Water Temperature of Difficult Run in McLean, VA

Current Water Temperature

60.8°F

Measurement Time: Tuesday, October 6, 2026, 1:15 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

45°F

Conditions: Sunny

Humidity: 79%

Wind: NW 5 mph

Dew Point: 39°F

Weather Forecast

Today
65°F - Sunny

Tonight
44°F - Clear

Wednesday
72°F - Sunny

Wednesday Night
52°F - Clear

Thursday
79°F - Sunny

Thursday Night
52°F - Mostly Clear

Friday
73°F - Mostly Sunny

Friday Night
50°F - Partly Cloudy

Saturday
72°F - Mostly Sunny

Saturday Night
54°F - Partly Cloudy

Sunday
70°F - Chance Rain Showers

Sunday Night
57°F - Chance Rain Showers

Columbus Day
72°F - Chance Rain Showers

Monday Night
57°F - Slight Chance Rain Showers then Mostly Cloudy

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

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

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

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

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

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

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

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

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

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

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

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

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

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

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

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

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

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

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

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

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

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

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

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

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

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

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: 7:15 AM
Sun Transit: 12:55 AM
Sunset: 6:35 PM
Daylight: 11 hrs 20 mins

Moonrise: 9:24 AM
Moon Transit: 2:24 PM
Moonset: 7:18 PM
Moon Phase: New
Moon Illumination: 0.8%

Best Times for Fishing or Hunting

Major Periods

3:16 AM - 5:46 AM
1:54 PM - 4:24 PM

Minor Periods

6:48 PM - 8:18 PM
8:54 AM - 10:24 AM

Action Rating: 4 out of 5

Wednesday, December 31, 1969

Weather Forecast

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

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: 7:15 AM
Sun Transit: 12:55 AM
Sunset: 6:35 PM
Daylight: 11 hrs 20 mins

Moonrise: 9:24 AM
Moon Transit: 2:24 PM
Moonset: 7:18 PM
Moon Phase: New
Moon Illumination: 0.8%

Best Times for Fishing or Hunting

Major Periods

3:16 AM - 5:46 AM
1:54 PM - 4:24 PM

Minor Periods

6:48 PM - 8:18 PM
8:54 AM - 10:24 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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