After 20 years of traveling to Thailand, I’ve learned what to bring, what to leave behind, and when to go. This guide cuts through the noise and tells you what actually matters.
Thailand Has Three Seasons
Cool Season (November - February)
└ Best season for travel
└ Less rain, comfortable temperatures
└ Clearest sea conditions
└ Higher prices for flights and hotels
Hot Season (March - May)
└ Hottest time of year, up to 40°C
└ Songkran water festival
└ Brutal for daytime sightseeing
Rainy Season (June - October)
└ Daily heavy downpours, usually 1-2 hours
└ Cheapest time to travel
└ Lush scenery and great fruit
└ Roads can flood
The Biggest Trap: Different Regions Have Different Rain Seasons
Thailand is long and narrow, so the weather varies dramatically by region. This catches many travelers off guard.
Bangkok (Central)
└ Hot year-round
└ Rainy season brings evening downpours
Chiang Mai (North)
└ Cool season mornings can drop to 15°C
└ February-April: smoke and PM2.5
from agricultural burning
Phuket (Andaman Sea side)
└ Rainy season: May - October
└ Many beaches closed to swimming
Koh Tao, Koh Phangan, Koh Samui
(Gulf of Thailand side)
└ Rainy season: October - December
└ Sunny in July and August
└ Better choice than Phuket
during summer holidaysThis is crucial. Travelers who visit Phuket during summer often hit the rainy season. The Gulf of Thailand islands are the smarter choice in July and August.
The Four Things You Actually Need
After all these years, it comes down to four essentials.
└ Passport (minimum 6 months validity remaining)
└ Cash (Thai baht)
└ Credit card with cash advance function
└ SmartphoneMost other things can be bought locally. Thailand has pharmacies everywhere. Travel light and buy what you need when you need it.
Do This Before You Leave
TDAC (Digital Arrival Card)
└ Register online up to 72 hours before arrival
└ Free and mandatory
Check your passport validity
└ Must have 6+ months remaining
Sort out your mobile data
└ Check if your current plan covers Thailand
└ If not, get an eSIM before departure
└ SIMs are also available at Thai airports
Install Grab
└ Register your credit card in advance
└ Makes getting around dramatically easier
Travel insurance
└ Check if your credit card includes coverage
└ If not, take out a policy before departure
For Beach Trips
└ Swimwear
└ Beach sandals
└ Reef-safe sunscreen
└ Motion sickness medication
(essential for speedboats to islands)
└ Waterproof phone caseMotion sickness medicine is not optional on island ferry routes. The boats can get rough. Bring it regardless of whether you think you need it.
Things People Forget
Something warm to wear
Long-distance buses and trains in Thailand run their air conditioning at arctic levels. Bring a light jacket or cardigan regardless of the season outside.
Temple-appropriate clothing
Temples turn away visitors in sleeveless tops, short shorts, miniskirts, or ripped jeans. Pack a light cover-up and long pants.
Wet wipes
Street food stalls and public toilets often have no paper. Wet wipes earn their weight every single day.
Reusable bag
Plastic bags are no longer provided free at convenience stores and supermarkets.
Watch Out on the Plane
Neck pillow
└ Useful for long flights
Inflatable foot rest
└ Some airlines including Thai Airways
do not permit these
└ Check the rules before packing oneNever Bring These
E-cigarettes (vapes)
└ Illegal in Thailand
└ Confiscation and heavy fines
└ Leave them at home, no exceptions
Shisha pipes
└ Also prohibited
Regular cigarettes
└ These are fineE-cigarettes are illegal in Thailand. This surprises many travelers who use them at home. Do not bring them under any circumstances.
Money and Exchange
Exchange money in Thailand, not before
└ Rates at home airports are poor
└ Bangkok exchange booths offer
far better rates
└ Look for Super Rich (green or orange signs)
Always carry cash for
└ Street food stalls
└ Tuk-tuks
└ Small local shops
└ Tips
└ Keep small bills handy (20 and 100 baht)
Credit cards work at
└ Mid to large hotels and restaurants
└ Shopping malls
└ Grab ride paymentsDon’t Worry About Food
If the local food isn’t working for you, McDonald’s, Burger King and other fast food chains are everywhere. There’s always a fallback option.
When Exhaustion Hits
Thailand is hot year-round and sightseeing drains energy fast. Every convenience store stocks energy drinks including the original Thai Red Bull. It works. Keep one handy on long travel days.
Suitcase or Backpack?
Suitcase makes sense for
└ Bangkok and Chiang Mai city trips
└ Hotel-based travel
└ Buying lots of souvenirs
Backpack makes sense for
└ Island hopping
└ Koh Tao and Koh Phangan involve
boats, beaches and sandy paths
└ A suitcase becomes a burden fastLeave These at Home
Too many clothes
└ Laundry services are cheap and everywhere
└ Buying a local t-shirt is part of the fun
Heavy guidebooks
└ Your phone handles everything
Heeled shoes
└ Bangkok pavements are uneven
└ Sneakers and sandals are all you need
Final Thoughts
The most important decisions in Thailand are timing and region. Get those right and everything else falls into place.
For everything else, the four essentials cover you. Travel light, buy what you need locally, and enjoy the fact that Thailand makes everything easy.
Just leave the e-cigarettes at home. Every time.