Water Temperature Guide: Why 100°C Ruins Your Green Tea

If you only learn one thing about brewing tea properly, learn this: water temperature is the single most important variable, and most home drinkers get it badly wrong.

Why temperature matters. Different tea families contain different ratios of compounds — catechins (bitter), amino acids (sweet/savoury), volatile aromatic compounds (floral). These compounds extract at different temperatures. Pour 100°C water on a delicate green tea and you'll extract bitter catechins quickly, though sweet amino acids also dissolve readily; high heat simply emphasizes bitterness. The result: bitter, harsh, dishwater green tea.

The complete temperature guide:

• White tea (Silver Needle): 75–80°C, 4 minutes

• White tea (White Peony): 85°C, 4 minutes

• Japanese green (sencha): 70°C, 1 minute

• Japanese green (gyokuro): 50–60°C, 2 minutes

• Chinese green (Longjing, Bi Luo Chun): 75–80°C, 1.5 minutes

• Yellow tea: 80°C, 3 minutes

• Light oolong (Tieguanyin, Taiwan high mountain): 85–90°C, gongfu-style 15-second infusions

• Heavy roasted oolong (Wuyi rock teas): 95°C, gongfu-style 10-second infusions

• Black tea (Darjeeling): 90°C, 3–4 minutes

• Black tea (Assam, Ceylon, Keemun): 95–100°C, 3–5 minutes

• Pu-erh and dark teas: 95–100°C, gongfu-style 10–20 second infusions

• Tisanes (chamomile, rooibos, herbal, fruit): freshly boiled water and at least 5 minutes, or as the packaging directs — for herbal and fruit infusions this is a hygiene recommendation (BfR), not just a flavour preference, so don't go cooler

How to hit the temperature. Honestly: use a thermometer or a variable-temperature kettle. Cooling times depend so heavily on water volume, the kettle's material, whether the lid is on and the room temperature that no fixed number of seconds can promise a target temperature. If you have neither, pouring boiled water between two vessels drops it by several degrees per pour and is a reasonable approximate way to cool water for green tea — but treat it as a rough technique, not a calibration.

The single biggest improvement you can make to your home tea? Buy a kettle with adjustable temperature settings. Decent variable-temperature kettles cost $40–60 and will save you years of mediocre cups.