Month by month
| Month | Afternoon | Sea | Rain | Verdict |
|---|---|---|---|---|
| January | 5.6 °C | 8.1 °C | 8 days | Unfavourable season |
| February | 8.1 °C | 6.9 °C | 6 days | Unfavourable season |
| March | 9.9 °C | 7.4 °C | 8 days | Unfavourable season |
| April | 14.5 °C | 10.3 °C | 8 days | Possible, with trade-offs |
| May | 19 °C | 15.5 °C | 8 days | Pleasant — a good time to go |
| June | 24.4 °C | 21.4 °C | 9 days | Ideal — one of the best times of year |
| July | 27 °C | 24.7 °C | 6 days | Ideal — one of the best times of year |
| August | 27.2 °C | 25.4 °C | 4 days | Ideal — one of the best times of year |
| September | 23.3 °C | 23.3 °C | 4 days | Pleasant — a good time to go |
| October | 17.6 °C | 18.9 °C | 6 days | Possible, with trade-offs |
| November | 12.6 °C | 14.8 °C | 8 days | Possible, with trade-offs |
| December | 8.2 °C | 11 °C | 9 days | Unfavourable season |
Before you go
Three things to check once you have picked your dates.
Entry
Romania 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 Constanţa in September?
The sea averages 23.3°C in September — swimming is possible but brisk.
How hot is Constanţa in September?
Expect 23.3°C in the afternoon and 16.8°C at night, averaged over the last 10 years.
Does it rain a lot in Constanţa in September?
Around 4 days with rain (≥ 1 mm) in the month — 15% of days.