: 6:44 AM
Sun Transit: 1:06 PM
Sunset: 7:30 PM
Daylight: 12 hrs 46 mins
Moonrise: 2:23 AM
Moon Transit: 10:06 AM
Moonset: 5:39 PM
Moon Phase: Waning Crescent
Moon Illumination: 10.1%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
9:36 AM - 12:06 AM

Minor Periods

5:09 PM - 6:39 PM
1:53 AM - 3:23 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: 6:44 AM
Sun Transit: 1:06 PM
Sunset: 7:28 PM
Daylight: 12 hrs 44 mins
Moonrise: 3:39 AM
Moon Transit: 11:02 AM
Moonset: 6:14 PM
Moon Phase: Waning Crescent
Moon Illumination: 4.4%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
10:32 AM - 1:02 PM

Minor Periods

5:44 PM - 7:14 PM
3:09 AM - 4:39 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: 6:44 AM
Sun Transit: 1:06 PM
Sunset: 7:28 PM
Daylight: 12 hrs 44 mins
Moonrise: 3:39 AM
Moon Transit: 11:02 AM
Moonset: 6:14 PM
Moon Phase: Waning Crescent
Moon Illumination: 4.4%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
10:32 AM - 1:02 PM

Minor Periods

5:44 PM - 7:14 PM
3:09 AM - 4:39 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: 6:45 AM
Sun Transit: 1:06 PM
Sunset: 7:27 PM
Daylight: 12 hrs 41 mins
Moonrise: 4:54 AM
Moon Transit: 11:54 AM
Moonset: 6:43 PM
Moon Phase: Waning Crescent
Moon Illumination: 0.9%

Best Times for Fishing or Hunting

Major Periods

12:44 AM - 3:14 AM
11:24 AM - 1:54 PM

Minor Periods

6:13 PM - 7:43 PM
4:24 AM - 5:54 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: 6:45 AM
Sun Transit: 1:06 PM
Sunset: 7:27 PM
Daylight: 12 hrs 41 mins
Moonrise: 4:54 AM
Moon Transit: 11:54 AM
Moonset: 6:43 PM
Moon Phase: Waning Crescent
Moon Illumination: 0.9%

Best Times for Fishing or Hunting

Major Periods

12:44 AM - 3:14 AM
11:24 AM - 1:54 PM

Minor Periods

6:13 PM - 7:43 PM
4:24 AM - 5:54 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: 6:46 AM
Sun Transit: 1:05 PM
Sunset: 7:25 PM
Daylight: 12 hrs 39 mins
Moonrise: 6:06 AM
Moon Transit: 12:42 AM
Moonset: 7:08 PM
Moon Phase: New
Moon Illumination: 0.0%

Best Times for Fishing or Hunting

Major Periods

1:34 AM - 4:04 AM
12:12 AM - 2:42 PM

Minor Periods

6:38 PM - 8:08 PM
5:36 AM - 7:06 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: 6:46 AM
Sun Transit: 1:05 PM
Sunset: 7:25 PM
Daylight: 12 hrs 39 mins
Moonrise: 6:06 AM
Moon Transit: 12:42 AM
Moonset: 7:08 PM
Moon Phase: New
Moon Illumination: 0.0%

Best Times for Fishing or Hunting

Major Periods

1:34 AM - 4:04 AM
12:12 AM - 2:42 PM

Minor Periods

6:38 PM - 8:08 PM
5:36 AM - 7:06 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: 6:47 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

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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