- 01 9.6 30A, FLA perfect beach day 94° air 87° water 1.2 ft surf 9 mph 6% rain hot (94F high)
- 02 9.6 Destin, FLA perfect beach day 89° air 87° water 1.1 ft surf 10 mph 12% rain nothing against it
- 03 9.4 Gulf Shores & Orange Beach, ALA perfect beach day 95° air 89° water 1.1 ft surf 10 mph 7% rain hot (95F high)
- 04 9.0 Martha's Vineyard, MAA perfect beach day 77° air 74° water 1.6 ft surf 9 mph 30% rain cool air (77F high)
- 05 9.0 Outer Banks, NCA perfect beach day 86° air 84° water 1.6 ft surf 14 mph 7% rain breezy (14 mph)
- 06 8.8 Myrtle Beach, SCA perfect beach day 85° air 87° water 1.9 ft surf 12 mph 25% rain breezy (12 mph)
- 07 8.5 Hilton Head Island, SCA perfect beach day 86° air 88° water 1.6 ft surf 12 mph 38% rain breezy (12 mph)
- 08 8.3 Rehoboth & Bethany, DEA good beach day 82° air 74° water 1.6 ft surf 12 mph 45% rain breezy (12 mph), 45% chance of rain
- 09 7.9 Ocean City, MDA good beach day 84° air 76° water 2.1 ft surf 10 mph 52% rain 52% chance of rain, some surf (2.1 ft)
- 10 7.8 Nantucket, MAA good beach day 76° air 72° water 3.1 ft surf 12 mph 33% rain cool air (76F high), breezy (12 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.