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

Hyannis, Barnstable Municipal-Boardman Airport (KHYA)

Lat: 41.67°NLon: 70.27°WElev: 49ft.

Mostly Cloudy

73°F

23°C

Humidity 96%
Wind Speed SW 9 mph
Barometer 30.04 in (1017.4 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Last update 15 Jul 3:56 am EDT
Extended Forecast for

South Dennis MA

  • Overnight

    Overnight: A slight chance of showers, then a chance of showers and thunderstorms after 5am. Patchy fog. Otherwise, mostly cloudy, with a low around 69. Southwest wind around 6 mph. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 69 °F

    Chance
    Showers and
    Patchy Fog

  • Tuesday

    Tuesday: A chance of showers and thunderstorms, mainly before 8am. Patchy fog before 8am. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 83. Southwest wind 6 to 9 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 83 °F

    Chance
    Showers and
    Patchy Fog
    then Partly
    Sunny

  • Tuesday Night

    Tuesday Night: Patchy fog after 2am. Otherwise, increasing clouds, with a low around 70. Southwest wind around 6 mph.

    Low: 70 °F

    Mostly Cloudy
    then Patchy
    Fog

  • Wednesday

    Wednesday: Patchy fog before 7am. Otherwise, mostly sunny, with a high near 85. South wind 5 to 10 mph.

    High: 85 °F

    Patchy Fog
    then Mostly
    Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 71. Southwest wind around 7 mph.

    Low: 71 °F

    Mostly Cloudy

  • Thursday

    Thursday: A slight chance of showers and thunderstorms before 11am, then a slight chance of showers between 11am and 2pm, then a slight chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 85. Southwest wind 8 to 11 mph, with gusts as high as 21 mph. Chance of precipitation is 20%.

    High: 85 °F

    Slight Chance
    T-storms

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 72. Southwest wind 8 to 10 mph.

    Low: 72 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 87. West wind 7 to 9 mph.

    High: 87 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 68. North wind 3 to 5 mph.

    Low: 68 °F

    Mostly Cloudy

Detailed Forecast

Overnight
A slight chance of showers, then a chance of showers and thunderstorms after 5am. Patchy fog. Otherwise, mostly cloudy, with a low around 69. Southwest wind around 6 mph. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tuesday
A chance of showers and thunderstorms, mainly before 8am. Patchy fog before 8am. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 83. Southwest wind 6 to 9 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tuesday Night
Patchy fog after 2am. Otherwise, increasing clouds, with a low around 70. Southwest wind around 6 mph.
Wednesday
Patchy fog before 7am. Otherwise, mostly sunny, with a high near 85. South wind 5 to 10 mph.
Wednesday Night
Mostly cloudy, with a low around 71. Southwest wind around 7 mph.
Thursday
A slight chance of showers and thunderstorms before 11am, then a slight chance of showers between 11am and 2pm, then a slight chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 85. Southwest wind 8 to 11 mph, with gusts as high as 21 mph. Chance of precipitation is 20%.
Thursday Night
Partly cloudy, with a low around 72. Southwest wind 8 to 10 mph.
Friday
Mostly sunny, with a high near 87. West wind 7 to 9 mph.
Friday Night
Mostly cloudy, with a low around 68. North wind 3 to 5 mph.
Saturday
Sunny, with a high near 81. Northeast wind around 7 mph.
Saturday Night
Partly cloudy, with a low around 66. Light and variable wind.
Sunday
Partly sunny, with a high near 82. South wind 5 to 9 mph.
Sunday Night
A chance of showers. Mostly cloudy, with a low around 68. South wind around 7 mph. Chance of precipitation is 40%.
Monday
A chance of showers. Mostly sunny, with a high near 82. West wind 7 to 9 mph becoming south in the afternoon. Chance of precipitation is 30%.
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ABOUT THIS FORECAST

 
Point Forecast:
South Dennis MA
 41.71°N 70.16°W (Elev. 49 ft)
Last Update:
1:16 am EDT Jul 15, 2025
Forecast Valid:
4am EDT Jul 15, 2025-6pm EDT Jul 21, 2025
 
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