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Severe Thunderstorm and Excessive Rainfall Potential for the Central U.S. Today

Severe thunderstorms with a threat for large hail, isolated damaging winds and possibly a tornado are expected in parts of eastern Colorado today from mid afternoon to early evening. Several days of heavy rainfall will begin today over the western Gulf Coast where Flood Watches and excessive rainfall outlooks have been issued for today, Saturday, and Sunday. Read More >

Current conditions at

Gaithersburg - Montgomery County Airport (KGAI)

Lat: 39.17°NLon: 77.17°WElev: 495ft.

Light Rain

55°F

13°C

Humidity NA
Wind Speed Calm
Barometer 30.22 in (1024.5 mb)
Dewpoint N/A
Visibility 10.00 mi
Last update 21 May 4:56 pm EDT
Extended Forecast for

Rockville MD

  • This Afternoon

    This Afternoon: Scattered showers. Cloudy, with a high near 62. Northeast wind around 5 mph. Chance of precipitation is 40%.

    High: 62 °F

    Scattered
    Showers

  • Tonight

    Tonight: Showers, mainly before 4am. Low around 54. Northeast wind 6 to 8 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 54 °F

    Showers

  • Friday

    Friday: Showers, mainly after 11am. High near 59. East wind 8 to 10 mph, with gusts as high as 18 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 59 °F

    Showers
    Likely then
    Showers

  • Friday Night

    Friday Night: Showers. Low around 50. East wind 8 to 10 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 50 °F

    Showers

  • Saturday

    Saturday: Showers, with thunderstorms also possible after 5pm. High near 59. East wind around 11 mph, with gusts as high as 20 mph. Chance of precipitation is 100%.

    High: 59 °F

    Showers

  • Saturday Night

    Saturday Night: Showers and possibly a thunderstorm. Low around 54. Chance of precipitation is 90%.

    Low: 54 °F

    Showers

  • Sunday

    Sunday: A chance of showers before 2pm. Mostly cloudy, with a high near 72. Chance of precipitation is 30%.

    High: 72 °F

    Chance
    Showers

  • Sunday Night

    Sunday Night: A chance of showers after 8pm. Mostly cloudy, with a low around 59. Chance of precipitation is 50%.

    Low: 59 °F

    Chance
    Showers

  • Memorial Day

    Memorial Day: Showers likely, mainly after 2pm. Mostly cloudy, with a high near 71. Chance of precipitation is 60%.

    High: 71 °F

    Showers
    Likely

Detailed Forecast

This Afternoon
Scattered showers. Cloudy, with a high near 62. Northeast wind around 5 mph. Chance of precipitation is 40%.
Tonight
Showers, mainly before 4am. Low around 54. Northeast wind 6 to 8 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday
Showers, mainly after 11am. High near 59. East wind 8 to 10 mph, with gusts as high as 18 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday Night
Showers. Low around 50. East wind 8 to 10 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Saturday
Showers, with thunderstorms also possible after 5pm. High near 59. East wind around 11 mph, with gusts as high as 20 mph. Chance of precipitation is 100%.
Saturday Night
Showers and possibly a thunderstorm. Low around 54. Chance of precipitation is 90%.
Sunday
A chance of showers before 2pm. Mostly cloudy, with a high near 72. Chance of precipitation is 30%.
Sunday Night
A chance of showers after 8pm. Mostly cloudy, with a low around 59. Chance of precipitation is 50%.
Memorial Day
Showers likely, mainly after 2pm. Mostly cloudy, with a high near 71. Chance of precipitation is 60%.
Monday Night
Showers likely, mainly before 2am. Mostly cloudy, with a low around 62. Chance of precipitation is 60%.
Tuesday
A chance of showers. Mostly cloudy, with a high near 74. Chance of precipitation is 50%.
Tuesday Night
Mostly cloudy, with a low around 62.
Wednesday
A chance of showers. Mostly cloudy, with a high near 80. Chance of precipitation is 30%.
Wednesday Night
Mostly cloudy, with a low around 62.
Thursday
Mostly sunny, with a high near 79.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Rockville MD
 39.1°N 77.16°W (Elev. 446 ft)
Last Update:
5:10 pm EDT May 21, 2026
Forecast Valid:
5pm EDT May 21, 2026-6pm EDT May 28, 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