Lake Bled: temperature & swimming

How warm the water is right now, and where you can legally swim.

Lake Bled: temperature & swimming — Bled - Town Tools

How warm Lake Bled is right now, from the official ARSO gauge, plus where you can legally swim. Swimming is only allowed in designated bathing areas; the rest of the shore is off-limits, and that surprises people every summer.

Lake Bled at Mlino

20.8 °C — pleasant

The water is pleasant for an open-water swim right now. Reading from 13 June at 12:00.

20.8 °C

Water temperature

surface, at the station

47 cm

Lake level

običajni vodostaj

Pleasant

Comfort

how the water feels, not a safety rating

Nearby water

Station	Speaks for	Temp	Flow
Sava Dolinka at Blejski most	the cold inflow river just outside town — a sense of how cold the feeding water is	9.2 °C	22.7 m³/s

How to read the comfort word

Below 15 °C the water reads as cold: a real shock that saps stamina fast. From 15 °C it’s bracing — swimmable but sharp on entry. From 19 °C it’s pleasant for an open-water swim, and from 23 °C up it’s warm for an alpine lake. These words describe how the water feels, not whether it is safe to swim. Cold water is a hazard at any of these temperatures, the lake has deep cold layers below the surface reading, and there are no lifeguards outside the managed lidos.

Where you can swim

Designated areas only

Swimming in Lake Bled is allowed only in the designated bathing areas listed below. Swimming elsewhere along the shore is prohibited to protect a sensitive lake ecosystem, and the fine for swimming where it is not allowed is reported at €200 (cekin.si, checked 2026-06-13). When in doubt, use one of the marked areas.

Spot	Access	What to expect
Grajsko kopališče (Castle bathing area)	Paid — ≈ €9–12/day adult, ~€2 less after 15:00; students less, children under 14 ≈ €6 — confirm the current season's cenik	The main public lido below the castle, open roughly mid-June to mid-September. Lifeguarded, with lawns, diving platforms and toilets. Reviewers are sometimes surprised a 'public lido' charges — it does.
Velika Zaka	Free	Free designated bathing on the quieter west end of the lake by the rowing centre. No lido facilities; this is open shore set aside for swimming.
Mala Zaka	Free	Free designated bathing next to Velika Zaka, near the campsite. Popular, busy in peak summer.
Mlino shore	Free	Designated bathing on the southeast shore near the Mlino gauge and pletna boats.

Bathing-water quality

Latest status: Rated "Excellent" in recent seasons
Last tested: ratings published per season
Testing: Lake Bled is one of Slovenia's official bathing waters; NLZOH samples water quality roughly fortnightly from mid-June to the end of August, and results are posted at the bathing-area boards. Ratings have been consistently excellent. Check the official page below for the current season's result.

Official bathing-water results

Worth knowing

Why it's swimmable at all

Lake Bled is a glacial lake fed partly by a 23°C thermal spring, so the surface warms to roughly 22–26°C at the height of summer — genuinely warm for an alpine lake. The surface reading above is the warmest layer; deeper water stays markedly colder.

The island and the boats

Blejski otok, Slovenia's only natural island, sits in the middle of the lake. Pletna boats and rowing dominate the water; swimmers should stay inside the marked bathing areas and clear of boat lanes.

Live temperature and level from the Slovenian Environment Agency (ARSO) — Vir / Source: ARSO. Readings are surface measurements at the station, updated about every 30 minutes. Checked 13 June at 12:38.

Prices and bathing-water status are curated from official pages and carry their own verification date below.

Source: ARSO (live temperature & level); kopalisce-bled.si and bled.si (lido prices); cekin.si (swimming rules & fine), checked 2026-06-13.