Observed 7:50 AM EDT at KGAI

Derwood, MD weather

Foggy and 36°2°.

Forecasts agree

Now 36°2°

Fog

Wind: Calm; Up to 5 mph8 km/h through 8 PM
Dew point: 36°2°; Comfortable
Humidity: 100%; Air 36°2°, dew point 36°2° · frost likely
UV index: 0Low; Moderate 11 AM–5 PM · peak 4
Air quality: 52Moderate; Main pollutant: PM2.5 (fine particles)
Pressure: 30.53 inHg1034 hPa; Rising slowly · +0.03 inHg+1.1 hPa in 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

Good hours for

Above 50°10° today by 10 AM
High 62°17° today at 2 PM
Below 50°10° tonight after 8 PM

This morningUp to 56°13° by 11 AM · Clear
This afternoonNear 60°16° · Clear
TonightDown to 38°3° by 5 AM · Clear
Tomorrow morningUp to 57°14° by 11 AM · Clear
Tomorrow afternoonUp to 65°18° by 2 PM · Clear
Tomorrow nightDown to 41°5° by 4 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 8a	Mostly sunny	38°3° (likely 35°2° to 42°6°)	38°3°	0%	2 mph3 km/h from NE, gusts 6 mph9 km/h	96%	31%	0
Sat 9a	Sunny	43°6° (likely 41°5° to 46°8°)	43°6°	0%	2 mph3 km/h from NE, gusts 6 mph10 km/h	86%	16%	1
Sat 10a	Sunny	50°10° (likely 49°9° to 52°11°)	50°10°	0%	2 mph3 km/h from NE, gusts 6 mph10 km/h	71%	0%	2
Sat 11a	Sunny	56°13° (likely 55°13° to 56°13°)	56°13°	0%	3 mph5 km/h from E, gusts 11 mph18 km/h	57%	0%	3
Sat 12p	Sunny	59°15° (likely 57°14° to 59°15°)	59°15°	0%	3 mph5 km/h from E, gusts 10 mph16 km/h	51%	7%	4
Sat 1p	Sunny	61°16° (likely 59°15° to 61°16°)	61°16°	0%	3 mph5 km/h from SE, gusts 9 mph14 km/h	46%	9%	4
Sat 2p	Sunny	62°17° (likely 60°16° to 62°17°)	62°17°	0%	3 mph5 km/h from E, gusts 8 mph13 km/h	43%	6%	4
Sat 3p	Sunny	62°17° (likely 60°16° to 62°17°)	62°17°	0%	3 mph5 km/h from E, gusts 8 mph13 km/h	43%	9%	4
Sat 4p	Sunny	62°17° (likely 60°16° to 62°17°)	62°17°	0%	3 mph5 km/h from E, gusts 7 mph12 km/h	43%	12%	3
Sat 5p	Sunny	61°16° (likely 59°15° to 61°16°)	61°16°	0%	5 mph8 km/h from E, gusts 8 mph13 km/h	46%	11%	1
Sat 6p	Clear	57°14° (likely 56°13° to 58°14°)	57°14°	0%	3 mph5 km/h from E, gusts 8 mph13 km/h	53%	7%	0
Sat 7p	Clear	51°11° (likely 51°11° to 54°12°)	51°11°	0%	3 mph5 km/h from E, gusts 7 mph11 km/h	68%	6%	0
Sat 8p	Clear	48°9° (likely 48°9° to 51°11°)	48°9°	0%	2 mph3 km/h from E, gusts 7 mph11 km/h	77%	1%	0
Sat 9p	Clear	45°7° (likely 45°7° to 49°9°)	45°7°	0%	1 mph2 km/h from E, gusts 7 mph11 km/h	86%	1%	0
Sat 10p	Clear	44°7° (likely 44°7° to 48°9°)	44°7°	0%	1 mph2 km/h from E, gusts 6 mph9 km/h	86%	2%	0
Sat 11p	Clear	43°6° (likely 43°6° to 47°8°)	43°6°	0%	1 mph2 km/h from E, gusts 5 mph9 km/h	89%	4%	0
Sun 12a	Clear	42°6° (likely 42°6° to 46°8°)	42°6°	0%	1 mph2 km/h from NE, gusts 5 mph9 km/h	93%	13%	0
Sun 1a	Clear	42°6° (likely 42°6° to 46°8°)	42°6°	0%	1 mph2 km/h from NE, gusts 5 mph8 km/h	93%	11%	0
Sun 2a	Clear	41°5° (likely 41°5° to 45°7°)	41°5°	0%	1 mph2 km/h from NE, gusts 5 mph8 km/h	100%	8%	0
Sun 3a	Clear	39°4° (likely 39°4° to 44°7°)	39°4°	0%	0 mph0 km/h, gusts 4 mph7 km/h	100%	3%	0
Sun 4a	Clear	39°4° (likely 39°4° to 44°7°)	39°4°	0%	0 mph0 km/h, gusts 5 mph7 km/h	100%	1%	0
Sun 5a	Clear	38°3° (likely 38°3° to 43°6°)	38°3°	0%	1 mph2 km/h from NE, gusts 5 mph8 km/h	100%	2%	0
Sun 6a	Clear	38°3° (likely 38°3° to 43°6°)	38°3°	0%	1 mph2 km/h from NE, gusts 5 mph9 km/h	100%	3%	0
Sun 7a	Sunny	37°3° (likely 37°3° to 42°6°)	37°3°	0%	1 mph2 km/h from NE, gusts 6 mph10 km/h	100%	4%	0
Sun 8a	Sunny	38°3° (likely 38°3° to 42°6°)	38°3°	0%	1 mph2 km/h from NE, gusts 6 mph10 km/h	100%	7%	0
Sun 9a	Sunny	45°7° (likely 43°6° to 47°8°)	45°7°	0%	1 mph2 km/h from NE, gusts 6 mph9 km/h	86%	4%	1
Sun 10a	Mostly sunny	52°11° (likely 52°11° to 53°12°)	52°11°	0%	0 mph0 km/h, gusts 6 mph9 km/h	71%	13%	2
Sun 11a	Sunny	57°14° (likely 56°13° to 58°14°)	57°14°	0%	1 mph2 km/h from E, gusts 6 mph10 km/h	62%	14%	3
Sun 12p	Sunny	60°16° (likely 58°14° to 61°16°)	60°16°	0%	1 mph2 km/h from E, gusts 6 mph9 km/h	55%	14%	4
Sun 1p	Sunny	63°17° (likely 60°16° to 63°17°)	63°17°	0%	1 mph2 km/h from S, gusts 6 mph9 km/h	48%	11%	4
Sun 2p	Sunny	65°18° (likely 61°16° to 65°18°)	65°18°	0%	1 mph2 km/h from S, gusts 5 mph8 km/h	43%	16%	4
Sun 3p	Sunny	65°18° (likely 61°16° to 65°18°)	65°18°	0%	1 mph2 km/h from S, gusts 5 mph8 km/h	43%	16%	4
Sun 4p	Sunny	65°18° (likely 62°17° to 65°18°)	65°18°	0%	1 mph2 km/h from SE, gusts 5 mph8 km/h	43%	8%	3
Sun 5p	Sunny	65°18° (likely 61°16° to 65°18°)	65°18°	0%	1 mph2 km/h from SE, gusts 5 mph8 km/h	43%	6%	1
Sun 6p	Clear	61°16° (likely 58°14° to 61°16°)	61°16°	0%	1 mph2 km/h from SE, gusts 4 mph7 km/h	51%	4%	0
Sun 7p	Clear	55°13° (likely 54°12° to 56°13°)	55°13°	0%	1 mph2 km/h from E, gusts 4 mph6 km/h	66%	3%	0
Sun 8p	Clear	52°11° (likely 51°11° to 54°12°)	52°11°	0%	0 mph0 km/h, gusts 3 mph5 km/h	77%	1%	0
Sun 9p	Clear	49°9° (likely 49°9° to 53°12°)	49°9°	0%	0 mph0 km/h, gusts 3 mph6 km/h	86%	0%	0
Sun 10p	Clear	47°8° (likely 47°8° to 50°10°)	47°8°	0%	0 mph0 km/h, gusts 4 mph7 km/h	93%	0%	0
Sun 11p	Clear	45°7° (likely 45°7° to 49°9°)	45°7°	0%	0 mph0 km/h, gusts 4 mph7 km/h	96%	0%	0
Mon 12a	Clear	43°6° (likely 43°6° to 47°8°)	43°6°	0%	0 mph0 km/h, gusts 4 mph6 km/h	100%	0%	0
Mon 1a	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 2a	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 3a	Clear	42°6° (likely 40°4° to 47°8°)	42°6°	0%	1 mph2 km/h from W, gusts 3 mph5 km/h	100%	0%	0
Mon 4a	Clear	41°5° (likely 39°4° to 46°8°)	41°5°	0%	2 mph3 km/h from W, gusts 4 mph6 km/h	100%	9%	0
Mon 5a	Clear	41°5° (likely 38°3° to 46°8°)	41°5°	0%	2 mph3 km/h from W, gusts 4 mph6 km/h	100%	14%	0
Mon 6a	Clear	39°4° (likely 37°3° to 46°8°)	39°4°	0%	2 mph3 km/h from W, gusts 4 mph6 km/h	100%	15%	0
Mon 7a	Sunny	38°3° (likely 37°3° to 45°7°)	38°3°	0%	2 mph3 km/h from W, gusts 4 mph6 km/h	100%	26%	0

Days ahead

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

Today, Oct 24. Sunny. High 62°17°, low 37°3°. Typical 65°18° / 44°7°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 38°3°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 62°17°
  Dry
3. Evening
  6 PM–midnight
  Clear, 48°9°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 38°3°
  Dry
Official NWS forecast
Today: Sunny, with a high near 62. East wind around 5 mph.
Tonight: Patchy fog after 2am. Clear, with a low around 37. East wind 0 to 3 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
60°16°–62°17°
Low, likely
35°2°–41°5°
Typical high / low
65°18° / 44°7°
Wind
6 mph10 km/h, gusts 14 mph22 km/h
UV peak
4
Tomorrow, Oct 25. Sunny. High 65°18°, low 38°3°. Typical 65°18° / 43°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 38°3°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 65°18°
  Dry
3. Evening
  6 PM–midnight
  Clear, 52°11°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 41°5°
  Dry
Official NWS forecast
Day: Patchy fog before 7am, then patchy frost and patchy fog between 7am and 9am. Sunny, with a high near 65. East wind around 1 mph.
Night: Clear, with a low around 38. Southeast wind around 2 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
62°17°–65°18°
Low, likely
37°3°–41°5°
Typical high / low
65°18° / 43°6°
Wind
6 mph9 km/h
UV peak
4
Monday, Oct 26. Mostly sunny. High 68°20°, low 48°9°. Typical 64°18° / 43°6°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 41°5°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 67°19°
  Dry
3. Evening
  6 PM–midnight
  Clear, 55°13°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 49°9°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 68. West wind 2 to 6 mph.
Night: Mostly clear, with a low around 48.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
66°19°–68°20°
Low, likely
37°3°–48°9°
Typical high / low
64°18° / 43°6°
Wind
8 mph12 km/h, gusts 14 mph23 km/h
UV peak
4
Tuesday, Oct 27. Mostly sunny. High 66°19°, low 44°7°. Typical 64°18° / 42°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 47°9°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 66°19°
  Dry
3. Evening
  6 PM–midnight
  Clear, 55°13°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 46°8°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 66.
Night: Partly cloudy, with a low around 44.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
64°18°–69°21°
Low, likely
44°7°–49°9°
Typical high / low
64°18° / 42°6°
Wind
9 mph14 km/h, gusts 19 mph30 km/h
UV peak
4
Wednesday, Oct 28. Mostly cloudy. High 64°18°, low 47°8°. Typical 64°18° / 42°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Mostly sunny, 46°8°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 63°17°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 54°12°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 47°8°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Partly sunny, with a high near 64.
Night: Mostly cloudy, with a low around 47.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
62°17°–64°18°
Low, likely
42°6°–48°9°
Typical high / low
64°18° / 42°6°
Wind
7 mph12 km/h, gusts 17 mph28 km/h
UV peak
4
Thursday, Oct 29. Partly sunny. High 69°21°, low 49°9°. Typical 63°17° / 42°6°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 47°8°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 67°19°
  Dry
3. Evening
  6 PM–midnight
  Clear, 56°13°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 49°9°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 69.
Night: Mostly clear, with a low around 49.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
65°18°–69°21°
Low, likely
45°7°–49°9°
Typical high / low
63°17° / 42°6°
Wind
6 mph10 km/h, gusts 22 mph36 km/h
UV peak
4
Friday, Oct 30. Mostly sunny. High 71°22°, low 48°9°. Typical 63°17° / 41°5°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 48°9°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 73°23°
  Dry
3. Evening
  6 PM–midnight
  Clear, 60°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 71.
Night: Mostly clear, with a low around 48.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
71°22°–74°23°
Low, likely
45°7°–48°9°
Typical high / low
63°17° / 41°5°
Wind
9 mph15 km/h, gusts 26 mph41 km/h
UV peak
4
Saturday, Oct 31. Cloudy. High 69°21°, low 47°8°. Typical 62°17° / 41°5°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 46°8°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 68°20°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 60°15°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 51°11°
  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
60°16°–74°23°
Low, likely
44°7°–50°10°
Typical high / low
62°17° / 41°5°
Wind
10 mph17 km/h, gusts 27 mph44 km/h
UV peak
3
Sunday, Nov 1. Cloudy. High 67°19°, low 51°11°. Typical 62°17° / 41°5°. Rain 0.01 in0.3 mm, 20% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 51°10°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 66°19°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 58°14°
  20% chance
4. Overnight
  midnight–6 AM
  Cloudy, 54°12°
  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
55°13°–71°22°
Low, likely
44°7°–54°12°
Typical high / low
62°17° / 41°5°
Wind
8 mph13 km/h, gusts 21 mph34 km/h
UV peak
3
Monday, Nov 2. Cloudy. High 68°20°, low 54°12°. Typical 62°17° / 40°4°. Rain 0.05 in1.3 mm, 20% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 58°14°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 68°20°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 59°15°
  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
56°13°–75°24°
Low, likely
46°8°–58°14°
Typical high / low
62°17° / 40°4°
Wind
8 mph12 km/h, gusts 16 mph25 km/h
UV peak
1

10 days15 days30 days

The outlook

Today
Dry, high 62°, low 37°.
Tomorrow
Dry, high 65°, low 38°, warming up.
Monday
Dry, high 68°, low 48°, warming up.
Rest of week
Mostly dry, highs 64–71°.

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

Seneca Creek at Dawsonville

10 mi

Below flood stage

Level: 2.0 ft
Flow: 52 cfs

Forecast peak 2.0 ft Sat 8 AM

Reading from Sat 6:50 AM · NWS gauge page

Turkey Branch near Aspen Hill

4.9 mi

Below flood stage

Level: 4.3 ft
Flow: under 1 cfs

Reading from Sat 6:45 AM · NWS gauge page

Northwest Branch at Kemp Mill

7.3 mi

Below flood stage

Level: 1.4 ft
Flow: 2 cfs

Reading from Sat 5:45 AM · NWS gauge page

Hawlings River near Sandy Spring

8.1 mi

Below flood stage

Level: 0.5 ft
Flow: 5 cfs

Reading from Sat 5:45 AM · NWS gauge page

For your home

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

Heating this week

About 64% less heating than a typical week.

This week 30Typical 83

Heating degree days, base 65°F

Heat-pump hours, next 7 days

h below 47°F: 24
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 16 hours are near freezing and damp, when outdoor units defrost more often.

Comfort

Dry air outside (dew point 36°F).

Open the windows?

Today, 1:00 PM–5:00 PM

Good stretch to open the windows.

Is this typical?

BELTSVILLE · official normals 1991–2020 · records 1941–2026

Oct 24, today vs a typical year

Today’s expected high is 3°2° colder than typical.

Last 7 days vs normal

—SunOct 18
—MonOct 19
—TueOct 20
—WedOct 21
—ThuOct 22
—FriOct 23
—SatOct 24

Derwood 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 25 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

96% lit · growing

Today: sets 5:40 AM · rises 5:13 PM
Full moon: Oct 26
New moon: Nov 9

Looking west from Derwood. The highest point on the skyline is about 2,500 ft, 34 mi away.Skyline from USGS elevation data, heights drawn up to 6× taller. Sky, sun and moon as they are now.

Derwood, MD weather

Next 2 hours

Next 48 hours

Days ahead

The outlook

Today

Tomorrow

Monday

Rest of week

What changed since yesterday

Radar

Rivers

Seneca Creek at Dawsonville

Turkey Branch near Aspen Hill

Northwest Branch at Kemp Mill

Hawlings River near Sandy Spring

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