Water Temperature of Difficult Run in McLean, VA

Current Water Temperature

64.2°F

Measurement Time: Tuesday, September 29, 2026, 11:15 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

62°F

Conditions: Partly Cloudy

Humidity: 93%

Wind: 0 mph

Dew Point: 60°F

Weather Forecast

Overnight
59°F - Patchy Fog

Wednesday
80°F - Patchy Fog then Partly Sunny

Wednesday Night
62°F - Mostly Cloudy

Thursday
84°F - Mostly Sunny

Thursday Night
64°F - Mostly Clear

Friday
86°F - Mostly Sunny then Chance Rain Showers

Friday Night
60°F - Chance Rain Showers

Saturday
68°F - Slight Chance Rain Showers

Saturday Night
55°F - Chance Rain Showers

Sunday
65°F - Chance Rain Showers

Sunday Night
54°F - Chance Rain Showers

Monday
66°F - Mostly Sunny

Monday Night
43°F - Mostly Clear

Tuesday
59°F - Sunny

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

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: 7:04 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

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: 7:04 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

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: 7:04 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

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: 7:05 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

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: 7:05 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

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: 7:06 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

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: 7:06 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

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: 7:07 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

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: 7:07 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

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: 7:08 AM
Sun Transit: 12:57 AM
Sunset: 6:47 PM
Daylight: 11 hrs 39 mins

Moonrise: 12:13 AM
Moon Transit: 8:00 AM
Moonset: 3:38 PM
Moon Phase: Last Quarter
Moon Illumination: 32.9%

Best Times for Fishing or Hunting

Major Periods

7:30 AM - 10:00 AM
12:00 AM - 12:00 AM

Minor Periods

3:08 PM - 4:38 PM
12:00 AM - 12:00 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: 7:08 AM
Sun Transit: 12:57 AM
Sunset: 6:47 PM
Daylight: 11 hrs 39 mins

Moonrise: 12:13 AM
Moon Transit: 8:00 AM
Moonset: 3:38 PM
Moon Phase: Last Quarter
Moon Illumination: 32.9%

Best Times for Fishing or Hunting

Major Periods

7:30 AM - 10:00 AM
12:00 AM - 12:00 AM

Minor Periods

3:08 PM - 4:38 PM
12:00 AM - 12:00 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: 7:09 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

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: 7:09 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

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

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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