The Perfect Beach Day Formula
| Factor | Ideal Range | Too Low | Too High |
|---|---|---|---|
| Air temp | 26-32°C | Below 24°C (chilly in swimwear) | Above 35°C (dangerous heat) |
| Water temp | 24-28°C | Below 20°C (bracing) | Above 30°C (not refreshing) |
| Wind | 5-15 km/h | Calm (no cooling breeze) | Above 25 km/h (sand blowing) |
| UV Index | 4-7 | Below 3 (weak sun) | Above 8 (burns fast) |
| Wave height | 0.3-1m | Flat (boring for swimmers) | Above 2m (dangerous) |
Water Temperature by Season
| Destination | Summer | Winter |
|---|---|---|
| Mediterranean | 24-28°C | 14-18°C |
| Caribbean | 27-30°C | 25-28°C |
| Hawaii | 25-27°C | 23-25°C |
| Thailand | 28-30°C | 27-29°C |
| Australia (east) | 22-26°C | 18-22°C |
Wind and Waves
- Onshore wind: Blows from sea to land. Creates chop and rough swimming conditions.
- Offshore wind: Blows from land to sea. Creates calm, glassy water. Best for beach lounging and swimming.
- Cross-shore wind: Can create lateral currents. Be cautious.
Sun Safety on the Beach
Sand reflects 15-25% of UV rays, effectively increasing your exposure. Apply SPF 30+ sunscreen, reapply after swimming, and seek shade during peak UV hours (10am-2pm). Wear a hat and quality sunglasses.
Red Flags
| Flag Colour | Meaning |
|---|---|
| Green | Calm conditions, safe to swim |
| Yellow | Moderate conditions, caution advised |
| Red | Dangerous — do not swim |
| Purple | Marine hazards (jellyfish, sharks) |
| No flags | Unmonitored — swim at your own risk |
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