Thailand has two faces depending on when you visit: the dry, sunny high season that fills the beaches, and the lush, cheap green season that empties them. Neither is wrong — it depends on what you want.
Here's how to time your 2026 trip.
Dry Season (November–April): The Classic Choice
This is the best weather window. Skies are clear, humidity is low, and the islands look exactly like the brochures. November and early December are the sweet spot — great weather before the December–February peak when prices and crowds are highest.
If you want guaranteed beach weather and don't mind sharing the sand, this is your season.
Hot Season (March–May): Hot and Festive
Temperatures climb through March and April, peaking around Songkran (April 13–15), the legendary water-fight new year. It's hot, but the festival energy is unmatched. By late April the heat is intense, especially inland.
Green Season (May–October): Cheap and Lush
The monsoon scares off most tourists, which is exactly why some travelers love it. Rain usually falls in short afternoon downpours, not all day. In return you get half-price hotels, empty beaches, dramatic green landscapes, and the most relaxed version of Thailand.
September and October are the wettest months — beautiful, but pack a rain jacket and stay flexible.
A Note on the Two Coasts
Thailand's coasts have opposite weather. The Andaman side (Phuket, Krabi, Phi Phi) is best November–April. The Gulf side (Koh Samui, Koh Phangan) stays drier into the green season but gets its heaviest rain in October–November. Pick your islands to match your dates.
When to Avoid
- September–October: wettest on the Andaman coast
- Peak December–February: best weather but highest prices
Month by month
| Month | Weather | Crowds & price | Verdict |
|---|---|---|---|
| January | Dry, coolest of the year | Peak | Perfect weather, peak prices |
| February | Dry, warm, clear | Peak | The best all-round month |
| March | Heating up, Andaman still good | High, easing | Good, and the sea is warm |
| April | Hottest month, 38C+ inland | High (Songkran) | Go for the festival, not the weather |
| May | First rains, still mostly dry | Low | The best value month of the year |
| June | Afternoon showers | Low | Fine, and quiet |
| July | Showers, European holiday peak | Mid | Busier than the weather deserves |
| August | Wet, humid, green | Mid | Same |
| September | Wettest on the Andaman | Lowest | Cheap; go to the Gulf instead |
| October | Wet early, clearing late | Low | Late October is an underrated window |
| November | Dry returns, everything green | Rising | The sweet spot |
| December | Dry, cool, festive | Peak from mid-month | Great until the Christmas surge |
If you want one answer: February for the weather, November for the balance, May for the price.
The two coasts have opposite monsoons
This is the single most useful thing to know about timing a Thailand trip, and most itineraries get it wrong.
- Andaman coast (Phuket, Krabi, Koh Lanta, Phi Phi, Railay): dry November to April, wet May to October, worst in September.
- Gulf coast (Koh Samui, Koh Phangan, Koh Tao): dry most of the year but its own rainy peak in October and November, which is exactly when the Andaman is coming good.
So there is no month in Thailand with bad beach weather everywhere — there is only the wrong coast for the month. In September, go to Samui. In November, go to Phuket. Booking a Samui trip for early November because "November is high season in Thailand" is the classic mistake.
The north is a third climate
Chiang Mai, Chiang Rai and Pai are cooler and drier than anywhere else, and genuinely cold at night from December to February — 10–15°C in the hills, which surprises people who packed only for a beach.
The more important thing is burning season, roughly mid-February to mid-April. Agricultural burning across the north and neighbouring countries puts Chiang Mai among the worst air quality in the world for weeks at a time, regularly past AQI 200. The sky is white, the mountains vanish, and it is genuinely unpleasant if you have asthma. Nobody selling you a March trek will mention it. If the north is the point of your trip, come between November and January.
The festival calendar
- Songkran — 13–15 April 2026. Thai new year, nationwide water fight, the biggest event of the year. How to do it properly in Bangkok.
- Loy Krathong and Yi Peng — early November 2026. Floating lanterns on the water and, in Chiang Mai, in the sky. The most beautiful nights of the Thai year.
- Chinese New Year — mid-February. Yaowarat in Bangkok and Phuket Town go all out.
- Vegetarian Festival — late September / October. Nine days of jay food nationwide; the Phuket version involves body piercing and firewalking and is not for everyone.
- Full Moon Party, Koh Phangan — monthly. Affects island prices and ferries for several days either side.
- His Majesty's birthday (28 July), Mother's Day (12 August), Constitution Day (10 December) — public holidays; domestic transport fills up.
What the season does to your budget
Between February and September on the same island, expect:
- Hotels: 40–60% cheaper in green season. This is the big one.
- Flights from Europe and the US: 20–30% cheaper outside December–February.
- Boats, tours, diving: 20–30% cheaper, though some Andaman operators simply stop running.
- Food, transport, everyday spending: unchanged. Thailand's cost of living doesn't have a season.
Two things to plan around in green season: some small Andaman islands close entirely (Similan and Surin national parks shut from roughly mid-May to mid-October), and ferry crossings get cancelled in rough weather, so don't book a flight home for the morning after an island departure.
So which should you pick?
- First trip, want the postcard: late November to early December, or February.
- Travelling on a budget: May, or September on the Gulf side.
- Diving: Similans November to April; Koh Tao is good year-round.
- The north, trekking, cool air: November to January, and avoid mid-February to mid-April.
- Festivals over weather: April for Songkran, November for Loy Krathong.
- Avoiding crowds above all: September and October, accepting the rain.
Why a Local Friend Helps in Thailand
A Local Friend in Bangkok or the islands knows which beaches are calm when the monsoon hits one coast, where locals actually eat, and how to skip the tourist-trap tours. You message them directly and plan around what you want.
Browse Local Friends in Bangkok and plan your trip around the real Thailand.
Frequently Asked Questions
What is the best time to visit Thailand?
November to early April is the dry season and the best overall time to visit Thailand — sunny days, low humidity, and ideal beach weather. December to February is the peak (and priciest) window. For fewer crowds and lower prices, target November or March.What is the rainy season in Thailand?
The monsoon (green season) runs roughly May to October, with the heaviest rain in September and October. Rain usually comes in short, intense bursts rather than all day, so travel is still very doable — and far cheaper. The Gulf coast (Koh Samui) has a different pattern, with its wettest months in October and November.When is Songkran in Thailand in 2026?
Songkran, the Thai New Year water festival, runs April 13–15, 2026. It's the country's biggest celebration — expect nationwide water fights, temple visits, and street parties. Book early, as it's one of the busiest travel periods of the year.Which month is the best to visit Thailand?
February for the weather — dry, clear and warm everywhere. November for the balance of good weather and lower prices. May for the price, with the first rains but still mostly dry beach days at 40-60% off high-season hotel rates.Do Phuket and Koh Samui have the same rainy season?
No — they are opposite, and this is the most common Thailand planning mistake. The Andaman coast (Phuket, Krabi, Phi Phi) is dry November to April and wettest in September. The Gulf (Samui, Phangan, Tao) has its rainy peak in October and November. There is no month with bad beach weather everywhere, only the wrong coast for the month.What is burning season in Chiang Mai?
Roughly mid-February to mid-April, agricultural burning across northern Thailand and neighbouring countries pushes Chiang Mai's air quality past AQI 200 for weeks. The mountains disappear behind haze. If the north is the point of your trip, come between November and January instead.Is it worth visiting Thailand in the rainy season?
Often yes. Rain usually falls as a heavy hour in the late afternoon rather than all day, hotels are 40-60% cheaper, and the beaches are empty. The trade-offs: Similan and Surin national parks close from mid-May to mid-October, and ferries get cancelled in rough weather, so don't book a flight home for the morning after an island crossing.When are Thailand's biggest festivals in 2026?
Songkran, the nationwide water fight for Thai new year, runs 13-15 April 2026. Loy Krathong and Yi Peng, the floating-lantern festivals, fall in early November. Chinese New Year is mid-February and the Vegetarian Festival is late September into October.
