What September feels like in Bangkok
September falls in Bangkok's wet season — the rainfall numbers rise clearly above the dry months. Afternoons are hot, so sightseeing works best in the morning or evening. Nights bring little relief: even the coolest hour of the night stays very warm. High humidity makes the heat feel heavier and sticky, especially on still afternoons.
Rain in Bangkok in September
Rain is part of normal life this month, falling on most days. When rain comes it is heavy, about 10.8 mm (0.4 in) per wet day, often in short, strong bursts. That is heavier than Bangkok's usual 7.6 mm per rainy day across the year. September is Bangkok's wettest month of the year.
Daylight and sunshine in September
On 15 September the sun rises at about 6:07 am and sets around 6:20 pm local time, giving 12 h 13 min of daylight. Evenings are drawing in — 22 min less daylight than mid-August. Close to the equator, sunrise and sunset times move very little through the year. Measured sunshine covers about 66% of the daylight — there are plenty of bright spells.
How September compares to the rest of the year
Ranked by average high, September comes out as the 3rd coolest month in Bangkok. Afternoons run 0.6°C (1.1°F) cooler than in August, with 115 mm more rain. Temperatures barely move from one month to the next here. The next month's average high: 30.7°C (87.3°F).
Who September suits
- Sightseeing: less ideal — rain falls on more than half the days.
- Parks & outdoor: less ideal — afternoons are too warm to linger outside.
- Museums & indoor: a good choice — with rain on most days, galleries and museums make easy plans.
Tips for visiting Bangkok in September
Rain Protection
Keep a small umbrella in your bag and wear shoes that cope with puddles.
Sun Protection
Loose, breathable clothing plus sunscreen and a wide-brimmed hat.
Quick questions
How warm is Bangkok in September?
It feels hot: typical highs are 30.9°C (87.6°F), with lows near 25°C (77°F).
Does it rain a lot in Bangkok in September?
Quite a lot — 280 mm spread over about 26 days.
What should I wear in Bangkok in September?
Pack rain protection and sun protection. There is little need to change for the evening.
Is September or October better for visiting Bangkok?
October, narrowly: it ranks #9 of 12 among Bangkok's months, against #10 for the other. October has fewer rainy days.