Why Hot Water Makes Matcha Bitter — And How to Fix It

Why does matcha taste bitter?

If your matcha tastes bitter, you're not alone — this is one of the most common issues people run into when making matcha at home.

In many cases, the issue comes down to one simple factor:

👉 water temperature

Matcha is more sensitive than regular tea

Unlike loose-leaf tea, matcha is made from finely ground tea leaves that are fully consumed.
This means you are taking in all of its natural components, including:

• Theanine (amino acids) — responsible for umami and sweetness
• Catechins (polyphenols) — responsible for bitterness and astringency
  

Because everything is present in the cup,
👉 balance matters more than extraction

Why hot water makes matcha taste bitter

The key is not that components disappear — but that their balance changes in how we perceive them.

1. Bitterness becomes more noticeable at higher temperatures

Catechins, which contribute to bitterness and astringency, are known to:

• be more readily extracted at higher temperatures
• become more noticeable in taste under those conditions
  

👉 As a result, bitterness and astringency tend to stand out more in hot water

2. Umami becomes less noticeable

Theanine provides a smooth, soft umami taste.

However:

• it is delicate
• and can be overshadowed when stronger tastes are present
  

👉 When bitterness increases,
umami becomes less noticeable (a masking effect)

3. The balance shifts

Matcha flavour is not about a single component — it is about how different tastes interact.

• 70–80°C
  → smoother, balanced, more umami-forward
• 90–100°C 
  → bitterness and astringency dominate
  

👉 This shift in balance is what makes matcha taste “too bitter”

A common misconception

You may hear that: “Hot water destroys theanine.”

In reality, under normal preparation temperatures,
👉 this is not the main reason for bitterness.

Instead,
👉 the perceived balance changes — not necessarily the presence of the compounds

Why this happens often in New Zealand

In New Zealand, electric kettles are widely used.

That means:

👉 boiling water is often used directly

This can easily lead to:

• harsher flavour
• less perceived smoothness
  

Water mineral content can also play a role depending on the region. 

How to fix bitter matcha

You don’t need special equipment.

✔ Let the water cool

After boiling, wait 1–2 minutes
→ this usually brings it to ~70–80°C

✔ Pour into another cup first

Transferring water reduces temperature naturally.

✔ Try different water

If needed:

• filtered water
• bottled water
  

can improve taste balance

If your matcha still tastes off, water quality can also play a role.
→ Learn how water affects matcha in New Zealand

What matcha should taste like

High-quality matcha is not supposed to be overwhelmingly bitter.

Instead, it should feel:

• smooth
• gently sweet
• balanced with a clean finish
  

If bitterness dominates,
👉 it is often a preparation issue, not just the matcha itself.

Not all matcha is designed to taste smooth.

→ Discover what makes high-quality matcha different

A small change makes a big difference

Matcha is simple, but sensitive.

A small adjustment in temperature can turn:

• a bitter cup
  into
• a smooth, balanced one
  

If your matcha doesn’t taste right, start by adjusting the water temperature.
It is often the simplest and most effective fix.