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

Dangerous Heat and Heavy Rainfall into the Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend. Heat Advisories remain in effect. Heavy to excessive rainfall occurring at times through the weekend could bring areas of flooding to parts of the northern Rockies, upper Midwest, central Great Lakes, and southern New England. Read More >

Current conditions at

Annapolis, United States Naval Academy (KNAK)

Lat: 38.99°NLon: 76.49°WElev: 3ft.

Overcast

73°F

23°C

Humidity 79%
Wind Speed S 6 mph
Barometer 30.01 in (1016.2 mb)
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Last update 20 Sep 7:54 am EDT
Extended Forecast for

Arnold MD

  • Today

    Today: Scattered showers before 2pm, then scattered showers and thunderstorms between 2pm and 5pm, then showers likely and possibly a thunderstorm after 5pm. Mostly cloudy, with a high near 83. Southwest wind around 11 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 83 °F

    Showers
    Likely

  • Tonight

    Tonight: Showers and thunderstorms likely, mainly before 11pm. Mostly cloudy, with a low around 64. Calm wind becoming north around 6 mph after midnight. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 64 °F

    Showers
    Likely then
    Chance
    Showers

  • Monday

    Monday: A slight chance of showers between 2pm and 3pm. Mostly cloudy, with a high near 75. Northeast wind around 11 mph. Chance of precipitation is 20%.

    High: 75 °F

    Partly Sunny
    then Slight
    Chance
    Showers

  • Monday Night

    Monday Night: Showers likely, mainly after 2am. Cloudy, with a low around 59. East wind around 10 mph, with gusts as high as 21 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 59 °F

    Showers
    Likely

  • Tuesday

    Tuesday: Showers likely, with thunderstorms also possible after 2pm. Cloudy, with a high near 70. Northeast wind around 16 mph, with gusts as high as 26 mph. Chance of precipitation is 70%.

    High: 70 °F

    Showers
    Likely

  • Tuesday Night

    Tuesday Night: Showers likely and possibly a thunderstorm. Cloudy, with a low around 57. Chance of precipitation is 60%.

    Low: 57 °F

    Showers
    Likely

  • Wednesday

    Wednesday: A chance of showers. Mostly cloudy, with a high near 69. Chance of precipitation is 50%.

    High: 69 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers. Mostly cloudy, with a low around 56. Chance of precipitation is 40%.

    Low: 56 °F

    Chance
    Showers

  • Thursday

    Thursday: A chance of showers. Mostly cloudy, with a high near 69. Chance of precipitation is 30%.

    High: 69 °F

    Chance
    Showers

Detailed Forecast

Today
Scattered showers before 2pm, then scattered showers and thunderstorms between 2pm and 5pm, then showers likely and possibly a thunderstorm after 5pm. Mostly cloudy, with a high near 83. Southwest wind around 11 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tonight
Showers and thunderstorms likely, mainly before 11pm. Mostly cloudy, with a low around 64. Calm wind becoming north around 6 mph after midnight. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Monday
A slight chance of showers between 2pm and 3pm. Mostly cloudy, with a high near 75. Northeast wind around 11 mph. Chance of precipitation is 20%.
Monday Night
Showers likely, mainly after 2am. Cloudy, with a low around 59. East wind around 10 mph, with gusts as high as 21 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Tuesday
Showers likely, with thunderstorms also possible after 2pm. Cloudy, with a high near 70. Northeast wind around 16 mph, with gusts as high as 26 mph. Chance of precipitation is 70%.
Tuesday Night
Showers likely and possibly a thunderstorm. Cloudy, with a low around 57. Chance of precipitation is 60%.
Wednesday
A chance of showers. Mostly cloudy, with a high near 69. Chance of precipitation is 50%.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 56. Chance of precipitation is 40%.
Thursday
A chance of showers. Mostly cloudy, with a high near 69. Chance of precipitation is 30%.
Thursday Night
A slight chance of showers. Mostly cloudy, with a low around 54. Chance of precipitation is 20%.
Friday
A slight chance of showers. Partly sunny, with a high near 70. Chance of precipitation is 20%.
Friday Night
Mostly cloudy, with a low around 55.
Saturday
Mostly sunny, with a high near 71.
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ABOUT THIS FORECAST

 
Point Forecast:
Arnold MD
 39.06°N 76.51°W (Elev. 56 ft)
Last Update:
7:53 am EDT Sep 20, 2026
Forecast Valid:
8am EDT Sep 20, 2026-6pm EDT Sep 26, 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