The Wave Height Forecast service is provided by SurferToday.com and powered by NOAA.
Check the wave height surf report for the next seven days. Select your surf forecast region:

 

Hawaii

California

USA East Coast

USA West Coast

Gulf of Mexico

Caribbean Sea

Australia & Indonesia

Atlantic

Puerto Rico

UK & France

Brazil, Mexico & Southeast USA

Portugal & Spain

India & Africa

Alaska, Canada & Russia

 

The technical notice made by NOAA:

The significant wave height is a measure for the wave height, and closely corresponds to what a trained observer would consider to be the mean wave height. Note that the highest wave height of an individual wave will be significantly larger.

NOAA - National Oceanic and Atmospheric Administration