In Aeropress brewing, the best water temperature varies with the coffee roast. Light roasts excel with hotter water, around 205°F to 208°F, to extract their complex flavors, while darker roasts prefer cooler temperatures, about 195°F to 200°F, to avoid bitterness and highlight richness. However, experimentation is encouraged. Adjusting temperature and extraction time can uniquely alter the flavor profile, making the Aeropress a versatile tool for personalized brewing.