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 >

Hazardous Weather Conditions

Current conditions at

South Haven, South Haven Area Regional Airport (KLWA)

Lat: 42.35°NLon: 86.26°WElev: 666ft.

Mostly Cloudy

68°F

20°C

Humidity 73%
Wind Speed NE 5 mph
Barometer 30.17 in
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Last update 18 Sep 7:55 pm EDT
Extended Forecast for

South Haven MI

Flood Watch September 19, 02:00am until September 20, 08:00am
Click here for hazard details and duration
Flood Watch

  • Tonight

    Tonight: A chance of showers, then showers likely and possibly a thunderstorm after 5am. Mostly cloudy, with a low around 54. East wind 7 to 11 mph, with gusts as high as 22 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 54 °F

    Chance
    Showers then
    Showers
    Likely

  • Saturday

    Saturday: Showers and possibly a thunderstorm. High near 71. Southeast wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.

    High: 71 °F

    Showers

  • Saturday Night

    Saturday Night: Showers and possibly a thunderstorm before 2am, then showers likely. Some of the storms could produce heavy rainfall. Low around 57. East northeast wind around 7 mph. Chance of precipitation is 90%. New rainfall amounts between 1 and 2 inches possible.

    Low: 57 °F

    Heavy Rain

  • Sunday

    Sunday: Showers likely, mainly before 2pm. Mostly cloudy, with a high near 69. Northeast wind 10 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.

    High: 69 °F

    Showers
    Likely

  • Sunday Night

    Sunday Night: A chance of showers before 8pm, then a slight chance of showers after 2am. Mostly cloudy, with a low around 51. East northeast wind 11 to 13 mph, with gusts as high as 22 mph. Chance of precipitation is 30%.

    Low: 51 °F

    Chance
    Showers

  • Monday

    Monday: A 30 percent chance of showers after 2pm. Mostly cloudy, with a high near 66.

    High: 66 °F

    Mostly Cloudy
    then Chance
    Showers

  • Monday Night

    Monday Night: A 30 percent chance of showers before 8pm. Mostly cloudy, with a low around 49.

    Low: 49 °F

    Chance
    Showers then
    Mostly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 65.

    High: 65 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 50.

    Low: 50 °F

    Mostly Cloudy

Detailed Forecast

Tonight
A chance of showers, then showers likely and possibly a thunderstorm after 5am. Mostly cloudy, with a low around 54. East wind 7 to 11 mph, with gusts as high as 22 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday
Showers and possibly a thunderstorm. High near 71. Southeast wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.
Saturday Night
Showers and possibly a thunderstorm before 2am, then showers likely. Some of the storms could produce heavy rainfall. Low around 57. East northeast wind around 7 mph. Chance of precipitation is 90%. New rainfall amounts between 1 and 2 inches possible.
Sunday
Showers likely, mainly before 2pm. Mostly cloudy, with a high near 69. Northeast wind 10 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.
Sunday Night
A chance of showers before 8pm, then a slight chance of showers after 2am. Mostly cloudy, with a low around 51. East northeast wind 11 to 13 mph, with gusts as high as 22 mph. Chance of precipitation is 30%.
Monday
A 30 percent chance of showers after 2pm. Mostly cloudy, with a high near 66.
Monday Night
A 30 percent chance of showers before 8pm. Mostly cloudy, with a low around 49.
Tuesday
Partly sunny, with a high near 65.
Tuesday Night
Mostly cloudy, with a low around 50.
Wednesday
Partly sunny, with a high near 66.
Wednesday Night
Mostly cloudy, with a low around 51.
Thursday
Partly sunny, with a high near 68.
Thursday Night
Mostly cloudy, with a low around 52.
Friday
Mostly sunny, with a high near 70.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
South Haven MI
 42.41°N 86.28°W (Elev. 597 ft)
Last Update:
7:41 pm EDT Sep 18, 2026
Forecast Valid:
8pm EDT Sep 18, 2026-6pm EDT Sep 25, 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