When Is Coffee Too Hot to Drink? The Best Drinking Temperature

Coffee is brewed with water around 90–96°C (195–205°F), but almost nobody wants to drink it that hot. So when is coffee too hot to drink? In a 2018 German tasting study, people on average called coffee “too hot” at about 66°C (151°F) and preferred to drink it at about 63°C (145°F). An earlier calculation by food scientists put the optimal serving temperature at 57.8°C (136°F). And the World Health Organization’s cancer agency classifies drinking “very hot” beverages above 65°C (149°F) as probably carcinogenic, so letting your cup cool a few minutes is a smart habit.

Below are the numbers, plus a simple cooling formula with a worked example so you can predict when your mug hits the sweet spot.

Key takeaways

• Preferred drinking temperature in one study averaged 63°C (145°F); “too hot” averaged 66°C (151°F).
• A food science model calculated 57.8°C (136°F) as the optimal serving temperature.
• IARC classifies very hot beverages above 65°C (149°F) as “probably carcinogenic to humans” (Group 2A), based mainly on studies of very hot tea and mate.
• In a typical mug, freshly brewed coffee can take roughly 10–15 minutes to fall from about 85°C to 60–65°C.

In this article

1. When is coffee too hot to drink?
2. Coffee temperature chart
3. Cooling math: when will my coffee be ready?
4. How temperature changes flavor
5. FAQ

When is coffee too hot to drink?

In 2018, Julia Dirler, Gertrud Winkler and Dirk Lachenmeier published a pilot study in the journal Foods. They had 87 people taste coffee as it slowly heated up and report their preferred temperature and the point at which it became “too hot.”

• Preferred temperature: average 63°C (145°F), range 55–70°C.
• “Too hot”: average 66°C (151°F), range 58–71°C.
• About 72% preferred coffee below 65°C.

The same paper cites earlier physiology: heat starts to feel painful at around 44–45°C on the skin, and the tongue’s pain threshold is about 46–48°C. Coffee in the cup can be hotter than that without hurting because the drink cools in your mouth, mixes with saliva and touches each spot only briefly. The authors estimated that 70°C coffee gives a tongue surface temperature of roughly 55–57°C.

What about scalding?

Short contact with very hot liquids can damage skin. The paper notes recommendations that water contact should stay below 65°C for up to 1 second and 60°C for 3–4 seconds. That is why spilled coffee straight from the brewer can scald, especially on children’s thinner skin.

The 65°C cancer classification

In 2016 the International Agency for Research on Cancer (IARC) classified drinking very hot beverages, above 65°C, as probably carcinogenic to humans, mainly because of studies linking very hot tea and mate to esophageal cancer. Coffee itself was not classified as carcinogenic. The practical takeaway is not to fear coffee, but to avoid gulping it scalding hot.

Coffee temperature chart

To convert: °F = °C × 9/5 + 32, and °C = (°F − 32) × 5/9.

Cooling math: when will my coffee be ready to drink?

Coffee cools roughly according to Newton’s law of cooling: the hotter it is compared with the room, the faster it loses heat.

T(t) = T(room) + [T(start) − T(room)] × e^(−k × t)

Here t is time in minutes and k is a cooling constant that depends on your mug, lid, volume and whether you added milk. Rearranged to find the waiting time:

t = ln{[T(start) − T(room)] ÷ [T(target) − T(room)]} ÷ k

Worked example

You pour coffee at 85°C into a ceramic mug in a 22°C kitchen. After 8 minutes it reads 70°C. First find k:

k = ln[(85 − 22) ÷ (70 − 22)] ÷ 8 = ln(63 ÷ 48) ÷ 8 ≈ 0.034 per minute.

Using k ≈ 0.035, here is the predicted curve:

In this example, the coffee drops below 65°C after about 11 minutes and reaches the 57.8°C “optimal” point after about 16 minutes. Your numbers will differ: a lidded travel mug cools far more slowly, a small espresso cup much faster. Measure two points with a kitchen thermometer to find your own k.

Faster ways to cool coffee

• Add a splash of cold milk; it can drop the temperature several degrees instantly.
• Pour into a room-temperature mug rather than a preheated one.
• Stir or pour between two cups.
• Use an open, wide mug instead of an insulated one.

How temperature changes coffee flavor

Very hot coffee mutes flavor: your tongue is busy registering heat, and bitterness tends to dominate. As it cools into the 50s °C, sweetness, fruit and acidity become easier to taste. That is why professional cuppers taste coffee repeatedly as it cools; see our coffee cupping guide. If you are curious why iced and hot versions of the same beans taste different, the same principle applies.

Brewing temperature is a different subject from drinking temperature; for that, see coffee brewing temperature.

Coffees that reward patience

Let a cup cool a little and good beans open up. Ethiopia Natural reveals ripe fruit and milk chocolate as it cools, Kenya Nyeri turns juicier with orange and lemon notes, and Colombia Medellin moves from chocolate to dried orange and berry. All are roasted 1–5 days before delivery.

Coffee too hot to drink FAQ

What temperature should coffee be served at?

Many cafés serve around 70–80°C, which most people then let cool. Research on preference points to roughly 58–63°C for drinking.

Is hot coffee bad for you?

Coffee itself is not classified as carcinogenic, but IARC classifies very hot drinks above 65°C as probably carcinogenic. Letting coffee cool a few minutes is a simple precaution.

How long should I wait before drinking coffee?

In a typical ceramic mug, around 10–15 minutes after pouring, depending on the mug, volume and room temperature.

Why does coffee taste better slightly cooler?

Our ability to taste sweetness and subtle flavors improves when the drink is not scalding hot.

Sources

1. Dirler J, Winkler G, Lachenmeier DW. What Temperature of Coffee Exceeds the Pain Threshold? Pilot Study of a Sensory Analysis Method as Basis for Cancer Risk Assessment. Foods, 2018. PMC6025158.
2. Brown F, Diller KR. Calculating the optimum temperature for serving hot beverages. Burns, 2008. PubMed.
3. Loomis D et al. Carcinogenicity of drinking coffee, mate, and very hot beverages. The Lancet Oncology, 2016. DOI.

Facts checked in October 2026.

This article is for general information only and is not medical advice. If you have a health condition, are pregnant or take medication, ask your doctor before changing your caffeine intake.

Keep reading: How to keep coffee hot in a thermos · How to reheat coffee · Single Origins