What is the best coffee brew temperature? Hot water, explained

What temperature should coffee be brewed at?

For hot filter coffee, roughly 90 to 96°C (194 to 205°F). The SCA's 2021 home brewer standard requires the slurry, the mix of water and grounds, to reach that range early. It must then stay there.

Honest Coffee Guide gives a wider range of 85 to 95°C (185 to 203°F). It also lists method targets, such as 91°C for a V60 and 94°C for a Chemex. Those are starting points, not rules.

The two French press figures show that sources differ. Treat any single number as a place to start.

Should light and dark roasts use different temperatures?

Yes, most guides agree: hotter for light roasts, cooler for dark. Honest Coffee Guide suggests 90 to 96°C for light, 87 to 95°C for medium and 82 to 93°C for dark roasts.

Barista Marlous Van Putten, quoted by Perfect Daily Grind, gives the same rule. She adds that dark roasts "probably won't taste good" with very hot water, while light roasts can still taste good cooler. Counter Culture also suggests cooler water for dark roasts and very bright coffees.

Does the kettle temperature equal the brew temperature?

No, the water cools once it hits the grounds and brewer. Honest Coffee Guide says the temperature on a kettle or espresso machine "will not be the temperature of your coffee water mixture."

It estimates the drop at 10 to 15°C (18 to 27°F), even with preheating. That is why the SCA standard measures the slurry itself, not the water in the tank.

How does brew temperature relate to grind size?

Both change how fast coffee extracts, so they can partly stand in for each other. Hotter water speeds extraction. Perfect Daily Grind's French press guide notes that fine grounds also extract too quickly.

Perfect Daily Grind reflects this in its roast advice. Van Putten grinds finer for light roasts and coarser for dark roasts, the same direction as her temperature changes. If your kettle is already near boiling and a light roast still tastes thin, grinding finer is the next lever. See extraction for what sour and bitter tell you.

That is where the grinder matters. Being able to make small, repeatable grind changes lets you fine-tune after temperature. Find a starting point in pour-over grind settings, or translate a recipe with the grind converter.

Can you brew coffee with cold water?

Yes, but it takes hours instead of minutes. Wikipedia says cold brew soaks coarse grounds for 12 to 24 hours. Because the grounds never touch heated water, the chemical profile differs.

Stumptown, which sells cold brew, recommends a 16-hour steep, with 14 to 18 hours working well. The lower the temperature, the more time you trade for the same extraction. See cold brew for more.