Month by month
| Month | Afternoon | Sea | Rain | Verdict |
|---|---|---|---|---|
| January | 9.8 °C | 12.4 °C | 9 days | Unfavourable season |
| February | 11.3 °C | 11.1 °C | 10 days | Unfavourable season |
| March | 13.7 °C | 10.9 °C | 9 days | Possible, with trade-offs |
| April | 17 °C | 13.2 °C | 9 days | Possible, with trade-offs |
| May | 21 °C | 17.2 °C | 13 days | Pleasant — a good time to go |
| June | 26.4 °C | 22.9 °C | 9 days | Ideal — one of the best times of year |
| July | 29.3 °C | 26 °C | 7 days | Ideal — one of the best times of year |
| August | 29.3 °C | 26.6 °C | 7 days | Ideal — one of the best times of year |
| September | 24.4 °C | 24 °C | 10 days | Ideal — one of the best times of year |
| October | 19.8 °C | 20.3 °C | 10 days | Pleasant — a good time to go |
| November | 14.9 °C | 17.7 °C | 11 days | Possible, with trade-offs |
| December | 11.4 °C | 14.6 °C | 10 days | Unfavourable season |
Before you go
Three things to check once you have picked your dates.
Entry
Croatia is in the European Union. Entry rules depend on your nationality — check before booking.
Safety
No specific restrictions
Usual precautions apply.
Official advice updated 11 August 2026
Health
Recommended vaccinations, water quality, mosquitoes: advice depends on the country and the season. Some vaccines need time before departure.
Beau Fixe is not a safety or health authority. These notes summarise public advisories and link to their source; only the competent authorities are authoritative. Alert levels: Foreign, Commonwealth & Development Office (gov.uk), Open Government Licence v3.0.
FAQ
Can you swim in Rovinj in September?
The sea averages 24°C in September — swimming is possible but brisk.
How hot is Rovinj in September?
Expect 24.4°C in the afternoon and 18.2°C at night, averaged over the last 10 years.
Does it rain a lot in Rovinj in September?
Around 10 days with rain (≥ 1 mm) in the month — 35% of days.