Istria is a coastal area of Croatia on the Adriatic Sea, with 38 tracked beaches. The sea here ranges from about 12°C in the coolest month to 26°C at the summer peak, with roughly 5 months a year sitting above 20°C — the level most swimmers describe as pleasant without a wetsuit. Use the beach list below to check the current sea temperature at each spot before you head out.
Istria
38 tracked beaches in Istria, Croatia, with live Adriatic Sea temperatures.
Sea
Adriatic Sea
Avg sea temp now
23.1°C
Best months
June – October
Best time to swim in Istria
The sea in Istria peaks in August, when the water averages around 26°C.
The main swimming season runs from June – October, when surface temperatures stay comfortable for extended sessions.
On average, 5 months a year sit above 20°C — the threshold most swimmers describe as pleasant without a wetsuit.
Shoulder months like May and November are noticeably cooler but often quieter, with fewer crowds and steadier weather.
Outside peak season the water drops toward 15°C, so a 3/2mm shorty or full wetsuit makes long swims much more comfortable.
The coldest month is typically February at around 12°C, when cold-water swimmers dominate the coast.
Istria sea temperature history
Long-term climatology for Istria shows an annual mean sea temperature of 18°C, ranging from 12°C in winter to 26°C at the summer peak.
The seasonal swing is roughly 14°C between the coldest and warmest month — a useful yardstick when comparing years or checking whether the current sea is running above or below average.
Recent decades have trended slightly warmer at Istria, in line with regional sea-surface temperature records for the wider basin.
Monthly averages below are drawn from multi-decadal climatology and are updated as new observations arrive.
Jan
13°C
Feb
12°C
Mar
13°C
Apr
15°C
May
19°C
Jun
23°C
Jul
25°C
Aug
26°C
Sep
23°C
Oct
20°C
Nov
17°C
Dec
14°C
Values are area averages; individual beaches vary by exposure and depth.
Istria sea temperature: frequently asked questions
What is the warmest month to swim in Istria?
August is the warmest month in Istria, when the sea averages about 26°C. Late-season warmth often persists a few weeks after peak.
When is the sea coldest in Istria?
The coldest month in Istria is typically February, when the water averages around 12°C. Cold-water swimmers and surfers dominate this period.
When can you swim in Istria without a wetsuit?
The main swimming season in Istria runs from June – October — about 5 months a year when the sea sits above 20°C, the level most swimmers describe as pleasant without a wetsuit.
Do I need a wetsuit in Istria?
Outside peak summer the water in Istria drops toward 15°C, so a 3/2mm shorty or full wetsuit makes long swims much more comfortable. In peak months most swimmers go without.
What is the average sea temperature in Istria?
The long-term annual mean sea temperature in Istria is about 18°C, based on multi-decadal climatology of the surrounding waters.
How do I check the current sea temperature in Istria?
The live reading at the top of this page shows the current sea temperature in Istria, updated hourly from marine buoy and satellite data. The 7-day forecast covers water, air, waves, wind and UV for the week ahead.
Beaches in the Istria
Ranked by current live sea temperature.
- 1Maslinica Beach RabacRabac, Croatia23.7°C
- 2Kamenjak BeachPremantura, Croatia23.6°C
- 3Zlatne StijenePula, Croatia23.6°C
- 4Bijela UvalaUmag, Croatia23.6°C
- 5Lone BayRovinj, Croatia23.5°C
- 6Brulo BeachPorec, Croatia23.5°C
- 7Karpinjan BeachNovigrad, Croatia23.5°C
- 8Hawaii BeachPula, Croatia23.4°C
- 9AmbrelaPula, Croatia23.4°C
- 10Stoja BeachPula, Croatia23.4°C
- 11Zelena LagunaPorec, Croatia23.4°C
- 12Girandella BeachRabac, Croatia23.4°C
- 13BelvedereVrsar, Croatia23.3°C
- 14Delfin BeachPorec, Croatia23.3°C
- 15Materada BeachPorec, Croatia23.3°C
- 16Icici BeachIcici, Croatia23.3°C
- 17Ambrela BeachPula, Croatia23.2°C
- 18Verudela BeachPula, Croatia23.2°C
- 19Valalta BeachRovinj, Croatia23.2°C
- 20Zlatni Rat IstriaPorec, Croatia23.2°C
- 21Medveja BeachMedveja, Croatia23.2°C
- 22Bijeca BeachMedulin, Croatia23.1°C
- 23St Andrea BeachRabac, Croatia23.1°C
- 24Blue Lagoon PorecPorec, Croatia23.0°C
- 25Plava LagunaPorec, Croatia23.0°C
- 26Ulika BeachPorec, Croatia23.0°C
- 27Duga UvalaRabac, Croatia23.0°C
- 28Cuvi BeachRovinj, Croatia22.9°C
- 29Amarin BeachRovinj, Croatia22.9°C
- 30Skaraba BeachRovinj, Croatia22.9°C
- 31Saccorgiana BeachPula, Croatia22.8°C
- 32Valkane BeachPula, Croatia22.6°C
- 33Mulini BeachRovinj, Croatia22.6°C
- 34Kanova BeachUmag, Croatia22.6°C
- 35Havajsko MoreRovinj, Croatia22.5°C
- 36Val de LessoRovinj, Croatia22.5°C
- 37Rivarela BeachNovigrad, Croatia22.4°C
- 38Laguna MaredaNovigrad, Croatia22.4°C
Swimming in the Istria — FAQ
How warm is the sea in the Istria in September?
The Adriatic Sea off the Istria averages about 23.0°C in September, based on long-term monthly averages for this coast.
When is the best time to swim in the Istria?
The Istria is warmest in August (around 26.0°C) and coldest in February (around 12.0°C). There are typically 4 months a year when the water sits above 22°C.
What is the average yearly sea temperature in the Istria?
Across all twelve months, the sea in the Istria averages about 18.3°C.
Do you need a wetsuit to swim in the Istria?
In peak season (around August, ~26.0°C) most swimmers are comfortable without a wetsuit. Outside summer, when the water drops toward 12.0°C, a 3/2mm to 5/4mm wetsuit is recommended.