Bangkok has sweltered through 19 straight days of dangerous heat index levels, with extreme heat and humidity pushing conditions into a high-risk zone for public health.

The Bangkok Metropolitan Administration (BMA) said the heat index has stayed in the “danger” range of 42–51.9°C since April 1. The heat index reflects how hot it actually feels, factoring in humidity.

Officials warned residents to limit prolonged outdoor exposure and watch for symptoms such as fatigue, dizziness, rashes, muscle cramps and heatstroke, especially during peak afternoon hours. 

At the same time, the Meteorological Department has forecast summer storms through April 25, with Bangkok set to face thunderstorms and strong winds.

Storms are expected on Monday and again from April 23–25, bringing strong winds, hail and some heavy rain to upper Thailand, the Northeast and the East.

In Bangkok and surrounding areas, hot conditions will continue, with thunderstorms expected to affect 10–30% of the area. Temperatures could reach 39°C in the capital and up to 42°C in the North and Northeast.