Constanța weather in September
Temperature, sea and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Excellent
Best time to visit: May – September
What is the weather like in Constanța in September?
In September, Constanța is warm: daytime highs average 23 °C, and nights cool down to about 16 °C. The sea averages 22.2 °C – refreshing for a swim. The sun shines for around 8 hours a day. Rain falls on about 6 days, adding up to 51 mm. All in all, September is an excellent month for a holiday in Constanța.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 94 | 91 | 77 |
| Day | 28° | 23° | 17° |
| Night | 20° | 16° | 11° |
| Sea | 25° | 22° | 18° |
| Sun | 10 h | 8 h | 5 h |
| Rain days | 5 | 6 | 6 |
More details for September
- Daylight
- 12 h 35 min06:43 – 19:18
- UV index
- 5 · moderateclear sky, noon (estimate)All months
- Muggy days
- 2 daysdew point 18 °C or moreAll months
- Wind
- 19 km/haverage daily peakAll months
- Cloud cover
- 45 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Snow days
- 0 days1 cm or more of fresh snowAll months
- Time zone
- UTC+3Europe/Bucharest
How the score comes together
- Temperatureweight 50 %100 %
- Sunshineweight 20 %77 %
- Few rainy daysweight 30 %86 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in September
- Swimwear
- Sunscreen
- A jumper for the evenings
Constanța in September: quick answers
Is Constanța hot in September?
Warm rather than hot: in September, daytime highs in Constanța average 23 °C and nights cool to about 16 °C.
Can you swim in Constanța in September?
Yes. In September the sea averages 22.2 °C – refreshing for a swim.
Does it rain much in Constanța in September?
Rain falls on about 6 days, adding up to 51 mm.
Constanța month by month
The whole year in ConstanțaAll destinations: RomaniaWhere to go in SeptemberSea temperature in September
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences