Observed 9:50 AM EDT at KDCA

Cabin John, MD weather

Mostly sunny and 52°11°, jacket by 7 PM.

Mostly agree

Now 52°11°

Mostly sunny

Wind: 7 mph11 km/h; From the northeast. Up to 7 mph11 km/h through 10 PM
Dew point: 45°7°; Comfortable
UV index: 1Low; Moderate 12–3 PM · peak 4
Air quality: 36Good; PM2.5 (fine particles) · tomorrow moderate
Pressure: 30.56 inHg1035 hPa; Rising slowly · +0.04 inHg+1.3 hPa in 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

7°4° cooler than this time yesterday (55°13° then, 48°9° now)

Good hours for

High 64°18° today at 2 PM
Below 50°10° tonight after 9 PM
Low 39°4° tomorrow at 6 AM
Above 50°10° tomorrow by 10 AM

This morningUp to 57°14° by 11 AM · Clear
This afternoonUp to 64°18° by 2 PM · Clear
TonightDown to 40°4° by 3 AM · Clear
Tomorrow morningUp to 59°15° by 11 AM · Clear
Tomorrow afternoonUp to 67°19° by 2 PM · Clear
Tomorrow nightDown to 42°6° by 5 AM · Clear
Monday morningUp to 45°7° by 9 AM · Clear

Hourly forecast, next 48 hours, in the place's local time
Hour	Conditions	Temperature	Feels like	Precipitation	Wind	Humidity	Cloud cover	UV index
Sat 10a	Mostly sunny	51°11° (likely 49°9° to 52°11°)	51°11°	0%	2 mph3 km/h from NE, gusts 5 mph8 km/h	71%	18%	1
Sat 11a	Sunny	57°14° (likely 55°13° to 57°14°)	57°14°	0%	3 mph5 km/h from E, gusts 9 mph14 km/h	62%	3%	2
Sat 12p	Sunny	59°15° (likely 58°14° to 60°16°)	59°15°	0%	3 mph5 km/h from E, gusts 10 mph16 km/h	55%	11%	3
Sat 1p	Mostly sunny	62°17° (likely 59°15° to 62°17°)	62°17°	0%	3 mph5 km/h from E, gusts 10 mph16 km/h	46%	16%	4
Sat 2p	Mostly sunny	64°18° (likely 60°16° to 64°18°)	64°18°	0%	3 mph5 km/h from E, gusts 9 mph14 km/h	43%	17%	3
Sat 3p	Mostly sunny	64°18° (likely 60°16° to 64°18°)	64°18°	0%	3 mph5 km/h from E, gusts 7 mph11 km/h	41%	23%	2
Sat 4p	Mostly sunny	64°18° (likely 60°16° to 64°18°)	64°18°	0%	5 mph8 km/h from E, gusts 8 mph13 km/h	43%	38%	1
Sat 5p	Mostly sunny	63°17° (likely 59°15° to 63°17°)	63°17°	0%	5 mph8 km/h from E, gusts 7 mph12 km/h	44%	19%	1
Sat 6p	Clear	59°15° (likely 56°13° to 59°15°)	59°15°	0%	3 mph5 km/h from E, gusts 8 mph12 km/h	51%	19%	0
Sat 7p	Clear	54°12° (likely 52°11° to 55°13°)	54°12°	0%	3 mph5 km/h from E, gusts 6 mph10 km/h	64%	14%	0
Sat 8p	Clear	51°11° (likely 49°9° to 52°11°)	51°11°	0%	2 mph3 km/h from E, gusts 7 mph11 km/h	71%	1%	0
Sat 9p	Clear	49°9° (likely 47°8° to 50°10°)	49°9°	0%	1 mph2 km/h from NE, gusts 6 mph10 km/h	80%	1%	0
Sat 10p	Clear	46°8° (likely 46°8° to 49°9°)	46°8°	0%	1 mph2 km/h from NE, gusts 5 mph8 km/h	86%	2%	0
Sat 11p	Clear	44°7° (likely 44°7° to 49°9°)	44°7°	0%	1 mph2 km/h from E, gusts 4 mph7 km/h	93%	6%	0
Sun 12a	Clear	44°7° (likely 44°7° to 48°9°)	44°7°	0%	0 mph0 km/h, gusts 4 mph6 km/h	93%	13%	0
Sun 1a	Clear	43°6° (likely 43°6° to 47°8°)	43°6°	0%	0 mph0 km/h, gusts 4 mph6 km/h	96%	12%	0
Sun 2a	Clear	41°5° (likely 41°5° to 46°8°)	41°5°	0%	0 mph0 km/h, gusts 4 mph6 km/h	100%	11%	0
Sun 3a	Clear	40°4° (likely 40°4° to 45°7°)	40°4°	0%	0 mph0 km/h, gusts 3 mph4 km/h	100%	10%	0
Sun 4a	Clear	40°4° (likely 40°4° to 44°7°)	40°4°	0%	0 mph0 km/h, gusts 3 mph5 km/h	100%	11%	0
Sun 5a	Clear	40°4° (likely 40°4° to 44°7°)	40°4°	0%	0 mph0 km/h, gusts 4 mph7 km/h	100%	1%	0
Sun 6a	Clear	39°4° (likely 39°4° to 43°6°)	39°4°	0%	0 mph0 km/h, gusts 3 mph5 km/h	100%	2%	0
Sun 7a	Sunny	39°4° (likely 39°4° to 43°6°)	39°4°	0%	0 mph0 km/h, gusts 3 mph4 km/h	100%	4%	0
Sun 8a	Sunny	39°4° (likely 38°3° to 43°6°)	39°4°	0%	0 mph0 km/h, gusts 3 mph5 km/h	100%	10%	0
Sun 9a	Mostly sunny	46°8° (likely 44°7° to 47°8°)	46°8°	0%	0 mph0 km/h, gusts 3 mph4 km/h	89%	13%	1
Sun 10a	Mostly sunny	53°12° (likely 52°11° to 54°12°)	53°12°	0%	1 mph2 km/h from N, gusts 6 mph9 km/h	71%	14%	2
Sun 11a	Mostly sunny	59°15° (likely 57°14° to 60°16°)	59°15°	0%	1 mph2 km/h from NE, gusts 6 mph9 km/h	60%	9%	3
Sun 12p	Sunny	61°16° (likely 60°16° to 62°17°)	61°16°	0%	1 mph2 km/h from E, gusts 5 mph9 km/h	56%	7%	4
Sun 1p	Sunny	65°18° (likely 62°17° to 65°18°)	65°18°	0%	1 mph2 km/h from E, gusts 5 mph7 km/h	46%	6%	4
Sun 2p	Mostly sunny	67°19° (likely 63°17° to 67°19°)	67°19°	0%	1 mph2 km/h from SE, gusts 5 mph8 km/h	43%	12%	4
Sun 3p	Sunny	67°19° (likely 64°18° to 67°19°)	67°19°	0%	1 mph2 km/h from SE, gusts 5 mph8 km/h	42%	8%	4
Sun 4p	Sunny	67°19° (likely 64°18° to 67°19°)	67°19°	0%	1 mph2 km/h from E, gusts 5 mph8 km/h	42%	8%	3
Sun 5p	Sunny	67°19° (likely 63°17° to 67°19°)	67°19°	0%	1 mph2 km/h from SE, gusts 5 mph7 km/h	42%	8%	1
Sun 6p	Clear	64°18° (likely 59°15° to 64°18°)	64°18°	0%	1 mph2 km/h from SE, gusts 6 mph9 km/h	48%	2%	0
Sun 7p	Clear	58°14° (likely 54°12° to 58°14°)	58°14°	0%	1 mph2 km/h from SE, gusts 5 mph7 km/h	62%	1%	0
Sun 8p	Clear	54°12° (likely 51°11° to 56°13°)	54°12°	0%	1 mph2 km/h from SE, gusts 3 mph5 km/h	74%	0%	0
Sun 9p	Clear	52°11° (likely 49°9° to 54°12°)	52°11°	0%	0 mph0 km/h, gusts 4 mph7 km/h	83%	0%	0
Sun 10p	Clear	49°9° (likely 47°8° to 51°11°)	49°9°	0%	0 mph0 km/h, gusts 4 mph7 km/h	89%	0%	0
Sun 11p	Clear	47°8° (likely 46°8° to 50°10°)	47°8°	0%	0 mph0 km/h, gusts 4 mph6 km/h	96%	0%	0
Mon 12a	Clear	46°8° (likely 45°7° to 48°9°)	46°8°	0%	0 mph0 km/h, gusts 4 mph6 km/h	96%	0%	0
Mon 1a	Clear	44°7° (likely 44°7° to 47°8°)	44°7°	0%	0 mph0 km/h, gusts 2 mph4 km/h	100%	0%	0
Mon 2a	Clear	44°7° (likely 42°6° to 46°8°)	44°7°	0%	0 mph0 km/h, gusts 2 mph3 km/h	100%	7%	0
Mon 3a	Clear	43°6° (likely 41°5° to 45°7°)	43°6°	0%	0 mph0 km/h, gusts 2 mph3 km/h	100%	13%	0
Mon 4a	Clear	43°6° (likely 40°4° to 44°7°)	43°6°	0%	1 mph2 km/h from W, gusts 3 mph4 km/h	100%	14%	0
Mon 5a	Clear	42°6° (likely 39°4° to 44°7°)	42°6°	0%	1 mph2 km/h from W, gusts 3 mph5 km/h	100%	13%	0
Mon 6a	Clear	40°4° (likely 39°4° to 44°7°)	40°4°	0%	1 mph2 km/h from W, gusts 3 mph5 km/h	100%	19%	0
Mon 7a	Mostly sunny	39°4° (likely 38°3° to 45°7°)	39°4°	0%	2 mph3 km/h from W, gusts 4 mph6 km/h	100%	29%	0
Mon 8a	Sunny	40°4° (likely 36°2° to 46°8°)	40°4°	0%	2 mph3 km/h from W, gusts 5 mph8 km/h	100%	25%	0
Mon 9a	Sunny	45°7° (likely 40°4° to 53°12°)	44°7°	0%	3 mph5 km/h from W, gusts 6 mph10 km/h	93%	25%	1

Days ahead

Shaded: typical range for these dates (1991–2020)

Today, Oct 24. Mostly sunny. High 64°18°, low 39°4°. Typical 66°19° / 49°9°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 57°14°
  Dry
2. Afternoon
  noon–6 PM
  Mostly sunny, 64°18°
  Dry
3. Evening
  6 PM–midnight
  Clear, 51°11°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 40°4°
  Dry
Official NWS forecast
Today: Sunny, with a high near 64. East wind around 5 mph.
Tonight: Patchy fog after 1am. Mostly clear, with a low around 39. Northeast wind 0 to 3 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
60°16°–64°18°
Low, likely
36°2°–40°4°
Typical high / low
66°19° / 49°9°
Wind
7 mph11 km/h, gusts 13 mph22 km/h
UV peak
4
Tomorrow, Oct 25. Sunny. High 67°19°, low 39°4°. Typical 66°19° / 49°9°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Mostly sunny, 39°4°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 67°19°
  Dry
3. Evening
  6 PM–midnight
  Clear, 54°12°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 42°6°
  Dry
Official NWS forecast
Day: Patchy fog before 9am. Sunny, with a high near 67. East wind around 1 mph.
Night: Clear, with a low around 39. West wind around 1 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
64°18°–67°19°
Low, likely
38°3°–42°6°
Typical high / low
66°19° / 49°9°
Wind
5 mph8 km/h
UV peak
4
Monday, Oct 26. Mostly sunny. High 70°21°, low 48°9°. Typical 66°19° / 48°9°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 40°4°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 68°20°
  Dry
3. Evening
  6 PM–midnight
  Clear, 56°13°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 51°10°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 70. West wind 1 to 6 mph.
Night: Clear, with a low around 48.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
67°19°–70°21°
Low, likely
36°2°–48°9°
Typical high / low
66°19° / 48°9°
Wind
7 mph12 km/h, gusts 14 mph23 km/h
UV peak
4
Tuesday, Oct 27. Mostly sunny. High 68°20°, low 45°7°. Typical 65°18° / 48°9°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 49°10°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 68°20°
  Dry
3. Evening
  6 PM–midnight
  Clear, 56°14°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 47°8°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 68.
Night: Mostly clear, with a low around 45.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
65°18°–70°21°
Low, likely
45°7°–52°11°
Typical high / low
65°18° / 48°9°
Wind
8 mph12 km/h, gusts 19 mph30 km/h
UV peak
4
Wednesday, Oct 28. Mostly cloudy. High 66°19°, low 47°8°. Typical 65°18° / 48°9°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Mostly sunny, 47°8°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 65°18°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 56°13°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 49°9°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Partly sunny, with a high near 66.
Night: Mostly cloudy, with a low around 47.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
63°17°–66°19°
Low, likely
42°6°–50°10°
Typical high / low
65°18° / 48°9°
Wind
7 mph12 km/h, gusts 17 mph28 km/h
UV peak
4
Thursday, Oct 29. Partly sunny. High 70°21°, low 49°9°. Typical 65°18° / 47°8°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 48°9°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 68°20°
  Dry
3. Evening
  6 PM–midnight
  Clear, 58°14°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 50°10°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 70.
Night: Mostly clear, with a low around 49.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
67°19°–70°21°
Low, likely
46°8°–50°10°
Typical high / low
65°18° / 47°8°
Wind
7 mph11 km/h, gusts 22 mph36 km/h
UV peak
4
Friday, Oct 30. Mostly sunny. High 73°23°, low 49°9°. Typical 64°18° / 47°8°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 49°9°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 74°23°
  Dry
3. Evening
  6 PM–midnight
  Clear, 62°16°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 48°9°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 73.
Night: Mostly clear, with a low around 49.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
73°23°–75°24°
Low, likely
45°7°–51°11°
Typical high / low
64°18° / 47°8°
Wind
9 mph14 km/h, gusts 26 mph41 km/h
UV peak
4
Saturday, Oct 31. Cloudy. High 70°21°, low 49°9°. Typical 64°18° / 46°8°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 47°8°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 69°21°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 61°16°
  Dry
4. Overnight
  midnight–6 AM
  Partly cloudy, 53°12°
  Dry
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
61°16°–75°24°
Low, likely
44°7°–52°11°
Typical high / low
64°18° / 46°8°
Wind
10 mph16 km/h, gusts 27 mph44 km/h
UV peak
3
Sunday, Nov 1. Cloudy. High 68°20°, low 52°11°. Typical 64°18° / 46°8°. Rain 0.02 in0.5 mm, 20% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Partly sunny, 52°11°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 67°19°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 60°16°
  20% chance
4. Overnight
  midnight–6 AM
  Cloudy, 56°13°
  20% chance · 0.02 in0.4 mm
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
57°14°–72°22°
Low, likely
47°8°–55°13°
Typical high / low
64°18° / 46°8°
Wind
8 mph13 km/h, gusts 21 mph34 km/h
UV peak
3
Monday, Nov 2. Cloudy. High 68°20°, low 56°13°. Typical 63°17° / 46°8°. Rain 0.09 in2.3 mm, 20% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 59°15°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 70°21°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 61°16°
  Dry
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
57°14°–76°24°
Low, likely
49°9°–59°15°
Typical high / low
63°17° / 46°8°
Wind
8 mph13 km/h, gusts 16 mph25 km/h
UV peak
1

10 days15 days30 days

The outlook

Today
Dry, high 64°, low 39°.
Tomorrow
Dry, high 67°, low 39°, warming up.
Monday
Dry, high 70°, low 48°, warming up.
Rest of week
Mostly dry, highs 66–73°.

Want the meteorologists’ reasoning? Read the NWS forecast discussion (LWX) (opens in a new tab)

What changed since yesterday

No meaningful changes from yesterday’s forecast.

Radar

Radar data: NOAA MRMS, rendered by forecast.blue

Radar loads when scrolled into view

Full-screen radar

Rivers

NOAA river gauges within 25 mi

Potomac River at Georgetown / Wisconsin Ave

7.1 mi

Below flood stage

Level: 4.7 ft

Forecast peak 5.6 ft Sat 7 PM, action stage

Reading from Sat 8:54 AM · NWS gauge page

Potomac River near Washington DC (Little Falls)

2.6 mi

Below flood stage

Level: 3.1 ft
Flow: 3,510 cfs

Forecast peak 3.0 ft Sat 2 PM

Reading from Sat 8:50 AM · NWS gauge page

Dead Run near McLean

1.2 mi

Below flood stage

Level: 1.1 ft
Flow: under 1 cfs

Reading from Sat 8:25 AM · NWS gauge page

Difficult Run near Great Falls

4.4 mi

Below flood stage

Level: 2.7 ft
Flow: 15 cfs

Reading from Sat 8:15 AM · NWS gauge page

For your home

What this week’s weather means for heating, cooling, pipes and fresh air.

Heating this week

About 53% less heating than a typical week.

This week 28Typical 59

Heating degree days, base 65°F

Heat-pump hours, next 7 days

h below 47°F: 23
h below 17°F: 0
h below 5°F: 0

47, 17 and 5°F are the test points heat pumps are rated at. About 11 hours are near freezing and damp, when outdoor units defrost more often.

Comfort

Dry air outside (dew point 45°F).

Open the windows?

Today, 1:00 PM–5:00 PM

Good stretch to open the windows.

Is this typical?

Washington Reagan National Airport · official normals 1991–2020 · records 1872–2026

Oct 24, today vs a typical year

Today’s expected high is 2°1° colder than typical.

Last 7 days vs normal

On average 2°1° colder than normal (daily mean temperature).

−7°−4°SunOct 18
−4°−2°MonOct 19
+1°±0°TueOct 20
±0°WedOct 21
−1°ThuOct 22
−1°FriOct 23
—SatOct 24

Cabin John weather by month: normals, records, snow and freeze dates

Sun & moon

Sun

Daylight: 10 h 50 min; Losing 2 min 25 s a day; shortest Dec 21, 1 h 24 min less
Golden hour: 5:40–6:34 PM; Morning 7:10–8:04 AM
Blue hour: 6:34–6:44 PM; Morning 7:00–7:10 AM; first light 7:00 AM

Stars tonight? Fair

Clear 6:44 PM–7:01 AM, but the moon is 99% lit and up.

Moon

Waxing gibbous

97% lit · growing

Today: sets 5:40 AM · rises 5:14 PM
Full moon: Oct 26
New moon: Nov 9

Looking southwest from Cabin John. The highest point on the skyline is about 3,000 ft, 13 mi away.Skyline from USGS elevation data, heights drawn up to 6× taller. Sky, sun and moon as they are now.

Cabin John, MD weather

Next 2 hours

Next 48 hours

Days ahead

The outlook

Today

Tomorrow

Monday

Rest of week

What changed since yesterday

Radar

Rivers

Potomac River at Georgetown / Wisconsin Ave

Potomac River near Washington DC (Little Falls)

Dead Run near McLean

Difficult Run near Great Falls

For your home

Heating this week

Heat-pump hours, next 7 days

Comfort

Open the windows?

Is this typical?

Oct 24, today vs a typical year

Last 7 days vs normal

Sun & moon

Sun

Stars tonight? Fair

Moon