Thailand has three seasons depending who you ask. The conventional wisdom (“visit in dry season”) misses regional differences. Here’s the honest 2026 breakdown for Bangkok, Chiang Mai, and the islands.
Last verified: May 6, 2026.
The three seasons
- Cool dry season: November – February. Lower humidity, comfortable temperatures. Tourist peak.
- Hot dry season: March – May. Brutal temperatures (35–42°C). Songkran in mid-April.
- Wet season: June – October. Daily afternoon thunderstorms; mornings often clear. Tourist trough.
The short answer
Best overall: November to February. But: this is when crowds peak and prices double. Excellent alternative: late September through October — rain is winding down, prices are still low, crowds light.
Bangkok
- Best: November–February (cool, dry, comfortable)
- Worst: April (40°C+ heat) and June–July (humid pre-monsoon)
- Cheapest: September
Chiang Mai
- Best: November–February (cool, festival season)
- Worst: February–April. Burning season — agricultural fires + climate makes air quality genuinely dangerous (AQI 200+). Don’t come if you have respiratory issues.
- Best for hikers/trekkers: November (waterfalls full, no haze)
See our Bangkok vs Chiang Mai comparison.
The islands
Crucial: Thailand’s east and west coasts have OPPOSITE seasons.
West coast (Andaman side): Phuket, Krabi, Koh Phi Phi, Koh Lanta, Similan, Surin
- Best: November–April (calm seas, snorkeling, diving)
- Avoid: May–October (some boats stop running; rough seas)
East coast (Gulf side): Koh Samui, Koh Phangan, Koh Tao
- Best: February–April (driest, calmest)
- Avoid: October–December (peak rain on this coast)
This means: February–April is the only window when both coasts are great. But it’s also peak season everywhere; expect crowds.
Festivals to plan around (or avoid)
- Songkran (Thai New Year): April 13–15. Massive water-fight festival; everything closed; tourist crowds extreme. Skip if you’re not into the chaos.
- Loi Krathong: Mid-November. Lantern festival, beautiful in Chiang Mai (Yi Peng).
- Chinese New Year: February. Bangkok’s Chinatown gets very busy.
Practical bookings
- Christmas-New Year week: book hotels 2–3 months ahead in major destinations
- Songkran: book April flights 2 months ahead
- Tour bookings via GetYourGuide: 1–2 weeks ahead in shoulder, 3–4 weeks in peak
For long-stay visitors considering Thailand beyond just visits, see our DTV visa guide and things to do in Bangkok.
✓ Last verified: May 6, 2026.
Practical tips that make the difference
- Plan in advance: book major attractions + restaurants 4-8 weeks ahead in peak season. Cancellation is usually free up to 24-48 hours before arrival
- Use the local apps: country-specific transport, payment, and food delivery apps work better than generic international ones. Examples: Grab in SE Asia, Bolt in Europe, DiDi in China, MTR app in Hong Kong
- Carry small cash: card acceptance varies; small amounts in local currency saves moments. Always have $50-100 equivalent in cash for emergencies
- Travel insurance: even a $50 policy saves you from $5,000+ medical bills. Doctor visits abroad average $30-150; emergency rooms can run $1,500-15,000 for serious cases
- Photograph everything important: passport, BRP, important addresses, emergency numbers, insurance policy, contact details. Store in cloud + offline
- Get an eSIM before you fly: avoid paying $10-15/day in roaming charges. Airalo and Holafly start at $4 for short trips
Common mistakes to avoid
- Booking too tight: build 30-50% buffer between commitments. Strikes, weather, jet lag all cause delays
- Skipping local etiquette: brief research on greetings, tipping, and dress codes saves embarrassment
- Eating at tourist-trap restaurants near monuments: walk 2-5 minutes off main squares for better food at lower prices
- Underestimating walking: most European + Asian cities are walked, not driven. Comfortable shoes essential. Plan for 15,000-25,000 steps per day on active travel
- Ignoring transit cards: city travel cards (Oyster, Suica, Navigo, etc.) are 30-50% cheaper than single tickets
- Booking accommodation by stars rating only: read reviews from past 6 months specifically. Old reviews can mislead about current state
Money-saving strategies
- Free walking tours: most major cities have tip-based walking tours. Excellent way to orient yourself + learn history. Sandeman, Free Tour brand operate in 30+ cities
- Lunch menus vs dinner: many restaurants offer lunch fixed-price menus 30-50% cheaper than equivalent dinner
- Public transport day passes: usually 2-3x cheaper than 4 single tickets
- Book flights mid-week, fly Tuesday/Wednesday: typically cheapest days. Avoid Friday and Sunday flights
- Hostel private rooms: 20-30% cheaper than hotels for similar quality. Many have great social common areas
- Local SIM cards in 3+ week stays: cheaper than eSIM for longer stays in single country
When to consider a guide or local expert
For more complex situations — multi-country tax planning, complicated visa applications, or substantial property purchases — engaging a regulated professional saves money and stress in the long term. Look for: OISC-registered immigration advisers (UK), Spanish gestores (Spain), German Steuerberater (Germany), or cross-border tax specialists (any country). For travel-specific questions, local certified tour guides offer expertise generic guides can’t match.