How warm is the sea in Istra?
The sea in Istra is currently 21°C.
Sea temperature is a model estimate for the surface. We refresh marine data approximately every six hours; check the displayed data time.
The sea in Istra is 21°C today, the weather is partly cloudy, 14°C.

Croatia
Last updated:
Sources and methodologyToday Istra can expect rain, with a high of around 20°. Over the coming days the weather stays similar, with temperatures between 8° and 21°. Rain is possible: Thursday, Friday, Saturday.
Updated:
Next 48 hours
The best time to visit is from June to September. The sea is warmest in August (26.3°C).
| Month | Max | Min | Rain (days) | Sea |
|---|---|---|---|---|
| January | 10° | 5° | 9 | 13° |
| February | 11° | 6° | 10 | 12° |
| March | 13° | 8° | 9 | 13° |
| April | 17° | 11° | 9 | 15° |
| May | 21° | 15° | 12 | 18° |
| June | 26° | 20° | 7 | 22° |
| July | 29° | 22° | 6 | 26° |
| August | 29° | 23° | 6 | 26° |
| September | 24° | 18° | 10 | 24° |
| October | 20° | 14° | 11 | 20° |
| November | 15° | 10° | 13 | 18° |
| December | 12° | 7° | 11 | 15° |
Istria is Croatia's largest peninsula, at the northwestern edge of the Adriatic, known for its Italian stamp, old coastal towns and the rocky greenery behind the shore. The peninsula combines Roman heritage in Pula, Venetian towns such as Rovinj and Poreč, and an interior known for truffles and vineyards. Its beaches are mostly rocky and pebbly, with clear sea. For Macedonian visitors Istria is more appealing for a longer excursion or a flight than for a classic driving holiday. Summers are warm and dry, with August sea temperatures of around 26°, and the season runs from June to mid-September.
The sea in Istra is currently 21°C.
Sea temperature is a model estimate for the surface. We refresh marine data approximately every six hours; check the displayed data time.
The best time to visit is from June to September. The sea is warmest in August (26.3°C).
Derived from the 2015–2024 climate averages.
Tomorrow in Istra expect rain, with a high of 20°C and a low of 9°C and a 85% chance of rain.
The weekend forecast for Istra: rain on Saturday (20°/12°), rain on Sunday (16°/11°).