Best Time to Visit Bangkok: Weather, Floods and Festivals

When is the best time to visit Bangkok?

The best time to visit Bangkok is November to February, when rain is rare and nights are a little cooler: December averages 11.6 mm of rain and a high of 32.3°C. March to May is hot, peaking in April at 35.7°C. May to October is the rainy season, wettest in September, with a risk of floods.

Bangkok is hot in every month; what changes is rain. The Thai Meteorological Department’s 1991–2020 normals for its Bangkok Metropolis station (48455), 3 metres above sea level, give an annual total of 1,702.2 mm over 128.3 rainy days, but only 11.6 mm in December against 335.9 mm in September (TMD).

The dry months have a catch the rain figures hide: haze. The same table counts 21 days with haze in an average January, against 1.5 in August, and the FCDO says Bangkok is affected by seasonal regional smoke haze. Floods are the rainy season’s catch, as late September 2026 showed. Both are covered below; everything was checked on 17 October 2026.

Once you have a month, choose a base with where to stay in Bangkok and pace the trip with the Bangkok 3-day itinerary or the 7-day plan.

What is Bangkok’s weather like month by month?

Bangkok’s average highs run from 32.3°C in December to 35.7°C in April, and lows never fall below 23°C. December to February is driest, each under 25 mm of rain and three rainy days. Rain builds from May and peaks in September at 335.9 mm over about 21 days, with October close behind.

The table uses TMD’s official 30-year averages for 1991–2020 at Bangkok Metropolis, published in its Climatological Data of Thailand report. Temperatures are monthly means of the daily maximum and minimum, a rainy day is one with at least 0.1 mm of rain, and sunshine is the monthly total of bright-sunshine hours. These are long-term averages, not forecasts.

Humidity follows the rain: the mean relative humidity is 79% in September against 66% in December in the same record. The verdict column is our reading of the numbers for a typical city trip, not an official rating.

Is November to February really the best time to visit Bangkok?

Yes, for most trips. These four months average under 45 mm of rain each and no more than five rainy days, and January nights average 23.4°C. The catches are demand, with Christmas, New Year and Chinese New Year all in the window, and haze, which the long-term record shows is worst from December to February.

TMD’s outlook for January to March 2026 described January as the month when most of Thailand meets its lowest temperatures, with cool weather in the central and eastern regions, and February as the transition to summer, which starts from the middle of the month (TMD outlook). In Bangkok that means warm days and slightly fresher mornings, not cold.

Haze is the trade-off. TMD’s normals count an average of 21 haze days in January, 16.9 in February and 15.8 in December (TMD), and the FCDO warns that pollution in Thai cities sometimes reaches dangerous levels and can worsen asthma and other conditions. Check the Pollution Control Department’s live readings on Air4Thai the week before you fly.

Demand is the other cost. Christmas and New Year fill hotels, the Bank of Thailand lists 31 December 2026 and 1 January 2027 as holidays (Bank of Thailand), and the Hong Kong Observatory puts Chinese New Year on 6 February 2027 (HKO). Book refundable rooms early for those weeks.

What is Bangkok like from March to May?

Hot. April is the hottest month, with an average daily high of 35.7°C and lows above 27°C, and the station has recorded 40.1°C. March is the sunniest month of the year. Songkran, on 13–15 April in 2027, is the season’s big event, turning streets such as Silom Road into water-fight zones.

TMD’s normals put the mean maximum at 34.7°C in March, 35.7°C in April and 35.1°C in May, with the record high of 40.1°C set in March (TMD). Its February–April outlook called April the most sweltering month of the year in upper Thailand and warned that summer thunderstorms add rain and strong gusts (TMD outlook).

Songkran is the reason to brave it. The Bank of Thailand lists the 2027 Songkran holidays as 13–15 April (Bank of Thailand). In 2026, TAT said large-scale Bangkok events ran from 9 to 15 April, with water zones on Silom Road on 12–14 April and at Siam Square on 12–15 April (TAT). Expect to be soaked anywhere near them, and expect heavy travel demand across Thailand that week.

Outside Songkran, the hot season suits travellers who can live on an early-and-late rhythm: temples at opening time, malls and museums at midday, rooftops and markets after dark.

Is Bangkok worth visiting in the rainy season?

Yes, if you plan around storms. Rain sets in during the second half of May and builds to a September peak of 335.9 mm over about 21 rainy days, with thunder on around 11 of them. Indoor sights carry the day when it pours. September and October bring the highest flood risk, so keep bookings flexible.

TMD’s April–June outlook describes the second half of May as the start of the rainy season and notes that June can bring a dry spell of one to two weeks (TMD outlook); its September–November outlook says most areas get their heaviest monthly rain of the year in September, and that October is the transition to the cool season (TMD outlook). The normals count 10.6 thunderstorm days in an average September (TMD).

The FCDO says the rainy season generally runs from May to October but that the weather has become less predictable, and that heavy rain can cause flash flooding and transport disruption. Keep a light rain jacket, quick-drying shoes and an indoor alternative for every afternoon; our Bangkok in the rain guide lists them.

How serious is flooding in Bangkok, and what happened in 2026?

Serious enough to plan for in September and October. In late September 2026, the FCDO said severe flooding hit Bangkok and neighbouring provinces and all 50 Bangkok districts were declared disaster-affected areas. TAT reported both airports open throughout and the rail lines running again by 29 September. Build flexibility into late-season trips.

The FCDO says the flooding followed heavy rain in Bangkok, Nonthaburi, Pathum Thani and Samut Prakan, that road closures and flooding of low-lying areas are possible, and that the government declared special public holidays there on 28 and 29 September, when many offices were closed. It advises following the advice of local authorities.

TAT’s rolling advisory, updated from 26 to 29 September, reported the Red Line resuming on 27 September, Suvarnabhumi and Don Mueang open throughout, and by 29 September the BTS, MRT, Airport Rail Link and Red Line all operating, with the Grand Palace, Wat Pho and Wat Arun accessible (TAT). It also noted Thai Airways cancellations and a baggage backlog at Suvarnabhumi on 29 September.

If you travel in September or October, book refundable rooms near a BTS or MRT station, keep a day of slack before onward flights, and check that your travel insurance covers weather disruption.

Which festivals and holidays affect a Bangkok trip in 2026–27?

The dates to plan around are Loy Krathong in November, the year-end holidays, Chinese New Year on 6 February 2027, Makha Bucha on 21 February, Songkran on 13–15 April and Visakha Bucha on 20 May. Royal ceremonies can also change Grand Palace opening, so check its calendar before you go.

Holiday dates come from the Bank of Thailand’s 2026–27 holiday calendar for financial institutions (Bank of Thailand), and Chinese New Year from the Hong Kong Observatory. TAT describes Loy Krathong as falling on the full moon of the 12th lunar month (TAT); when we checked, the official 2026 Bangkok date and programme had not been published, so none is given.

The Grand Palace’s calendar notes that dates can be changed or added (Grand Palace); its standard hours are 8.30am to 4.30pm daily, with tickets on sale until 3.30pm (Grand Palace). The FCDO adds that alcohol sales are restricted between midnight and 11am outside licensed venues.

Which month suits which kind of Bangkok trip?

Temple walking and river days suit November to February. Food, shopping and museums work in any month. Festival seekers should aim for Songkran in April or Loy Krathong in November. Travellers sensitive to haze should favour June to October, and anyone who needs dry days should avoid September and October.

These windows combine TMD’s normals (TMD) with the FCDO’s haze and flood warnings and the holiday calendar above. Nothing in the record makes any month unsafe on its own; the questions are heat, rain, air quality and how much of your plan is outdoors.

If Bangkok is the start of a longer Thailand trip, check the north and the islands too: Chiang Mai’s smoke season and the Gulf’s rains run on different calendars. Our best day trips from Bangkok guide covers easy escapes from the city in any season.

How far ahead should you book a Bangkok trip?

For Christmas, New Year, Chinese New Year and Songkran, book flights and a refundable room as soon as your dates are fixed. Other months need less notice, but September and October deserve flexible bookings because of flood risk. Complete Thailand’s digital arrival card within the three days before you arrive.

The FCDO says visa-exempt visitors entering from 15 September 2026 can stay up to 30 days for tourism only, that all foreign nationals must complete the digital arrival card before arrival, and that you may be asked for proof of funds and onward travel. Our Thailand visa exemption rules and TDAC guide explain both.

Price the same room on two sites before paying, and compare fares a week either side of festival dates. For an April trip, check whether your dates overlap the Songkran holidays before you book anything non-refundable.

What is the verdict on the best time to visit Bangkok?

Go from November to February if you can, ideally in late November or early February to dodge the year-end peak, and check haze readings before you fly. March and April suit heat-tolerant travellers and Songkran fans. Avoid September and October unless your plans are flexible enough to absorb storms and floods.

The numbers behind that verdict: 11.6–44.6 mm of rain a month from November to February against 335.9 mm in September, highs of 32.3–35.7°C all year, and the year’s haziest days from December to February (TMD). Festivals and holidays sit on top of that climate and mostly add demand.

Next, choose a neighbourhood in where to stay in Bangkok, read things to do in Bangkok for honest skips, and use the Bangkok destination guide for budgets. Our Bangkok hotels page lists properties with dated guest-score data.