Sea View — Hac Sa Beach

Today's Ocean Viewing Index and the six sub-indices behind it.

Ocean Viewing Index

Updated · Oct 25, 2026 01:04

Reference time: local noon · 12:09 (Asia/Macau)

Estimated
81
Excellent

Excellent viewing conditions. Highly recommended!

Sub-Index Breakdown

Six dimensions feed the overall Ocean Viewing Index.

  • Sea Color
    Clear blue-green · hue
    75.3
  • Clarity
    Turbid · NTU
    49.3
  • Visibility
    15+ m horizontal · m
    98.7
  • Sea State
    Calm, glassy (0-1) · Beaufort
    100
  • Lighting
    Golden hour, optimal · lux
    98.3
  • Water Quality
    index
    —

Sea Color

Observed Oct 25, 2026

Climatology
Blue — Clear
#2563eb
Turbidity
5.90 NTU
Chlorophyll
1.35 mg/m³

FU=5, hue=162.4°, Kd490=0.286

Sea color through the day

The FU index represents the inherent color around local noon (closest to the true sea color); perceived color varies slightly by time of day with light and weather.

Morning08:00
Soft green-blue
#0891b2

Cloudy/hazy conditions darken the apparent color

Noon12:09
Natural sea color
#2563eb

Cloudy/hazy conditions darken the apparent color

Afternoon15:00
Deep blue
#1e4d8c

Cloudy/hazy conditions darken the apparent color

Dusk18:00
Deep indigo (low light)
#1e4d8c

Cloudy/hazy conditions darken the apparent color

Local noon · 12:09 (Asia/Macau)

7-Day OVI Trend

Forecast ocean viewing conditions for the coming week.

Best today: Viewing conditions are Excellent; aim for the golden hour just after sunrise or before sunset. Great for snorkeling and photography.

7-Day Sub-Index Forecast

Six dimensions of ocean viewing quality over the coming week.

Sea Color
Sun
Mon
Tue
Wed
Thu
Fri
Sat
Sea color (Forel-Ule scale) — empty block means no verified data.