01Weather
Bangkok weather in September
Afternoons in September average 33.2 °C (92 °F) and nights cool to 25.8 °C (78 °F). The month brings about 445 mm (17.5 in) of rain spread over roughly 24 days. Compared with August it is 0.5 °C cooler; October is 0.0 °C warmer again.
What the averages hide
| In a typical September | Value | What it means |
|---|---|---|
| Warm afternoons (90th percentile) | 35 °C / 95 °F | one day in ten is at least this warm |
| Cool afternoons (10th percentile) | 31 °C / 88 °F | one day in ten stays below this |
| Cold nights (10th percentile) | 24 °C / 76 °F | one night in ten is colder than this |
| Days above 30 °C (86 °F) | 29.5 | per month, average 2016–2025 |
| Nights at or below 0 °C (32 °F) | 0.0 | frost mornings per month |
| Chance of rain on any given day | 80 % | at least 1 mm |
| Hottest / coldest September day 2016–2025 | 37.2 °C / 23.5 °C | extremes in the ten-year record |
02Daylight
Sunrise, sunset and the length of the day
| Date | Sunrise | Sunset | Daylight |
|---|---|---|---|
| 1 September | 06:06 | 18:29 | 12.4 h |
| 15 September | 06:06 | 18:19 | 12.2 h |
| 30 September | 06:07 | 18:08 | 12.0 h |
Daylight shrinks by about 24 minutes over the month. Times are local (Asia/Bangkok).
03Crowds
How busy Bangkok is in September
quiet The main sights are quiet in September. What drives it:
- wettest month
- flooding risk
- cheapest hotels
05Events
What's on in Bangkok in September
No major recurring events fall in September.
07Packing
What to pack for Bangkok in September
- light, breathable clothing
- sun hat and sunscreen
- refillable water bottle
- a compact umbrella or hooded rain jacket, rain falls on roughly one day in three
- something for heat: 30 days a month pass 30 °C on average
08Editor's notes
What the numbers don't tell you
September is the wettest month, with rain on about 23 days, the heaviest and longest spells and the real possibility of street flooding after a big storm. It is the quietest and cheapest time of year, with afternoons around 32 °C. Build itineraries around indoor afternoons and dry mornings, and allow extra time for taxis when it rains. The Vegetarian Festival can begin in late September.
Hotel rates are at their lowest, and the luxury riverside hotels offer their best packages. The canals and the Chao Phraya can overflow in a wet year, affecting low-lying districts rather than the tourist centre. The malls, the aquarium at Siam Paragon and the cinemas are the standard wet-day circuit. For the end of the rains and Chulalongkorn Day, see October.
09Compare
Bangkok month by month
| Month | High | Low | Rain days | Sun h | Crowds | Verdict |
|---|---|---|---|---|---|---|
| January | 33 °C | 24 °C | – | – | very busy | Mixed |
| February | 34 °C | 25 °C | – | – | very busy | Mixed |
| March | 35 °C | 27 °C | – | – | busy | Good |
| April | 36 °C | 28 °C | – | – | busy | Good |
| May | 36 °C | 28 °C | 22 | – | moderate | Mixed |
| June | 35 °C | 27 °C | 21 | – | quiet | Mixed |
| July | 34 °C | 26 °C | 22 | – | quiet | Mixed |
| August | 34 °C | 26 °C | 23 | – | moderate | Mixed |
| September | 33 °C | 26 °C | 24 | – | quiet | Mixed |
| October | 33 °C | 26 °C | 22 | – | moderate | Mixed |
| November | 33 °C | 25 °C | – | – | busy | Good |
| December | 33 °C | 24 °C | – | – | very busy | Mixed |
Not sure about September? See the best time to visit Bangkok.
10Elsewhere
September in nearby cities
| City | High | Rain days |
|---|---|---|
| Singapore in September | 32 °C | 11 |
| Shanghai in September | 30 °C | 12 |
| Beijing in September | 28 °C | 8 |
| Seoul in September | 27 °C | – |
| Kyoto in September | 30 °C | 10 |
| Tokyo in September | 28 °C | 12 |
11FAQ
Bangkok in September: your questions
Is September a good time to visit Bangkok?
September is a reasonable month with trade-offs to visit Bangkok. Daytime highs average 33 °C (92 °F), rain falls on about 24 days, and hotel arrivals run above the yearly average, so the main sights are quiet.
What is the weather like in Bangkok in September?
Expect hot days around 33 °C (92 °F) and nights near 26 °C (78 °F). One September in ten brings afternoons above 35 °C, and one in ten stays below 31 °C.
Does it rain a lot in Bangkok in September?
September brings about 445 mm (17.5 in) of rain over roughly 24 days, which is wet by Bangkok standards. On any given day the chance of at least 1 mm of rain is 80 percent.
What should I wear in Bangkok in September?
Pack light, breathable clothing, sun hat and sunscreen, refillable water bottle.
Is Bangkok crowded in September?
The main sights are quiet in September. Main drivers: wettest month; flooding risk; cheapest hotels.
What time does it get dark in Bangkok in September?
Around the middle of September the sun sets at about 18:19 and rises at 06:06, giving 12.2 hours of daylight.