# How Water Temperature Affects Your Matcha

**By Slow Social Club** · 2026-04-09

# How Water Temperature Affects Your Matcha

Of all the variables that affect the quality of a cup of matcha, water temperature is the easiest to control and the most frequently neglected. Pouring boiling water directly onto ceremonial grade matcha does the same thing as applying heat to any delicate ingredient: it destroys some of what makes it worth using in the first place.

## What Happens When the Water is Too Hot

Matcha's characteristic sweetness and umami depth come primarily from L-theanine, an amino acid that is abundant in shade-grown ceremonial grade leaves. L-theanine is heat-sensitive. At temperatures above approximately 80°C, it begins to degrade, and the cup loses the smooth, complex character that distinguishes ceremonial matcha from lesser quality alternatives.

At the same time, higher temperatures accelerate the extraction of catechins, the polyphenols that give matcha its astringency. The result of water that is too hot is a cup that is simultaneously bitter, astringent, and flat, lacking the sweetness that first-harvest ceremonial matcha should deliver.

## The Ideal Range

For ceremonial matcha prepared as usucha, thin matcha, the standard preparation, the ideal water temperature is between 70 and 80°C. At this range, L-theanine remains largely intact, catechin extraction is moderate, and the flavour profile of the matcha is preserved.

For koicha, thick matcha, where the ratio of matcha to water is much higher and the texture becomes paste-like, slightly cooler water, around 70°C, is generally preferred.

## How to Reach the Right Temperature Without a Thermometer

The most practical method requires no equipment. Bring water to a full boil, then pour it into your chawan or a separate vessel and allow it to rest for two to three minutes. This brings the temperature down to approximately 75 to 80°C, which is close enough to ideal for most purposes.

A yuzamashi, the small cooling bowl used in traditional matcha preparation, serves this function specifically. Pouring boiling water into the yuzamashi and letting it rest before adding it to your matcha is the most reliable low-effort method.

If you prefer precision, an electric kettle with temperature control set to 75 or 80°C eliminates the guesswork entirely.

## One Thing Worth Knowing

If your matcha tastes bitter even when you have controlled for temperature, it is worth checking the ratio before assuming the matcha is at fault. Two grams of matcha in 70ml of water at 75°C will taste very different from the same matcha in 150ml. The right water temperature matters, but it works together with the right amount of water.

**Tags:** brewing, matcha, preparation, temperature, tips

---

> Source: [Slow Social Club](https://slowsocialclub.com/blogs/journal/water-temperature-matcha)