Gdańsk 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
Good
Best time to visit: May – September
What is the weather like in Gdańsk in September?
In September, Gdańsk is mild: daytime highs average 18 °C, and nights cool down to about 12 °C. The sea averages 16.9 °C – swimming is only for the hardy. Expect around 6 hours of sunshine a day. Rain is frequent, with about 9 rainy days and 52 mm in total. All in all, September is a good month for a holiday in Gdańsk.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 79 | 78 | 38 |
| Day | 23° | 18° | 13° |
| Night | 15° | 12° | 7° |
| Sea | 19° | 17° | 13° |
| Sun | 7 h | 6 h | 4 h |
| Rain days | 11 | 9 | 12 |
More details for September
- Daylight
- 12 h 49 min06:16 – 19:05
- UV index
- 3 · moderateclear sky, noon (estimate)
- Muggy days
- 0 daysdew point 18 °C or more
- Wind
- 21 km/haverage daily peak
- Cloud cover
- 60 %on average
- Hot days
- 0 days30 °C or more
- Snow days
- 0 days1 cm or more of fresh snow
- Time zone
- UTC+2Europe/Warsaw
How the score comes together
- Temperatureweight 50 %100 %
- Sunshineweight 20 %48 %
- Few rainy daysweight 30 %61 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in September
- Wetsuit for longer swims
- Sunscreen
- A jumper for the evenings
- Rain jacket or umbrella
Gdańsk in September: quick answers
Is Gdańsk hot in September?
No. In September, Gdańsk is mild: daytime highs average 18 °C and nights drop to about 12 °C.
Can you swim in Gdańsk in September?
Only if you don't mind cold water: in September the sea averages just 16.9 °C. Comfortable swimming temperatures are not reached at any time of year.
Does it rain much in Gdańsk in September?
Rain is frequent, with about 9 rainy days and 52 mm in total.
Gdańsk month by month
The whole year in GdańskAll destinations: Poland
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, GeoNames (CC BY 4.0)