Phuket stays warm year-round, but the season changes how easy the trip feels. Dry-season months are better for beach days and boat trips; wet-season months can still work if you plan around rain, surf and rougher Andaman seas. For the country-wide picture, read best time to visit Thailand alongside this Phuket-specific guide.
Quick answer
Phuket is easiest from November to April, when seas are usually calmer and dry days are more common. May to October is wetter and can bring rough Andaman seas, but it can still suit a flexible trip with indoor alternatives and refundable boat plans.
| Best for | Months | What to expect | Main tradeoff |
|---|---|---|---|
| Beach weather | November to April | Drier days and calmer sea conditions | Higher demand in peak months |
| Flexible lower-season trip | May to October | Warm weather with more rain | Prices and crowds still vary by date and area |
| Surf and quieter beaches | Wet season | More swell on west-coast beaches | Swimming flags matter more |
| First-time family trip | Dry season | Easier beach and boat planning | Book earlier for popular areas |
| Dive / island day boats | Prefer dry season | More reliable Andaman departures | Still check marine forecasts daily |
How we picked these Phuket weather windows
We compared the pattern travellers feel on the ground: rain risk, sea conditions, boat reliability, beach safety flags, demand and how much itinerary flexibility you need. The figures below are 1991-2020 climate averages for Phuket, set against the Thai Meteorological Department (TMD) station record for 1981-2010. Any single week can differ, so check the forecast and marine advisories before boat days.
How to choose
Choose dry season for the easiest beach and boat trip. Choose wet season only if you are happy to swap days around and keep Old Town food, spa, shopping or indoor pool plans in reserve. If diving or Similan day trips are central, cross-check scuba diving in Thailand and the Andaman park calendar before locking flights.
Overview of Phuket weather
Phuket stays warm throughout the year. Using 1991-2020 averages, the daily high sits between 31.4 C (September) and 34.3 C (March), and the overnight low between 22.7 C (January) and 24.3 C (May to August). The yearly mean is about 28 C. The TMD station record for Phuket town (1981-2010) shows the same shape, with daily highs of 31.5-34.0 C.
| Month | Avg high (C) | Avg low (C) | Rainfall (mm) | Rainy days | Sea temp (C) |
|---|---|---|---|---|---|
| January | 32.7 | 22.7 | 35 | 4 | 28.5 |
| February | 33.9 | 22.9 | 40 | 3 | 28.5 |
| March | 34.3 | 23.5 | 75 | 6 | 29.5 |
| April | 34.0 | 24.1 | 125 | 15 | 30 |
| May | 32.8 | 24.3 | 295 | 19 | 30 |
| June | 32.3 | 24.2 | 265 | 19 | 29.9 |
| July | 31.9 | 24.3 | 215 | 17 | 29.6 |
| August | 31.6 | 24.3 | 245 | 17 | 29.4 |
| September | 31.4 | 23.8 | 325 | 19 | 29.2 |
| October | 31.5 | 23.5 | 315 | 19 | 29 |
| November | 32.0 | 23.3 | 195 | 14 | 29 |
| December | 31.9 | 22.9 | 80 | 8 | 28.5 |
Source: Climates to Travel, Phuket averages for 1991-2020. A rainy day here means a day with measurable rain, and the count shifts a little with the threshold a source uses.
March and April are the hottest months, with highs of 34 C or more. April also brings the first heavy rain: 125 mm and about 15 rainy days, against 75 mm and 6 days in March.
Rainfall changes far more than temperature. May to October each get 215-325 mm, with September (325 mm) and October (315 mm) the wettest, and 17-19 rainy days a month. That does not mean rain all day, but it is too frequent to promise a dry afternoon. The yearly total is about 2,210 mm over roughly 160 rainy days.
November is the transition month, with 195 mm and 14 rainy days. December (80 mm), January (35 mm) and February (40 mm) are the driest, with 3-8 rainy days each.
The sea is warm all year. It runs about 28.5 C in December to February and peaks at 30 C in April and May, so water temperature never decides the month. Wave height and swell do, which is why the rough-sea warnings above matter more than the thermometer.
Best time to visit Phuket for weather
The dry season runs from November through April; the wetter season from May to October.
Dry season (November–April): Drier weather and calmer seas usually make beach and boat planning easier, especially from December through March. These are also commonly the busiest months, so book popular accommodation and limited-capacity trips earlier. November and April sit near the seasonal edges and can still bring rain.
Wet season (May–October): Keep the itinerary movable. Some showers pass quickly, but prolonged rain, thunderstorms and rough seas also occur. Check the forecast each morning and avoid treating a clear hour as proof that a boat trip or west-coast swim is safe.
For the easiest beach trip, start with November to April. For a wet-season trip, compare current room rates and avoid locking every day into a boat tour. Country-wide season logic lives in best time to visit Thailand.
Planning tips by weather
Bring light, breathable clothing, sun protection, sandals and a light rain layer. A dry bag helps on boat and scooter days. Air-conditioned rooms and vehicles can feel cool, but wool is unnecessary for Phuket’s tropical lowlands. See the Thailand packing list for a fuller kit list.
In the dry season, swimming and beach time are easier to plan, though rip currents can still occur. Between May and October, keep hiking, Old Town food, spa and flexible island plans in reserve, and check sea conditions before boat trips. For activity ideas that work when rain arrives, use things to do in Phuket; for evening options, see Phuket nightlife.
For a wet-season stay, choose accommodation with useful indoor space and easy access to restaurants or shops. Check the property’s current facilities rather than assuming a pool or spa is covered. Family travellers can compare family resorts in Phuket and check each property’s current facilities (pools, kids’ clubs and opening hours) before booking.
Weather-aware planning is simple: keep outdoor plans early, add indoor backups, and check marine conditions before beach or boat days.
Weather variability and longer-term change
Individual years swing well away from the averages. Monsoon onset, the number of rainy days and heavy-rain spells all move from year to year, so a “dry” January can still bring a wet week. Use the 1991-2020 averages in the table to choose a month, then the current TMD forecast for the actual week.
Resources for Phuket forecasts
Check the forecast close to departure and again before any boat day. Seasonal averages help with planning. Local rain, wind and surf conditions decide what is sensible on the day.
The Thai Meteorological Department publishes current conditions, seven-day forecasts, regional marine forecasts and weather advisories. Use those official pages first, then compare a reputable hourly forecast for short-term rain timing. Tour operators and hotels can explain operational changes, but TMD warnings should guide decisions about heavy rain and dangerous sea conditions.
Plan around the forecast
Use the season to choose your month, then use current forecasts to shape the actual week. Dry season is simpler for beaches and boats; wet season needs looser plans and more respect for red flags, rough seas and sudden rain.
Start with the Phuket visit hub for lodging and area context, then best time to visit Thailand for how Phuket sits against Chiang Mai, the Gulf islands and the rest of the country. Divers should also read scuba diving in Thailand; island hoppers can compare routes in most beautiful islands and Thailand island hopping.
