Water Temperature of Difficult Run in McLean, VA

Current Water Temperature

38.3°F

Measurement Time: Thursday, January 8, 2026, 9:15 PM EST

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

44.1°F
Partly cloudy
Partly cloudy
40.3°F
39.1°F
73%
SSE 6.5 mph
11.5 mph
35.5°F
34.7°F
0 in
75%
9 mi
1024 mbar
0

Five Day Weather Forecast

Moderate rain
Fri
H: 47°F
L: 35°F
Heavy rain
Sat
H: 48°F
L: 42°F
Partly Cloudy
Sun
H: 48°F
L: 33°F
Sunny
Mon
H: 44°F
L: 31°F
Sunny
Tue
H: 48°F
L: 32°F

Air Quality

PM2.5: 9.15 μg/m3
PM10: 9.95 μg/m3
Carbon Monoxide: 249.85 μg/m3
Nitrogen Dioxide: 18.85 μg/m3
Sulphur Dioxide: 6.65 μg/m3
Ozone: 38 μg/m3

Astronomical

Sunrise: 7:28 AM
Sun Transit: 12:16 AM
Sunset: 5:05 PM
Daylight: 9 hrs 37 mins
Moonrise: 12:08 AM
Moon Transit: 5:08 AM
Moonset: 11:00 AM
Moon Phase: Waning Gibbous
Moon Illumination: 57.8%

Best Times for Fishing or Hunting

Major Periods

4:38 AM - 7:08 AM
6:44 PM - 9:14 PM

Minor Periods

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

Action Rating: 3 out of 5

This is only a test for monitoring of vital dissemination systems.

Effective: Fri January 9, 2026, 1:27 AM
Expires: Fri January 9, 2026, 1:37 AM

Monitoring message only. Please disregard.

Monitoring message only. Please disregard.


Special Weather Statement issued January 9 at 1:27AM EST by NWS Baltimore MD/Washington DC

Effective: Fri January 9, 2026, 1:27 AM
Expires: Fri January 9, 2026, 3:00 AM

A line of showers is moving across Northeast Maryland early this morning. Around 15 minutes of light precipitation is occurring in any given location as this line moves through from west to east. Most locations have temperatures above freezing and are experiencing plain rain. However, a few locations have dropped back to at or slightly below freezing, and could experience a very brief period of freezing rain. This line of light showers should clear Northeast Maryland by 3 AM. With temperatures right around freezing, elevated surfaces such as roofs, cartops, and deck railings may get a light glaze of ice on them. Use extra caution if traveling on untreated surfaces, especially elevated ones like bridges and overpasses as slick spots are possible.


Friday, January 9, 2026

Weather Forecast

Moderate rain
46.8°F
34.9°F
42.6°F
88%
0.76 in
84%
0%
11.4 mph
0.3


Air Quality

AQI: 1 - Good
PM2.5: 13.51 μg/m3
PM10: 14.09 μg/m3
Carbon Monoxide: 301.01 μg/m3
Nitrogen Dioxide: 27.06 μg/m3
Sulphur Dioxide: 9.37 μg/m3
Ozone: 32.6 μg/m3

Astronomical

Sunrise: 7:28 AM
Sun Transit: 12:16 AM
Sunset: 5:05 PM
Daylight: 9 hrs 37 mins
Moonrise: 12:08 AM
Moon Transit: 5:08 AM
Moonset: 11:00 AM
Moon Phase: Waning Gibbous
Moon Illumination: 57.8%

Best Times for Fishing or Hunting

Major Periods

4:38 AM - 7:08 AM
6:44 PM - 9:14 PM

Minor Periods

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

Action Rating: 3 out of 5

Saturday, January 10, 2026

Weather Forecast

Heavy rain
48.4°F
41.9°F
46.6°F
92%
2.93 in
89%
0%
9.2 mph
0


Air Quality

AQI: 1 - Good
PM2.5: 9.69 μg/m3
PM10: 9.77 μg/m3
Carbon Monoxide: 253.05 μg/m3
Nitrogen Dioxide: 24.55 μg/m3
Sulphur Dioxide: 6.25 μg/m3
Ozone: 24.84 μg/m3

Astronomical

Sunrise: 7:27 AM
Sun Transit: 12:16 AM
Sunset: 5:06 PM
Daylight: 9 hrs 38 mins
Moonrise: 12:10 AM
Moon Transit: 5:50 AM
Moonset: 11:22 AM
Moon Phase: Last Quarter
Moon Illumination: 46.5%

Best Times for Fishing or Hunting

Major Periods

5:20 AM - 7:50 AM
7:25 PM - 9:55 PM

Minor Periods

10:52 AM - 12:22 AM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

Sunday, January 11, 2026

Weather Forecast

Partly Cloudy
47.5°F
32.9°F
40°F
70%
0 in
0%
0%
17.2 mph
0.4


Air Quality

AQI: 1 - Good
PM2.5: 5.94 μg/m3
PM10: 6.17 μg/m3
Carbon Monoxide: 173.75 μg/m3
Nitrogen Dioxide: 14.27 μg/m3
Sulphur Dioxide: 7.41 μg/m3
Ozone: 55.56 μg/m3

Astronomical

Sunrise: 7:27 AM
Sun Transit: 12:17 AM
Sunset: 5:07 PM
Daylight: 9 hrs 40 mins
Moonrise: 1:10 AM
Moon Transit: 6:31 AM
Moonset: 11:45 AM
Moon Phase: Last Quarter
Moon Illumination: 35.3%

Best Times for Fishing or Hunting

Major Periods

6:01 AM - 8:31 AM
8:08 PM - 10:38 PM

Minor Periods

11:15 AM - 12:45 AM
12:40 AM - 2:10 AM

Action Rating: 2 out of 5

Monday, January 12, 2026

Weather Forecast

Sunny
43.9°F
30.5°F
35.9°F
50%
0 in
0%
0%
16.1 mph
0.4


Air Quality

AQI: 1 - Good
PM2.5: 2.97 μg/m3
PM10: 3.05 μg/m3
Carbon Monoxide: 185.66 μg/m3
Nitrogen Dioxide: 7.51 μg/m3
Sulphur Dioxide: 6.87 μg/m3
Ozone: 60.92 μg/m3

Astronomical

Sunrise: 7:27 AM
Sun Transit: 12:17 AM
Sunset: 5:08 PM
Daylight: 9 hrs 41 mins
Moonrise: 2:12 AM
Moon Transit: 7:15 AM
Moonset: 12:12 AM
Moon Phase: Last Quarter
Moon Illumination: 25.0%

Best Times for Fishing or Hunting

Major Periods

6:45 AM - 9:15 AM
8:53 PM - 11:23 PM

Minor Periods

11:42 AM - 1:12 PM
1:42 AM - 3:12 AM

Action Rating: 2 out of 5

Tuesday, January 13, 2026

Weather Forecast

Sunny
47.9°F
31.6°F
36.6°F
52%
0 in
0%
0%
12.5 mph
0


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: 7:27 AM
Sun Transit: 12:17 AM
Sunset: 5:09 PM
Daylight: 9 hrs 42 mins
Moonrise: 3:14 AM
Moon Transit: 8:01 AM
Moonset: 12:44 AM
Moon Phase: Waning Crescent
Moon Illumination: 15.9%

Best Times for Fishing or Hunting

Major Periods

7:31 AM - 10:01 AM
12:00 AM - 12:00 AM

Minor Periods

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

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

Sponsored Content