- 01 10.0 Outer Banks, NCA perfect beach day 84° air 74° water 1.6 ft surf 10 mph 1% rain nothing against it
- 02 9.5 Hilton Head Island, SCA perfect beach day 83° air 81° water 0.9 ft surf 8 mph 16% rain nothing against it
- 03 9.5 Myrtle Beach, SCA perfect beach day 83° air 79° water 1.1 ft surf 12 mph 5% rain breezy (12 mph)
- 04 8.5 Rehoboth & Bethany, DEA perfect beach day 83° air 68° water 1.4 ft surf 12 mph 8% rain brisk water (68F), breezy (12 mph)
- 05 7.8 Ocean City, MDA good beach day 82° air 68° water 2.2 ft surf 12 mph 9% rain brisk water (68F), breezy (12 mph), some surf (2.2 ft)
- 06 7.3 30A, FLA good beach day 82° air 85° water 3.1 ft surf 14 mph 48% rain breezy (14 mph), 48% chance of rain, some surf (3.1 ft)
- 07 7.2 Destin, FLA good beach day 81° air 85° water 3.1 ft surf 16 mph 39% rain breezy (16 mph), some surf (3.1 ft)
- 08 5.7 Gulf Shores & Orange Beach, ALFair: pick your hours 81° air 85° water 3.1 ft surf 22 mph 43% rain windy (22 mph gusts), 43% chance of rain, some surf (3.1 ft)
- 09 4.8 Martha's Vineyard, MANot much of a beach day 74° air 64° water 3.1 ft surf 13 mph 54% rain cool air (74F high), cold water (64F), breezy (13 mph), 54% chance of rain, some surf (3.1 ft)
- 10 4.0 Nantucket, MANot much of a beach day 71° air 64° water 4.3 ft surf 16 mph 21% rain cool air (71F high), cold water (64F), breezy (16 mph), rough surf (4.3 ft)
Ten points, and the day loses them honestly.
Every shore starts at 10. Cool air below 78°F costs half a point per four degrees (up to three); above 92°F the same rule applies in the other direction (up to two). Water under 72°F costs a point, under 65°F two. Wind over 10 mph costs up to a point and a half, over 18 mph two and a half. The chance of rain costs up to three points in proportion. Surf over two feet costs half a point, over four feet a point and a half. The result is rounded to a tenth and capped between 0 and 10.
Forecast, UV, sunrise and sunset come from Open-Meteo's daily model for a point on the beach itself; wave height and sea-surface temperature from Open-Meteo's marine model for the same point; tide times and heights from the nearest open-coast NOAA CO-OPS prediction station. Everything refreshes with the morning rebuild. It is a guide to the day, not a promise, and it says nothing about crowds, jellyfish, or the line at the coffee place.