Observed 3:15 PM EDT at KCGS

Adelphi, MD weather

Partly cloudy and 64°18°, jacket by 8 PM.

Mostly agree

Now 64°18°

Partly sunny

Wind: 8 mph13 km/h; From the east. Up to 8 mph13 km/h through 4 AM
Dew point: 40°5°; Comfortable
UV tomorrow: 4Moderate; Moderate 11 AM–5 PM · peak 4
Air quality: 34Good; Ozone · tomorrow moderate
Pressure: 30.52 inHg1034 hPa; Falling · −0.05 inHg−1.8 hPa in 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

About the same as this time yesterday (62°17° then, 64°18° now)

Good hours for

Below 50°10° tonight after 9 PM
Low 40°4° tomorrow at 7 AM
Above 50°10° tomorrow by 10 AM

This afternoonNear 63°17° · Clear
TonightDown to 41°5° by 4 AM · Clear
Tomorrow morningUp to 57°14° by 11 AM · Clear
Tomorrow afternoonUp to 66°19° by 4 PM · Clear
Tomorrow nightDown to 41°5° by 4 AM · Clear
Monday morningUp to 58°14° by 11 AM · Clear
Monday afternoonUp to 69°21° by 3 PM · 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 4p	Sunny	63°17° (likely 60°16° to 63°17°)	63°17°	0%	5 mph8 km/h from E, gusts 8 mph13 km/h	43%	15%	1
Sat 5p	Sunny	62°17° (likely 59°15° to 62°17°)	62°17°	0%	5 mph8 km/h from E, gusts 8 mph13 km/h	44%	14%	1
Sat 6p	Clear	59°15° (likely 56°13° to 59°15°)	59°15°	0%	5 mph8 km/h from E, gusts 9 mph15 km/h	49%	16%	0
Sat 7p	Clear	56°13° (likely 53°12° to 56°13°)	56°13°	0%	3 mph5 km/h from E, gusts 6 mph9 km/h	57%	13%	0
Sat 8p	Clear	50°10° (likely 50°10° to 52°11°)	49°9°	0%	3 mph5 km/h from E, gusts 6 mph10 km/h	74%	3%	0
Sat 9p	Clear	48°9° (likely 48°9° to 50°10°)	48°9°	0%	2 mph3 km/h from NE, gusts 6 mph10 km/h	80%	10%	0
Sat 10p	Clear	47°8° (likely 47°8° to 49°9°)	47°8°	0%	2 mph3 km/h from NE, gusts 4 mph7 km/h	83%	16%	0
Sat 11p	Clear	46°8° (likely 46°8° to 48°9°)	46°8°	0%	2 mph3 km/h from NE, gusts 5 mph8 km/h	86%	15%	0
Sun 12a	Clear	44°7° (likely 44°7° to 48°9°)	44°7°	0%	2 mph3 km/h from NE, gusts 4 mph7 km/h	93%	14%	0
Sun 1a	Clear	43°6° (likely 43°6° to 47°8°)	43°6°	0%	1 mph2 km/h from NE, gusts 4 mph7 km/h	96%	14%	0
Sun 2a	Clear	43°6° (likely 43°6° to 46°8°)	43°6°	0%	1 mph2 km/h from N, gusts 5 mph8 km/h	96%	7%	0
Sun 3a	Clear	43°6° (likely 42°6° to 45°7°)	43°6°	0%	1 mph2 km/h from N, gusts 5 mph8 km/h	96%	2%	0
Sun 4a	Clear	41°5° (likely 41°5° to 44°7°)	41°5°	0%	1 mph2 km/h from N, gusts 5 mph8 km/h	100%	7%	0
Sun 5a	Clear	41°5° (likely 41°5° to 44°7°)	41°5°	0%	2 mph3 km/h from N, gusts 5 mph8 km/h	100%	8%	0
Sun 6a	Clear	41°5° (likely 40°4° to 43°6°)	41°5°	0%	2 mph3 km/h from N, gusts 6 mph9 km/h	100%	8%	0
Sun 7a	Sunny	40°4° (likely 39°4° to 43°6°)	40°4°	0%	2 mph3 km/h from N, gusts 6 mph10 km/h	100%	11%	0
Sun 8a	Sunny	41°5° (likely 39°4° to 43°6°)	41°5°	0%	2 mph3 km/h from N, gusts 6 mph10 km/h	100%	11%	0
Sun 9a	Sunny	45°7° (likely 45°7° to 48°9°)	45°7°	0%	1 mph2 km/h from N, gusts 6 mph9 km/h	93%	3%	1
Sun 10a	Sunny	52°11° (likely 52°11° to 54°12°)	52°11°	0%	1 mph2 km/h from NE, gusts 6 mph10 km/h	74%	2%	2
Sun 11a	Sunny	57°14° (likely 57°14° to 59°15°)	57°14°	0%	2 mph3 km/h from E, gusts 6 mph9 km/h	64%	4%	3
Sun 12p	Sunny	59°15° (likely 59°15° to 62°17°)	59°15°	0%	2 mph3 km/h from E, gusts 5 mph7 km/h	57%	5%	4
Sun 1p	Sunny	63°17° (likely 62°17° to 64°18°)	63°17°	0%	2 mph3 km/h from E, gusts 4 mph6 km/h	48%	4%	4
Sun 2p	Sunny	64°18° (likely 63°17° to 65°18°)	64°18°	0%	2 mph3 km/h from E, gusts 4 mph6 km/h	46%	4%	4
Sun 3p	Sunny	65°18° (likely 64°18° to 66°19°)	65°18°	0%	2 mph3 km/h from SE, gusts 6 mph10 km/h	43%	8%	4
Sun 4p	Sunny	66°19° (likely 64°18° to 66°19°)	66°19°	0%	2 mph3 km/h from SE, gusts 5 mph8 km/h	42%	6%	3
Sun 5p	Sunny	66°19° (likely 63°17° to 66°19°)	66°19°	0%	2 mph3 km/h from SE, gusts 5 mph8 km/h	42%	2%	1
Sun 6p	Clear	63°17° (likely 59°15° to 63°17°)	63°17°	0%	2 mph3 km/h from SE, gusts 5 mph8 km/h	48%	0%	0
Sun 7p	Clear	59°15° (likely 55°13° to 59°15°)	59°15°	0%	2 mph3 km/h from E, gusts 6 mph9 km/h	57%	1%	0
Sun 8p	Clear	55°13° (likely 52°11° to 55°13°)	55°13°	0%	2 mph3 km/h from NE, gusts 5 mph8 km/h	69%	2%	0
Sun 9p	Clear	50°10° (likely 50°10° to 53°12°)	50°10°	0%	1 mph2 km/h from E, gusts 4 mph7 km/h	83%	0%	0
Sun 10p	Clear	48°9° (likely 48°9° to 52°11°)	48°9°	0%	0 mph0 km/h, gusts 3 mph5 km/h	86%	0%	0
Sun 11p	Clear	46°8° (likely 46°8° to 50°10°)	46°8°	0%	0 mph0 km/h, gusts 2 mph4 km/h	93%	0%	0
Mon 12a	Clear	45°7° (likely 45°7° to 49°9°)	45°7°	0%	0 mph0 km/h, gusts 2 mph3 km/h	96%	0%	0
Mon 1a	Clear	44°7° (likely 44°7° to 48°9°)	44°7°	0%	1 mph2 km/h from W, gusts 2 mph4 km/h	100%	0%	0
Mon 2a	Clear	42°6° (likely 42°6° to 47°8°)	42°6°	0%	1 mph2 km/h from W, gusts 3 mph5 km/h	100%	0%	0
Mon 3a	Clear	42°6° (likely 42°6° to 46°8°)	42°6°	0%	1 mph2 km/h from W, gusts 3 mph5 km/h	100%	0%	0
Mon 4a	Clear	41°5° (likely 41°5° to 45°7°)	41°5°	0%	2 mph3 km/h from W, gusts 4 mph7 km/h	100%	0%	0
Mon 5a	Clear	41°5° (likely 41°5° to 44°7°)	41°5°	0%	2 mph3 km/h from W, gusts 4 mph7 km/h	100%	11%	0
Mon 6a	Clear	40°4° (likely 40°4° to 44°7°)	40°4°	0%	2 mph3 km/h from W, gusts 6 mph10 km/h	100%	11%	0
Mon 7a	Sunny	40°4° (likely 40°4° to 43°6°)	40°4°	0%	2 mph3 km/h from W, gusts 4 mph7 km/h	100%	15%	0
Mon 8a	Sunny	40°4° (likely 39°4° to 44°7°)	38°3°	0%	3 mph5 km/h from W, gusts 4 mph6 km/h	100%	22%	0
Mon 9a	Sunny	45°7° (likely 43°6° to 48°9°)	44°7°	0%	3 mph5 km/h from W, gusts 5 mph8 km/h	96%	17%	1
Mon 10a	Sunny	51°11° (likely 51°11° to 55°13°)	51°11°	0%	3 mph5 km/h from W, gusts 9 mph14 km/h	80%	13%	2
Mon 11a	Sunny	58°14° (likely 58°14° to 59°15°)	58°14°	0%	5 mph8 km/h from W, gusts 11 mph17 km/h	67%	0%	3
Mon 12p	Sunny	63°17° (likely 62°17° to 63°17°)	63°17°	0%	5 mph8 km/h from W, gusts 10 mph16 km/h	56%	0%	4
Mon 1p	Sunny	66°19° (likely 65°18° to 66°19°)	66°19°	0%	6 mph10 km/h from NW, gusts 10 mph16 km/h	48%	0%	4
Mon 2p	Sunny	68°20° (likely 67°19° to 68°20°)	68°20°	0%	6 mph10 km/h from NW, gusts 10 mph16 km/h	45%	0%	4
Mon 3p	Sunny	69°21° (likely 68°20° to 69°21°)	69°21°	0%	6 mph10 km/h from NW, gusts 11 mph18 km/h	44%	0%	4

Days ahead

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

Today, Oct 24. Mostly sunny. High 63°17°, low 40°4°. Typical 66°19° / 49°9°. Dry. Mostly agree.
1. Afternoon
  noon–6 PM
  Sunny, 63°17°
  Dry
2. Evening
  6 PM–midnight
  Clear, 50°10°
  Dry
3. Overnight
  midnight–6 AM
  Clear, 41°5°
  Dry
Official NWS forecast
Today: Sunny, with a high near 63. East wind around 5 mph.
Tonight: Mostly clear, with a low around 40. Northeast wind 1 to 5 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
60°16°–64°18°
Low, likely
38°3°–40°4°
Typical high / low
66°19° / 49°9°
Wind
7 mph12 km/h, gusts 13 mph21 km/h
UV peak
4
Tomorrow, Oct 25. Sunny. High 66°19°, low 40°4°. Typical 66°19° / 49°9°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 41°5°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 66°19°
  Dry
3. Evening
  6 PM–midnight
  Clear, 55°13°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 41°5°
  Dry
Official NWS forecast
Day: Sunny, with a high near 66. Northeast wind around 2 mph.
Night: Clear, with a low around 40. Northeast wind around 2 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
64°18°–66°19°
Low, likely
39°4°–43°6°
Typical high / low
66°19° / 49°9°
Wind
6 mph9 km/h
UV peak
4
Monday, Oct 26. Mostly sunny. High 70°21°, low 50°10°. Typical 66°19° / 48°9°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 40°4°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 69°21°
  Dry
3. Evening
  6 PM–midnight
  Clear, 57°14°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 51°11°
  Dry
Official NWS forecast
Day: Sunny, with a high near 70. West wind 2 to 6 mph.
Night: Mostly clear, with a low around 50.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
68°20°–70°21°
Low, likely
39°4°–50°10°
Typical high / low
66°19° / 48°9°
Wind
6 mph10 km/h, gusts 15 mph24 km/h
UV peak
4
Tuesday, Oct 27. Mostly sunny. High 68°20°, low 47°8°. Typical 65°18° / 48°9°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 50°10°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 68°20°
  Dry
3. Evening
  6 PM–midnight
  Clear, 57°14°
  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 68.
Night: Mostly clear, with a low around 47.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
65°18°–70°21°
Low, likely
47°8°–53°12°
Typical high / low
65°18° / 48°9°
Wind
7 mph12 km/h, gusts 20 mph32 km/h
UV peak
4
Wednesday, Oct 28. Cloudy. High 66°19°, low 49°9°. Typical 65°18° / 48°9°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 47°8°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 64°18°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 56°13°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 49°10°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 66.
Night: Mostly cloudy, with a low around 49.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
63°17°–66°19°
Low, likely
43°6°–49°9°
Typical high / low
65°18° / 48°9°
Wind
7 mph11 km/h, gusts 16 mph25 km/h
UV peak
4
Thursday, Oct 29. Partly sunny. High 70°21°, low 50°10°. Typical 65°18° / 47°8°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 49°9°
  Dry
2. Afternoon
  noon–6 PM
  Mostly sunny, 68°20°
  Dry
3. Evening
  6 PM–midnight
  Clear, 59°15°
  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 50.
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
6 mph10 km/h, gusts 22 mph35 km/h
UV peak
4
Friday, Oct 30. Mostly sunny. High 74°23°, low 52°11°. Typical 64°18° / 47°8°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 49°9°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 75°24°
  Dry
3. Evening
  6 PM–midnight
  Clear, 63°17°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 52°11°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 74.
Night: Mostly clear, with a low around 52.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
74°23°–75°24°
Low, likely
45°7°–52°11°
Typical high / low
64°18° / 47°8°
Wind
6 mph9 km/h, gusts 24 mph38 km/h
UV peak
4
Saturday, Oct 31. Cloudy. High 72°22°, low 51°11°. Typical 64°18° / 46°8°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Mostly sunny, 51°10°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 73°23°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 62°17°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 55°13°
  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.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
69°21°–74°23°
Low, likely
46°8°–56°13°
Typical high / low
64°18° / 46°8°
Wind
7 mph11 km/h, gusts 26 mph41 km/h
UV peak
4
Sunday, Nov 1. Cloudy. High 71°22°, low 55°13°. Typical 64°18° / 46°8°. Rain 0.02 in0.5 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 56°13°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 70°21°
  20% chance
3. Evening
  6 PM–midnight
  Cloudy, 65°19°
  20% chance
4. Overnight
  midnight–6 AM
  Drizzle, 63°17°
  20% chance · 0.05 in1.3 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
65°18°–75°24°
Low, likely
54°12°–55°13°
Typical high / low
64°18° / 46°8°
Wind
9 mph14 km/h, gusts 21 mph33 km/h
UV peak
2
Monday, Nov 2. Drizzle. High 73°23°, low 61°16°. Typical 63°17° / 46°8°. Rain 0.16 in4.1 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Drizzle, 65°18°
  20% chance · 0.02 in0.5 mm
2. Afternoon
  noon–6 PM
  Cloudy, 73°23°
  Dry
3. Evening
  6 PM–midnight
  Drizzle, 67°20°
  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
64°18°–79°26°
Low, likely
58°14°–69°21°
Typical high / low
63°17° / 46°8°
Wind
15 mph25 km/h, gusts 36 mph58 km/h

10 days15 days30 days

The outlook

Today
Dry, high 63°, low 40°.
Tomorrow
Dry, high 66°, low 40°, warming up.
Monday
Dry, high 70°, low 50°, warming up.
Rest of week
Mostly dry, highs 66–74°.

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

Sligo Creek near Chillum / Riggs Rd.

1.9 mi

Below flood stage

Level: 0.2 ft

Reading from Sat 2:40 PM · NWS gauge page

Sligo Creek near Takoma Park

2.2 mi

Below flood stage

Level: 0.6 ft
Flow: 1 cfs

Reading from Sat 3:15 PM · NWS gauge page

Paint Branch near Hillandale / Powder Mill Road

2.5 mi

Level: 0.8 ft

Reading from Sat 1:40 PM · NWS gauge page

Paint Branch near White Oak

2.5 mi

Below flood stage

Level: 1.5 ft
Flow: 2 cfs

Reading from Sat 2:35 PM · NWS gauge page

For your home

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

Heating this week

About 52% 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 12 hours are near freezing and damp, when outdoor units defrost more often.

Comfort

Dry air outside (dew point 40°F).

Open the windows?

Sun, 1:00 PM–6:00 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 3°2° 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

Adelphi weather by month: normals, records, snow and freeze dates

Sun & moon

Sun

Daylight: 10 h 50 min; Losing 2 min 21 s a day; shortest Dec 21, 1 h 24 min less
Golden hour: 5:39–6:33 PM; Morning 7:09–8:03 AM
Blue hour: 6:33–6:44 PM; Morning 6:59–7:09 AM; first light 6:59 AM

Stars tonight? Fair

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

Moon

Waxing gibbous

98% lit · growing

Today: sets 5:39 AM · rises 5:13 PM
Full moon: Oct 26
New moon: Nov 9

Looking west from Adelphi. The highest point on the skyline is about 2,500 ft, 22 mi away.Skyline from USGS elevation data, heights drawn up to 6× taller. Sky, sun and moon as they are now.

Adelphi, MD weather

Next 2 hours

Next 48 hours

Days ahead

The outlook

Today

Tomorrow

Monday

Rest of week

What changed since yesterday

Radar

Rivers

Sligo Creek near Chillum / Riggs Rd.

Sligo Creek near Takoma Park

Paint Branch near Hillandale / Powder Mill Road

Paint Branch near White Oak

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