What is the weather in Bangkok, in one minute?
Hot all year, with one main variable: rain. Highs stay between 31° and 34° in every month, and nights between 22° and 27°. The dry, least humid stretch is November to February. March and April are the heat. From May the rains build, and September and October are the wettest months.
Bangkok: Average high and low temperature, °C
Bangkok: Rainfall, mm
Averages 2015-2025 · Source: Open-Meteo, CHIRPS · How we measure
Read the chart from the left. The flat run at the start and the end of the year is the dry season, the hump in the middle is the rains, and the two highest points of the temperature band are March and April. For a one-page view of the city, the Bangkok destination page is quicker; this page is the month-by-month version.
Where to be next: your month-by-month route, $19
A route for your months with a leave-by date for each stop, a backup, and the seasonal traps on your path. Drafted from 11 years of weather data, every number checked against it, in your inbox within 48 hours. Not included: visas, insurance or bookings.
When is the cool season in Bangkok?
November to February, and "cool" is relative. Highs are 31° from November to January and 32° in February; nights fall from 24° in November to 22° in December and January. What changes is the air, not the heat: rain drops from 77 mm in November to 9 mm in December, and humidity falls from 74% to about 65% in December and January.
December and January are the best pair: about one rainy day each, the lowest humidity of the year and clear skies. November is a gentle start, with the rains mostly over but about 6 rainy days. February is slightly warmer and still very dry.
How hot does Bangkok get in March and April?
March and April are the hottest months: 34° highs, and nights of 26° to 27°, so the city barely cools after dark. Humidity is about 72%, which is what makes it feel hotter than the number. The first rain arrives in April, 69 mm on about 7 rainy days, often as an afternoon storm that clears the air for an hour.
If you work from an air-conditioned cafe or a coworking space, these months are manageable. In a room without air conditioning, April is the month to avoid.
When are the rains in Bangkok, and are they bad?
May to October. Rain is 169 to 203 mm a month from May to August, then 315 mm in both September and October, with rainy days going from about 12 in May to about 20 in September. Humidity is 76% to 83% and the sky is mostly cloud.
It is not a washout most days: the pattern is a short, heavy shower, often in the afternoon, and then it is dry again. The real problem is September and October, when rain is heaviest and some streets flood. If you can work indoors, June to August are the easiest wet months.
What about the haze?
Bangkok has its own smoke-and-traffic season, and it overlaps the best weather months: the same still, dry air that gives December and January their low rain also traps pollution. Bangkok air quality by month has the monthly numbers from our model, how much they change from one year to the next, and cleaner bases on the coast. For planning, check the air as well as the temperature for October to March. June to September are the clean months, and the cost is the rain.
What would we do?
Pick the month by what bothers you most. If it is rain, come in December to February. If it is heat, come in December or January and avoid March to May. If it is air, check the air page before you book October to March, and consider the coast for those months. Avoid September and October for a first long stay. The pattern that matches our numbers is a Bangkok base from November to January, then the south for the hot months. For the same weeks elsewhere in Thailand, January looks like this:
January averages, side by side
| Place | High | Low | Rain | Rain days |
|---|---|---|---|---|
| Bangkok | 31° | 22° | 19 mm | 1 |
| Chiang Mai | 27° | 16° | 8 mm | 2 |
| Hua Hin | 30° | 22° | 32 mm | 2 |
| Phuket | 30° | 25° | 73 mm | 4 |
Averages 2015-2025 · Source: Open-Meteo, CHIRPS · How we measure
For where to go in the same weeks, see where is warm in December and the Thailand three coasts guide, and for the coast by coast in December, Thailand in December. This is a weather view only: it does not cover flights, the cost of living or internet quality, so check those before booking.
How sure are these numbers?
They are month-of-year averages for a single point in central Bangkok, from stored climate data (Open-Meteo archive and CHIRPS rain totals, 2015 to 2025), so any one year can be wetter or hotter. Humidity comes from the same archive. A rainy day is a day with at least four millimetres of rain, which matches what rain gauges count. Air quality is modelled separately and is not in these numbers.
Frequently asked questions
What is the best month to visit Bangkok?
December and January. Highs are 31°C, rain is 9 mm in December and 19 mm in January, and humidity is the lowest of the year at about 65 percent. November and February are close behind.
Is Bangkok cool in December and January?
Not cool, only less hot. Highs are 31°C and nights 22°C, which feels mild next to April, but you will not need more than a thin layer in an air-conditioned room.
What is the hottest month in Bangkok?
April, with an average high of 34°C and nights of 27°C. March is close at 34°C, with nights of 26°C.
When is the rainy season in Bangkok?
May to October. September and October are the wettest at about 315 mm each, with rain on about 20 days in September. Rain usually comes as heavy showers, not all-day drizzle.
How humid is Bangkok?
Humidity runs from about 65 percent in December and January to 83 percent in September. It is below 75 percent from November to April.
Not sure where yet? Pick your months and what to avoid, and get your 3 best places → Where should I go?
Weather data: Open-Meteo (CC BY 4.0), open-meteo.com; rain totals: CHIRPS (Climate Hazards Center, UC Santa Barbara). Processed by NomadWeather from stored copies of the data.