Weather in Bangkok in April

How April compares

April is the 1st warmest month of the year in Bangkok and ranks 2nd of 134 destinations we compare for April - see where else is hot in April. Within Thailand it is 2nd of 6 (Thailand in April). Against London's average high of 13.5°C in April, Bangkok is 21.1°C warmer by day and 21.6°C warmer at night.

Daytime and night-time in April

The typical April day in Bangkok peaks at 34.6°C, but that is an average: the warmest 10% of days reach 37.2°C or more. About 100% of days top 25°C and almost every pass 30°C. Nights average 26.7°C; one night in ten drops to 24.9°C or lower, so pack a layer for evenings. Between 1991 and 2020 the hottest April day here reached 38.7°C (2019-04-20) and the coldest night 20.9°C (2018-04-09).

Rain in April

Wet (more than 8 rainy days): about 11 days with 1 mm or more, 71 mm in total. Year to year it varies a lot - the wettest April was 2018 with 232 mm, the driest 1992 with 3 mm. Humidity averages 70%.

Sea temperature in April

The sea averages 30.1°C - warm enough to swim (22°c+). Depending on the year it ranges from 29.5°C to 30.6°C. For the warmest sea here, come in May (30.6°C).

Sunshine and daylight

Around 5.5 hours of sunshine a day (estimated from cloud cover), 12.3 hours of daylight: the sun rises about 06:05 and sets about 18:31 local time in mid-April. Average cloud cover is 55%.

Is April a good time to visit Bangkok?

April is not the strongest month here: hot days and frequent rain with intense heat. The best months for Bangkok on our scoring are December, January, November; months averaging 25°C or more: Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec.

Plan your days around the heat

The main catch is sustained heat, rather than just an occasional hot afternoon. With 98% of days reaching 30°C and humidity averaging 70%, even an ordinary day can feel demanding if you are arriving from a UK spring. The hottest days reach 37.2°C or more, making a packed outdoor schedule a poor fit. Aim to do your walking earlier, leave room for air-conditioned breaks around midday, and carry drinking water. Loose, lightweight clothing and sun protection should be everyday essentials. Evenings offer some relief from daytime highs, but they remain warm rather than cool, so do not expect the temperature to reset after sunset.

Allow for rain without writing off the day

April is wet enough that rain needs a place in your plans, but that does not mean you should expect uninterrupted grey weather. There are about 11 rainy days, alongside around 5.5 hours of sunshine a day. Against 12.3 hours of daylight, that leaves plenty of time when the sun is not shining directly, but cloud should not be mistaken for cool conditions. Pack a compact umbrella or lightweight rain protection that will not feel oppressive in the heat. Keep outdoor plans flexible and have an indoor alternative ready. This month works better for travellers happy to change pace than for those needing reliably dry weather.