Water Temperature of Difficult Run in McLean, VA

Current Water Temperature

65.1°F

Measurement Time: Monday, October 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

70°F
Mostly Sunny
Mostly Sunny
53%
NW 12 mph
52°F

Weather Forecast

Mostly Sunny
This Afternoon
72°F - Mostly Sunny
Mostly Clear
Tonight
44°F - Mostly Clear
Sunny
Tuesday
65°F - Sunny
Clear
Tuesday Night
41°F - Clear
Sunny
Wednesday
72°F - Sunny
Mostly Clear
Wednesday Night
53°F - Mostly Clear
Sunny
Thursday
79°F - Sunny
Mostly Clear
Thursday Night
53°F - Mostly Clear
Sunny
Friday
74°F - Sunny
Mostly Clear
Friday Night
53°F - Mostly Clear
Mostly Sunny
Saturday
71°F - Mostly Sunny
Partly Cloudy
Saturday Night
52°F - Partly Cloudy
Partly Sunny then Slight Chance Rain Showers
Sunday
69°F - Partly Sunny then Slight Chance Rain Showers
Chance Rain Showers
Sunday Night
56°F - Chance Rain Showers

Astronomical

Sunrise: 7:09 AM
Sun Transit: 12:57 AM
Sunset: 6:45 PM
Daylight: 11 hrs 37 mins
Moonrise: 1:26 AM
Moon Transit: 8:56 AM
Moonset: 4:14 PM
Moon Phase: Last Quarter
Moon Illumination: 22.8%

Best Times for Fishing or Hunting

Major Periods

8:26 AM - 10:56 AM
12:00 AM - 12:00 AM

Minor Periods

3:44 PM - 5:14 PM
12:56 AM - 2:26 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: 7:09 AM
Sun Transit: 12:57 AM
Sunset: 6:45 PM
Daylight: 11 hrs 37 mins
Moonrise: 1:26 AM
Moon Transit: 8:56 AM
Moonset: 4:14 PM
Moon Phase: Last Quarter
Moon Illumination: 22.8%

Best Times for Fishing or Hunting

Major Periods

8:26 AM - 10:56 AM
12:00 AM - 12:00 AM

Minor Periods

3:44 PM - 5:14 PM
12:56 AM - 2:26 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: 7:09 AM
Sun Transit: 12:57 AM
Sunset: 6:45 PM
Daylight: 11 hrs 37 mins
Moonrise: 1:26 AM
Moon Transit: 8:56 AM
Moonset: 4:14 PM
Moon Phase: Last Quarter
Moon Illumination: 22.8%

Best Times for Fishing or Hunting

Major Periods

8:26 AM - 10:56 AM
12:00 AM - 12:00 AM

Minor Periods

3:44 PM - 5:14 PM
12:56 AM - 2:26 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: 7:10 AM
Sun Transit: 12:57 AM
Sunset: 6:44 PM
Daylight: 11 hrs 34 mins
Moonrise: 2:40 AM
Moon Transit: 9:48 AM
Moonset: 4:44 PM
Moon Phase: Waning Crescent
Moon Illumination: 14.1%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
9:18 AM - 11:48 AM

Minor Periods

4:14 PM - 5:44 PM
2:10 AM - 3:40 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: 7:10 AM
Sun Transit: 12:57 AM
Sunset: 6:44 PM
Daylight: 11 hrs 34 mins
Moonrise: 2:40 AM
Moon Transit: 9:48 AM
Moonset: 4:44 PM
Moon Phase: Waning Crescent
Moon Illumination: 14.1%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
9:18 AM - 11:48 AM

Minor Periods

4:14 PM - 5:44 PM
2:10 AM - 3:40 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: 7:11 AM
Sun Transit: 12:56 AM
Sunset: 6:42 PM
Daylight: 11 hrs 32 mins
Moonrise: 3:51 AM
Moon Transit: 10:36 AM
Moonset: 5:10 PM
Moon Phase: Waning Crescent
Moon Illumination: 7.2%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
10:06 AM - 12:36 AM

Minor Periods

4:40 PM - 6:10 PM
3:21 AM - 4:51 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: 7:11 AM
Sun Transit: 12:56 AM
Sunset: 6:42 PM
Daylight: 11 hrs 32 mins
Moonrise: 3:51 AM
Moon Transit: 10:36 AM
Moonset: 5:10 PM
Moon Phase: Waning Crescent
Moon Illumination: 7.2%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
10:06 AM - 12:36 AM

Minor Periods

4:40 PM - 6:10 PM
3:21 AM - 4:51 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: 7:12 AM
Sun Transit: 12:56 AM
Sunset: 6:41 PM
Daylight: 11 hrs 29 mins
Moonrise: 5:00 AM
Moon Transit: 11:22 AM
Moonset: 5:34 PM
Moon Phase: Waning Crescent
Moon Illumination: 2.5%

Best Times for Fishing or Hunting

Major Periods

12:14 AM - 2:44 AM
10:52 AM - 1:22 PM

Minor Periods

5:04 PM - 6:34 PM
4:30 AM - 6:00 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: 7:12 AM
Sun Transit: 12:56 AM
Sunset: 6:41 PM
Daylight: 11 hrs 29 mins
Moonrise: 5:00 AM
Moon Transit: 11:22 AM
Moonset: 5:34 PM
Moon Phase: Waning Crescent
Moon Illumination: 2.5%

Best Times for Fishing or Hunting

Major Periods

12:14 AM - 2:44 AM
10:52 AM - 1:22 PM

Minor Periods

5:04 PM - 6:34 PM
4:30 AM - 6:00 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: 7:12 AM
Sun Transit: 12:56 AM
Sunset: 6:39 PM
Daylight: 11 hrs 27 mins
Moonrise: 6:07 AM
Moon Transit: 12:07 AM
Moonset: 5:58 PM
Moon Phase: Waning Crescent
Moon Illumination: 0.2%

Best Times for Fishing or Hunting

Major Periods

1:00 AM - 3:30 AM
11:37 AM - 2:07 PM

Minor Periods

5:28 PM - 6:58 PM
5:37 AM - 7:07 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: 7:12 AM
Sun Transit: 12:56 AM
Sunset: 6:39 PM
Daylight: 11 hrs 27 mins
Moonrise: 6:07 AM
Moon Transit: 12:07 AM
Moonset: 5:58 PM
Moon Phase: Waning Crescent
Moon Illumination: 0.2%

Best Times for Fishing or Hunting

Major Periods

1:00 AM - 3:30 AM
11:37 AM - 2:07 PM

Minor Periods

5:28 PM - 6:58 PM
5:37 AM - 7:07 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: 7:13 AM
Sun Transit: 12:55 AM
Sunset: 6:38 PM
Daylight: 11 hrs 24 mins
Moonrise: 7:12 AM
Moon Transit: 12:51 AM
Moonset: 6:22 PM
Moon Phase: New
Moon Illumination: 0.5%

Best Times for Fishing or Hunting

Major Periods

1:44 AM - 4:14 AM
12:21 AM - 2:51 PM

Minor Periods

5:52 PM - 7:22 PM
6:42 AM - 8:12 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: 7:13 AM
Sun Transit: 12:55 AM
Sunset: 6:38 PM
Daylight: 11 hrs 24 mins
Moonrise: 7:12 AM
Moon Transit: 12:51 AM
Moonset: 6:22 PM
Moon Phase: New
Moon Illumination: 0.5%

Best Times for Fishing or Hunting

Major Periods

1:44 AM - 4:14 AM
12:21 AM - 2:51 PM

Minor Periods

5:52 PM - 7:22 PM
6:42 AM - 8:12 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: 7:14 AM
Sun Transit: 12:55 AM
Sunset: 6:36 PM
Daylight: 11 hrs 22 mins
Moonrise: 8:19 AM
Moon Transit: 1:37 PM
Moonset: 6:49 PM
Moon Phase: New
Moon Illumination: 3.3%

Best Times for Fishing or Hunting

Major Periods

2:30 AM - 5:00 AM
1:07 PM - 3:37 PM

Minor Periods

6:19 PM - 7:49 PM
7:49 AM - 9:19 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: 7:14 AM
Sun Transit: 12:55 AM
Sunset: 6:36 PM
Daylight: 11 hrs 22 mins
Moonrise: 8:19 AM
Moon Transit: 1:37 PM
Moonset: 6:49 PM
Moon Phase: New
Moon Illumination: 3.3%

Best Times for Fishing or Hunting

Major Periods

2:30 AM - 5:00 AM
1:07 PM - 3:37 PM

Minor Periods

6:19 PM - 7:49 PM
7:49 AM - 9:19 AM

Action Rating: 4 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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