- 01 9.3 Myrtle Beach, SCA perfect beach day 85° air 83° water 2.9 ft surf 11 mph 1% rain breezy (11 mph), some surf (2.9 ft)
- 02 9.3 Outer Banks, NCA perfect beach day 84° air 82° water 1.8 ft surf 14 mph 0% rain breezy (14 mph)
- 03 8.9 30A, FLA perfect beach day 91° air 87° water 1.7 ft surf 14 mph 13% rain breezy (14 mph)
- 04 8.5 Ocean City, MDA perfect beach day 83° air 78° water 2.7 ft surf 15 mph 0% rain breezy (15 mph), some surf (2.7 ft)
- 05 8.5 Rehoboth & Bethany, DEA perfect beach day 84° air 77° water 1.9 ft surf 18 mph 1% rain breezy (18 mph)
- 06 8.2 Destin, FLA good beach day 88° air 87° water 2.0 ft surf 14 mph 18% rain breezy (14 mph), some surf (2.0 ft)
- 07 8.2 Gulf Shores & Orange Beach, ALA good beach day 88° air 87° water 2.4 ft surf 15 mph 9% rain breezy (15 mph), some surf (2.4 ft)
- 08 7.5 Martha's Vineyard, MAA good beach day 77° air 70° water 2.9 ft surf 13 mph 7% rain cool air (77F high), brisk water (70F), breezy (13 mph), some surf (2.9 ft)
- 09 7.2 Nantucket, MAA good beach day 75° air 71° water 3.1 ft surf 14 mph 7% rain cool air (75F high), brisk water (71F), breezy (14 mph), some surf (3.1 ft)
- 10 7.1 Hilton Head Island, SCA good beach day 83° air 85° water 3.1 ft surf 16 mph 39% rain breezy (16 mph), some surf (3.1 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.