Water temperature for green, black and oolong tea

Tea gets less attention than coffee when it comes to brewing details, but one setting matters more than any other: the temperature of the water. Pour boiling water on a delicate green tea and it turns bitter and grassy in a minute. Pour cool water on a black tea and it tastes thin. Matching the water to the leaf is the easiest way to make better tea at home.

Why temperature changes the cup

Tea leaves hold compounds that taste sweet and savoury, and compounds that taste bitter and astringent. Hotter water extracts everything faster, but it pulls the bitter ones especially quickly. Teas that are processed lightly, such as most greens and whites, have more of the delicate flavours and are easily overwhelmed. Teas that are fully oxidised, such as black tea, stand up to boiling water and need it to open up.

Where to start

These are starting points, not rules. Adjust to taste and to the advice on the packet.

• Japanese green teas (sencha, gyokuro): 60–80 °C. Gyokuro at the lower end, everyday sencha around 70–80 °C. Short steeps, often one to two minutes.
• Chinese green teas (such as Dragon Well): 75–85 °C, two to three minutes.
• White teas: 75–90 °C, three to five minutes. They are forgiving, but boiling water can make them flat.
• Oolong teas: 85–95 °C. Lighter, greener oolongs at the lower end; darker, roasted ones near the top.
• Black teas: 90–100 °C, three to five minutes.
• Pu-erh: 95–100 °C, often with a quick rinse first.
• Herbal infusions (rooibos, mint, chamomile): 100 °C, five minutes or more. Not technically tea, and they like it hot.

Steeping time works with temperature

If a tea tastes bitter, lower the temperature or shorten the steep, not both at once. If it tastes weak, raise one of them. Many green teas and oolongs can be steeped several times; later steeps often want a little more time or slightly hotter water.

Leaf quantity matters too. A good start is about 2–3 g of leaf per 200 ml of water, more for large, open leaves and less for small, broken ones.

Getting the temperature right

With a variable-temperature kettle. Set it and pour. This is the most consistent way, and it is the reason we recommend one in our tea kits. A keep-warm function helps for second and third steeps.

With a thermometer. Boil the water, then check it as it cools. In an open kettle, water usually drops a few degrees per minute at first; how fast depends on the kettle and the amount of water.

Without any tools. You can get close by mixing. Boiling water mixed with about one quarter cold water lands near 80 °C; equal parts boiling and cold lands well below that, which is too cool for most teas. Pouring boiling water into an empty cup or pot first and then into the teapot also takes several degrees off. These methods are rough, so trust your taste over the numbers.

Teapots and infusers

Loose leaf needs room to unfurl. An infuser basket that fills most of the pot gives better results than a small ball. Glass teapots let you watch the colour, which helps you time the steep. Pre-warming the pot with a little hot water keeps the temperature from dropping too fast during the steep, which matters most for black teas. Browse our tea gear for pots and infusers.

Water itself

Very hard water can make tea dull and leave a film on top; very soft water can make it taste flat. If your tap water is hard, a jug filter often helps. Use freshly drawn water rather than water that has been boiled several times.

In short

Match the water to the leaf: cooler for greens and whites, hotter for oolongs, near boiling for black teas, pu-erh and herbals. Start from the ranges above, change one thing at a time, and let your taste guide the rest. A kettle that holds a set temperature makes it easy; a thermometer or a bit of mixing gets you most of the way there.