Jellyfish do appear periodically along the Adriatic coast, most often in late summer — August and September — when sea temperatures peak and currents shift. Sightings are unpredictable: some years are nearly jellyfish-free, others see brief blooms near certain bays. Locals usually know quickly when jellyfish are in the water, and beach bar staff are a good first source of information. Wearing water shoes and carrying antihistamine cream is a sensible precaution.
The bura (bora) is a cold, dry northeast wind that can arrive suddenly, especially in spring and autumn, occasionally whipping up choppy surf and cooling temperatures sharply. In peak summer (July–August) the bura is rare on the southern coast; you're more likely to encounter the gentler maestral sea breeze, which actually makes hot afternoons very pleasant. On open-sea beaches like Velika Plaza near Ulcinj, wind is a feature rather than a bug — kitesurfers deliberately seek it out.
For the calmest conditions, the sheltered bays of the Bay of Kotor (Herceg Novi to Kotor) are naturally protected from most open-sea swell and strong winds throughout the season.