Fix My Coffee
What temperature should pour-over water be?
92–96 °C. Do not pour straight off the boil: if you have no thermometer, waiting 30–45 seconds after the kettle stops is enough to land in that range.
Why that range
Temperature sets how fast coffee dissolves. Cool water leaves the cup under-extracted and sour. Boiling water pulls the bitter compounds out too. 92–96 °C is the window between those.
Preheat the dripper and the carafe
Cold ceramic pulls several degrees out of water you just measured correctly. Rinse both with hot water before you brew — the same move rinses the paper filter as well.
Shift it for the roast
Light roasts are harder to dissolve and open up better at the top of the range, 95–96 °C. Dark roasts give themselves up easily and stay more balanced at 90–92 °C.
Fix the temperature first
If the water is a different temperature every morning you will never find your grind setting, because one variable keeps moving underneath you. Hold the temperature steady and dial in with the grinder.
Fix My Coffee records water temperature as part of the brew, and saves the setting that worked as a recipe.