Water Temperature of Difficult Run in McLean, VA

Current Water Temperature

32.0°F

Measurement Time: Tuesday, January 27, 2026, 8:15 AM EST

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

25°F
Partly cloudy
Partly cloudy
15.6°F
28.8°F
32%
SW 8.9 mph
10.7 mph
21.2°F
17.2°F
0 in
75%
9 mi
1017 mbar
1.9

Five Day Weather Forecast

Sunny
Tue
H: 34°F
L: 4°F
Partly Cloudy
Wed
H: 23°F
L: 8°F
Sunny
Thu
H: 22°F
L: 8°F
Partly Cloudy
Fri
H: 21°F
L: 6°F
Overcast
Sat
H: 20°F
L: 12°F

Air Quality

AQI: 1 - Good
PM2.5: 22.05 μg/m3
PM10: 22.65 μg/m3
Carbon Monoxide: 420.85 μg/m3
Nitrogen Dioxide: 51.25 μg/m3
Sulphur Dioxide: 4.75 μg/m3
Ozone: 35 μg/m3

Astronomical

Sunrise: 7:19 AM
Sun Transit: 12:21 AM
Sunset: 5:24 PM
Daylight: 10 hrs 5 mins
Moonrise: 11:51 AM
Moon Transit: 7:35 PM
Moonset: 2:14 AM
Moon Phase: First Quarter
Moon Illumination: 68.0%

Best Times for Fishing or Hunting

Major Periods

8:22 AM - 10:52 AM
7:05 PM - 9:35 PM

Minor Periods

11:21 AM - 12:51 AM
1:44 AM - 3:14 AM

Action Rating: 2 out of 5

Cold Weather Advisory issued January 27 at 11:03AM EST until January 28 at 11:00AM EST by NWS Baltimore MD/Washington DC

Effective: Tue January 27, 2026, 11:03 AM
Expires: Tue January 27, 2026, 7:15 PM

* WHAT...For Cold Weather Advisory, very cold wind chills as low as 3 to 9 below zero expected. * WHERE...Portions of DC, central, northeast, northern, and southern Maryland, and central and northern Virginia. * WHEN...From 7 PM this evening to 11 AM EST Wednesday. * IMPACTS...The cold wind chills as low as 10 below zero could result in hypothermia if precautions are not taken. Frostbite and hypothermia will occur if unprotected skin is exposed to these temperatures. Wind chill values can lead to hypothermia with prolonged exposure. * ADDITIONAL DETAILS...Additional Cold Weather Headlines are expected at times through the end of the week as the region remains in an Arctic Airmass.

Use caution while traveling outside. Wear appropriate clothing, a hat, and gloves. Keep pets indoors as much as possible. Make sure outdoor animals have a warm, dry shelter, food, and unfrozen water.


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

Effective: Tue January 27, 2026, 1:22 PM
Expires: Tue January 27, 2026, 1:32 PM

Monitoring message only. Please disregard.

Monitoring message only. Please disregard.
Tuesday, January 27, 2026

Weather Forecast

Sunny
33.6°F
3.6°F
18.3°F
62%
0 in
0%
0%
11 mph
0.6


Air Quality

AQI: 1 - Good
PM2.5: 11.82 μg/m3
PM10: 12.06 μg/m3
Carbon Monoxide: 268.13 μg/m3
Nitrogen Dioxide: 16.66 μg/m3
Sulphur Dioxide: 4.9 μg/m3
Ozone: 62.72 μg/m3

Astronomical

Sunrise: 7:19 AM
Sun Transit: 12:21 AM
Sunset: 5:24 PM
Daylight: 10 hrs 5 mins
Moonrise: 11:51 AM
Moon Transit: 7:35 PM
Moonset: 2:14 AM
Moon Phase: First Quarter
Moon Illumination: 68.0%

Best Times for Fishing or Hunting

Major Periods

8:22 AM - 10:52 AM
7:05 PM - 9:35 PM

Minor Periods

11:21 AM - 12:51 AM
1:44 AM - 3:14 AM

Action Rating: 2 out of 5

Wednesday, January 28, 2026

Weather Forecast

Partly Cloudy
22.8°F
8.4°F
16.5°F
68%
0 in
0%
0%
11 mph
0.5


Air Quality

AQI: 1 - Good
PM2.5: 10.19 μg/m3
PM10: 10.32 μg/m3
Carbon Monoxide: 248.65 μg/m3
Nitrogen Dioxide: 15.72 μg/m3
Sulphur Dioxide: 4.65 μg/m3
Ozone: 62.52 μg/m3

Astronomical

Sunrise: 7:18 AM
Sun Transit: 12:21 AM
Sunset: 5:25 PM
Daylight: 10 hrs 7 mins
Moonrise: 12:40 AM
Moon Transit: 8:38 PM
Moonset: 3:29 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 78.1%

Best Times for Fishing or Hunting

Major Periods

9:22 AM - 11:52 AM
8:08 PM - 10:38 PM

Minor Periods

12:10 AM - 1:40 PM
2:59 AM - 4:29 AM

Action Rating: 2 out of 5

Thursday, January 29, 2026

Weather Forecast

Sunny
22.3°F
8.1°F
15.6°F
65%
0 in
0%
0%
9.4 mph
0.5


Air Quality

AQI: 1 - Good
PM2.5: 10.74 μg/m3
PM10: 10.85 μg/m3
Carbon Monoxide: 258.17 μg/m3
Nitrogen Dioxide: 17.37 μg/m3
Sulphur Dioxide: 5.99 μg/m3
Ozone: 59.68 μg/m3

Astronomical

Sunrise: 7:18 AM
Sun Transit: 12:22 AM
Sunset: 5:27 PM
Daylight: 10 hrs 9 mins
Moonrise: 1:39 PM
Moon Transit: 9:42 PM
Moonset: 4:41 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 86.7%

Best Times for Fishing or Hunting

Major Periods

10:27 AM - 12:57 AM
9:12 PM - 11:42 PM

Minor Periods

1:09 PM - 2:39 PM
4:11 AM - 5:41 AM

Action Rating: 2 out of 5

Friday, January 30, 2026

Weather Forecast

Partly Cloudy
20.9°F
5.9°F
13.8°F
70%
0 in
0%
0%
8.5 mph
0


Air Quality

AQI: 1 - Good
PM2.5: 9.6 μg/m3
PM10: 9.63 μg/m3
Carbon Monoxide: 256.85 μg/m3
Nitrogen Dioxide: 14.75 μg/m3
Sulphur Dioxide: 5.53 μg/m3
Ozone: 59.76 μg/m3

Astronomical

Sunrise: 7:17 AM
Sun Transit: 12:22 AM
Sunset: 5:28 PM
Daylight: 10 hrs 11 mins
Moonrise: 2:50 PM
Moon Transit: 10:46 PM
Moonset: 5:44 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 93.4%

Best Times for Fishing or Hunting

Major Periods

11:31 AM - 2:01 PM
12:00 AM - 12:00 AM

Minor Periods

2:20 PM - 3:50 PM
5:14 AM - 6:44 AM

Action Rating: 2 out of 5

Saturday, January 31, 2026

Weather Forecast

Overcast
19.7°F
12.3°F
16.4°F
69%
0 in
0%
6%
14.8 mph
1


Air Quality

AQI: 1 - Good
PM2.5: 6.65 μg/m3
PM10: 6.74 μg/m3
Carbon Monoxide: 227 μg/m3
Nitrogen Dioxide: 14.02 μg/m3
Sulphur Dioxide: 4.77 μg/m3
Ozone: 57.31 μg/m3

Astronomical

Sunrise: 7:16 AM
Sun Transit: 12:22 AM
Sunset: 5:29 PM
Daylight: 10 hrs 13 mins
Moonrise: 4:05 PM
Moon Transit: 11:46 PM
Moonset: 6:35 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 97.9%

Best Times for Fishing or Hunting

Major Periods

12:33 AM - 3:03 PM
12:00 AM - 12:00 AM

Minor Periods

3:35 PM - 5:05 PM
6:05 AM - 7:35 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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