At a Glance
Compared to this destination's peak season
Bangkok in September
By Harry Nara · Last updated
Bangkok in September offers some of the best conditions of the year, ideal for vegetarian foodies & temple goers. Expect temperatures of 25–33°C, around 18 days of rain, and low crowds across the city. Daily budgets typically land around ฿500–1,500 for mid-range travellers. Rooms are easy to find last-minute and hotel prices stay noticeably softer through the season.
Contents15 sections
#Weather in Bangkok in September
Bangkok in September averages 25–33°C (77–91°F) with around 18 days of rain, and crowds are low.
| Measure | September in Bangkok |
|---|---|
| Daytime high | About 33°C / 91°F |
| Overnight low | About 25°C / 77°F |
| Rainy days | About 18, the wettest month of the year |
| Sunset | 6:30pm on the 1st, 6:09pm by the 30th |
| Season | The height of the rainy season |
| Crowds and prices | The lowest of the year |
Figures are Thai Meteorological Department 1991–2020 normals for Bangkok.
What that actually means for your trip:
- This is the wettest month. September brings the most rain of the year, usually as heavy storms in the late afternoon and evening, sometimes as a grey day of steady rain.
- Most mornings are dry. The rhythm is predictable enough to plan around: sightseeing in the morning, something indoors in the afternoon, dinner after the storm.
- Streets can flood briefly. A big downpour can leave low-lying roads under water for an hour or two; the BTS Skytrain and the MRT keep running above and below it.
- It is the cheapest month. Hotels and flights are at their lowest of the year, and the temples and markets are as quiet as they get.
Is September a good time to visit Bangkok? Yes, if you can travel flexibly. You trade daily rain for the lowest prices and the emptiest sights of the year, and the city's evenings, washed clean after a storm, are some of its best. It suits travellers who want to see Bangkok as Bangkok lives, and who are happy to spend an afternoon in a museum or a mall while the rain passes.
#What to Do in Bangkok in September
The temples, before the rain
September mornings are usually dry, so start early.
The Grand Palace and Wat Phra Kaew open at 8:30am (THB 500), Wat Pho at 8am (THB 300), and in September you will share them with Thai families and school groups rather than tour coaches.
In Chinatown, Wat Traimit houses a five-tonne solid-gold Buddha whose plaster coating cracked open in 1955, revealing the gold beneath.
Museums for the afternoon rain
Museum Siam, in a grand old ministry building near Wat Pho, tells the story of Thai identity with interactive galleries.
The Bangkok Art and Culture Centre at National Stadium BTS is free and changes its exhibitions through the year, and the Jim Thompson House nearby shows the teak home and collection of the American who revived Thai silk.
Festivals at the turn of the month
Two of Bangkok's lunar-calendar festivals fall close to September in 2027, and their exact dates are set by the calendar, not by organisers, so check before you plan around them:
- The Vegetarian Festival in Yaowarat follows the first nine days of the ninth Chinese lunar month, which in 2027 falls around the turn of September and October; Chinatown fills with yellow flags marking stalls that sell vegetarian food.
- Ok Phansa, the end of Buddhist Lent, comes three months after its start in July, so in 2027 it is expected in October; the Thai government confirms Buddhist holiday dates in its annual calendar.
Solo Travellers
Ride the Chao Phraya Express Boat the length of the river in the morning, then explore Talat Noi, the old riverside quarter of Chinatown, with its street art, machine shops and Chinese shrines. September is the month when you may have its lanes almost to yourself.
Couples
Book a riverside dinner for after the storm, when the city's lights reflect in the wet streets and the river; the terraces near Wat Arun have the best view.
A traditional Thai massage at Wat Pho's own school is the classic way to wait out a wet afternoon.
Families
Sea Life Bangkok Ocean World under Siam Paragon and KidZania at the same mall keep children happy through the rain.
Museum Siam is hands-on, and Lumphini Park's monitor lizards are best seen in the early morning before the heat.
Groups
Take a cooking class, which usually includes a market visit in the morning and a long lunch under cover.
In the evening, the bars of Thonglor and the street-food stalls of Yaowarat suit a group once the rain stops.
#Getting Around
From Suvarnabhumi, the Airport Rail Link reaches Phaya Thai in about 30 minutes for at most THB 45; from Don Mueang, take the SRT Red Line or a metered taxi.
In the city, make the BTS Skytrain and MRT your default in September: they are unaffected by rain and flooding, and their stations link to malls by covered walkways.
Grab covers the rest, and the Chao Phraya Express Boat keeps running in all but the worst storms.
#Budget & Costs
| Travel style | Per day | What it covers |
|---|---|---|
| Budget | THB 800–1,200 | Guesthouse room, street food, public transport |
| Mid-range | THB 2,500–4,500 | 4-star hotel at low-season rates, restaurant meals |
| Luxury | THB 9,000+ | Riverside hotels at their year's best prices |
September is the cheapest month of the year for a Bangkok hotel.
Costs worth knowing:
| What | Price |
|---|---|
| Airport Rail Link, Suvarnabhumi to the city | Up to THB 45 |
| Grand Palace and Wat Phra Kaew | THB 500 |
| Wat Pho | THB 300 |
| Bangkok Art and Culture Centre | Free |
| Tourist entry fee | Proposed, not yet in force |
- The 450-baht tourist entry fee was proposed in 2026 but still needs Cabinet approval; check before you travel.
- Grab fares surge in heavy rain; the Skytrain costs the same in any weather.
- Book the best hotels at low-season prices; September is when the luxury riverside hotels are most affordable.
#Where to Stay in Bangkok in September
September is the wettest month of the rainy season and the emptiest month Bangkok has. Rain still arrives most afternoons and evenings, but the city is at its least crowded and least expensive, which changes what your money buys: the boutique places that are booked out in January are available, and the big hotels are discounting. The transport logic from August still applies, so a Skytrain connection remains worth more than a fashionable address, but with fewer people around you can afford to be slightly further from the middle of things.
- Splurge: Ariyasom Villa (Sukhumvit 1). A family-owned boutique in 1940s Thai heritage style, built around a garden with an outdoor pool, an organic restaurant and a spa. In a quiet month a small hotel like this is at its best, and it sits 750 metres from Phloen Chit BTS, five minutes by Skytrain from Siam Paragon and CentralWorld.
- Sweet spot: Pathumwan Princess Hotel (Siam). Directly connected to National Stadium BTS and attached to MBK, which is the practical answer to September's evening rains. Ten dining options, an outdoor pool and a tennis court, with panoramic skyline views from floor-to-ceiling windows.
- Budget: Eastin Grand Hotel Phayathai (Phayathai). Fifty metres from Phaya Thai BTS and the Airport Rail Link, with an infinity pool and a spa. September pricing here is some of the best value in the city, and the airport link makes a short trip genuinely frictionless.
September is the cheapest end of Bangkok's low season and the last month before rates start climbing towards the cool-season peak in November and December. If you are comfortable planning around afternoon rain, it buys you more hotel than any other month of the year. Each link opens Booking.com with September dates already filled in and that property at the top of the results. Nothing is locked in from there: change the dates, switch neighbourhood, or search an entirely different destination in the same visit.
For the other neighbourhoods, and every hotel we have verified across Bangkok, see our full guide to where to stay in Bangkok.
Hotel links are affiliate links. We may earn a small commission if you book, at no extra cost to you.
#Food & Dining
September is a good month for Bangkok's wet-season food:
- Boat noodles, small, rich bowls of noodle soup eaten by the stack, in Thonburi and around Victory Monument.
- Tom yum and khao tom, hot soups and rice porridge for a rainy evening.
- Mangosteen and rambutan, the end of the rainy-season fruit, at the markets.
- Jay food, vegetarian dishes from yellow-flagged stalls, when the Vegetarian Festival begins.
Or Tor Kor market by Chatuchak has the city's best fruit, under cover.
In Yaowarat, the street-food stalls keep cooking under umbrellas through the rain.
#Nightlife
September nights are humid but often clear after the evening storm.
The rooftop bars, Sky Bar at the Lebua among them, close their open terraces in heavy rain, so check before you go up.
Thonglor and Ekkamai have the city's best cocktail bars, mostly indoors, and the riverside bars near Wat Arun are at their most atmospheric late in the evening.
#Shopping
The malls, Siam Paragon, ICONSIAM and CentralWorld, are where Bangkok shops when it rains, and MBK Center is the place for phones and electronics.
Chatuchak Weekend Market is partly covered, but its open alleys flood in a storm; go early in the morning.
In Pahurat, the Indian textile district by Chinatown, fabric shops are under cover.
#Culture & Etiquette
- Dress for temples: covered shoulders and knees, shoes off in the halls.
- Respect the monarchy: royal portraits and anthems deserve respect.
- During the Vegetarian Festival, visitors are welcome at the stalls, but photograph shrines and devotees at a respectful distance.
- Tipping is small: round up in restaurants, THB 20–50 after a massage.
#Essential Local Phrases
| Phrase | Thai | Pronunciation |
|---|---|---|
| Hello | สวัสดี | Sa-wat-dee (khrap/kha) |
| It's raining | ฝนตก | Fon tok |
| Is this vegetarian? | อาหารนี้เป็นเจไหม | A-han ni pen jay mai? |
| How much? | เท่าไหร่ | Tao-rai? |
| Please use the meter | เปิดมิเตอร์ด้วย | Perd mi-toe duay |
| Delicious! | อร่อยมาก | A-roi mak! |
| Thank you | ขอบคุณ | Khop-khun (khrap/kha) |
#Packing List
- A compact umbrella and a light rain jacket
- Quick-drying clothes and sandals
- A waterproof phone pouch and a dry bag
- Clothes that cover shoulders and knees for temples
- Insect repellent; mosquitoes are busy in the rainy season
- A light layer for cold air-conditioning
- Anti-fungal powder or cream for damp feet
- A power bank for long days indoors
#Backup Plans
If the rain sets in for the day: spend it at Museum Siam, the Jim Thompson House and the BACC, linked by the Skytrain, with a long lunch at ICONSIAM's Sooksiam food hall.
If the river boat is suspended in a storm: take the MRT, which reaches the old town at Sanam Chai station by Wat Pho.
If the festivals do not fall in your dates: Yaowarat is worth an evening in any week, and the temples hold candlelit ceremonies on many full-moon nights.
#Safety & Health
September is Bangkok's flood month. Avoid wading through floodwater, which hides open drains and carries dirty runoff, and keep to the Skytrain and MRT during big storms. Mosquito-borne dengue peaks in the rainy season, so use repellent, especially at dusk. Wet marble temple floors and pavements are slippery. Tap water is not for drinking.
Emergency: 191 for police, 1669 for an ambulance, 1155 for the English-speaking Tourist Police.
#What's New for September 2027
- The Vegetarian Festival follows the ninth Chinese lunar month, around the turn of September and October in 2027
- Ok Phansa, the end of Buddhist Lent, is expected in October in 2027
- Sanam Chai MRT station serves Wat Pho and the old town in any weather
- The 450-baht tourist entry fee is still a proposal
- Grand Palace entry is THB 500, Wat Pho THB 300
#About This Guide
By Harry Nara (founder of WhenToWander), updated October 2026 for September 2027. Climate figures are Thai Meteorological Department 1991–2020 normals. Dates and facts verified against:
- Thai Meteorological Department for climate normals
- Tourism Authority of Thailand for festivals and the Buddhist calendar
- Nation Thailand for the proposed entry fee
- Museum Siam for the museum
- Bangkok Art and Culture Centre for exhibitions
For the season as a whole, see Bangkok in the monsoon, and for the festival month that follows, Bangkok in October.
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Frequently Asked Questions
Is September the wettest month in Bangkok?
Yes — September is the peak of the monsoon, with 18–21 rainy days. Sukhumvit and Old Town low-lying streets occasionally flood briefly after the heaviest storms. The BTS Skytrain and MRT subway are unaffected. Plan flexibly and embrace the drama.
Are there any festivals in Bangkok in September?
Few, and the ones that come close follow the lunar calendar. The Vegetarian Festival in Yaowarat follows the first nine days of the ninth Chinese lunar month, around the turn of September and October in 2027, and Ok Phansa, the end of Buddhist Lent, is expected in October. Check the Tourism Authority of Thailand for confirmed dates before you plan around either.
Is it worth visiting Bangkok in September?
If you want the cheapest prices and emptiest sights of the entire year, yes. The trade-off is daily rain — usually as predictable afternoon storms but occasionally as multi-day grey weather. Pack rain gear, plan around the rain, and you'll save 40–50% off peak prices.
Do flights into Bangkok get delayed in September?
Occasionally — heavy thunderstorms can delay flights by 30–90 minutes. Major typhoons in the South China Sea can cause longer disruptions, though direct hits on Bangkok are rare. Build a buffer day if you have onward connections to Phuket or Krabi.
What’s the weather like in Bangkok in September?
Bangkok in September typically sees temperatures of 25–33°C with around 18 days of rain across the period. Pack light, breathable layers and strong sun protection — days get genuinely hot.
How much does it cost to visit Bangkok in September?
Budget-conscious travellers can expect daily costs of ฿500–1,500, covering accommodation, food, and local transport. Quieter periods usually push prices toward the lower end of this range.