Sea View — Ha Long Bay

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

Ocean Viewing Index

Updated · Oct 23, 2026 22:33

Reference time: local noon · 11:35 (Asia/Ho_Chi_Minh)

Estimated
61
Fair

Fair conditions. Sea color may appear muted.

Sub-Index Breakdown

Six dimensions feed the overall Ocean Viewing Index.

  • Sea Color
    Clear blue-green · hue
    76.6
  • Clarity
    Very clear (below 1.5 NTU) · NTU
    90.4
  • Visibility
    Under 8 m · m
    0.4
  • Sea State
    Calm, glassy (0-1) · Beaufort
    100
  • Lighting
    Low / harsh light · lux
    43.1
  • Water Quality
    index
    —

Sea Color

Observed Oct 23, 2026

Climatology
Blue — Clear
#2563eb
Turbidity
9.20 NTU
Chlorophyll
0.87 mg/m³

FU=5, hue=182.1°, Kd490=0.184

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

Noon11:35
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 · 11:35 (Asia/Ho_Chi_Minh)

7-Day OVI Trend

Forecast ocean viewing conditions for the coming week.

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