Weather in Gdansk in September 2025
Average weather
Average temperature in Gdansk in September
The expected average maximum temperature in September is +75°F with a maximum of +84°F and a minimum of +46°F.
The average maximum temperature goes up 19% by the end of the month, compared with the beginning of the month, from +64°F to +72°F.
Is Gdansk warm or cold in September?
Gdansk is typically mild in September.
Maximum temperatures go down compared to the previous month from +72°F to +64°F. The minimum temperature also goes down from +57°F to +50°F.
Pack a light jacket as it will be warm in the day and cool in the evenings.
Take a look at how September is compared to other months in Gdansk:
Water temperature in Gdansk in September
Water in Gdansk in September is Fresh. It varies from +58°F to +68°F, with an average of +63°F. This is almost similar to the air temperature, which averages +64°F.
The water temperature in September is one of the warmest of the entire year:
Can you swim in Gdansk in September?
Climate in Gdansk in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +72°F | +64°F | +55°F | ||||
| Min. temperature | ||||||
| +45°F | +34°F | +25°F | ||||
| Max. temperature | ||||||
| +97°F | +90°F | +81°F | ||||
| Rainfall | ||||||
| 74 mm | 53 mm | 42 mm | ||||
| Wind | ||||||
| 3 m/s | 3 m/s | 3 m/s | ||||
| Avg. water temperature | ||||||
| +66°F | +63°F | +56°F | ||||
| Humidity | ||||||
| 76% | 80% | 83% | ||||
| Air pressure | ||||||
| 1014 HPa | 1015 HPa | 1015 HPa | ||||
| Sunny days | ||||||
| 7 | 6 | 5 | ||||
| Cloudy days | ||||||
| 5 | 7 | 10 | ||||
| Rainy days | ||||||
| 17 | 16 | 15 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September weather is still as ok as in August. It’s getting colder in September. From +72°F in the day, the average maximum temperature lowers to +64°F. As September arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 74 mm to 53 mm. Humidity rises from 76% to 80%. The average wind speed doesn’t change much during September, staying around 3 m/s. The days becoming less sunny, going from 7 sunny days in August to 6 in September.
October brings much the same weather, it remains ok.
Wind
The average wind speed is 3 m/s getting up to 6 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Gdansk is gradually increasing during September, going from 5 m/s to 6 m/s over the course of the month.
Rain
How was the weather last September in Gdansk?
Climate Change Over the Years
The climate in Gdansk in September has not changed that much over the last 43 years.
The average temperature was the lowest in 1987 (+48°F) and the highest in 2023 (+57°F). The driest year was 2005 with only 378 mm of rainfall, and the wettest year was 2017 with 781 mm.
FAQ
Is September a good time to visit Gdansk?
Can you sunbathe in Gdansk in September?
Can you swim in Gdansk in September?
Is Gdansk rainy in September?
Is it sunny in Gdansk in September?
Other cities in Poland
Monthly weather in Gdansk
Source of the data
For this page, we’ve looked at the typical weather in Gdansk, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.