Sauna in summer: why the ritual doesn’t stop in July

Most of us treat the sauna as a winter thing — packed away in spring with the coats, on the logic that heat only makes sense when it’s cold outside. The Finns see it the other way round. Midsummer — juhannus — is the biggest sauna night of their year: families head to lake cottages, cut fresh birch whisks that week, and light the stove in broad daylight.

The practice carries on through the warm months because it was never really about the weather. Heat, contrast and an hour with nothing scheduled in it are all still on offer in July. Here’s how the ritual changes with the season — and why we’d argue it gets better.

Move the session to the evening

The main thing summer changes is when you go. A winter session is an afternoon affair, dark by the time you towel off. In summer, light the stove at eight and finish by ten, so the whole slow cool-down happens outdoors in the long evening light.

For our money this is the best version of the ritual. The pause between rounds — which winter forces indoors, next to a radiator — becomes twenty minutes on a garden bench with steam rising off your shoulders and the swifts still up. The heat’s the same as ever. Everything around it has relaxed.

The cold half gets easier

The plunge softens too. The sea and the lakes are as warm as they’ll ever be, which makes summer the kindest season to learn the cold half of the ritual — the same contrast we wrote about in our essay on the plunge, with the edges rounded off. In a heatwave, a cool shower does the job. So does a garden hose, honestly. The point was never the suffering — it was the change of state.

And the heat still earns its keep. A sauna in July is hotter than any British summer day by sixty degrees or more. If anything, the session feels easier in summer — you arrive already loose, the sweat comes sooner, and the first round takes less out of you than it does in January.

Run it lower and slower

Summer suits a gentler protocol. Run the stove a little lower and sit a little longer. Take three unhurried rounds rather than two fierce ones. Prop the door open between rounds and let the evening in.

The kit doesn’t change with the season, which is one of the quiet virtues of wool — felt insulates against the ceiling heat in July exactly as it does in January. And the sauna you keep going through summer is the one that’s still a habit when the cold comes back.