Climate and monthly weather forecast
Bangkok, Thailand

Bangkok has a tropical savanna type of climate (Köppen climate classification Aw) with hot and humid summers, wet rainy periods, and warm winters.
Bangkok, the capital of Thailand, lies in central Thailand, in the Chao Phraya River delta. The city lies in the proximity of the Gulf of Thailand, which influences its climate. Bangkok is at a low altitude, only about 1.5 meters above sea level, and lies in the tropical latitudes, which keep the temperatures warm throughout the year.

Bangkok, the Venice of the East, has numerous canals that serve as transport routes and drainage channels. The topography is flat in the absence of mountains, and most of the lands are swamplands converted to agriculture lands. Annual rainfall is 1651mm (65") - precipitation occurs mainly in the wet season from May to October, while the rest of the year hardly sees 15% of the total rainfall. Bangkok registers 2623 hours of sunshine during the year. The average humidity ranges from 66% to 79%, and the city is warm throughout the year.

Bangkok has three seasons: hot, wet, and cold. The tropical location is responsible for reasonably hot temperatures all year round. The hot season is from February to April, is mostly dry, with average the high temperatures of 35.6°C (96.1°F) at the peak of April. Scorching days register in April and May before the arrival of the monsoon, with temperatures often crossing 37.8°C (100°F). Bangkok exhibits the urban heat island effect, albeit to a lower extent than other parts of Thailand owing to its proximity to the sea.
The southwest monsoon ascends over Bangkok during the wet season from May to October, bringing heavy rainfall along with it. Heavy rain and stormy weather are evident in the season as it rains almost every day or two. The cold season is from November to January when Bangkok has pleasant weather, and the average low temperature is 21.7°C (71.1°F) during December.

The best time to visit Bangkok is from November to January when the temperatures are relatively mild during the winter, and the rainfall is negligible.
The average humidity is at the lowest levels of the year during the winter. The dry months, clear skies, and lack of stormy weather make the season pleasant and stay comfortable.
Winter months seldom go below 15.6°C (60.1°F) to 21.1°C (70°F), and the days are bright with ample sunshine.

April to October is usually the worst time to visit Bangkok as the temperatures are high, and the precipitation is heavy.
The wet season punishes the region by unleashing profound spells of rains. The conditions are humid and mostly cloudy. Floods are common, and Bangkok sometimes submerges into the water for long periods. Add tropical storms to the equation, and the wet season becomes the worst time to visit Bangkok.

Bangkok is prone to thunderstorms, tropical cyclones, typhoons, and floods, mainly during the rainy period from May to October. Thunderstorms are frequent in the region with lightning and rain. Tropical cyclones of variable strengths originating in the Indian Ocean travel to Bangkok, make landfills and cause devastation on occasions. Torrential rains during the wet season flood Bangkok regularly as the city is at a low elevation, drainage systems are insufficient, and subsistence is a severe issue.

The best months for a swim in Bangkok, Thailand, are January through March and December, with a perfect temperature - varying between 25°C (77°F) and 29°C (84.2°F), and scarce rainfall.

January, like December, is a hot winter month in Bangkok, Thailand, with an average temperature varying between 22.6°C (72.7°F) and 32.5°C (90.5°F). The ideal sea water temperature of 26.7°C (80.1°F) and only 1 rainfall days, with 13mm (0.51") of accumulated rainfall, makes January the best time for swimming and other water activities. Weather in January »

The last month of the winter, February, is also a hot month in Bangkok, Thailand, with an average temperature varying between 24.4°C (75.9°F) and 33.3°C (91.9°F). The ideal sea water temperature of 27.5°C (81.5°F) and only 3 rainfall days, with 20mm (0.79") of accumulated rainfall, makes February the best time for swimming and other water activities. Weather in February »

The first month of the spring, March, is also a hot month in Bangkok, Thailand, with an average temperature fluctuating between 34.3°C (93.7°F) and 25.9°C (78.6°F). An excellent water temperature of 28.3°C (82.9°F) and only 3 rainfall days, with 42mm (1.65") of accumulated rainfall, makes March a prime for swimming and other water activities. Weather in March »

April in Bangkok, Thailand, is a torrid spring month, with an average temperature varying between 35.4°C (95.7°F) and 26.9°C (80.4°F). With an average high-temperature of 35.4°C (95.7°F) and an average low-temperature of 26.9°C (80.4°F), April is the warmest month. The average heat index in April is estimated at a blazing hot 53°C (127.4°F). Weather in April »

The last month of the spring, May, is also a hot month in Bangkok, Thailand, with temperature in the range of an average high of 34.4°C (93.9°F) and an average low of 26.3°C (79.3°F). In Bangkok, the average high-temperature in May is relatively the same as in April - a tropical 34.4°C (93.9°F). Weather in May »

The first month of the summer, June, is still a tropical month in Bangkok, Thailand, with an average temperature fluctuating between 26.1°C (79°F) and 33.6°C (92.5°F). In Bangkok, the average high-temperature in June is relatively the same as in May - a still tropical 33.6°C (92.5°F). Weather in June »

July, the same as June, in Bangkok, Thailand, is another tropical summer month, with an average temperature ranging between min 25.7°C (78.3°F) and max 33.2°C (91.8°F). In Bangkok, the average high-temperature in July is relatively the same as in June - a still tropical 33.2°C (91.8°F). Weather in July »

The last month of the summer, August, is another tropical month in Bangkok, Thailand, with an average temperature varying between 32.9°C (91.2°F) and 25.5°C (77.9°F). In August, the average high-temperature is almost the same as in July - a still tropical 32.9°C (91.2°F). Weather in August »

September, the first month of the autumn in Bangkok, is also a hot month, with an average temperature varying between 25°C (77°F) and 32.8°C (91°F). In September, the average high-temperature is essentially the same as in August - a still hot 32.8°C (91°F). Weather in September »

October, like September, is a hot autumn month in Bangkok, Thailand, with an average temperature fluctuating between 32.6°C (90.7°F) and 24.8°C (76.6°F). In Bangkok, the average high-temperature in October is practically the same as in September - a still tropical 32.6°C (90.7°F). Weather in October »

November, the last month of the autumn in Bangkok, is another tropical month, with an average temperature varying between 32.4°C (90.3°F) and 23.9°C (75°F). In Bangkok, the average high-temperature in November is almost the same as in October - a still tropical 32.4°C (90.3°F). Weather in November »

December, the first month of the winter in Bangkok, is still a hot month, with an average temperature varying between 22°C (71.6°F) and 31.7°C (89.1°F). The perfect water temperature of 27.9°C (82.2°F) with 6mm (0.24") of accumulated rainfall and only 1 rainfall days, makes December a great period for swimming and other water activities. Weather in December »