Gdansk, where it's located

The climate of Gdansk is Baltic, that is to say, relatively continental, with cold winters and mild summers.
The city is located in northern Poland, on the Baltic Sea coast.
The average temperature of the coldest month (January) is of -1.2 °C (30 °F), that of the warmest month (July) is of 17.9 °C (64 °F). Here are the average temperatures.
Gdansk - Average temperatures
Min (°C)-4-3-1381114131061-2
Max (°C)1261117202222181362
Min (°F)252730374652575550433428
Max (°F)343643526368727264554336

Precipitation amounts to 570 millimeters (22.4 inches) per year: so, it is at an intermediate level. It ranges from 25 mm (1 in) in the driest month (February) to 70 mm (2.8 in) in the wettest ones (June, July, August). Here is the average precipitation.
Gdansk - Average precipitation

On average, there are around 1,730 sunshine hours per year. Here are the average sunshine hours per day.
Gdansk - Sunshine

The sea temperature ranges between 3 °C and 18 °C (37 and 64 °F); so, it never becomes warm for swimming. Here are the average sea temperatures.
Gdansk - Sea temperature
Temp (°C)43348131618151296
Temp (°F)393737394655616459544843


Best Time

The best time to visit Gdansk runs from mid-May to mid-September, since it is the warmest and sunniest period of the year. Sometimes, it can be hot in July and August, while in other circumstances, nights can be cool or even a little cold even in these months, so it can be useful to bring a sweatshirt or sweater and a light jacket for the evening.