Gdańsk Weather in September
September in Gdańsk brings pleasant temperatures around 19°C (66°F) during the day, dropping to 11°C (52°F) at night, with quite a bit of rainfall expected, averaging around 64 mm (2.5 in) for the month.
Rainfall in Gdańsk in September
Typically, about 15 days will experience rainfall, with an average of 64 mm (2.5 in) for the month. Rain is frequent but mostly light this month, with brief showers more common than heavy downpours.
Temperature in Gdańsk in September
In September, Gdańsk gets pleasant temperatures, with highs of 19°C (66°F). Nights cool to around 11°C (52°F). A light jacket or extra layer can be useful, especially outside the warmest hours of the day. Nights cool down to 11°C (52°F), so a light jacket or extra layer is useful once the sun goes down. On the plus side, the cooler nights make for comfortable sleeping conditions.
Sunshine in Gdańsk in September
You can expect a moderate amount of sunlight, with approximately 173 hours. This means a pleasant mix of sun and overcast.
Wind Speed in Gdańsk in September
Wind speeds average 3 m/s (6 knots) during September. At this speed, light breezes keep leaves and small twigs in gentle motion while the wind also provides natural cooling. Since this is an average, some days are more tranquil while others have more persistent light winds that are more noticeable.
Average water temperature in September
The water is 13°C (55°F) this month — cool enough to feel refreshing on a warm day, but cold enough that most people won't stay in for long without a wetsuit.If you prefer dry days with pleasant temperatures, June, July and August typically offer the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Poland, check out our Gdańsk's climate page.
Gdańsk Temperature in September
Min Temperature
11°C (52°F)
Max Temperature
19°C (66°F)
Water Temperature
13°C (55°F)
Chance of Rain
50%
Precipitation
64 mm (2.5 in)
Rainy days
15 days
Humidity
81%
Windspeed
3 m/s (6 knots)
Sunshine
173 hours
Percentage Sunshine
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Gdańsk typically drop from around 19°C (66°F) at the start of September to approximately 15°C (59°F) by the end. Nights are cool, with lows typically ranging from 7°C (45°F) to 11°C (52°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Gdańsk in September
Browse day-by-day weather records for Gdańsk spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Gdańsk historical weather extremes in September
Based on 49 years of weather observations in Gdańsk between 1976 and 2025, these are the recorded extremes.
- Gdańsk recorded its highest September temperature of 29°C (84°F) on September 21, 2018.
- On September 30, 1993, Gdańsk saw its coldest September day with temperatures maxing out at 8°C (46°F).
- Gdańsk registered its coldest September night on September 27, 1986, with temperatures dropping to -2°C (28°F).
Best Places in Poland in September
Find out more about the weather in Poland and which places have the best travel conditions in this month. See all of Poland in September →
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What to Wear in Gdańsk in September
For Gdańsk in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. Rain is likely on several days, so bring a good rain jacket. With water temperatures around 13°C (55°F), the water is quite cold for swimming. You can skip the swimwear unless you're particularly tough. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.What To Do in Gdańsk in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Poland, check out our Gdańsk's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed Water Temp
See the full Gdańsk climate overview or explore weather in Poland.
