Croatia · Istria
Otok Katarina - Prema marini
Rovinj — Istria, Croatia
On the beach
Right now
Live conditions from Open-Meteo, refreshed hourly.
7-day outlook
7-day marine forecast from Open-Meteo.
Sea temperature
Next 7 days, °C
Wave height
Next 7 days, metres
View as table
| Day | Sea temp (°C) | Wave height (m) |
|---|---|---|
| Wed 2 | 28.0 | 0.1 |
| Thu 3 | 27.8 | 0.1 |
| Fri 4 | 27.9 | 0.0 |
| Sat 5 | 27.6 | 0.3 |
| Sun 6 | 27.9 | 0.1 |
| Mon 7 | 28.1 | 0.2 |
| Tue 8 | 28.3 | 0.3 |
Water quality history
Official EEA classification, one rating per bathing season, 2015–2025 — real data reported by national authorities.
- 2015: Excellent2015
- 2016: Excellent2016
- 2017: Excellent2017
- 2018: Excellent2018
- 2019: Excellent2019
- 2020: Excellent2020
- 2021: Excellent2021
- 2022: Excellent2022
- 2023: Excellent2023
- 2024: Excellent2024
- 2025: Excellent2025
Excellent in the most recent season, and 11 of 11 classified years rated Excellent or Good.
- Excellent
- Good
- Sufficient
- Poor
- Not classified
View as table
| Year | Classification |
|---|---|
| 2015 | Excellent |
| 2016 | Excellent |
| 2017 | Excellent |
| 2018 | Excellent |
| 2019 | Excellent |
| 2020 | Excellent |
| 2021 | Excellent |
| 2022 | Excellent |
| 2023 | Excellent |
| 2024 | Excellent |
| 2025 | Excellent |
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 | 15 |
| 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
- Otok Katarina - Uvala Lone460 mRovinj, Istria
- Hotel Rovinj - Ispod hotela537 mRovinj, Istria
- Monte Mulini - Do lukobrana546 mRovinj, Istria
- Lone - Ispod hotela Monte Mulini703 mRovinj, Istria
Distances calculated as straight-line (haversine) from official coordinates.
Getting there & around
- By car: there's parking about ~350 m from the beach.
- Bus stop: Rovinj, about ~510 m away.
- Nearest ferry landing is about ~290 m away.
Food, stays & town
- Nearest town: Rovinj, about ~700 m away.
- 62 places to eat within 1 km Closest is Caffè Cinema, about ~310 m away.
- 27 places to stay mapped nearby Closest is Island Hotel Katarina, about ~300 m away.
- 4 shops nearby, the closest about ~460 m away
What kind of beach is this?
This is a town beach, woven into the everyday fabric of a city or larger settlement — expect company on warm days, especially through July and August, alongside easy access to shops and services.
Estimated from OpenStreetMap surroundings data (ODbL).
Is the water clean at Otok Katarina - Prema marini?
Otok Katarina - Prema marini sits on a stretch of coast classed as a coastal bathing site, carrying an official EU Bathing Water rating of Excellent for the 2025 season. Under the EU Bathing Water Directive, national authorities test for intestinal enterococci and E. coli through the season and report the results the following spring — the 2025 rating was published in spring 2026, and 2026's won't follow 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. It sits in Rovinj, Istria. There's parking about ~350 m from the beach.
That rating has been consistent: every one of the 11 classified seasons on record has come back Excellent or Good. If you're timing a visit around water temperature rather than crowds, July–September is the safest bet, with August typically the peak — expect a cooler, calmer sea either side of that stretch.
“Excellent” is one point on a four-step scale — Excellent, Good, Sufficient or Poor — assigned once per year from that season's water samples, not a live reading. It describes how the site performs on average across the season, not the exact water quality this afternoon; for day-to-day sea conditions, see the “Right now” and 7-day outlook panels above. There are 62 places to eat within a kilometre — Caffè Cinema is the closest, about ~310 m away.
Frequently asked questions
Is Otok Katarina - Prema marini safe to swim in?
Otok Katarina - Prema marini is rated Excellent for 2025 — the top EU Bathing Water classification — with 11 of 11 classified seasons rating Excellent or Good, so yes. It's also held steady at Excellent for 11 straight years.
What is the sea temperature at Otok Katarina - Prema marini today?
Otok Katarina - Prema marini's sea temperature currently sits at around 28°C, based on the latest update — check the “Right now” panel above for the full live picture. That's the reading right off Rovinj, Istria. On the modeled climatology here, August usually runs warmest.
When should you plan a swimming trip to Otok Katarina - Prema marini?
For swimming, July–September is usually the best call — that's the modeled window when the sea here runs warmest. That applies to the water around Rovinj, Istria. 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 Otok Katarina - Prema marini.
Is there parking near Otok Katarina - Prema marini?
By car, there's parking about ~350 m from the beach. By bus, the nearest stop is Rovinj, about ~510 m away. There's a ferry landing about ~290 m from the beach. The nearest town is Rovinj, about ~700 m away.