Croatia · Istria
Otok Katarina - Uvala Lone
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 - Prema marini460 mRovinj, Istria
- Monte Mulini - Do lukobrana531 mRovinj, Istria
- Lone - Ispod hotela Monte Mulini676 mRovinj, Istria
- Hotel Rovinj - Ispod hotela700 mRovinj, Istria
Distances calculated as straight-line (haversine) from official coordinates.
Getting there & around
- By car: there's parking about ~1.1 km from the beach.
- Bus stop: Tourist Train, about ~930 m away.
- Ferry: Porto Valdibora - Rovigno, about ~1.0 km away.
Food, stays & town
- Nearest town: Rovinj, about ~1.2 km away.
- 104 places to eat within 1 km Closest is Bistro Plaža, about ~70 m away.
- 14 places to stay mapped nearby Closest is Island Hotel Katarina, about ~200 m away.
- 5 shops nearby, the closest about ~740 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).
- Water sports
Is the water clean at Otok Katarina - Uvala Lone?
Otok Katarina - Uvala Lone 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 ~1.1 km 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 104 places to eat within a kilometre — Bistro Plaža is the closest, about ~70 m away.
Frequently asked questions
Is it safe to go in the water at Otok Katarina - Uvala Lone?
Yes — Otok Katarina - Uvala Lone carries the top EU Bathing Water classification, Excellent, for 2025, and 11 of its 11 classified seasons have rated Excellent or Good. It's also held steady at Excellent for 11 straight years.
What temperature is the sea at Otok Katarina - Uvala Lone right now?
Otok Katarina - Uvala Lone'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 is the best time to swim at Otok Katarina - Uvala Lone?
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 Rovinj, Istria. Within that window, August is typically the single warmest month.
Where does the water quality rating come from?
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 - Uvala Lone.
Is there parking near Otok Katarina - Uvala Lone?
By car, there's parking about ~1.1 km from the beach. By bus, the nearest stop is Tourist Train, about ~930 m away. By ferry, the nearest landing is Porto Valdibora - Rovigno, about ~1.0 km away. The nearest town is Rovinj, about ~1.2 km away.