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

Chatham, Chatham Municipal Airport (KCQX)

Lat: 41.69°NLon: 69.99°WElev: 66ft.

Mostly Cloudy

70°F

21°C

Humidity 97%
Wind Speed SW 5 mph
Barometer 30.03 in (1017.1 mb)
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Last update 2 Aug 5:52 am EDT
Extended Forecast for

South Harwich MA

  • Today

    Today: Patchy fog before 8am. Otherwise, mostly cloudy, with a high near 76. South wind 7 to 10 mph.

    High: 76 °F

    Patchy Fog
    then Mostly
    Cloudy

  • Tonight

    Tonight: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 3am. Patchy fog after midnight. Low around 71. South wind 8 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 71 °F

    Chance
    Showers then
    Showers and
    Patchy Fog

  • Monday

    Monday: Showers and possibly a thunderstorm before 1pm, then showers likely. Patchy fog before 9am. High near 77. Southwest wind 14 to 17 mph, with gusts as high as 31 mph. Chance of precipitation is 80%. New precipitation amounts between a half and three quarters of an inch possible.

    High: 77 °F

    Showers and
    Patchy Fog

  • Monday Night

    Monday Night: A chance of showers and thunderstorms before 8pm, then showers likely and possibly a thunderstorm between 8pm and 2am, then a chance of showers after 2am. Mostly cloudy, with a low around 69. Southwest wind 8 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 69 °F

    Showers
    Likely

  • Tuesday

    Tuesday: A chance of showers, mainly before 8am. Partly sunny, with a high near 77. West wind 6 to 8 mph. Chance of precipitation is 30%.

    High: 77 °F

    Chance
    Showers then
    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 69. Southwest wind 5 to 7 mph.

    Low: 69 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 78. Southwest wind 5 to 10 mph.

    High: 78 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 71. Southwest wind around 8 mph.

    Low: 71 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 79. Southwest wind 9 to 14 mph.

    High: 79 °F

    Mostly Sunny

Detailed Forecast

Today
Patchy fog before 8am. Otherwise, mostly cloudy, with a high near 76. South wind 7 to 10 mph.
Tonight
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 3am. Patchy fog after midnight. Low around 71. South wind 8 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Monday
Showers and possibly a thunderstorm before 1pm, then showers likely. Patchy fog before 9am. High near 77. Southwest wind 14 to 17 mph, with gusts as high as 31 mph. Chance of precipitation is 80%. New precipitation amounts between a half and three quarters of an inch possible.
Monday Night
A chance of showers and thunderstorms before 8pm, then showers likely and possibly a thunderstorm between 8pm and 2am, then a chance of showers after 2am. Mostly cloudy, with a low around 69. Southwest wind 8 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tuesday
A chance of showers, mainly before 8am. Partly sunny, with a high near 77. West wind 6 to 8 mph. Chance of precipitation is 30%.
Tuesday Night
Mostly cloudy, with a low around 69. Southwest wind 5 to 7 mph.
Wednesday
Partly sunny, with a high near 78. Southwest wind 5 to 10 mph.
Wednesday Night
Mostly cloudy, with a low around 71. Southwest wind around 8 mph.
Thursday
Mostly sunny, with a high near 79. Southwest wind 9 to 14 mph.
Thursday Night
Partly cloudy, with a low around 72. Southwest wind 10 to 13 mph.
Friday
Mostly sunny, with a high near 79. Southwest wind 8 to 13 mph.
Friday Night
Partly cloudy, with a low around 71. Southwest wind 9 to 11 mph.
Saturday
Mostly sunny, with a high near 79. Southwest wind 7 to 13 mph.
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ABOUT THIS FORECAST

 
Point Forecast:
South Harwich MA
 41.67°N 70.05°W (Elev. 10 ft)
Last Update:
1:20 am EDT Aug 2, 2026
Forecast Valid:
6am EDT Aug 2, 2026-6pm EDT Aug 8, 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