Croatia · City of Zagreb
Jarun, Otok Trešnjevka
Zagreb — City of Zagreb, Croatia
On the beach
Right now
Sample dataIllustrative conditions — the live Open-Meteo marine feed wasn't reachable, so these are deterministic placeholder values that will be replaced automatically once the feed is available.
7-day outlook
Sample dataModeled placeholder forecast for demonstration — will be replaced by a live marine-weather feed.
Sea temperature
Next 7 days, °C
Wave height
Next 7 days, metres
View as table
| Day | Sea temp (°C) | Wave height (m) |
|---|---|---|
| Wed 2 | 27.9 | 0.2 |
| Thu 3 | 28.2 | 0.2 |
| Fri 4 | 28.1 | 0.3 |
| Sat 5 | 27.6 | 0.3 |
| Sun 6 | 27.2 | 0.2 |
| Mon 7 | 27.1 | 0.2 |
| Tue 8 | 27.4 | 0.2 |
Water quality history
Official EEA classification, one rating per bathing season, 2015–2025 — real data reported by national authorities.
- 2015: Not classified2015
- 2016: Not classified2016
- 2017: Not classified2017
- 2018: Good2018
- 2019: Good2019
- 2020: Good2020
- 2021: Sufficient2021
- 2022: Poor2022
- 2023: Sufficient2023
- 2024: Good2024
- 2025: Good2025
Good in the most recent season, and 5 of 8 classified years rated Excellent or Good.
- Excellent
- Good
- Sufficient
- Poor
- Not classified
View as table
| Year | Classification |
|---|---|
| 2015 | Not classified |
| 2016 | Not classified |
| 2017 | Not classified |
| 2018 | Good |
| 2019 | Good |
| 2020 | Good |
| 2021 | Sufficient |
| 2022 | Poor |
| 2023 | Sufficient |
| 2024 | Good |
| 2025 | Good |
Typical sea temperature by month
Modeled estimatePlausible seasonal climatology derived from latitude, for illustration — not a measured average.
Monthly sea temperature
Typical range across the year, °C
View as table
| Month | Typical sea temp (°C) |
|---|---|
| Jan | 14 |
| Feb | 14 |
| Mar | 15 |
| Apr | 17 |
| May | 20 |
| Jun | 23 |
| Jul | 25 |
| Aug | 26 |
| Sep | 25 |
| Oct | 23 |
| Nov | 20 |
| Dec | 17 |
Location & nearby beaches
Nearby beaches
- Jarun, Veliko jezero311 mZagreb, City of Zagreb
- Jarun, Otok Univerzijade463 mZagreb, City of Zagreb
- Jarun, Otok Veslača1.1 kmZagreb, City of Zagreb
- Jarun, Malo jezero1.3 kmZagreb, City of Zagreb
Distances calculated as straight-line (haversine) from official coordinates.
Getting there & around
- Easy by car — there's parking close to the beach.
- Bus stop: Kajakaški prilaz, about ~620 m away.
Food, stays & town
- Nearest city: Zagreb, about ~5.8 km away.
- 9 places to eat within 1 km Closest is Jarunska oaza, about ~120 m away.
- 3 shops nearby, the closest about ~600 m away
What kind of beach is this?
This beach belongs to a small coastal village. It's usually calmer than a resort or town beach, though a popular village spot can still fill up on the best summer days.
Estimated from OpenStreetMap surroundings data (ODbL).
- Families
Is the water clean at Jarun, Otok Trešnjevka?
Jarun, Otok Trešnjevka is a lake bathing site with an official EU Bathing Water rating of Good for the 2025 season — meets the EU bathing-water standard in the latest annual assessment. That annual classification comes from the EU Bathing Water Directive: national authorities test for two indicator bacteria, intestinal enterococci and E. coli, throughout the bathing season, then report the full-season results to the European Environment Agency (EEA) the following spring — the 2025 season's rating was published in spring 2026, and the 2026 season won't be rated until spring 2027. In addition to that yearly rating, some national authorities — for Croatia, IZOR (Croatia's Institute of Oceanography and Fisheries) — publish individual water sample results during the season itself, ahead of the annual report. On site you'll find Showers, Toilets, and Beach bar. There's parking about ~150 m from the beach.
Looking to avoid the busiest weeks? The water is typically warmest around August, with the most reliable swimming window running July–September; outside that stretch you'll find a cooler sea but a quieter beach. Over the 8 classified seasons on record, 5 have come back Excellent or Good — a track record worth checking each year rather than assuming.
Worth remembering: “Good” isn't a live reading, it's an annual grade — Excellent, Good, Sufficient or Poor — set once a year from that season's water samples and describing the average, not this afternoon's conditions. For what the sea is doing right now, check the “Right now” panel and 7-day outlook above. It sits in Zagreb, City of Zagreb. There are 9 places to eat within a kilometre — Jarunska oaza is the closest, about ~120 m away.
Frequently asked questions
Is it safe to go in the water at Jarun, Otok Trešnjevka?
Yes — Jarun, Otok Trešnjevka's 2025 rating is Good, one step below the top tier, with 5 of 8 classified seasons rated Excellent or Good. It's also held steady at Good for 2 straight years.
What temperature is the sea at Jarun, Otok Trešnjevka right now?
For Jarun, Otok Trešnjevka, the ~28°C figure above is a stand-in value, not a live reading — the marine-weather feed was unreachable when the page last built, and it'll swap in automatically once the feed responds again. That's the reading right off Zagreb, City of Zagreb. On the modeled climatology here, August usually runs warmest.
When is the best time to swim at Jarun, Otok Trešnjevka?
For the warmest water, aim for July–September — that's when the modeled sea temperature is typically at its best. That applies to the water around Zagreb, City of Zagreb. Within that window, August is typically the single warmest month.
How is bathing water quality actually assessed?
It's based on official water samples: authorities test for intestinal enterococci and E. coli through the season, then report the full-season results to the European Environment Agency each spring, which assigns one of four grades — Excellent, Good, Sufficient or Poor. A few national authorities, including Croatia's IZOR, also publish individual samples during the season itself, ahead of that annual report — that isn't yet available for Jarun, Otok Trešnjevka.
What's nearby Jarun, Otok Trešnjevka — parking, buses, or a ferry?
By car, it's easy — parking is right by the beach. By bus, the nearest stop is Kajakaški prilaz, about ~620 m away. The nearest town is Zagreb, about ~5.8 km away.