Matcha Water Temperature: 70 °C, and Why 90 °C Ruins It

Matcha is not steeped, and that changes everything

Every other tea on this site is an infusion: hot water passes through leaf, takes what it can, and the leaf is discarded. Whatever the water leaves behind never reaches you. Matcha has no such filter. It is tencha — shade-grown leaf, de-stemmed and de-veined — stone-ground to a powder a few microns across, and whisked into suspension. You drink all of it.

That single fact explains the temperature. In a normal green tea, 90 °C water extracts more catechin from the leaf. In matcha, the catechin is already in the bowl; the water's only job is to disperse it and to control how it tastes on the way down. Heat makes bitterness more perceptible and drives off the aromatics almost immediately, and there is no upside to trade against, because there is nothing left in the leaf to extract harder.

Seventy degrees is the number. Not "just off the boil", not "a minute after boiling" — genuinely 70 °C, which in a cold bowl in a normal kitchen means boiling water left standing for four to five minutes, or half boiling water and half cold.

The method, in order

1. Sift 2 g through a fine mesh directly into a warmed bowl. Skip this and you will get lumps; there is no whisking your way out of them.
2. Add 70 ml of 70 °C water. Pour down the side of the bowl rather than straight onto the powder.
3. Whisk in a brisk W or M motion from the wrist, not the shoulder, for 15–20 seconds. You are aerating, not stirring: the bamboo tines should skim just off the bottom.
4. Finish with a slow circle and lift the whisk from the centre to break the largest bubbles.
5. Drink it now. Matcha separates within a couple of minutes — it is a suspension, and gravity always wins.

A chasen — the split-bamboo whisk — is cut from a single piece into 80 to 120 tines and is genuinely better than a metal whisk or a milk frother, which drive too much air in and give you foam instead of texture. Soak it in warm water for a minute before first use so the tines soften and do not snap.

Iced matcha, properly

Cold water will not disperse matcha powder. It clumps, floats and sinks in the same motion. The fix is a two-stage build:

1. Sift 2 g into the bowl.
2. Whisk with 30 ml of 70 °C water into a smooth, glossy paste.
3. Pour that over ice and top with 120 ml of cold water — or 150 ml of cold milk for a latte.

The same trick applies hot: paste first, then milk. Whisking matcha directly into milk fails because milk proteins and fat interfere with the suspension long before the powder has broken up.

Grades, honestly

• Ceremonial grade — first-harvest leaf, stone-milled, bright jade, sweet enough to drink as usucha with nothing added. Use it at 70 °C and do not put it in a latte.
• Culinary or latte grade — later harvests, more astringent, duller green. It is the right choice for milk drinks and baking, where its bitterness is a feature against sugar.

Colour is the fastest test you have. Bright, almost fluorescent green means fresh, well-shaded, well-milled leaf. Yellow-olive means old, sun-grown, or both. Matcha oxidises quickly once opened — see how to store tea — and a tin left on a sunny shelf for two months will be visibly duller than the day you bought it.

Troubleshooting

• Bitter and sharp: water above 80 °C. This accounts for most bad matcha.
• Lumpy: unsifted powder.
• No foam: too little powder, too much water, or a whisk moved from the elbow. Wrist only.
• Separates in the bowl: normal after two minutes. Drink it faster.
• Dull, hay-like, brownish: the tin is old or the grade is culinary. Neither is fixable by technique.