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

Heavy Rainfall and Flooding in the Southwest and Along the East Coast

A multi-day heavy rainfall event is set to begin across New Mexico into west Texas Tuesday through Wednesday. Flash flooding and debris flows in the vicinity of burn scars will also be possible. A strong coastal low will develop offshore of the Mid-Atlantic coast midweek, bringing heavy rainfall, strong winds and coastal flooding to much of the East Coast through Friday. Read More >

Hazardous Weather Conditions

Current conditions at

Gaithersburg - Montgomery County Airport (KGAI)

Lat: 39.17°NLon: 77.17°WElev: 495ft.

Rain

59°F

15°C

Humidity NA
Wind Speed NE 3 mph
Barometer 30.16 in (1022.7 mb)
Dewpoint N/A
Visibility 8.00 mi
Last update 22 Sep 5:56 am EDT
Extended Forecast for

Olney MDSimilar City Names

  • Today

    Today: Showers. Patchy fog after 8am. High near 60. Northeast wind 11 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

    High: 60 °F

    Showers and
    Patchy Fog

  • Tonight

    Tonight: Showers. Patchy fog before 11pm. Low around 54. Northeast wind 11 to 13 mph, with gusts as high as 24 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 54 °F

    Showers and
    Patchy Fog

  • Wednesday

    Wednesday: A chance of showers, mainly before 1pm. Cloudy, with a high near 62. Northeast wind around 14 mph, with gusts as high as 24 mph. Chance of precipitation is 50%.

    High: 62 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 52. Northeast wind around 10 mph, with gusts as high as 22 mph.

    Low: 52 °F

    Mostly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 63. Northeast wind 10 to 13 mph, with gusts as high as 21 mph.

    High: 63 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 50.

    Low: 50 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 66.

    High: 66 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 52.

    Low: 52 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 67.

    High: 67 °F

    Mostly Sunny

Detailed Forecast

Today
Showers. Patchy fog after 8am. High near 60. Northeast wind 11 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Tonight
Showers. Patchy fog before 11pm. Low around 54. Northeast wind 11 to 13 mph, with gusts as high as 24 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Wednesday
A chance of showers, mainly before 1pm. Cloudy, with a high near 62. Northeast wind around 14 mph, with gusts as high as 24 mph. Chance of precipitation is 50%.
Wednesday Night
Mostly cloudy, with a low around 52. Northeast wind around 10 mph, with gusts as high as 22 mph.
Thursday
Partly sunny, with a high near 63. Northeast wind 10 to 13 mph, with gusts as high as 21 mph.
Thursday Night
Partly cloudy, with a low around 50.
Friday
Mostly sunny, with a high near 66.
Friday Night
Partly cloudy, with a low around 52.
Saturday
Mostly sunny, with a high near 67.
Saturday Night
Partly cloudy, with a low around 53.
Sunday
Mostly sunny, with a high near 69.
Sunday Night
Partly cloudy, with a low around 53.
Monday
Sunny, with a high near 71.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Olney MDSimilar City Names
 39.14°N 77.1°W (Elev. 449 ft)
Last Update:
4:53 am EDT Sep 22, 2026
Forecast Valid:
6am EDT Sep 22, 2026-6pm EDT Sep 28, 2026
 
Forecast Discussion
 
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Additional Resources

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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