Water Temperature of Difficult Run in McLean, VA

Current Water Temperature

32.0°F

Measurement Time: Saturday, September 26, 2026, 8:16 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

61°F
Chance Light Rain
Chance Light Rain
87%
NW 10 mph
57°F

Weather Forecast

Chance Light Rain
Overnight
58°F - Chance Light Rain
Chance Light Rain
Sunday
65°F - Chance Light Rain
Slight Chance Light Rain then Cloudy
Sunday Night
59°F - Slight Chance Light Rain then Cloudy
Mostly Cloudy
Monday
70°F - Mostly Cloudy
Mostly Cloudy
Monday Night
61°F - Mostly Cloudy
Partly Sunny
Tuesday
74°F - Partly Sunny
Partly Cloudy
Tuesday Night
60°F - Partly Cloudy
Mostly Sunny
Wednesday
79°F - Mostly Sunny
Partly Cloudy
Wednesday Night
61°F - Partly Cloudy
Mostly Sunny
Thursday
81°F - Mostly Sunny
Partly Cloudy
Thursday Night
64°F - Partly Cloudy
Partly Sunny then Slight Chance Rain Showers
Friday
79°F - Partly Sunny then Slight Chance Rain Showers
Slight Chance Rain Showers
Friday Night
62°F - Slight Chance Rain Showers
Chance Rain Showers
Saturday
73°F - Chance Rain Showers

Astronomical

Sunrise: 7:01 AM
Sun Transit: 1:00 PM
Sunset: 6:58 PM
Daylight: 11 hrs 57 mins
Moonrise: 7:14 PM
Moon Transit: 1:18 AM
Moonset: 8:01 AM
Moon Phase: Full
Moon Illumination: 97.3%

Best Times for Fishing or Hunting

Major Periods

12:48 AM - 3:18 AM
2:57 PM - 5:27 PM

Minor Periods

6:44 PM - 8:14 PM
7:31 AM - 9:01 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: 7:01 AM
Sun Transit: 1:00 PM
Sunset: 6:58 PM
Daylight: 11 hrs 57 mins
Moonrise: 7:14 PM
Moon Transit: 1:18 AM
Moonset: 8:01 AM
Moon Phase: Full
Moon Illumination: 97.3%

Best Times for Fishing or Hunting

Major Periods

12:48 AM - 3:18 AM
2:57 PM - 5:27 PM

Minor Periods

6:44 PM - 8:14 PM
7:31 AM - 9:01 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: 7:01 AM
Sun Transit: 1:00 PM
Sunset: 6:58 PM
Daylight: 11 hrs 57 mins
Moonrise: 7:14 PM
Moon Transit: 1:18 AM
Moonset: 8:01 AM
Moon Phase: Full
Moon Illumination: 97.3%

Best Times for Fishing or Hunting

Major Periods

12:48 AM - 3:18 AM
2:57 PM - 5:27 PM

Minor Periods

6:44 PM - 8:14 PM
7:31 AM - 9:01 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: 7:01 AM
Sun Transit: 1:00 PM
Sunset: 6:58 PM
Daylight: 11 hrs 57 mins
Moonrise: 7:14 PM
Moon Transit: 1:18 AM
Moonset: 8:01 AM
Moon Phase: Full
Moon Illumination: 97.3%

Best Times for Fishing or Hunting

Major Periods

12:48 AM - 3:18 AM
2:57 PM - 5:27 PM

Minor Periods

6:44 PM - 8:14 PM
7:31 AM - 9:01 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: 7:02 AM
Sun Transit: 1:00 PM
Sunset: 6:56 PM
Daylight: 11 hrs 54 mins
Moonrise: 7:44 PM
Moon Transit: 2:07 AM
Moonset: 9:12 AM
Moon Phase: Full
Moon Illumination: 92.4%

Best Times for Fishing or Hunting

Major Periods

1:37 AM - 4:07 AM
3:48 PM - 6:18 PM

Minor Periods

7:14 PM - 8:44 PM
8:42 AM - 10:12 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: 7:02 AM
Sun Transit: 1:00 PM
Sunset: 6:56 PM
Daylight: 11 hrs 54 mins
Moonrise: 7:44 PM
Moon Transit: 2:07 AM
Moonset: 9:12 AM
Moon Phase: Full
Moon Illumination: 92.4%

Best Times for Fishing or Hunting

Major Periods

1:37 AM - 4:07 AM
3:48 PM - 6:18 PM

Minor Periods

7:14 PM - 8:44 PM
8:42 AM - 10:12 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: 7:03 AM
Sun Transit: 1:00 PM
Sunset: 6:55 PM
Daylight: 11 hrs 52 mins
Moonrise: 8:20 PM
Moon Transit: 2:58 AM
Moonset: 10:26 AM
Moon Phase: Waning Gibbous
Moon Illumination: 85.4%

Best Times for Fishing or Hunting

Major Periods

2:28 AM - 4:58 AM
4:42 PM - 7:12 PM

Minor Periods

7:50 PM - 9:20 PM
9:56 AM - 11:26 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: 7:03 AM
Sun Transit: 1:00 PM
Sunset: 6:55 PM
Daylight: 11 hrs 52 mins
Moonrise: 8:20 PM
Moon Transit: 2:58 AM
Moonset: 10:26 AM
Moon Phase: Waning Gibbous
Moon Illumination: 85.4%

Best Times for Fishing or Hunting

Major Periods

2:28 AM - 4:58 AM
4:42 PM - 7:12 PM

Minor Periods

7:50 PM - 9:20 PM
9:56 AM - 11:26 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: 7:04 AM
Sun Transit: 12:58 AM
Sunset: 6:53 PM
Daylight: 11 hrs 49 mins
Moonrise: 9:03 PM
Moon Transit: 3:55 AM
Moonset: 11:41 AM
Moon Phase: Waning Gibbous
Moon Illumination: 76.5%

Best Times for Fishing or Hunting

Major Periods

3:25 AM - 5:55 AM
5:41 PM - 8:11 PM

Minor Periods

8:33 PM - 10:03 PM
11:11 AM - 12:41 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: 7:04 AM
Sun Transit: 12:58 AM
Sunset: 6:53 PM
Daylight: 11 hrs 49 mins
Moonrise: 9:03 PM
Moon Transit: 3:55 AM
Moonset: 11:41 AM
Moon Phase: Waning Gibbous
Moon Illumination: 76.5%

Best Times for Fishing or Hunting

Major Periods

3:25 AM - 5:55 AM
5:41 PM - 8:11 PM

Minor Periods

8:33 PM - 10:03 PM
11:11 AM - 12:41 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: 7:05 AM
Sun Transit: 12:58 AM
Sunset: 6:52 PM
Daylight: 11 hrs 47 mins
Moonrise: 9:57 PM
Moon Transit: 4:55 AM
Moonset: 12:54 AM
Moon Phase: Waning Gibbous
Moon Illumination: 66.3%

Best Times for Fishing or Hunting

Major Periods

4:25 AM - 6:55 AM
6:42 PM - 9:12 PM

Minor Periods

9:27 PM - 10:57 PM
12:24 AM - 1:54 PM

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: 7:05 AM
Sun Transit: 12:58 AM
Sunset: 6:52 PM
Daylight: 11 hrs 47 mins
Moonrise: 9:57 PM
Moon Transit: 4:55 AM
Moonset: 12:54 AM
Moon Phase: Waning Gibbous
Moon Illumination: 66.3%

Best Times for Fishing or Hunting

Major Periods

4:25 AM - 6:55 AM
6:42 PM - 9:12 PM

Minor Periods

9:27 PM - 10:57 PM
12:24 AM - 1:54 PM

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: 7:06 AM
Sun Transit: 12:58 AM
Sunset: 6:50 PM
Daylight: 11 hrs 44 mins
Moonrise: 11:01 PM
Moon Transit: 5:57 AM
Moonset: 1:59 PM
Moon Phase: Last Quarter
Moon Illumination: 55.3%

Best Times for Fishing or Hunting

Major Periods

5:27 AM - 7:57 AM
7:45 PM - 10:15 PM

Minor Periods

12:00 AM - 12:00 AM
1:29 PM - 2:59 PM

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: 7:06 AM
Sun Transit: 12:58 AM
Sunset: 6:50 PM
Daylight: 11 hrs 44 mins
Moonrise: 11:01 PM
Moon Transit: 5:57 AM
Moonset: 1:59 PM
Moon Phase: Last Quarter
Moon Illumination: 55.3%

Best Times for Fishing or Hunting

Major Periods

5:27 AM - 7:57 AM
7:45 PM - 10:15 PM

Minor Periods

12:00 AM - 12:00 AM
1:29 PM - 2:59 PM

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: 7:07 AM
Sun Transit: 12:57 AM
Sunset: 6:49 PM
Daylight: 11 hrs 42 mins
Moonrise: 12:01 AM
Moon Transit: 7:00 AM
Moonset: 2:54 PM
Moon Phase: Last Quarter
Moon Illumination: 43.9%

Best Times for Fishing or Hunting

Major Periods

6:30 AM - 9:00 AM
8:47 PM - 11:17 PM

Minor Periods

2:24 PM - 3:54 PM
12:00 AM - 12:00 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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