Andaman Sea forecast: 16–21 September 2025
This Phuket and Andaman Sea forecast covers the six-day window from Tuesday 16 to Sunday 21 September 2025, so you can see how weather, wind and tides may affect ferries, buses, minivans and private transfers around Phuket and the wider Andaman coast.
Weather Forecast for the Andaman Sea Region, Thailand. 16 to 21 September, 2025.
Day-by-day outlook
- Tuesday, September 16 — Temperature: 33–25 °C. Weather: Heavy rain, 60% of area. Sailing Conditions: Winds >19 km/h, choppy conditions. Tide: Low tide morning, high evening.
- Wednesday, September 17 — Temperature: 32–26 °C. Weather: Heavy rain, 70% of area. Sailing Conditions: Winds >22 km/h, rough seas. Tide: Low tide morning, high evening.
- Thursday, September 18 — Temperature: 32–26 °C. Weather: Heavy rain, 70% of area. Sailing Conditions: Winds >26 km/h, unsafe for small craft. Tide: Low tide morning, high late evening.
- Friday, September 19 — Temperature: 32–25 °C. Weather: Heavy rain, 70% of area. Sailing Conditions: Winds >22 km/h, poor visibility at sea. Tide: Low tide early morning, high night.
- Saturday, September 20 — Temperature: 33–26 °C. Weather: Heavy rain, 60% of area. Sailing Conditions: Winds >20 km/h, unsettled seas. Tide: Low tide morning, high late night.
- Sunday, September 21 — Temperature: 33–25 °C. Weather: Heavy rain, 40% of area. Sailing Conditions: Winds >19 km/h, moderate sea conditions. Tide: Low tide morning, rising afternoon.
What changed this week
Conditions build mid-week and then ease. Rain coverage rises from 60% of the area on Tuesday to 70% from Wednesday through Friday, before falling back to 60% on Saturday and 40% on Sunday. Winds peak on Thursday at more than 26 km/h, described as unsafe for small craft, and Friday adds poor visibility at sea. By Sunday the forecast returns to moderate sea conditions. Temperatures stay steady throughout, with highs of 32–33 °C and lows of 25–26 °C.
Who this affects
Sea conditions matter most for ferry and speedboat passengers travelling between Phuket and the islands, and for anyone connecting onward by boat. Thursday and Friday are the days most likely to see delays, altered departure times or cancellations, particularly for smaller vessels.
Land services — buses, minivans and private transfers along the Andaman coast — normally continue to run, but heavy rain can slow journeys and affect pick-up timings. If your trip combines road and sea legs, allow extra time between connections.
Practical tips for travellers
- Check your operator's latest status on the day of travel, as decisions to sail are made locally and at short notice.
- Where possible, travel earlier in the day and avoid tight same-day connections to flights.
- Low tides fall in the morning across most of the week, which can affect boarding at shallow piers and beach pick-ups.
- Pack rain gear and keep valuables in a dry bag on open-deck crossings.
- Review the cancellation and change conditions shown for your ticket before you book.
Plan your Andaman Sea trip
Live departure times, operators and prices are shown at the moment of booking. Compare options on popular Andaman routes such as Phuket to Koh Phi Phi, Phuket to Krabi and Phuket to Koh Lanta, or browse everything leaving from Phuket.
Disclaimer: Weather, sea conditions, and tide information are subject to change. Always check local updates and forecasts before planning activities.
Search availability for your dates and book your Andaman Sea travel with confidence.
