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.

A Few Clouds

66°F

19°C

Humidity 73%
Wind Speed Vrbl 5 mph
Barometer 30.09 in (1018.9 mb)
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 31 Aug 8:56 pm EDT
Extended Forecast for

South Yarmouth MA

  • Tonight

    Tonight: Mostly cloudy, with a low around 63. South wind 3 to 5 mph.

    Low: 63 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Showers likely, mainly after 10am. Patchy fog between 10am and 11am. Otherwise, mostly cloudy, with a high near 71. Southeast wind 6 to 11 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 71 °F

    Showers
    Likely and
    Patchy Fog

  • Tuesday Night

    Tuesday Night: A chance of showers, mainly before 11pm. Mostly cloudy, with a low around 62. East wind around 8 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 62 °F

    Chance
    Showers

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 73. East wind around 10 mph.

    High: 73 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: A chance of showers after 2am. Mostly cloudy, with a low around 64. Southeast wind around 7 mph. Chance of precipitation is 30%.

    Low: 64 °F

    Mostly Cloudy
    then Chance
    Showers

  • Thursday

    Thursday: Showers likely before 11am, then showers likely and possibly a thunderstorm between 11am and 2pm, then a chance of showers and thunderstorms after 2pm. Mostly cloudy, with a high near 79. South wind 10 to 13 mph. Chance of precipitation is 70%.

    High: 79 °F

    Showers
    Likely

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms before 8pm, then a chance of showers between 8pm and 3am. Mostly cloudy, with a low around 66. Southwest wind around 6 mph. Chance of precipitation is 40%.

    Low: 66 °F

    Chance
    T-storms then
    Chance
    Showers

  • Friday

    Friday: Mostly sunny, with a high near 76. Northwest wind 6 to 8 mph.

    High: 76 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 62. North wind 3 to 7 mph.

    Low: 62 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 63. South wind 3 to 5 mph.
Tuesday
Showers likely, mainly after 10am. Patchy fog between 10am and 11am. Otherwise, mostly cloudy, with a high near 71. Southeast wind 6 to 11 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Tuesday Night
A chance of showers, mainly before 11pm. Mostly cloudy, with a low around 62. East wind around 8 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Wednesday
Mostly cloudy, with a high near 73. East wind around 10 mph.
Wednesday Night
A chance of showers after 2am. Mostly cloudy, with a low around 64. Southeast wind around 7 mph. Chance of precipitation is 30%.
Thursday
Showers likely before 11am, then showers likely and possibly a thunderstorm between 11am and 2pm, then a chance of showers and thunderstorms after 2pm. Mostly cloudy, with a high near 79. South wind 10 to 13 mph. Chance of precipitation is 70%.
Thursday Night
A chance of showers and thunderstorms before 8pm, then a chance of showers between 8pm and 3am. Mostly cloudy, with a low around 66. Southwest wind around 6 mph. Chance of precipitation is 40%.
Friday
Mostly sunny, with a high near 76. Northwest wind 6 to 8 mph.
Friday Night
Partly cloudy, with a low around 62. North wind 3 to 7 mph.
Saturday
Mostly sunny, with a high near 71. North wind 11 to 15 mph.
Saturday Night
Partly cloudy, with a low around 61. North wind 8 to 10 mph.
Sunday
Mostly sunny, with a high near 70. North wind around 15 mph, with gusts as high as 26 mph.
Sunday Night
Partly cloudy, with a low around 61. North wind 5 to 7 mph.
Labor Day
Sunny, with a high near 72. North wind around 10 mph.
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ABOUT THIS FORECAST

 
Point Forecast:
South Yarmouth MA
 41.67°N 70.2°W (Elev. 10 ft)
Last Update:
2:21 pm EDT Aug 31, 2026
Forecast Valid:
9pm EDT Aug 31, 2026-6pm EDT Sep 7, 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