Koh Tao Weekly Dive Report 9.03 – 15.03
March 9 – March 15
From the team at Master Divers
Location: Koh Tao, Gulf of Thailand
The second week of March continues the gradual shift toward calmer conditions in the Gulf of Thailand. Forecast models suggest relatively stable weather with moderate sunshine, light winds and manageable sea state throughout most of the week.
At Master Divers we monitor forecasts daily using data from Windy, Windguru and the Thai Meteorological Department (TMD). These tools help us plan dive schedules and select the best dive sites depending on real-time conditions.
Whether you’re exploring Koh Tao’s reefs for fun dives or completing a course through PADI, the coming week should offer generally comfortable diving conditions.
Weather Overview
Forecasts indicate mostly dry conditions with a mix of sunshine and light cloud cover across the week. Short tropical showers remain possible, particularly later in the day or overnight, but extended rainfall is unlikely.
This pattern is typical for early March as the northeast monsoon influence gradually weakens.
Wind Conditions
Wind patterns remain largely northeasterly but lighter than earlier in the season. Speeds are expected to range between 5–12 knots, occasionally increasing slightly during the afternoon.
These lighter winds should make for smoother boat rides and allow access to a wider range of dive sites around Koh Tao.
Swell & Sea State
Sea conditions remain relatively calm for the time of year. Forecast swell is expected to stay around 0.4–0.9 metres, mainly coming from the NE to E direction.
Some minor surface movement may still be present at more exposed eastern dive sites, while the western and southern bays typically provide calmer water.
Overall, these conditions are favourable for both recreational diving and training dives.
Underwater Visibility
Visibility around Koh Tao is expected to remain stable to improving, particularly on days with lighter winds and minimal rainfall.
Protected dive sites often offer clearer conditions, while plankton activity may slightly reduce visibility at times. This plankton, however, plays an important role in supporting the island’s rich marine ecosystem.
As always, the team at Master Divers selects dive sites daily to provide the best possible conditions for divers.
Marine Life Activity
Marine life activity continues to be exciting as we move deeper into March.
Large pelagic visitors remain possible, with divers always keeping an eye out for whale sharks at deeper pinnacles and offshore dive sites around Koh Tao.
Mid-water life is also active, with schools of trevally and barracuda frequently moving through the reefs. There’s also been spotted schools of tuna cruising through the deeper pinnacles!
For macro lovers, this is a fantastic time of year. Nudibranchs, octopus and other small reef critters are increasingly visible across coral rubble areas and sandy patches. Taking a slower approach to the dive often reveals the most fascinating details of the reef.
Water Temperature & Exposure
Water temperatures remain warm at approximately 28–29°C, making exposure protection fairly light.
A 3 mm wetsuit, shorty or rash guard should be comfortable for most divers completing multiple dives per day.
Weekly Diving Outlook
Overall, the week of March 9–15 looks very promising for diving around Koh Tao. Lighter winds and relatively calm seas should provide enjoyable dive days with access to many of the island’s popular dive sites.
Morning departures are usually the calmest time to head out, and our dive team at Master Divers continues to adapt site choices daily to ensure the safest and most enjoyable dives possible.
Dive safe and see you underwater! 🐬
Forecast data based on Windy, Windguru and the Thai Meteorological Department, combined with local observations from the Master Divers team.
