Sea Temperature in Lošinj Island in October (2026) – Swimming Guide
Sea temperature in Lošinj Island in October averages 19.8°C (typical range 17.6°C–22.2°C). Swimming conditions, 10-day trends, and top beaches.
Typical Range: 17.6°C – 22.2°C
Standard swimwear is fine for quick dips. For toddlers and sensitive swimmers, a thin 2mm shorty wetsuit is recommended.
Povoljni termički uvjeti za cjelodnevni boravak uz more
8 rainy days · UV Index 4
Sea Temperature Progression in October by Decade
Multi-year oceanographic measurements across early, mid, and late month:
Annual Oceanographic Climatology for Lošinj Island
Multi-year historical records by the Croatian Meteorological and Hydrological Service (DHMZ) & Institute of Oceanography and Fisheries (IZOR)
| Month | Sea Temperature | Day Air | Night Air | Sun Hours | Rain Days | Swimming Verdict |
|---|---|---|---|---|---|---|
| January | 12°C (10.2° – 13.6°) | 10.2°C | 4.1°C | 4.2 h | 7 d | Crisp & cool |
| February | 11.3°C (9.6° – 12.8°) | 11.1°C | 4.5°C | 5.1 h | 6 d | Crisp & cool |
| March | 12.6°C (11° – 14.3°) | 14.2°C | 7.2°C | 6.4 h | 7 d | Crisp & cool |
| April | 15°C (13.3° – 17.3°) | 18.1°C | 10.5°C | 7.8 h | 8 d | Crisp & cool |
| May → | 18.4°C (16° – 20.8°) | 22.8°C | 14.8°C | 9.2 h | 7 d | Refreshing & invigorating |
| June → | 22.6°C (19.6° – 25.2°) | 26.9°C | 18.6°C | 10.5 h | 6 d | Comfortable & warm |
| July → | 25.2°C (23° – 27.6°) | 29.8°C | 21.2°C | 11.8 h | 4 d | Very warm & ideal |
| August → | 26.2°C (24.2° – 28.6°) | 29.6°C | 21°C | 11 h | 4 d | Very warm & ideal |
| September → | 23.5°C (21.2° – 25.6°) | 24.8°C | 17.1°C | 8.6 h | 6 d | Comfortable & warm |
| October → | 19.8°C (17.6° – 22.2°) | 19.6°C | 13°C | 6.2 h | 8 d | Refreshing & invigorating |
| November | 16.3°C (14.4° – 18°) | 14.9°C | 8.8°C | 4.5 h | 9 d | Crisp & cool |
| December | 13.6°C (11.8° – 15°) | 11°C | 5.2°C | 3.8 h | 8 d | Crisp & cool |
Top Rated Beaches in Lošinj Island for this Season
Curated bathing spots featuring verified water cleanliness and supreme swimming comfort (34 verified locations):
Expert Swimming & Marine Tips
🌬️ Winds & Marine Currents
Summer afternoons regularly welcome the refreshing Maestral (NW) sea breeze. A strong Bura (NE) wind can temporarily drop surface water temperatures by 1–2°C, especially in shallow coastal coves.
☀️ Sun Protection & UV Exposure
In peak summer months, the UV index regularly surpasses 8. Limit unprotected sunbathing between 11:00 AM and 4:00 PM, and always use high-factor water-resistant sunscreen.
🤿 Water Clarity & Sea Urchins
The Adriatic Sea here consistently scores excellent water quality under EU bathing water directives. Sea urchins on rocky shallows serve as nature’s bio-indicator of immaculate water purity.
Frequently Asked Questions – Sea Temperature in Lošinj Island
Is it warm enough to swim in Lošinj Island in October?
In October, average sea temperature in Lošinj Island is 19.8°C. Refreshing & invigorating / Best for active swimming. Standard swimwear is fine for quick dips. For toddlers and sensitive swimmers, a thin 2mm shorty wetsuit is recommended.
What is the air temperature and daily sunshine in October?
Average daytime air temperature reaches 19.6°C (13°C at night), featuring approximately 6.2 hours of bright sunshine daily and only 8 rainy days.
How does sea temperature evolve from early to late October?
During early October (1st–10th) water averages 20.7°C, mid-month (11th–20th) sits at 19.8°C, and late month (21st–31st) reaches 18.9°C.