Water Temperature of Difficult Run in McLean, VA

Current Water Temperature

53.1°F

Measurement Time: Wednesday, April 8, 2026, 12:15 AM 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

36°F
Clear
Clear
31°F
34.6°F
42%
NNE 5.8 mph
9.4 mph
31.9°F
13.7°F
0 in
0%
9 mi
1032 mbar
0

Five Day Weather Forecast

Sunny
Wed
H: 59°F
L: 30°F
Partly Cloudy
Thu
H: 60°F
L: 35°F
Mist
Fri
H: 74°F
L: 40°F
Partly Cloudy
Sat
H: 66°F
L: 54°F
Partly Cloudy
Sun
H: 71°F
L: 46°F

Air Quality

AQI: 1 - Good
PM2.5: 9.05 μg/m3
PM10: 9.25 μg/m3
Carbon Monoxide: 210.85 μg/m3
Nitrogen Dioxide: 11.55 μg/m3
Sulphur Dioxide: 7.35 μg/m3
Ozone: 61 μg/m3

Astronomical

Sunrise: 6:43 AM
Sun Transit: 1:10 PM
Sunset: 7:39 PM
Daylight: 12 hrs 56 mins
Moonrise: 1:32 AM
Moon Transit: 5:57 AM
Moonset: 10:23 AM
Moon Phase: Last Quarter
Moon Illumination: 53.2%

Best Times for Fishing or Hunting

Major Periods

5:27 AM - 7:57 AM
7:39 PM - 10:09 PM

Minor Periods

9:53 AM - 11:23 AM
1:02 AM - 2:32 AM

Action Rating: 3 out of 5

Freeze Warning issued April 7 at 6:57PM EDT until April 8 at 9:00AM EDT by NWS Baltimore MD/Washington DC

Effective: Tue April 7, 2026, 6:57 PM
Expires: Wed April 8, 2026, 3:00 AM

* WHAT...Sub-freezing temperatures as low as 30 expected. * WHERE...In DC, District of Columbia. In Maryland, Anne Arundel, Central and Southeast Howard, Central and Southeast Montgomery, Prince Georges, Southern Baltimore, and Charles Counties. In Virginia, King George and Fairfax Counties, and Arlington/Falls Church/Alexandria. * WHEN...From midnight tonight to 9 AM EDT Wednesday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.

Take steps now to protect tender plants from the cold.


Freeze Warning issued April 8 at 2:03AM EDT until April 8 at 9:00AM EDT by NWS Baltimore MD/Washington DC

Effective: Wed April 8, 2026, 2:03 AM
Expires: Wed April 8, 2026, 9:00 AM

* WHAT...Sub-freezing temperatures as low as 30. * WHERE...The District of Columbia. In Maryland, Anne Arundel, Central and Southeast Howard, Central and Southeast Montgomery, Prince Georges, Southern Baltimore, and Charles Counties. In Virginia, King George and Fairfax Counties, and Arlington/Falls Church/Alexandria. * WHEN...Until 9 AM EDT this morning. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.

Take steps now to protect tender plants from the cold.


Freeze Warning issued April 7 at 6:57PM EDT until April 8 at 9:00AM EDT by NWS Baltimore MD/Washington DC

Effective: Tue April 7, 2026, 6:57 PM
Expires: Wed April 8, 2026, 3:00 AM

* WHAT...For the Freeze Warning, sub-freezing temperatures as low as 26 expected. For the Freeze Watch, sub-freezing temperatures as low as 32 possible. * WHERE...Portions of central, north central, northeast, and northern Maryland, central, northern, northwest, and western Virginia, and panhandle West Virginia. * WHEN...For the Freeze Warning, from midnight tonight to 9 AM EDT Wednesday. For the Freeze Watch, from late Wednesday night through Thursday morning. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.

Take steps now to protect tender plants from the cold.


Freeze Watch issued April 7 at 6:57PM EDT until April 9 at 9:00AM EDT by NWS Baltimore MD/Washington DC

Effective: Tue April 7, 2026, 6:57 PM
Expires: Wed April 8, 2026, 3:00 AM

* WHAT...For the Freeze Warning, sub-freezing temperatures as low as 26 expected. For the Freeze Watch, sub-freezing temperatures as low as 32 possible. * WHERE...Portions of central, north central, northeast, and northern Maryland, central, northern, northwest, and western Virginia, and panhandle West Virginia. * WHEN...For the Freeze Warning, from midnight tonight to 9 AM EDT Wednesday. For the Freeze Watch, from late Wednesday night through Thursday morning. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.

Take steps now to protect tender plants from the cold.


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

Effective: Wed April 8, 2026, 2:28 AM
Expires: Wed April 8, 2026, 2:38 AM

Monitoring message only. Please disregard.

Monitoring message only. Please disregard.
Wednesday, April 8, 2026

Weather Forecast

Sunny
59.4°F
30.2°F
43.4°F
37%
0 in
0%
0%
8.1 mph
1.5


Air Quality

AQI: 1 - Good
PM2.5: 7.03 μg/m3
PM10: 7.5 μg/m3
Carbon Monoxide: 208.65 μg/m3
Nitrogen Dioxide: 11 μg/m3
Sulphur Dioxide: 5.81 μg/m3
Ozone: 73.24 μg/m3

Astronomical

Sunrise: 6:43 AM
Sun Transit: 1:10 PM
Sunset: 7:39 PM
Daylight: 12 hrs 56 mins
Moonrise: 1:32 AM
Moon Transit: 5:57 AM
Moonset: 10:23 AM
Moon Phase: Last Quarter
Moon Illumination: 53.2%

Best Times for Fishing or Hunting

Major Periods

5:27 AM - 7:57 AM
7:39 PM - 10:09 PM

Minor Periods

9:53 AM - 11:23 AM
1:02 AM - 2:32 AM

Action Rating: 3 out of 5

Thursday, April 9, 2026

Weather Forecast

Partly Cloudy
60.1°F
35.1°F
44.2°F
78%
0 in
0%
0%
6.9 mph
1.4


Air Quality

AQI: 1 - Good
PM2.5: 10.43 μg/m3
PM10: 12.82 μg/m3
Carbon Monoxide: 214.01 μg/m3
Nitrogen Dioxide: 16.12 μg/m3
Sulphur Dioxide: 6.14 μg/m3
Ozone: 77.12 μg/m3

Astronomical

Sunrise: 6:41 AM
Sun Transit: 1:10 PM
Sunset: 7:40 PM
Daylight: 12 hrs 59 mins
Moonrise: 2:21 AM
Moon Transit: 6:49 AM
Moonset: 11:20 AM
Moon Phase: Last Quarter
Moon Illumination: 41.9%

Best Times for Fishing or Hunting

Major Periods

6:19 AM - 8:49 AM
8:30 PM - 11:00 PM

Minor Periods

10:50 AM - 12:20 AM
1:51 AM - 3:21 AM

Action Rating: 3 out of 5

Friday, April 10, 2026

Weather Forecast

Mist
74.3°F
39.7°F
55.1°F
72%
0 in
0%
0%
5.8 mph
1.7


Air Quality

AQI: 1 - Good
PM2.5: 10.62 μg/m3
PM10: 11.89 μg/m3
Carbon Monoxide: 196.93 μg/m3
Nitrogen Dioxide: 15.49 μg/m3
Sulphur Dioxide: 5.6 μg/m3
Ozone: 78.04 μg/m3

Astronomical

Sunrise: 6:40 AM
Sun Transit: 1:10 PM
Sunset: 7:41 PM
Daylight: 13 hrs 1 mins
Moonrise: 3:02 AM
Moon Transit: 7:39 AM
Moonset: 12:23 AM
Moon Phase: Last Quarter
Moon Illumination: 31.0%

Best Times for Fishing or Hunting

Major Periods

7:09 AM - 9:39 AM
9:19 PM - 11:49 PM

Minor Periods

11:53 AM - 1:23 PM
2:32 AM - 4:02 AM

Action Rating: 3 out of 5

Saturday, April 11, 2026

Weather Forecast

Partly Cloudy
65.6°F
53.7°F
59.7°F
57%
0 in
0%
0%
11.9 mph
1.6


Air Quality

AQI: 1 - Good
PM2.5: 7.54 μg/m3
PM10: 7.93 μg/m3
Carbon Monoxide: 215.21 μg/m3
Nitrogen Dioxide: 12.53 μg/m3
Sulphur Dioxide: 4.54 μg/m3
Ozone: 80.6 μg/m3

Astronomical

Sunrise: 6:38 AM
Sun Transit: 1:10 PM
Sunset: 7:42 PM
Daylight: 13 hrs 4 mins
Moonrise: 3:36 AM
Moon Transit: 8:28 AM
Moonset: 1:27 PM
Moon Phase: Last Quarter
Moon Illumination: 21.1%

Best Times for Fishing or Hunting

Major Periods

7:58 AM - 10:28 AM
12:00 AM - 12:00 AM

Minor Periods

12:57 AM - 2:27 PM
3:06 AM - 4:36 AM

Action Rating: 2 out of 5

Sunday, April 12, 2026

Weather Forecast

Partly Cloudy
70.6°F
45.5°F
55°F
56%
0 in
0%
0%
10.7 mph
0


Air Quality

AQI: 1 - Good
PM2.5: 10.01 μg/m3
PM10: 10.21 μg/m3
Carbon Monoxide: 275.37 μg/m3
Nitrogen Dioxide: 23.91 μg/m3
Sulphur Dioxide: 5.85 μg/m3
Ozone: 51.69 μg/m3

Astronomical

Sunrise: 6:37 AM
Sun Transit: 1:09 PM
Sunset: 7:43 PM
Daylight: 13 hrs 6 mins
Moonrise: 4:06 AM
Moon Transit: 9:15 AM
Moonset: 2:33 PM
Moon Phase: Waning Crescent
Moon Illumination: 12.6%

Best Times for Fishing or Hunting

Major Periods

8:45 AM - 11:15 AM
12:00 AM - 12:00 AM

Minor Periods

2:03 PM - 3:33 PM
3:36 AM - 5:06 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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