Home / Blog / Water temperature
Water Temperature Is the Most Underrated Variable in a Cup of Tea
Ask someone why their green tea tastes bitter and they'll usually blame the leaf. Most of the time it isn't the leaf: it's the water. Tea gets more written about its origin, its grade, its terroir than about the one variable that's completely within the drinker's control and does more damage than almost anything else when ignored: how hot the water actually is when it hits the leaf.
Why boiling water goes wrong
Boiling water (100°C / 212°F) is correct for exactly one category: black tea and most pu-erh. For anything less oxidised, it's too aggressive. Delicate teas, especially green and white, contain compounds that extract unevenly at high heat: catechins and tannins flood out fast and bitter, while the more fragile aromatic compounds that give green tea its grassy, sweet character get overwhelmed or destroyed. The result is the flat, bitter cup that gets blamed on the tea itself, when it's really an extraction problem.
A rough guide by style
- Green tea: 70–80°C (160–175°F). Delicate Japanese greens like gyokuro often want the lower end of that range, sometimes even cooler.
- White tea: 75–85°C (170–185°F). Slightly more forgiving than green, but still nowhere near boiling.
- Oolong: 85–95°C (185–205°F), with lighter, greener oolongs toward the lower end and darker, more roasted ones toward the higher end.
- Black tea: 95–100°C (205–212°F). This is the one style built for water straight off the boil.
- Pu-erh and dark tea: 100°C (212°F): the dense, fermented leaf needs the full heat to open up.
Getting it right without a thermometer
A thermometer is the precise way to do this, but it's not the only way. A few practical shortcuts:
- Let boiled water rest. Water dropped from a rolling boil into a room-temperature cup loses roughly 10°C in the first minute or so. Timing that rest (30 seconds, a minute, two minutes) gets surprisingly close to the ranges above with practice.
- Pour between vessels. Pouring boiled water once from the kettle into a second cup, then into the teapot, cools it a bit further: useful for green and white tea specifically.
- Use a variable-temperature kettle. Not essential, but if tea is a regular habit, a kettle with temperature presets removes the guesswork entirely and is one of the few genuinely useful gadgets in this space.
None of this is about ceremony for its own sake: it's the difference between a green tea that tastes sweet and vegetal and one that tastes like wet cardboard, using the exact same leaf. Temperature is free. It's worth getting right.