If your matcha is bitter and you change one thing, change the water temperature. It costs nothing, takes ninety seconds, and fixes more bad bowls than buying a better tin does. The number to aim for is around 75 °C, and the reason is a straightforward matter of what dissolves at what speed.
The short answer
Use water at 70 to 80 °C, with 75 °C as the default. In practice: boil the kettle, take the lid off, and wait about 90 seconds. Above 80 °C you extract catechins faster than amino acids and the bowl turns bitter; below 70 °C the powder struggles to suspend and the foam never forms properly.
Why hot water makes matcha bitter
Matcha's flavour is a balance between two compound groups. Amino acids — chiefly L-theanine — taste sweet and savoury. Catechins taste bitter and astringent. Both dissolve into water, but not at the same rate: catechin extraction accelerates sharply with temperature while amino acid extraction is comparatively flat.
So the same powder gives you a different drink depending on the water. At 75 °C you get a balanced ratio and the sweetness comes through. At 95 °C you get a catechin-forward extraction and the bitterness dominates before the sweetness has a chance to register. Nothing has gone wrong with the matcha; you simply pulled the harsh compounds out preferentially.
Temperature by drink
- Usucha (everyday thin tea) — 70–80 °C, ideally 75. The default for a plain bowl.
- Koicha (thick tea) — 75–80 °C. Slightly warmer helps the much higher powder load dissolve, and koicha grades are sweet enough to tolerate it.
- Hot matcha latte — 75–80 °C for the concentrate. The milk arrives cooler and drops the final temperature anyway, so there's no need to compensate by overheating the water.
- Iced matcha — whisk the concentrate at 75 °C, then pour over ice. Whisking directly into cold water works too but takes longer and foams less.
- Cold brew matcha — cold or room-temperature water, shaken in a bottle, left 30+ minutes. Very low bitterness because catechin extraction is minimal, but no foam and a thinner body.
- Culinary grade in a sweetened drink — temperature matters less, since sugar and milk mask the bitterness you're extracting.
Hitting it without a thermometer
Boil the kettle, take the lid off, and count to ninety. In a normal kitchen that lands water somewhere around 75 to 80 °C, which is close enough. Two variations worth knowing: pouring the boiled water into a cold cup and then into the bowl drops it faster, roughly 5 to 10 °C per transfer, which is the traditional Japanese approach; and a variable-temperature kettle removes the guesswork entirely if you make matcha daily.
Do not use water straight off the boil under any circumstances. It is the single most common reason people conclude they dislike matcha.
What happens if the water is too cool
Under about 70 °C the powder resists suspending, you get streaks and clumps that no amount of whisking clears, and the foam is sparse and collapses quickly. The drink also goes lukewarm within a minute, which is unpleasant. Too cool is a less common mistake than too hot, and it is more obviously wrong when it happens.
Frequently asked
What temperature should water be for matcha?
70 to 80 °C, with 75 °C the reliable default. Without a thermometer: boil the kettle and wait about 90 seconds with the lid off. Water straight off the boil extracts catechins too aggressively and makes the bowl bitter.
Can you make matcha with boiling water?
You can, and it will taste noticeably worse. Boiling water pulls out bitter catechins far faster than the sweet amino acids, so the balance tips hard toward astringency. It can also scorch delicate high-grade powder. Waiting ninety seconds costs nothing and changes the drink completely.
Is 80 degrees too hot for matcha?
No, 80 °C sits at the top of the workable range and is fine, particularly for koicha or for a sweeter ceremonial grade that can carry it. Push past about 85 °C and bitterness becomes hard to avoid regardless of grade.
Does water temperature affect matcha's health benefits?
Marginally and in both directions. Hotter water extracts more catechins, which is where EGCG comes from — so bitterness and catechin content rise together. Since you consume the whole leaf with matcha rather than an infusion, most of what the powder contains ends up in you regardless. Choose the temperature for flavour.
How do I cool water quickly for matcha?
Pour it between two vessels. Each transfer drops the temperature roughly 5 to 10 °C, and the traditional Japanese approach uses a cooling bowl for exactly this reason. Adding a small splash of room-temperature water works too, though it dilutes the bowl slightly.