The same sourdough recipe can behave very differently from one bake to the next. In a cool kitchen, the dough may still look quiet when the recipe says bulk fermentation should be finished. In summer, it may be ready sooner than expected. The ingredients have not changed. The conditions have.

For anyone baking regularly, dough temperature is one of the most useful variables to measure. During my years as a chef and artisan sourdough baker, including building Healthy Nasti Kitchen as a microbakery, repeatability mattered as much as a beautiful loaf. Here is a practical method for controlling the starting conditions without treating the clock as the final authority.

What is desired dough temperature?

Desired dough temperature (DDT) is the temperature you aim for immediately after mixing. It is a starting condition for fermentation, not a promise that the dough will remain at that temperature. For many wheat-based sourdough formulas, 24–26°C is a useful starting range, but it is not universal. Flour type, inoculation, fermentation schedule and the proportion of rye or other grains can call for a different target.

The temperature of the water is only one part of the equation. Flour, starter, the room and heat generated during mixing all contribute. This is why pouring 25°C water into a bowl does not guarantee 25°C dough.

Why Australian seasons change your fermentation

Flour stored in a cool pantry can start several degrees below the kitchen temperature. In warmer weather, the bowl, bench and flour may all be warm before mixing begins. Starter temperature and maturity also vary. Within normal bread-making conditions, warmer dough generally ferments faster; cooler dough generally ferments more slowly. But speed is not the whole story: acidity, dough strength and handling also influence the final loaf.

Four readings to take before you mix

• Flour temperature: measure the flour itself, not just the room.
• Room temperature: note the mixing and fermentation environment.
• Starter or levain temperature: record it alongside how ripe the culture is.
• Water temperature: adjust this deliberately rather than relying on how warm it feels.

Then take the finished dough temperature immediately after mixing. If you use a mixer, note its speed and mixing time: mechanical work can warm the dough, and the amount varies by equipment and batch.

A practical water-temperature calculation

A traditional four-factor desired-dough-temperature estimate for a dough made with levain is: water temperature ≈ (4 × target dough temperature) − flour temperature − room temperature − levain temperature − friction factor.

Consider a hypothetical batch targeting 25°C: flour 22°C, room 24°C, levain 23°C and an estimated mixing-friction factor of 2°C. The calculation is (4 × 25) − 22 − 24 − 23 − 2 = 29°C. Try water around 29°C, then measure the actual dough temperature and refine the next batch.

This formula is an approximation, not a precise thermal model. The friction factor must be estimated or calibrated for your mixing method. For further technical background, see King Arthur Baking’s desired dough temperature guide and its friction-factor explanation. These are published references; the numerical example above is illustrative, not a claimed bakery test.

What temperature tells you — and what it does not

At around 20–22°C, a wheat sourdough may progress more slowly than the recipe assumes. At around 24–26°C, many wheat-based doughs ferment at a manageable pace. At 27–29°C, fermentation may move more quickly and the window for shaping can narrow. These are broad tendencies, not fixed proofing schedules.

A young starter, a mature levain, a high wholegrain percentage and a different starter quantity can all change the result at the same dough temperature. Use the thermometer to understand your starting point; use the dough to decide what happens next.

Read the dough instead of relying on the clock

During bulk fermentation, look for a meaningful increase in volume, a more aerated surface, developing elasticity and gas retention. A straight-sided container or small aliquot sample can make the rise easier to compare. The correct amount of rise depends on your dough temperature, formula and intended final proof — it is not always doubling.

If the dough is cool and still dense, extending fermentation may be more useful than shaping because a timer has expired. If it is warm and already well aerated, waiting for a published time can push it too far. For a deeper look at starter maturity, read Your Sourdough Starter Is Not a Clock.

A three-bake temperature log

• Before mixing: record flour, water, room and levain temperatures.
• After mixing: record dough temperature, mixing time and method.
• During bulk: note temperature, rise and dough strength at consistent intervals.
• At shaping: describe how the dough handles and why you decided bulk was complete.
• After baking: note volume, crumb and flavour. Keep the formula stable while learning from temperature changes.

After three bakes, compare the records. If your dough repeatedly finishes cooler than intended, adjust the water temperature modestly. If it finishes too warm, cool the water or review mixing friction. If the dough hits its target but behaves differently, investigate starter maturity, flour and the temperature during bulk.

Why this matters in a microbakery

Fermentation affects more than the loaf. It determines when shaping begins, when benches become available and whether production fits collection and delivery times. A repeatable temperature routine is one part of a sustainable production system. For the financial side, see Before You Start a Microbakery: Calculate These Five Numbers.

Our free Sourdough Precision calculator helps scale formulas and manage baker’s percentages; keep temperature notes separately. When preparing for final proof, choose a banneton appropriate to your dough weight and shape.

The principle: control the starting temperature, observe fermentation and learn from the finished bread. For more practical baking guidance, join the SA Bakery Supplies Baking Journal.