Sea Temperature in Omiš by Month (2026) – Swimming Guide
Official oceanographic sea water temperatures in Omiš by month (May to October). Historical averages, swimming comfort verdicts, and 6 verified beaches.
Typical Range: 24.7°C – 29°C
Standard swimwear. No wetsuit needed; water is warm and welcoming even for infants.
Povoljni termički uvjeti za cjelodnevni boravak uz more
2 rainy days · UV Index 9
Annual Oceanographic Climatology for Omiš
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 | 14.2°C (12.6° – 15.7°) | 13°C | 6.6°C | 5 h | 8 d | Crisp & cool |
| February | 13.4°C (11.8° – 14.8°) | 13.5°C | 6.9°C | 5.8 h | 7 d | Crisp & cool |
| March | 14.4°C (12.8° – 16°) | 16.1°C | 9.1°C | 7 h | 7 d | Crisp & cool |
| April | 16.6°C (15° – 18.8°) | 19.7°C | 12.2°C | 8.5 h | 7 d | Crisp & cool |
| May → | 20.2°C (18° – 22.7°) | 24.4°C | 16.5°C | 10 h | 5 d | Refreshing & invigorating |
| June → | 24.3°C (21.7° – 27°) | 28.7°C | 20.3°C | 11.5 h | 4 d | Comfortable & warm |
| July → | 26.6°C (24.7° – 29°) | 31.7°C | 23.1°C | 12.5 h | 2 d | Very warm & ideal |
| August → | 27°C (25° – 29.4°) | 31.6°C | 22.9°C | 11.8 h | 2 d | Very warm & ideal |
| September → | 24.7°C (22.4° – 26.8°) | 26.7°C | 18.7°C | 9.4 h | 4 d | Very warm & ideal |
| October → | 21.3°C (19.2° – 23.6°) | 21.8°C | 14.9°C | 7.2 h | 7 d | Refreshing & invigorating |
| November | 18.2°C (16.2° – 20°) | 17°C | 10.6°C | 5.2 h | 9 d | Refreshing & invigorating |
| December | 15.4°C (13.7° – 17°) | 13.6°C | 7.5°C | 4.4 h | 8 d | Crisp & cool |
Top Rated Beaches in Omiš for this Season
Curated bathing spots featuring verified water cleanliness and supreme swimming comfort (6 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 Omiš
When is the sea warmest for swimming in Omiš?
The sea in Omiš reaches its warmest temperatures in July and August, averaging 27°C with highs reaching 29.4°C.
How long is the swimming season in Omiš?
The swimming season in Omiš officially spans from May through late October. The prime window for comfortable swimming without a wetsuit is from mid-June to late September.
How clean is the seawater in Omiš?
According to official monitoring by the Institute of Oceanography and Fisheries (IZOR), bathing spots in Omiš achieve 'Excellent' water quality in over 95% of samples.