Why temperature matters
Matcha contains three families of compounds that make its taste, and they react differently to heat:
- L-teanina (umami, sweetness): partly degrades above 80 °C. At 95 °C the loss over 5 minutes can exceed 30%.
- Catechins (bitterness, astringency): more soluble the hotter the water. At 95 °C extraction is 3 to 4 times what it is at 65 °C.
- Chlorophyll (green colour): stable across the normal temperature range.
The balance between umami and bitterness depends directly on temperature. At 70 °C umami is at its peak and bitterness stays in check. At 95 °C it reverses: bitterness takes over.
Recommended temperatures
| Preparation | Temperature | Why |
|---|---|---|
| Koicha (first-harvest Uji) | 80 to 85 °C | A higher concentration needs more heat to dissolve |
| Usucha (first-harvest Uji or Yame) | 65 to 72 °C | Preserves the premium cultivar umami |
| Usucha (Kagoshima or Nishio) | 72 to 78 °C | A more robust profile takes hotter water |
| Matcha latte (the water part) | 80 °C | The matcha has to compete with the milk, so it needs more extraction |
How to measure without a thermometer
The pouring method: every time you pour hot water from one container into another, the temperature drops by about 10 °C. From boiling (95 to 100 °C): one pour = 85 °C, two = 75 °C, three = 65 °C. Less precise than a thermometer, but good enough most of the time.
That said, the pouring method has a margin of several degrees and depends on the vessel, the quantity and the temperature of the kitchen. If you make matcha daily, a probe thermometer costs less than two tins of bad matcha. The DOQAUS instant read probe thermometer (see the price on Amazon) states a 3 second reading and a 304 stainless steel probe, which is the only thing that matters here: the ones that take fifteen seconds to settle are no longer measuring the water you are about to use. It reaches 300 °C, far beyond anything you need.
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