Andaman Sea weather update: what changed
The Phuket and Andaman Sea forecast for 21 July to 26 July 2025 points to a sustained spell of unsettled weather across the region. Below is the daily outlook as issued, followed by what it means for ferry, bus, minivan and private transfer travel.
Weather Forecast for the Andaman Sea Region, Thailand. 21 July to 26 July, 2025.
- Monday, July 21 — Temperature: 28–35°C. Weather: Widespread heavy rain. Sailing Conditions: Rough, waves 2–4 m (avoid small boats). Tide: High early morning, falling by midday.
- Tuesday, July 22 — Temperature: 27–36°C. Weather: Rain and thunderstorm risk. Sailing Conditions: Strong swells, waves up to 4 m. Tide: Low tide mid-morning, high in late afternoon.
- Wednesday, July 23 — Temperature: 28–35°C. Weather: Thunderstorms and high rainfall. Sailing Conditions: Hazardous, >4 m in storm cells. Tide: Low tide late morning, high tide early evening.
- Thursday, July 24 — Temperature: 28–35°C. Weather: Isolated heavy showers. Sailing Conditions: Rough, waves 2–4 m. Tide: Low early afternoon, rising through night.
- Friday, July 25 — Temperature: 28–36°C. Weather: Stormy with widespread rain. Sailing Conditions: Caution advised, waves 2–3 m. Tide: Midday low, evening high.
- Saturday, July 26 — Temperature: 27–37°C. Weather: Cloudy with rain and possible thunder. Sailing Conditions: Moderate to rough, waves 2–3 m. Tide: Late morning low, late evening high.
Southwest monsoon conditions
Southwest monsoon remains strong over the Andaman Sea—expect frequent heavy rain and thunderstorms. Small boats and leisure vessels should remain ashore, and larger ships must navigate cautiously, avoiding storm cells.
Who and what this affects
Sea conditions in this range matter most to island-hopping passengers. Speedboats and other small craft are the first services to be held back when waves reach 2–4 m, while larger ferries are more likely to keep running with a cautious routing. Wednesday 23 July, with hazardous conditions above 4 m in storm cells, looks like the most disrupted day of the period.
Land transport is affected differently. Buses, minivans and private transfers keep operating in heavy rain, but journey times can stretch on wet roads, and a connection built around a ferry departure may no longer line up.
Practical advice for travellers
- Check your operator's status on the day of travel — departures may be delayed, combined or cancelled at short notice.
- Leave a buffer before flights or onward connections rather than booking back-to-back.
- Use tide timings above when planning early-morning or late-evening departures from smaller piers.
- Consider a road-based alternative where one exists for your route.
Check current departures and any weather notices on our Phuket ferry routes page, and compare land options on our Thailand bus, minivan and transfer pages.
Disclaimer: Weather, sea conditions, and tide information are subject to change. Always check local updates and forecasts before planning activities. We cannot confirm operator-specific cancellations, refund terms, prices or timetables for this period from this forecast alone — check the booking page for your route.
Search availability for your dates to see which services are running.
