Water Temperature of Difficult Run in McLean, VA

Current Water Temperature

66.9°F

Measurement Time: Friday, June 5, 2026, 2:15 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

60.8°F
Sunny
Sunny
60.8°F
68.7°F
82%
W 2.7 mph
5.5 mph
66.5°F
52°F
0 in
0%
9 mi
1019 mbar
0.3

Five Day Weather Forecast

Sunny
Fri
H: 96°F
L: 59°F
Sunny
Sat
H: 94°F
L: 66°F
Patchy rain nearby
Sun
H: 89°F
L: 64°F
Patchy rain nearby
Mon
H: 82°F
L: 65°F
Sunny
Tue
H: 85°F
L: 56°F

Air Quality

AQI: 1 - Good
PM2.5: 11.2 μg/m3
PM10: 11.5 μg/m3
Carbon Monoxide: 187 μg/m3
Nitrogen Dioxide: 23.7 μg/m3
Sulphur Dioxide: 1.6 μg/m3
Ozone: 43 μg/m3

Astronomical

Sunrise: 5:44 AM
Sun Transit: 1:07 PM
Sunset: 8:32 PM
Daylight: 14 hrs 48 mins
Moonrise: 12:07 AM
Moon Transit: 5:04 AM
Moonset: 10:09 AM
Moon Phase: Waning Gibbous
Moon Illumination: 65.0%

Best Times for Fishing or Hunting

Major Periods

4:34 AM - 7:04 AM
6:42 PM - 9:12 PM

Minor Periods

9:39 AM - 11:09 AM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Air Quality Alert issued June 4 at 4:40PM EDT by NWS Baltimore MD/Washington DC

Non-Weather Emergency Message. Not sent to IPAWS.

Effective: Thu June 4, 2026, 4:40 PM
Expires: Sat June 6, 2026, 12:00 AM

The Virginia Department of Environmental Quality has issued a Code ORANGE Air Quality Alert Friday for Northern Virginia. A Code Orange Air Quality Alert means that air pollution concentrations within the region may become unhealthy for sensitive groups. Sensitive groups include children, people suffering from asthma, heart disease or other lung diseases and the elderly. The effects of air pollution can be minimized by avoiding strenuous activity or exercise outdoors. For more information on ground-level ozone and fine particles visit the web site Virginia DEQ air quality web site at www.deq.virginia.gov


Air Quality Alert issued June 4 at 4:40PM EDT by NWS Baltimore MD/Washington DC

Non-Weather Emergency Message. Not sent to IPAWS.

Effective: Thu June 4, 2026, 4:40 PM
Expires: Sat June 6, 2026, 12:00 AM

The Maryland Department of the Environment has issued a Code ORANGE Air Quality Alert Friday for the Maryland suburban DC region. A Code Orange Air Quality Alert means that air pollution concentrations within the region may become unhealthy for sensitive groups. Sensitive groups include children, people suffering from asthma, heart disease or other lung diseases and the elderly. The effects of air pollution can be minimized by avoiding strenuous activity or exercise outdoors. For more information on ground-level ozone and fine particles visit the web site mde.maryland.gov/programs/air/AirQualityMonitoring/Pages/index.aspx


Air Quality Alert issued June 4 at 4:40PM EDT by NWS Baltimore MD/Washington DC

Non-Weather Emergency Message. Not sent to IPAWS.

Effective: Thu June 4, 2026, 4:40 PM
Expires: Sat June 6, 2026, 12:00 AM

The Metropolitan Washington Council of Governments and District Department of Environment has issued a Code ORANGE Air Quality Alert Friday for the District of Columbia. A Code Orange Air Quality Alert means that air pollution concentrations within the region may become unhealthy for sensitive groups. Sensitive groups include children, people suffering from asthma, heart disease or other lung diseases and the elderly. The effects of air pollution can be minimized by avoiding strenuous activity or exercise outdoors. For more information on ground-level ozone and fine particles visit the web site https://www.mwcog.org/environment/air/forecast/


Air Quality Alert issued June 4 at 4:40PM EDT by NWS Baltimore MD/Washington DC

Non-Weather Emergency Message. Not sent to IPAWS.

Effective: Thu June 4, 2026, 4:40 PM
Expires: Sat June 6, 2026, 12:00 AM

The Maryland Department of the Environment has issued a Code ORANGE Air Quality Alert Friday for the Baltimore City Metro and Annapolis region. A Code Orange Air Quality Alert means that air pollution concentrations within the region may become unhealthy for sensitive groups. Sensitive groups include children, people suffering from asthma, heart disease or other lung diseases and the elderly. The effects of air pollution can be minimized by avoiding strenuous activity or exercise outdoors. For more information on ground-level ozone and fine particles visit the web site mde.maryland.gov/programs/air/AirQualityMonitoring/Pages/index.aspx


Friday, June 5, 2026

Weather Forecast

Sunny
96.3°F
59.2°F
77.3°F
48%
0 in
0%
0%
6.9 mph
9.2


Air Quality

AQI: 1 - Good
PM2.5: 9 μg/m3
PM10: 9.57 μg/m3
Carbon Monoxide: 159.96 μg/m3
Nitrogen Dioxide: 17.97 μg/m3
Sulphur Dioxide: 2.12 μg/m3
Ozone: 89.92 μg/m3

Astronomical

Sunrise: 5:44 AM
Sun Transit: 1:07 PM
Sunset: 8:32 PM
Daylight: 14 hrs 48 mins
Moonrise: 12:07 AM
Moon Transit: 5:04 AM
Moonset: 10:09 AM
Moon Phase: Waning Gibbous
Moon Illumination: 65.0%

Best Times for Fishing or Hunting

Major Periods

4:34 AM - 7:04 AM
6:42 PM - 9:12 PM

Minor Periods

9:39 AM - 11:09 AM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Saturday, June 6, 2026

Weather Forecast

Sunny
94.1°F
66.1°F
79.8°F
49%
0 in
1%
0%
8.9 mph
8.7


Air Quality

AQI: 1 - Good
PM2.5: 8.27 μg/m3
PM10: 9.21 μg/m3
Carbon Monoxide: 145.04 μg/m3
Nitrogen Dioxide: 10.79 μg/m3
Sulphur Dioxide: 1.57 μg/m3
Ozone: 87.79 μg/m3

Astronomical

Sunrise: 5:44 AM
Sun Transit: 1:07 PM
Sunset: 8:32 PM
Daylight: 14 hrs 49 mins
Moonrise: 12:35 AM
Moon Transit: 5:49 AM
Moonset: 11:12 AM
Moon Phase: Last Quarter
Moon Illumination: 53.9%

Best Times for Fishing or Hunting

Major Periods

5:19 AM - 7:49 AM
7:26 PM - 9:56 PM

Minor Periods

10:42 AM - 12:12 AM
12:05 AM - 1:35 AM

Action Rating: 3 out of 5

Sunday, June 7, 2026

Weather Forecast

Patchy rain nearby
89.4°F
64.3°F
77.6°F
61%
0.14 in
73%
0%
10.1 mph
0.9


Air Quality

AQI: 1 - Good
PM2.5: 4.65 μg/m3
PM10: 5.31 μg/m3
Carbon Monoxide: 139.83 μg/m3
Nitrogen Dioxide: 4.04 μg/m3
Sulphur Dioxide: 0.95 μg/m3
Ozone: 94.04 μg/m3

Astronomical

Sunrise: 5:43 AM
Sun Transit: 1:07 PM
Sunset: 8:33 PM
Daylight: 14 hrs 50 mins
Moonrise: 12:59 AM
Moon Transit: 6:33 AM
Moonset: 12:16 AM
Moon Phase: Last Quarter
Moon Illumination: 42.6%

Best Times for Fishing or Hunting

Major Periods

6:03 AM - 8:33 AM
8:09 PM - 10:39 PM

Minor Periods

11:46 AM - 1:16 PM
12:29 AM - 1:59 AM

Action Rating: 4 out of 5

Monday, June 8, 2026

Weather Forecast

Patchy rain nearby
81.7°F
65.3°F
72.4°F
65%
0.03 in
73%
0%
11.4 mph
5


Air Quality

AQI: 1 - Good
PM2.5: 4.31 μg/m3
PM10: 4.63 μg/m3
Carbon Monoxide: 150.49 μg/m3
Nitrogen Dioxide: 5.03 μg/m3
Sulphur Dioxide: 1.46 μg/m3
Ozone: 91.08 μg/m3

Astronomical

Sunrise: 5:43 AM
Sun Transit: 1:08 PM
Sunset: 8:33 PM
Daylight: 14 hrs 50 mins
Moonrise: 1:22 AM
Moon Transit: 7:16 AM
Moonset: 1:20 PM
Moon Phase: Last Quarter
Moon Illumination: 31.6%

Best Times for Fishing or Hunting

Major Periods

6:46 AM - 9:16 AM
12:00 AM - 12:00 AM

Minor Periods

12:50 AM - 2:20 PM
12:52 AM - 2:22 AM

Action Rating: 2 out of 5

Tuesday, June 9, 2026

Weather Forecast

Sunny
85°F
55.5°F
65.8°F
57%
0 in
1%
0%
6.3 mph
5


Air Quality

AQI: 1 - Good
PM2.5: 4.58 μg/m3
PM10: 5.8 μg/m3
Carbon Monoxide: 149.78 μg/m3
Nitrogen Dioxide: 7.32 μg/m3
Sulphur Dioxide: 1.61 μg/m3
Ozone: 69 μg/m3

Astronomical

Sunrise: 5:43 AM
Sun Transit: 1:08 PM
Sunset: 8:34 PM
Daylight: 14 hrs 51 mins
Moonrise: 1:45 AM
Moon Transit: 6:27 AM
Moonset: 2:27 PM
Moon Phase: Last Quarter
Moon Illumination: 21.6%

Best Times for Fishing or Hunting

Major Periods

5:57 AM - 8:27 AM
5:57 AM - 8:27 AM

Minor Periods

1:57 PM - 3:27 PM
1:15 AM - 2:45 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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