Phuket and Andaman Sea Forecast: 15–20 July 2025
The latest Phuket and Andaman Sea forecast covers Weather Forecast for the Andaman Sea Region, Thailand, 15 July to 20 July, 2025. This six-day outlook is published to help travellers understand sea state before they book or travel, and it is updated as new information becomes available.
Day-by-Day Outlook
- Tuesday, July 15 — Temperature: 26–31°C. Weather: Scattered showers with brief sun. Sailing Conditions: Moderate, waves around 1.4m. Tide: High tide morning, low tide early afternoon.
- Wednesday, July 16 — Temperature: 27–31°C. Weather: Partly sunny with light showers. Sailing Conditions: Slightly calmer seas, ~1.2m waves. Tide: Low tide mid-afternoon.
- Thursday, July 17 — Temperature: 27–30°C. Weather: Intermittent rain and cloudy skies. Sailing Conditions: Moderate to rough, waves 1.4–1.6m. Tide: High tide mid-morning, low tide late afternoon.
- Friday, July 18 — Temperature: 26–30°C. Weather: Thunderstorms likely. Sailing Conditions: Rough, wave height up to 1.7m. Tide: Low tide early evening.
- Saturday, July 19 — Temperature: 26–31°C. Weather: Rain and isolated storms. Sailing Conditions: Challenging, waves near 1.6–1.8m. Tide: High tide late morning, low tide evening.
- Sunday, July 20 — Temperature: 26–30°C. Weather: Cloudy with light rain. Sailing Conditions: Moderate, waves 1.4–1.6m. Tide: Low tide afternoon, rising tide evening.
How Conditions Change Across the Week
Seas are at their calmest on Wednesday, with waves near 1.2m, then build steadily. The roughest stretch runs from Friday to Saturday, when thunderstorms are likely and wave height reaches 1.7–1.8m. Sunday eases back to moderate conditions.
Temperatures stay steady all week, between 26°C and 31°C, so the deciding factor for your day is sea state and rainfall, not heat.
Who This Affects
Sea conditions in this forecast matter most for passengers on ferry and speedboat crossings between Phuket and the surrounding islands. Smaller, faster boats feel swell more than larger vessels, so a 1.7m day is felt differently depending on the service you book.
Land services such as buses, minivans and private transfers are less affected by waves, though heavy rain and thunderstorms can slow road journeys. If your trip combines road and sea legs, allow extra time between connections.
Practical Tips for Travellers
- Book morning departures where possible — storms in this outlook are weighted toward afternoon and evening.
- Check tide times listed above if your pier uses a beach or shallow-water boarding point.
- Keep bags in waterproof covers on open-deck crossings during showery days.
- Operators may delay or cancel sailings in rough weather; confirm your departure on the day of travel.
Booking Around the Weather
Departure times, operators, vessel types and fares vary by route and travel date. Rather than assuming a fixed schedule during unsettled weather, check the live results for your specific crossing, including any ferry and transfer routes from Phuket and connections to nearby Andaman Sea island destinations.
Disclaimer: Weather, sea conditions, and tide information are subject to change. Always check local updates and forecasts before planning activities.
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