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20NM E Hyannis MA

[NOTICE]

High and low forecast temperature values represent air temperature.

Last Update: 2:28 am EDT Aug 18, 2026
Forecast Valid: 3am EDT Aug 18, 2026-6pm EDT Aug 24, 2026

Tuesday

N wind 11 to 13 kt. Patchy fog before noon. Seas around 2 ft.

Tuesday Night

Variable winds 5 kt or less. Patchy fog. Seas around 3 ft.

Wednesday

SSW wind 5 to 8 kt increasing to 8 to 11 kt in the afternoon. Mostly cloudy, then gradually becoming sunny. Seas around 2 ft.

Wednesday Night

WSW wind 8 to 10 kt. Partly cloudy. Seas around 2 ft.

Thursday

WSW wind 6 to 8 kt becoming SSW in the afternoon. Mostly sunny. Seas around 2 ft.

Thursday Night

SSW wind 5 to 7 kt becoming WSW after midnight. A chance of showers and thunderstorms. Seas around 2 ft.

Friday

ENE wind 6 to 8 kt. A chance of showers. Seas around 2 ft.

Friday Night

ENE wind around 6 kt becoming variable and less than 5 kt. Mostly cloudy. Seas around 2 ft.

Saturday

ENE wind 9 to 11 kt. A chance of showers. Seas around 2 ft.

*Notices:

This forecast is for a single location. For safety concerns, mariners should be aware of the weather over a larger area. Forecast information for a larger area can be found within the zone forecast and the NDFD graphics.
The forecast conditions at a particular point may not exceed the criteria of a Small Craft Advisory, Gale, Storm etc. These watches/warnings/advisories are issued for the entire zone in which the point resides and mariners should act accordingly.