Climate averages 1991–2020
Constanţa weather
in September.
A warm, moderately wet month: the 4th warmest and the wettest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Constanţa: daytime highs average 22.5°C and nights cool to about 15.6°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 51 mm of rain on roughly 6 days, which makes September a moderately wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 12 h 34 min on an average September day.
The nearest other city in this atlas is Varna (122 km away). In September its highs average 22.6°C, about as warm as Constanţa, with 48 mm of rain.
Among the 27 cities listed in Romania, Constanţa ranks joint 8th of 27 for the warmest September highs and 6th of 27 for the driest September (rainfall, lowest first). The mean September high of those 27 cities is 21.3°C; Constanţa is 1.2°C warmer than that mean.
From September to October, average highs fall by 5.5°C to 17.0°C, and monthly rainfall falls from 51 mm to 50 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Constanţa climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 4.8°C-0.7°C | -0.7°C | 44 | 7.3 | 9.39 h |
| February | 6.4°C0.0°C | 0.0°C | 33 | 6.2 | 10.410 h |
| March | 9.8°C2.8°C | 2.8°C | 41 | 7.8 | 11.912 h |
| April | 14.4°C6.9°C | 6.9°C | 33 | 6.9 | 13.413 h |
| May | 20.0°C12.4°C | 12.4°C | 36 | 6.9 | 14.715 h |
| June | 24.6°C17.3°C | 17.3°C | 39 | 6.8 | 15.415 h |
| July | 27.1°C19.6°C | 19.6°C | 30 | 4.8 | 15.115 h |
| August | 27.2°C19.8°C | 19.8°C | 31 | 4.8 | 14.014 h |
| September, selected | 22.5°C15.6°C | 15.6°C | 51 | 5.9 | 12.613 h |
| October | 17.0°C11.0°C | 11.0°C | 50 | 6.8 | 11.011 h |
| November | 11.5°C6.1°C | 6.1°C | 45 | 7.1 | 9.710 h |
| December | 6.4°C1.2°C | 1.2°C | 46 | 8.0 | 8.99 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Varna in SeptemberBulgaria · 122 kmHigh 22.6°C · Low 15.8°C · 48 mm rain
- Brăila in SeptemberRomania · 132 kmHigh 23.2°C · Low 14.1°C · 41 mm rain
- Galaţi in SeptemberRomania · 147 kmHigh 23.2°C · Low 14.1°C · 41 mm rain
- Shumen in SeptemberBulgaria · 171 kmHigh 22.5°C · Low 12.9°C · 50 mm rain
- Buzău in SeptemberRomania · 179 kmHigh 22.6°C · Low 12.9°C · 53 mm rain
- Bucharest in SeptemberRomania · 203 kmHigh 23.4°C · Low 13.6°C · 60 mm rain
- Burgas in SeptemberBulgaria · 209 kmHigh 23.5°C · Low 15.2°C · 50 mm rain
- Ruse in SeptemberBulgaria · 218 kmHigh 24.1°C · Low 14.5°C · 55 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Constanţa) is explained once on the Constanţa year overview and on the Sources, method and limits page.