February 16 – February 22
Location: Koh Tao, Gulf of Thailand
As we move deeper into February, conditions around Koh Tao continue to stabilize. The stronger northeast monsoon influence has eased, giving way to lighter winds, manageable swell and increasingly consistent dive days. Overall, this week is shaping up to offer comfortable boat crossings, good underwater visibility and exciting marine life encounters.
☀️ Rain & Cloud Cover
Expect a mix of sunshine and passing cloud throughout the week. While brief showers are still possible, particularly in the late afternoon or overnight, prolonged rainfall is unlikely.
Mornings are expected to be the calmest and brightest part of the day — ideal for travel to more exposed dive sites and for maximizing underwater visibility.
💨 Wind Overview
Northeasterly winds remain present but are noticeably lighter compared to previous weeks. Wind speeds are forecast to range between light and moderate, generally creating only mild surface chop.
These softer wind conditions should allow access to a broad selection of dive sites around the island, with fewer weather-related restrictions.
🌊 Swell & Sea State
Swell direction remains primarily NE to E, averaging approximately 0.5–1.2 metres.
Exposed eastern dive sites may experience light surface movement, particularly during peak wind periods. However, west and southwest-facing bays are expected to remain well protected and calm. Overall sea state is suitable for training dives, fun divers and longer dive excursions.
🌙 Tides & Currents
Koh Tao continues to experience its typical semi-diurnal tidal cycle, with two high tides and two low tides each day.
Mild currents may be present at deeper pinnacles and around headlands, but nothing outside normal seasonal expectations. Dive timing will continue to optimize entries during more favourable tidal windows.
👁️ Underwater Visibility
Visibility remains variable but generally good for this time of year. Plankton levels may fluctuate slightly depending on wind and tide, occasionally softening clarity — but these nutrient-rich conditions often increase the chances of larger pelagic encounters.
Sheltered sites are expected to offer clearer conditions throughout the week.
🐋 Marine Life Highlights
February continues to bring exciting underwater activity around Koh Tao.
Whale shark reports have kept the dive community alert and hopeful, with conditions still supportive for further sightings. Deeper sites and offshore pinnacles remain prime locations for potential encounters.
Eagle rays have continued cruising through areas such as Mango Bay, offering graceful mid-water sightings for lucky divers. Schools of fusiliers, trevally and reef fish remain active across many sites.
On the macro side, nudibranch juveniles are increasingly visible across the reefs. Patient divers focusing on sandy patches and coral rubble are being rewarded with tiny sea slugs, shrimps and other cryptic marine life.
The balance between big blue potential and detailed macro exploration makes this an especially rewarding time to dive.
🧭 Diver Tips for the Week
Water Temperature:
Approximately 28–29°C. A 3mm wetsuit or shorty provides comfortable protection for most divers.
Best Dive Times:
Morning dives continue to offer the calmest surface conditions and best overall clarity.
What to Bring:
A camera, good buoyancy control and an eye for detail — whether you’re scanning the blue for pelagics or searching the reef for macro treasures.
Forecast based on regional models and local observation around Koh Tao. As always, island weather can shift quickly, and daily dive plans adapt accordingly. We use Windy and Windguru.
Another beautiful week to be underwater in Koh Tao 💙🌊
