This study evaluates updraft gasification of Tamarindus indica (tamarind) peel – an abundant agricultural waste in East Nusa Tenggara, Indonesia – under varying air flow rates. A fixed-bed updraft gasifier (3.2 kg capacity) was operated in batch mode with tamarind peel particles (1–2 cm). Four airflow rates (268, 304, 340, and 389 L/min) were tested. Reactor temperature profiles, syngas ignition delay, syngas flame duration, and stove (burner) flame temperature were measured; syngas was sampled and analyzed for methane content by gas chromatography. Increasing the air flow rate led to significantly higher reactor and flame temperatures and shorter syngas ignition times and burn durations. The maximum flow (389 L/min) yielded ~801 °C in the reactor and ~1256 °C at the stove burner. Gas analysis indicated the produced syngas was almost purely methane (~99% CH₄) in the sampled fraction (reflecting the measurement’s focus on CH₄). Under these conditions, the cold-gas (energy) efficiency was ~27.7%, with a total syngas energy output of about 1.4 MJ per batch. These results demonstrate that tamarind peel is a viable biomass feedstock for small-scale updraft gasifiers, contributing to renewable energy production and effective waste management in dryland agricultural regions.