Tooting Bec Lido

Monthly water temperature temperature

The surface runs about 19.5 °C in August. The annual low is 4.5 °C in January and the high is 19.5 °C in July. No pronounced summer thermocline is recorded here. For October, the mean surface figure is 13 °C.

Mean water temperature by month (°C)

Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
4.5	4.5	6.5	10	14	17.5	19.5	19.5	17	13	9	6

Safety safety

Filled from the mains each season and treated with chlorine and UV, with daily testing. It is a pool, not a natural water body, so there is no algal or agricultural risk — the trade-off is chlorinated water and an unheated 4–5 °C winter temperature for club swimmers.

Safety notes (3)

• There is no shallow end. Non-swimmers should not enter; the pool is 2 m deep for almost its entire length.
• The pool is unheated. In May and September the water is 10–14 °C — cold enough that a 30 minute session is a real cold-water swim even in a sunny month.
• Sessions are ticketed with capacity limits and the pool closes for club races on Sunday mornings. Check the timetable before travelling.

Where to get in

• Western shallow steps — Three wide steps into 0.6 m, then a rail down to 2 m. The standard entry.
• Poolside ladder — Ladders along both long sides, the quickest way in for laps.

On site

• Changing cubicles, hot showers and lockers
• Café and a large sunbathing lawn with deckchairs
• South London Swimming Club races on Sunday mornings, year round

Getting there arrival · entry · exit

Getting there

The lido is on Tooting Bec Common, five minutes' walk from Tooting Bec tube (Northern line) via Bedford Hill. From the A214 car park it is a two minute walk to the entrance.

Sessions run in blocks with a capacity cap, so buy in advance in July and August. Early morning and the last session of the day are the quietest.

Getting in

Start from the western steps, then move to a lane. Lap swimming runs anticlockwise and the regulars are fast; the slow lane is genuinely slow, which makes the lido unusually friendly for a beginner doing lengths.

Because the pool is a constant 2 m and 91 m long, 18 lengths is exactly one mile (1.6 km) with no turns to break your rhythm other than the two ends. That is the local benchmark.

Getting out

Use the western steps. The poolside ladders are steel and get very cold — in May and September that is a bigger deal than it sounds.

Hot showers and the café make this the most comfortable cold-water venue on this list for a winter or shoulder-season swim.

Depth profile

A rectangular pool with a genuinely uniform depth: 2 m across almost the whole 91 m length, with three shallow steps at the western end for entry. There is no shallow end in the usual sense, which makes it unsuitable for non-swimmers but excellent for laps.

Season window

May to September for public swimming; the club swims year round

Cold-water questions

How big is Tooting Bec Lido?

91 m by 30 m — the largest freshwater outdoor pool in England by surface area, with a uniform 2 m depth along almost its whole length.

Is Tooting Bec Lido heated?

No. It has been unheated since it opened in 1906, which is why the winter club swimming here is genuinely a cold-water discipline rather than a warm dip.