Water Temperature
The temperature of water when it contacts coffee grounds. This is one of the most powerful extraction variables - hotter water extracts faster and more completely.
How It Affects Your Coffee
📊 Extraction
Every 10°C increase roughly doubles extraction speed. 85°C vs 95°C is dramatic.
👅 Taste
Hotter water brings out body, sweetness, bitterness. Cooler water emphasizes acidity, clarity.
🎯 Difficulty
Moderately difficult - requires thermometer or temperature-controlled kettle
💡 Pro Tips
- •Boiling water (100°C) is NOT always ideal - it can over-extract and create bitterness
- •Light roasts need hotter water (94-98°C) because they're harder to extract
- •Dark roasts work better with cooler water (88-92°C) to avoid harsh bitterness
- •If your coffee is sour, try increasing temperature by 3-5°C first
- •Let boiling water rest 30-60 seconds to reach 92-95°C range
- •Water temperature drops 2-5°C when it hits coffee - factor this in
⚠️ Common Mistakes
- ✗Using lukewarm water (<85°C) and wondering why coffee is weak and sour
- ✗Pouring boiling water on dark roasts - instant over-extraction
- ✗Not preheating equipment - cold Aeropress can drop temp by 10°C
- ✗Trusting kettle thermometers - they can be off by 5°C
⚙️ Equipment-Specific Advice
☕ Aeropress
88-95°C. Start at 92°C. Can go lower (85°C) for dark roasts or longer steeps (3+ min).
🥃 French Press
92-96°C. Higher temps work because you can't agitate coffee bed to over-extract.
🫗 Pour Over
90-96°C depending on roast. Continuous pour cools water, so start hotter.
🎮 Coming Soon: Interactive Simulator
Experiment with water temperature in real-time and see how it affects your coffee taste profile.
🔗 Related Variables
These variables interact with water temperature:
🎯 Apply This Knowledge
📚 Learning Progress
🚀 Complete all 8 variable pages to unlock advanced simulators in Phase 1.1!