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.

Fair

79°F

26°C

Humidity 79%
Wind Speed Vrbl 7 mph
Barometer 29.99 in (1015.7 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index82°F (28°C)
Last update 2 Aug 2:56 pm EDT
Extended Forecast for

South Yarmouth MA

  • Tonight

    Tonight: Showers likely and possibly a thunderstorm before 4am, then a chance of showers and thunderstorms between 4am and 5am, then showers and possibly a thunderstorm after 5am. Some of the storms could produce heavy rainfall. Patchy fog after midnight. Low around 71. South wind 6 to 10 mph, with gusts as high as 23 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 71 °F

    Chance
    Showers then
    Heavy Rain
    and Patchy
    Fog

  • Monday

    Monday: Showers and possibly a thunderstorm before noon, then a chance of showers between noon and 5pm, then showers likely and possibly a thunderstorm after 5pm. Some of the storms could produce heavy rainfall. Patchy fog between 11am and noon. High near 81. South wind 15 to 18 mph, with gusts as high as 38 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 81 °F

    Heavy Rain
    and Patchy
    Fog

  • Monday Night

    Monday Night: Showers likely and possibly a thunderstorm before 11pm, then a chance of showers. Some of the storms could produce heavy rainfall. Patchy fog before midnight. Otherwise, cloudy, then gradually becoming partly cloudy, with a low around 67. Southwest wind 6 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 67 °F

    Heavy Rain
    and Patchy
    Fog

  • Tuesday

    Tuesday: Mostly sunny, with a high near 81. West wind 6 to 8 mph becoming southwest in the afternoon.

    High: 81 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 67. Southwest wind 3 to 5 mph.

    Low: 67 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 81. Calm wind becoming south 5 to 8 mph in the morning.

    High: 81 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 70. Southwest wind around 6 mph.

    Low: 70 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 82. Southwest wind 6 to 11 mph.

    High: 82 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 72. Southwest wind 7 to 9 mph.

    Low: 72 °F

    Partly Cloudy

Detailed Forecast

Tonight
Showers likely and possibly a thunderstorm before 4am, then a chance of showers and thunderstorms between 4am and 5am, then showers and possibly a thunderstorm after 5am. Some of the storms could produce heavy rainfall. Patchy fog after midnight. Low around 71. South wind 6 to 10 mph, with gusts as high as 23 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Monday
Showers and possibly a thunderstorm before noon, then a chance of showers between noon and 5pm, then showers likely and possibly a thunderstorm after 5pm. Some of the storms could produce heavy rainfall. Patchy fog between 11am and noon. High near 81. South wind 15 to 18 mph, with gusts as high as 38 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Monday Night
Showers likely and possibly a thunderstorm before 11pm, then a chance of showers. Some of the storms could produce heavy rainfall. Patchy fog before midnight. Otherwise, cloudy, then gradually becoming partly cloudy, with a low around 67. Southwest wind 6 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tuesday
Mostly sunny, with a high near 81. West wind 6 to 8 mph becoming southwest in the afternoon.
Tuesday Night
Partly cloudy, with a low around 67. Southwest wind 3 to 5 mph.
Wednesday
Mostly sunny, with a high near 81. Calm wind becoming south 5 to 8 mph in the morning.
Wednesday Night
Mostly cloudy, with a low around 70. Southwest wind around 6 mph.
Thursday
Mostly sunny, with a high near 82. Southwest wind 6 to 11 mph.
Thursday Night
Partly cloudy, with a low around 72. Southwest wind 7 to 9 mph.
Friday
Mostly sunny, with a high near 83. Southwest wind 7 to 11 mph, with gusts as high as 21 mph.
Friday Night
Partly cloudy, with a low around 72. Southwest wind 6 to 9 mph.
Saturday
Mostly sunny, with a high near 82. Southwest wind 6 to 11 mph.
Saturday Night
Partly cloudy, with a low around 71. Southwest wind 6 to 8 mph.
Sunday
Mostly sunny, with a high near 82. Southwest wind 6 to 13 mph.
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ABOUT THIS FORECAST

 
Point Forecast:
South Yarmouth MA
 41.67°N 70.2°W (Elev. 10 ft)
Last Update:
3:23 pm EDT Aug 2, 2026
Forecast Valid:
3pm EDT Aug 2, 2026-6pm EDT Aug 9, 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