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Pacific Storm System Across the West; Fire Weather Concerns in the Southeast

A Pacific storm system will bring strong winds and low elevation rain to much of the West Coast, and heavy high elevation mountain snow to the Sierra-Nevada through Wednesday. Fire weather concerns will continue into Tuesday across the Mid-South and Southeast as gusty winds and dry conditions persist. Read More >

Hazardous Weather Conditions

Current conditions at

Gaithersburg - Montgomery County Airport (KGAI)

Lat: 39.17°NLon: 77.17°WElev: 495ft.

Fair

25°F

-4°C

Humidity 92%
Wind Speed Calm
Barometer 30.38 in (1030.7 mb)
Dewpoint 23°F (-5°C)
Visibility 10.00 mi
Last update 21 Apr 5:56 am EDT
Extended Forecast for

Derwood MD

Freeze Warning until April 21, 10:00am
Click here for hazard details and duration
...
  •  
    Freeze Warning until April 21, 10:00am

    NOW until 10:00am Tue

    Freeze Warning

  • Today

    High: 61 °F

    Frost then
    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 48. South wind 6 to 8 mph.

    Low: 48 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Showers likely, mainly after 8am. Mostly cloudy, with a high near 71. Southwest wind 5 to 8 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 71 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 51. Light northwest wind.

    Low: 51 °F

    Decreasing
    Clouds

  • Thursday

    Thursday: Sunny, with a high near 77. Northwest wind 3 to 6 mph.

    High: 77 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 54.

    Low: 54 °F

    Partly Cloudy

  • Friday

    Friday: A chance of showers after 2pm. Mostly sunny, with a high near 78. Chance of precipitation is 30%.

    High: 78 °F

    Mostly Sunny
    then Chance
    Showers

  • Friday Night

    Friday Night: A chance of showers. Mostly cloudy, with a low around 53. Chance of precipitation is 40%.

    Low: 53 °F

    Chance
    Showers

Detailed Forecast

Today
Widespread frost before 10am. Otherwise, sunny, with a high near 61. Calm wind becoming southwest around 6 mph in the afternoon.
Tonight
Increasing clouds, with a low around 48. South wind 6 to 8 mph.
Wednesday
Showers likely, mainly after 8am. Mostly cloudy, with a high near 71. Southwest wind 5 to 8 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Wednesday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 51. Light northwest wind.
Thursday
Sunny, with a high near 77. Northwest wind 3 to 6 mph.
Thursday Night
Partly cloudy, with a low around 54.
Friday
A chance of showers after 2pm. Mostly sunny, with a high near 78. Chance of precipitation is 30%.
Friday Night
A chance of showers. Mostly cloudy, with a low around 53. Chance of precipitation is 40%.
Saturday
Showers likely, mainly after 2pm. Mostly cloudy, with a high near 64. Chance of precipitation is 70%.
Saturday Night
Showers. Low around 49. Chance of precipitation is 80%.
Sunday
Showers likely. Mostly cloudy, with a high near 61. Chance of precipitation is 60%.
Sunday Night
Partly cloudy, with a low around 45.
Monday
Mostly sunny, with a high near 67.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Derwood MD
 39.12°N 77.13°W (Elev. 348 ft)
Last Update:
4:53 am EDT Apr 21, 2026
Forecast Valid:
6am EDT Apr 21, 2026-6pm EDT Apr 27, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation