National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Tracking Atmospheric River for the West Coast; Space Weather Storming Continues

An atmospheric river will bring threats of gusty to high winds and heavy rainfall to California mainly Thursday into Saturday which may bring areas of flooding and wind damage. Heavy snow will be possible over the Sierra Nevada mountains Thursday into Friday associated with the atmospheric river. Minor to severe geomagnetic storming (space weather) is expected to continue into early Thursday. Read More >

Hazardous Weather Conditions

Current conditions at

Gaithersburg - Montgomery County Airport (KGAI)

Lat: 39.17°NLon: 77.17°WElev: 495ft.

Overcast

48°F

9°C

Humidity 50%
Wind Speed S 3 mph
Barometer 29.91 in (1014.5 mb)
Dewpoint 30°F (-1°C)
Visibility 10.00 mi
Last update 12 Nov 9:56 pm EST
Extended Forecast for

5 Miles ESE Unionville MD

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming mostly clear, with a low around 35. West wind around 8 mph.

    Low: 35 °F

    Decreasing
    Clouds

  • Thursday

    Thursday: Sunny, with a high near 52. Northwest wind 7 to 15 mph, with gusts as high as 24 mph.

    High: 52 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 31. Northwest wind 3 to 6 mph.

    Low: 31 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 52. West wind 5 to 9 mph.

    High: 52 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 32. Light north wind.

    Low: 32 °F

    Partly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 55.

    High: 55 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Rain likely, mainly after 1am. Mostly cloudy, with a low around 47. Chance of precipitation is 60%.

    Low: 47 °F

    Rain Likely

  • Sunday

    Sunday: A chance of rain before 1pm. Mostly sunny, with a high near 60. Chance of precipitation is 30%.

    High: 60 °F

    Chance Rain

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 36.

    Low: 36 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly cloudy, then gradually becoming mostly clear, with a low around 35. West wind around 8 mph.
Thursday
Sunny, with a high near 52. Northwest wind 7 to 15 mph, with gusts as high as 24 mph.
Thursday Night
Mostly clear, with a low around 31. Northwest wind 3 to 6 mph.
Friday
Mostly sunny, with a high near 52. West wind 5 to 9 mph.
Friday Night
Partly cloudy, with a low around 32. Light north wind.
Saturday
Partly sunny, with a high near 55.
Saturday Night
Rain likely, mainly after 1am. Mostly cloudy, with a low around 47. Chance of precipitation is 60%.
Sunday
A chance of rain before 1pm. Mostly sunny, with a high near 60. Chance of precipitation is 30%.
Sunday Night
Mostly clear, with a low around 36.
Monday
Sunny, with a high near 49.
Monday Night
Partly cloudy, with a low around 32.
Tuesday
A chance of rain. Partly sunny, with a high near 48. Chance of precipitation is 30%.
Tuesday Night
A chance of rain. Mostly cloudy, with a low around 37. Chance of precipitation is 30%.
Wednesday
Mostly sunny, with a high near 52.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
5 Miles ESE Unionville MD
 39.47°N 77.04°W (Elev. 801 ft)
Last Update:
9:29 pm EST Nov 12, 2025
Forecast Valid:
10pm EST Nov 12, 2025-6pm EST Nov 19, 2025
 
Forecast Discussion
 
Get as KML Get as XML

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