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

Flooding Risks from Tropical Moisture Across the Southeast and Southwest

Tropical moisture from Isaias and Rachel will impact portions of the Southeast and Southwest this weekend. Flash flooding, strong winds and even a threat for severe thunderstorms and tornadoes are possible. Meanwhile, strong winds and dry fuels are raising fire weather concerns across the central Great Basin and western High Plains. Across the northern Rockies, first winter storm of the season. Read More >

Current conditions at

Hyannis, Barnstable Municipal-Boardman Airport (KHYA)

Lat: 41.67°NLon: 70.27°WElev: 49ft.

Fair

42°F

6°C

Humidity 92%
Wind Speed Calm
Barometer 30.50 in (1032.8 mb)
Dewpoint 40°F (4°C)
Visibility 10.00 mi
Last update 10 Oct 9:56 pm EDT
Extended Forecast for

South Yarmouth MA

  • Tonight

    Tonight: Partly cloudy, with a low around 45. Calm wind.

    Low: 45 °F

    Partly Cloudy

  • Sunday

    Sunday: Increasing clouds, with a high near 63. South wind 6 to 9 mph.

    High: 63 °F

    Increasing
    Clouds

  • Sunday Night

    Sunday Night: Showers before 2am, then showers and possibly a thunderstorm between 2am and 5am, then a chance of showers and thunderstorms after 5am. Some of the storms could produce heavy rainfall. Patchy fog. Low around 56. East wind 6 to 10 mph, with gusts as high as 21 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.

    Low: 56 °F

    Heavy Rain
    and Patchy
    Fog

  • Columbus Day

    Columbus Day: A chance of showers before 7am. Patchy fog before 9am. Otherwise, mostly cloudy, with a high near 64. North wind around 11 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

    High: 64 °F

    Chance
    Showers and
    Patchy Fog
    then Mostly
    Cloudy

  • Monday Night

    Monday Night: Partly cloudy, with a low around 53. Calm wind becoming northeast around 6 mph after midnight.

    Low: 53 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 63. East wind around 9 mph becoming southeast in the afternoon.

    High: 63 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Showers likely, mainly after 5am. Mostly cloudy, with a low around 56. South wind around 9 mph, with gusts as high as 22 mph. Chance of precipitation is 60%.

    Low: 56 °F

    Showers
    Likely

  • Wednesday

    Wednesday: A chance of showers before 5pm. Partly sunny, with a high near 68. Southwest wind 11 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 50%.

    High: 68 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 51. Northwest wind 8 to 10 mph, with gusts as high as 20 mph.

    Low: 51 °F

    Partly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 45. Calm wind.
Sunday
Increasing clouds, with a high near 63. South wind 6 to 9 mph.
Sunday Night
Showers before 2am, then showers and possibly a thunderstorm between 2am and 5am, then a chance of showers and thunderstorms after 5am. Some of the storms could produce heavy rainfall. Patchy fog. Low around 56. East wind 6 to 10 mph, with gusts as high as 21 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.
Columbus Day
A chance of showers before 7am. Patchy fog before 9am. Otherwise, mostly cloudy, with a high near 64. North wind around 11 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Monday Night
Partly cloudy, with a low around 53. Calm wind becoming northeast around 6 mph after midnight.
Tuesday
Mostly cloudy, with a high near 63. East wind around 9 mph becoming southeast in the afternoon.
Tuesday Night
Showers likely, mainly after 5am. Mostly cloudy, with a low around 56. South wind around 9 mph, with gusts as high as 22 mph. Chance of precipitation is 60%.
Wednesday
A chance of showers before 5pm. Partly sunny, with a high near 68. Southwest wind 11 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 50%.
Wednesday Night
Partly cloudy, with a low around 51. Northwest wind 8 to 10 mph, with gusts as high as 20 mph.
Thursday
Mostly sunny, with a high near 61. North wind 11 to 14 mph.
Thursday Night
Partly cloudy, with a low around 49. North wind around 7 mph.
Friday
A chance of showers. Partly sunny, with a high near 63. East wind 8 to 11 mph becoming south in the afternoon. Chance of precipitation is 30%.
Friday Night
A chance of showers. Mostly cloudy, with a low around 51. South wind 11 to 13 mph, with gusts as high as 26 mph. Chance of precipitation is 50%.
Saturday
A chance of showers. Partly sunny, with a high near 61. West wind around 16 mph, with gusts as high as 29 mph. Chance of precipitation is 40%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
South Yarmouth MA
 41.67°N 70.2°W (Elev. 10 ft)
Last Update:
6:40 pm EDT Oct 10, 2026
Forecast Valid:
10pm EDT Oct 10, 2026-6pm EDT Oct 17, 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