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The ideal water temperature for preparing coffee in a French press

Why Does Water Temperature Matter When Brewing Coffee?

If you've ever wondered why the same coffee can taste bright and sweet one day and flat or bitter the next, water temperature might be the reason.

Alongside grind size, brew ratio, and brewing time, water temperature is one of the most important variables in coffee preparation. Even a difference of just a few degrees can noticeably change the flavor in your cup.

But does hotter water always make better coffee? Not necessarily.

How Temperature Affects Extraction

When hot water comes into contact with ground coffee, it dissolves hundreds of different compounds that contribute to aroma, sweetness, acidity, body, and bitterness.

Higher temperatures increase the rate of extraction, allowing water to dissolve these compounds more quickly and efficiently. Lower temperatures slow the process down.

If the temperature is too low, the coffee may become under-extracted, resulting in a sour, weak, or flat cup. If the temperature is too high, excessive extraction of bitter compounds can occur, producing harsh, astringent, or burnt flavors.

The goal is to find the balance where sweetness, acidity, and body work together harmoniously.

The Myth of “Never Use Boiling Water”

Many coffee drinkers have heard the advice: “Never use boiling water for coffee.”

This recommendation originated from concerns that very hot water could over-extract coffee and produce unpleasant roasted or bitter flavors. The Specialty Coffee Association (SCA) recommends brewing temperatures between 90 °C and 96 °C, with 92–94 °C commonly used for cupping.

However, modern specialty coffees are often roasted lighter than traditional commercial coffees. These lighter roasts can benefit from higher brewing temperatures because they require more energy for proper extraction.

As a result, many professional baristas now use water close to boiling when brewing pour-over coffee.

Kettle Temperature vs Brew Temperature

One of the most common misconceptions is that the temperature displayed on the kettle is the same as the temperature experienced by the coffee.

In reality, as soon as hot water touches the coffee bed, several factors begin reducing its temperature:

• The coffee grounds absorb heat.

• The dripper and filter absorb heat.

• Heat escapes into the surrounding air.

• Fresh water is added gradually throughout the brew.

This means the actual brew temperature is significantly lower than the kettle temperature.

Measurements conducted by barista Colin Runnion showed that when brewing a pour-over with water at 96 °C, the slurry temperature never exceeded 90 °C and spent much of the brew below that level.

For this reason, using water at 96–99 °C for a V60 or similar pour-over brewer often makes perfect sense.

Why Immersion Brewing Behaves Differently

Immersion brewing methods such as the French press, cupping, or some AeroPress recipes retain heat much more effectively.

In an experiment conducted by World Barista Champion Gwilym Davies, one liter of water at 97 °C remained above 90 °C for nearly five minutes during immersion brewing.

This happens for two main reasons:

1. Larger Volumes Retain Heat Better

The larger the volume of liquid, the slower it cools.

A one-liter French press loses heat far more slowly than a small pour-over brew because it has a lower surface-area-to-volume ratio.

2. The Coffee Crust Acts as Insulation

During immersion brewing, a crust forms on the surface of the coffee. This layer helps retain heat inside the brew.

Once the crust is broken by stirring, the temperature begins to drop much more rapidly.

Neither of these conditions exists in pour-over brewing, which explains why immersion methods generally maintain higher brew temperatures.

Recommended Water Temperatures

While there is no universal brewing temperature for every coffee, the following ranges provide a useful starting point:

These recommendations may vary depending on roast level, coffee density, grinder performance, brew volume, and personal taste preferences.

Why We Often Use Lower Temperatures for French Press

At first glance, it seems logical that a French press should require hotter water because the brewing time is longer.

However, because immersion brewing retains heat so effectively, the coffee remains at an elevated temperature throughout most of the extraction process.

For this reason, using water around 92–95 °C often produces a sweeter and more balanced cup than using freshly boiled water.

This effect becomes even more noticeable when brewing larger volumes.

Finding the Right Temperature for Your Coffee

There is no single perfect temperature that works for every coffee and every brewing method.

A washed Kenyan coffee may shine at a higher temperature, while a naturally processed Brazilian coffee may taste better a few degrees cooler.

As a starting point:

• If your coffee tastes sour or weak, increase the temperature slightly.

• If it tastes harsh, bitter, or overly drying, lower the temperature by a few degrees.

• Change only one variable at a time and evaluate the results.

Ultimately, your palate is the most reliable brewing tool you have.

Final Thoughts

Water temperature is one of the most powerful tools for controlling coffee extraction.

For pour-over brewing, using water close to boiling often helps achieve a more complete extraction because the brew loses heat rapidly throughout the process.

For immersion methods such as the French press, slightly lower temperatures can produce better balance because the coffee retains heat much more effectively.

Understanding this difference will help you brew sweeter, cleaner, and more consistent coffee—regardless of your preferred brewing method.