Water Temperature of Difficult Run in McLean, VA

Current Water Temperature

31.8°F

Measurement Time: Saturday, January 24, 2026, 9:15 PM 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

14.7°F
Patchy light snow
Patchy light snow
5.8°F
17.8°F
84%
ESE 5.8 mph
7.6 mph
9°F
1.5°F
0 in
100%
1 mi
1034 mbar
0

Five Day Weather Forecast

Ice pellets
Sun
H: 29°F
L: 15°F
Sunny
Mon
H: 30°F
L: 5°F
Sunny
Tue
H: 27°F
L: 7°F
Light freezing rain
Wed
H: 25°F
L: 1°F
Cloudy
Thu
H: 22°F
L: 4°F

Air Quality

AQI: 2 - Moderate
PM2.5: 14.15 μg/m3
PM10: 15.45 μg/m3
Carbon Monoxide: 255.85 μg/m3
Nitrogen Dioxide: 21.55 μg/m3
Sulphur Dioxide: 5.15 μg/m3
Ozone: 44 μg/m3

Astronomical

Sunrise: 7:21 AM
Sun Transit: 12:21 AM
Sunset: 5:22 PM
Daylight: 10 hrs 1 mins
Moonrise: 10:42 AM
Moon Transit: 5:43 PM
Moonset: 12:47 AM
Moon Phase: First Quarter
Moon Illumination: 45.8%

Best Times for Fishing or Hunting

Major Periods

6:34 AM - 9:04 AM
5:13 PM - 7:43 PM

Minor Periods

10:12 AM - 11:42 AM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

Winter Storm Warning issued January 24 at 8:32PM EST until January 26 at 4:00AM EST by NWS Baltimore MD/Washington DC

Effective: Sat January 24, 2026, 8:32 PM
Expires: Sun January 25, 2026, 4:45 AM

...MAJOR WINTER STORM WILL IMPACT THE REGION THIS EVENING THROUGH SUNDAY EVENING... .A large area of precipitation will overrun Arctic air in place over the Mid-Atlantic. This will lead to widespread significant snow beginning this evening, with the potential for ice Sunday especially south of Highway 50 and near and east of Interstate 95. In addition to the high threat for significant snow and ice, very cold temperatures are expected tonight through the middle of next week with sub-zero wind chills likely at times. * WHAT...Heavy mixed precipitation expected. Total snow and sleet accumulations between 6 and 10 inches, with up to 12 inches possible, especially in the far northern and western suburbs of Washington and Baltimore. Ice accumulations between one and two tenths of an inch. * WHERE...Portions of DC, central, northeast, and northern Maryland, and northern Virginia. * WHEN...Until 4 AM EST Monday. * IMPACTS...Power outages and tree damage are likely due to the ice. Travel could be nearly impossible. The hazardous conditions could impact the Monday morning commute. * ADDITIONAL DETAILS...Snow will likely overspread the area tonight, becoming heavy at times with rates of one to two inches per hour possible at times. A mix with sleet or freezing rain is expected Sunday. Significant icing is possible especially south of Highway 50. Visibility of one-quarter mile or less is possible at times. A prolonged period of wind chills in the single digits and teens continues this evening and lasting through the middle of next week, with sub-zero wind chills possible at times.

If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. Persons should consider delaying all travel. Motorists should use extreme caution if travel is absolutely necessary.


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

Effective: Sun January 25, 2026, 1:22 AM
Expires: Sun January 25, 2026, 1:32 AM

Monitoring message only. Please disregard.

Monitoring message only. Please disregard.


Winter Storm Warning issued January 24 at 8:32PM EST until January 26 at 4:00AM EST by NWS Baltimore MD/Washington DC

Effective: Sat January 24, 2026, 8:32 PM
Expires: Sun January 25, 2026, 4:45 AM

...MAJOR WINTER STORM WILL IMPACT THE REGION THIS EVENING THROUGH SUNDAY EVENING... .A large area of precipitation will overrun Arctic air in place over the Mid-Atlantic. This will lead to widespread significant snow beginning this evening, with the potential for ice Sunday especially south of Highway 50 and near and east of Interstate 95. In addition to the high threat for significant snow and ice, very cold temperatures are expected tonight through the middle of next week with sub-zero wind chills likely at times. * WHAT...Heavy mixed precipitation expected. Total snow and sleet accumulations between 10 and 14 inches, with up to 18 inches possible near the Mason-Dixon line. Ice accumulations up to a tenth of an inch, mainly across the northern Shenandoah Valley. * WHERE...Portions of north central and western Maryland, northern and northwest Virginia, and eastern and panhandle West Virginia. * WHEN...Until 4 AM EST Monday. * IMPACTS...Travel could be very difficult to impossible. * ADDITIONAL DETAILS...Snow will likely overspread the area tonight, becoming heavy at times with rates of one to two inches per hour possible at times. A mix with sleet or freezing rain is expected Sunday. Visibility of one-quarter mile or less is possible at times. A prolonged period of very cold wind chills continues this evening and lasting through the middle of next week.

If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. Persons should consider delaying all travel. Motorists should use extreme caution if travel is absolutely necessary.


Sunday, January 25, 2026

Weather Forecast

Ice pellets
28.9°F
15.4°F
21.5°F
81%
1.48 in
83%
65%
9.8 mph
0.1


Air Quality

AQI: 1 - Good
PM2.5: 9.45 μg/m3
PM10: 10.33 μg/m3
Carbon Monoxide: 242.37 μg/m3
Nitrogen Dioxide: 20.03 μg/m3
Sulphur Dioxide: 6.01 μg/m3
Ozone: 49.68 μg/m3

Astronomical

Sunrise: 7:21 AM
Sun Transit: 12:21 AM
Sunset: 5:22 PM
Daylight: 10 hrs 1 mins
Moonrise: 10:42 AM
Moon Transit: 5:43 PM
Moonset: 12:47 AM
Moon Phase: First Quarter
Moon Illumination: 45.8%

Best Times for Fishing or Hunting

Major Periods

6:34 AM - 9:04 AM
5:13 PM - 7:43 PM

Minor Periods

10:12 AM - 11:42 AM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

Monday, January 26, 2026

Weather Forecast

Sunny
29.7°F
5.4°F
23.5°F
78%
0 in
0%
0%
17 mph
0.6


Air Quality

AQI: 1 - Good
PM2.5: 6.36 μg/m3
PM10: 6.51 μg/m3
Carbon Monoxide: 249.33 μg/m3
Nitrogen Dioxide: 20.52 μg/m3
Sulphur Dioxide: 4.41 μg/m3
Ozone: 49.28 μg/m3

Astronomical

Sunrise: 7:20 AM
Sun Transit: 12:21 AM
Sunset: 5:23 PM
Daylight: 10 hrs 3 mins
Moonrise: 11:12 AM
Moon Transit: 6:37 PM
Moonset: 12:59 AM
Moon Phase: First Quarter
Moon Illumination: 57.1%

Best Times for Fishing or Hunting

Major Periods

7:25 AM - 9:55 AM
6:07 PM - 8:37 PM

Minor Periods

10:42 AM - 12:12 AM
12:29 AM - 1:59 AM

Action Rating: 3 out of 5

Tuesday, January 27, 2026

Weather Forecast

Sunny
27.1°F
6.6°F
18.3°F
66%
0 in
0%
0%
11.2 mph
0.5


Air Quality

AQI: 1 - Good
PM2.5: 11.9 μg/m3
PM10: 12.14 μg/m3
Carbon Monoxide: 269.85 μg/m3
Nitrogen Dioxide: 17.97 μg/m3
Sulphur Dioxide: 5.47 μg/m3
Ozone: 62.28 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

Light freezing rain
25.1°F
1.1°F
16.7°F
87%
0.01 in
86%
25%
8.9 mph
0.5


Air Quality

AQI: 1 - Good
PM2.5: 15.11 μg/m3
PM10: 15.35 μg/m3
Carbon Monoxide: 294.33 μg/m3
Nitrogen Dioxide: 21.77 μg/m3
Sulphur Dioxide: 5.28 μg/m3
Ozone: 55.24 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

Cloudy
21.6°F
3.5°F
13.5°F
86%
0 in
0%
12%
13.4 mph
0


Air Quality

AQI: 2 - Moderate
PM2.5: 18.69 μg/m3
PM10: 18.89 μg/m3
Carbon Monoxide: 376.58 μg/m3
Nitrogen Dioxide: 40.93 μg/m3
Sulphur Dioxide: 5.52 μg/m3
Ozone: 32.08 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

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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