Water Temperature of Difficult Run in McLean, VA

Current Water Temperature

75.9°F

Measurement Time: Thursday, August 27, 2026, 11:15 AM EDT

Temperature Locations

View Nearby Locations     View All Virginia Locations     View Locations Near Me

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

87°F
Slight Chance Showers And Thunderstorms
Slight Chance Showers And Thunderstorms
57%
S 8 mph
70°F

Weather Forecast

Chance Showers And Thunderstorms
This Afternoon
88°F - Chance Showers And Thunderstorms
Chance Showers And Thunderstorms
Tonight
69°F - Chance Showers And Thunderstorms
Patchy Fog then Slight Chance Showers And Thunderstorms
Friday
86°F - Patchy Fog then Slight Chance Showers And Thunderstorms
Slight Chance Showers And Thunderstorms then Mostly Cloudy
Friday Night
68°F - Slight Chance Showers And Thunderstorms then Mostly Cloudy
Mostly Sunny
Saturday
87°F - Mostly Sunny
Mostly Clear then Patchy Fog
Saturday Night
69°F - Mostly Clear then Patchy Fog
Patchy Fog then Sunny
Sunday
89°F - Patchy Fog then Sunny
Partly Cloudy
Sunday Night
72°F - Partly Cloudy
Mostly Sunny
Monday
91°F - Mostly Sunny
Partly Cloudy
Monday Night
74°F - Partly Cloudy
Mostly Sunny then Slight Chance Showers And Thunderstorms
Tuesday
93°F - Mostly Sunny then Slight Chance Showers And Thunderstorms
Slight Chance Showers And Thunderstorms
Tuesday Night
75°F - Slight Chance Showers And Thunderstorms
Mostly Sunny then Slight Chance Showers And Thunderstorms
Wednesday
93°F - Mostly Sunny then Slight Chance Showers And Thunderstorms
Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms
Wednesday Night
74°F - Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms

Astronomical

Sunrise: 6:34 AM
Sun Transit: 1:10 PM
Sunset: 7:47 PM
Daylight: 13 hrs 13 mins
Moonrise: 7:36 PM
Moon Transit: 12:26 AM
Moonset: 5:51 AM
Moon Phase: Full
Moon Illumination: 100.0%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
2:04 PM - 4:34 PM

Minor Periods

7:06 PM - 8:36 PM
5:21 AM - 6:51 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: 6:34 AM
Sun Transit: 1:10 PM
Sunset: 7:47 PM
Daylight: 13 hrs 13 mins
Moonrise: 7:36 PM
Moon Transit: 12:26 AM
Moonset: 5:51 AM
Moon Phase: Full
Moon Illumination: 100.0%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
2:04 PM - 4:34 PM

Minor Periods

7:06 PM - 8:36 PM
5:21 AM - 6:51 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: 6:34 AM
Sun Transit: 1:10 PM
Sunset: 7:47 PM
Daylight: 13 hrs 13 mins
Moonrise: 7:36 PM
Moon Transit: 12:26 AM
Moonset: 5:51 AM
Moon Phase: Full
Moon Illumination: 100.0%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
2:04 PM - 4:34 PM

Minor Periods

7:06 PM - 8:36 PM
5:21 AM - 6:51 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: 6:35 AM
Sun Transit: 1:10 PM
Sunset: 7:45 PM
Daylight: 13 hrs 11 mins
Moonrise: 7:59 PM
Moon Transit: 1:11 AM
Moonset: 6:55 AM
Moon Phase: Full
Moon Illumination: 98.7%

Best Times for Fishing or Hunting

Major Periods

12:41 AM - 3:11 AM
2:48 PM - 5:18 PM

Minor Periods

7:29 PM - 8:59 PM
6:25 AM - 7:55 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: 6:35 AM
Sun Transit: 1:10 PM
Sunset: 7:45 PM
Daylight: 13 hrs 11 mins
Moonrise: 7:59 PM
Moon Transit: 1:11 AM
Moonset: 6:55 AM
Moon Phase: Full
Moon Illumination: 98.7%

Best Times for Fishing or Hunting

Major Periods

12:41 AM - 3:11 AM
2:48 PM - 5:18 PM

Minor Periods

7:29 PM - 8:59 PM
6:25 AM - 7:55 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: 6:35 AM
Sun Transit: 1:09 PM
Sunset: 7:44 PM
Daylight: 13 hrs 8 mins
Moonrise: 8:22 PM
Moon Transit: 1:54 AM
Moonset: 8:00 AM
Moon Phase: Full
Moon Illumination: 95.0%

Best Times for Fishing or Hunting

Major Periods

1:24 AM - 3:54 AM
12:00 AM - 12:00 AM

Minor Periods

7:52 PM - 9:22 PM
7:30 AM - 9:00 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: 6:35 AM
Sun Transit: 1:09 PM
Sunset: 7:44 PM
Daylight: 13 hrs 8 mins
Moonrise: 8:22 PM
Moon Transit: 1:54 AM
Moonset: 8:00 AM
Moon Phase: Full
Moon Illumination: 95.0%

Best Times for Fishing or Hunting

Major Periods

1:24 AM - 3:54 AM
12:00 AM - 12:00 AM

Minor Periods

7:52 PM - 9:22 PM
7:30 AM - 9:00 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: 6:36 AM
Sun Transit: 1:09 PM
Sunset: 7:42 PM
Daylight: 13 hrs 6 mins
Moonrise: 8:46 PM
Moon Transit: 12:49 AM
Moonset: 9:06 AM
Moon Phase: Waning Gibbous
Moon Illumination: 88.9%

Best Times for Fishing or Hunting

Major Periods

12:19 AM - 2:49 AM
12:19 AM - 2:49 AM

Minor Periods

8:16 PM - 9:46 PM
8:36 AM - 10:06 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: 6:36 AM
Sun Transit: 1:09 PM
Sunset: 7:42 PM
Daylight: 13 hrs 6 mins
Moonrise: 8:46 PM
Moon Transit: 12:49 AM
Moonset: 9:06 AM
Moon Phase: Waning Gibbous
Moon Illumination: 88.9%

Best Times for Fishing or Hunting

Major Periods

12:19 AM - 2:49 AM
12:19 AM - 2:49 AM

Minor Periods

8:16 PM - 9:46 PM
8:36 AM - 10:06 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: 6:37 AM
Sun Transit: 1:09 PM
Sunset: 7:41 PM
Daylight: 13 hrs 3 mins
Moonrise: 9:12 PM
Moon Transit: 3:24 AM
Moonset: 10:15 AM
Moon Phase: Waning Gibbous
Moon Illumination: 80.9%

Best Times for Fishing or Hunting

Major Periods

2:54 AM - 5:24 AM
5:03 PM - 7:33 PM

Minor Periods

8:42 PM - 10:12 PM
9:45 AM - 11:15 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: 6:37 AM
Sun Transit: 1:09 PM
Sunset: 7:41 PM
Daylight: 13 hrs 3 mins
Moonrise: 9:12 PM
Moon Transit: 3:24 AM
Moonset: 10:15 AM
Moon Phase: Waning Gibbous
Moon Illumination: 80.9%

Best Times for Fishing or Hunting

Major Periods

2:54 AM - 5:24 AM
5:03 PM - 7:33 PM

Minor Periods

8:42 PM - 10:12 PM
9:45 AM - 11:15 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: 6:38 AM
Sun Transit: 1:08 PM
Sunset: 7:39 PM
Daylight: 13 hrs 1 mins
Moonrise: 9:42 PM
Moon Transit: 4:12 AM
Moonset: 11:25 AM
Moon Phase: Waning Gibbous
Moon Illumination: 71.2%

Best Times for Fishing or Hunting

Major Periods

3:42 AM - 6:12 AM
5:53 PM - 8:23 PM

Minor Periods

9:12 PM - 10:42 PM
10:55 AM - 12:25 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: 6:38 AM
Sun Transit: 1:08 PM
Sunset: 7:39 PM
Daylight: 13 hrs 1 mins
Moonrise: 9:42 PM
Moon Transit: 4:12 AM
Moonset: 11:25 AM
Moon Phase: Waning Gibbous
Moon Illumination: 71.2%

Best Times for Fishing or Hunting

Major Periods

3:42 AM - 6:12 AM
5:53 PM - 8:23 PM

Minor Periods

9:12 PM - 10:42 PM
10:55 AM - 12:25 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: 6:39 AM
Sun Transit: 1:08 PM
Sunset: 7:38 PM
Daylight: 12 hrs 58 mins
Moonrise: 10:19 PM
Moon Transit: 5:04 AM
Moonset: 12:38 AM
Moon Phase: Waning Gibbous
Moon Illumination: 60.5%

Best Times for Fishing or Hunting

Major Periods

4:34 AM - 7:04 AM
6:47 PM - 9:17 PM

Minor Periods

9:49 PM - 11:19 PM
12:08 AM - 1:38 PM

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: 6:39 AM
Sun Transit: 1:08 PM
Sunset: 7:38 PM
Daylight: 12 hrs 58 mins
Moonrise: 10:19 PM
Moon Transit: 5:04 AM
Moonset: 12:38 AM
Moon Phase: Waning Gibbous
Moon Illumination: 60.5%

Best Times for Fishing or Hunting

Major Periods

4:34 AM - 7:04 AM
6:47 PM - 9:17 PM

Minor Periods

9:49 PM - 11:19 PM
12:08 AM - 1:38 PM

Action Rating: 3 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.

Webcams Near McLean, VA