With climate change happening on the planet, such as the rise in the average temperature of the earth, where the Amazon is notoriously one of the regions most susceptible to feeling impacts. Meteorological conditions, such as air temperature and humidity, play a crucial role in thermal discomfort. The thermal discomfort index (TDI) quantifies the levels of stress that a person experiences in the face of these adverse conditions. The objective of this work was to analyze the variability of temperature and relative humidity, calculate thermal discomfort indices in the municipality of Tucuruí (PA) and its projections for future scenarios. Based on observed temperature and humidity data (1980 to 2022), and future scenarios RCP 4.5 and RCP 8.5, the variability of climatological variables was analyzed. In the last stage, the IDT of the observed data and future scenarios was calculated. From the results, it was possible to observe that meteorological variables correlate, acting inversely, with significant drops in humidity rates over the years. It was found that the municipality of Tucuruí is constantly in the mild discomfort zone, and that meteorological variables greatly influence the IDT, especially during drought in the municipality. In RCP 8.5, despite starting in the comfort zone, from the middle of the century it will present discomfort levels ranging from mild discomfort to heating discomfort.
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