Does Water Temperature Affect Coffee Taste? Yes — Here's How

By Coffee Ratio Calculator Guru · Updated January 2025 · 5 min read

Water temperature has a direct and significant effect on coffee flavour. Use our water temperature guide to find the right temperature for your method. Even a 5°C difference can shift a coffee from bright and acidic to smooth and chocolatey.

How Temperature Changes Flavour

Different flavour compounds in coffee dissolve at different rates and temperatures. Light, volatile aromatic compounds — responsible for floral, fruity, and citrus notes — dissolve quickly and at lower temperatures. Heavier compounds like sugars, caramelisation products, and lipids require higher temperatures and longer contact to fully dissolve. Bitter compounds (primarily chlorogenic acid degradation products) extract most aggressively at very high temperatures and over-extended extraction times.

Brewing at 93°C pulls out a balanced mix of all these compound types. Brewing at 88°C favours sweeter, less acidic compounds — useful for taming overly bright light roasts. Brewing at 98°C pulls out everything more aggressively, including bitter compounds — which is why boiling water is not recommended for delicate coffees.

Practical Experiments to Try

If you have a temperature-controlled kettle, try brewing the same coffee with the same ratio and grind at three different temperatures: 88°C, 93°C, and 96°C. The differences are genuinely striking — the 88°C brew will taste sweeter, rounder, and less acidic; the 96°C brew will taste brighter, more aromatic, and slightly sharper. Most people find 93°C is the sweet spot for medium roasts; light roasts benefit from 94–96°C; dark roasts are often better at 90–93°C.