Bangkok is hot every month — rain and humidity, not temperature, make its seasons

Asked:

“Bangkok Weather and other meterological stuff over the year and how theyre chaing”

Twelve months of Bangkok climate normals (ERA5/ERA5-Land, 1991–2020): temperature, rainfall, wet days, humidity, cloud and wind — followed by observed warming trends over five decades and end-century projections. Mean temperature spans only 26.0–30.1 °C, while monthly rain spans 9–241 mm across roughly 1,176 mm a year.

The annual cycle: heat peaks in April, rain and humidity in September

Average high °CMean °CAverage low °CRainfall mm (bars)Relative humidity % (band)

Wet days, cloud and wind

Wet days per month

Days with rain · monthlyclimate.com

Cloud cover %

Mean cloud cover · monthlyclimate.com

Wind km/h

Mean wind speed · monthlyclimate.com

How Bangkok’s climate is changing

Findings

April is the heat peak — 34.6 °C average high, 30.1 °C mean — while December is coolest at a still-warm 26.0 °C mean. monthlyclimate.com

September brings 241 mm of rain over about 26 wet days at 82% humidity; December has just 9 mm and 2 wet days — the ICAO climatological table independently confirms the same wet-season shape. icao.int

Nights are warming fastest: 1980–2012 saw annual mean minimums rise +1.97 °C against +0.95 °C for maximums, with mean air temperature up about +0.32 °C per decade over 50 years across the Bangkok Metropolitan Administration. openknowledge.worldbank.org

Dense central districts already run up to 2.8 °C hotter than the surrounding countryside, and a moderate-emissions path adds about 153 days per year above 35 °C by 2100, versus 60–100 such days in 1960–2000. worldbank.org

Month by month, 1991–2020 normals

Month	High °C	Low °C	Mean °C	Rain mm	Wet days	Cloud %	Humidity %	Wind km/h	Source

Monthly climatology: ERA5/ERA5-Land 1991–2020 climate normals for Bangkok (12 monthly rows) — averages, not a forecast; ICAO’s station climatological table used as an independent check (its September rainfall, 344 mm, reflects a different station/period). Climate-change section: 10 findings from World Bank (BMA air-temperature trends and projections, urban heat island), StatsClimat 1970–2024 station/reanalysis trends (a separate estimate from the World Bank BMA figure), and a peer-reviewed MDPI study of land-surface temperature 2003–2023 (surface, not air temperature). One duplicate trend row removed. Research performed 2026-09-01.

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