Monthly climate guide
Gdańsk weather in September
Expect mild weather in Gdańsk in September: afternoons reach about 18°C (64°F), while nights drop to around 13°C (55°F). Around 64 mm of rain falls over the month (some rain), and skies are often cloudy. Daytime highs are 4°C cooler than August and 6°C warmer than October.
What stands out in September
- Just 140 km apart, but Gdańsk runs about 2°C cooler than Bydgoszcz this month.
- Comfortable temperatures make it easy to walk between Long Market (Długi Targ) and St Mary's Church.
- Seasonally, September counts as early autumn in Gdańsk.
- It cools down fast from here: October is about 5°C cooler.
Avg high
18°C
64°F
Avg low
13°C
55°F
Rainfall
64 mm
some rain
Humidity
79%
relative
Sky
65%
cloud · often cloudy
Gdańsk weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 1°C / 34°F | -2°C / 29°F | 62 mm | 91% | 92% |
| February | 2°C / 35°F | -2°C / 29°F | 41 mm | 90% | 86% |
| March | 5°C / 41°F | 0°C / 33°F | 38 mm | 85% | 80% |
| April | 10°C / 50°F | 4°C / 39°F | 36 mm | 82% | 65% |
| May | 15°C / 58°F | 8°C / 47°F | 48 mm | 80% | 58% |
| June | 19°C / 66°F | 13°C / 55°F | 58 mm | 78% | 60% |
| July | 21°C / 69°F | 15°C / 60°F | 94 mm | 79% | 66% |
| August | 22°C / 71°F | 16°C / 60°F | 59 mm | 76% | 62% |
| September | 18°C / 64°F | 13°C / 55°F | 64 mm | 79% | 65% |
| October | 13°C / 55°F | 8°C / 46°F | 65 mm | 84% | 75% |
| November | 7°C / 45°F | 4°C / 39°F | 62 mm | 91% | 85% |
| December | 4°C / 38°F | 1°C / 34°F | 66 mm | 91% | 88% |
What to pack for September
- A warm sweater or fleece for layering
- A mid-weight jacket
- A small travel umbrella, just in case
Is September a good time to visit Gdańsk?
Our Gdańsk guide recommends: June to August for the warmest weather and beach days; May and September are quieter and still pleasant.
Walk along the Motława riverside in the evening, when the old granaries and the medieval crane are lit up.
Best time to visit Gdańsk →Other Poland cities in September
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Gdańsk weather in September. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/poland/gdansk/september
<a href="https://weathercompare.eu/weather/poland/gdansk/september">Gdańsk weather in September</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/poland/gdansk" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Gdańsk weather in September"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/poland/gdansk/september">Gdańsk weather in September</a> – WeatherCompare</p>
Gdańsk in September: quick answers
Is September a good time to visit Gdańsk?
Yes. September is one of the best months for Gdańsk, with highs around 18°C and about 64 mm of rain.
How warm is Gdańsk in September?
Average highs are about 18°C (64°F) and average lows about 13°C (55°F), based on 10 years of daily data.
Does it rain a lot in Gdańsk in September?
Gdańsk typically gets around 64 mm of rain in September — some rain.
When is the best time to visit Gdańsk?
June to August for the warmest weather and beach days; May and September are quieter and still pleasant.
Figures are long-term averages for the area around Gdańsk (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.