Gdańsk, Poland's principal port, sits on the Baltic coast at the mouth of the Vistula in the north of the country, at approximately 54.35°N, 18.65°E. Its coastal position gives it a humid continental climate (Köppen Dfb) moderated by the Baltic — with mild summers and cold, snowy winters, milder and windier than inland Poland.

Summer, from June to August, is mild rather than hot, with July and August the warmest — average highs around 22–23°C — kept cool by Baltic breezes, though warm spells can reach 30°C. It is the wettest season for showers and thunderstorms, but also the sunniest and most agreeable, with long northern daylight drawing crowds to the Baltic beaches.

Winter, from December to February, is cold and grey, with January and February the coldest — average highs around 1–2°C and lows near -3 to -4°C, milder than inland Poland thanks to the sea. Snow falls and can lie for weeks, cold snaps can drop below -15°C, and Baltic storms bring wind and rain to the coast.

Gdańsk receives around 600–650 mm of precipitation a year, spread through the year with a summer maximum from thunderstorms; a good share of the cold-season total falls as snow. Autumn and winter storms off the Baltic are a hallmark of the season. Live rainfall, humidity, and pressure readings for the city are shown in the panels above.

Gdańsk's Baltic position moderates its climate relative to inland Poland, giving milder winters and cooler summers, but leaves it exposed to the storms and storm surges that sweep the shallow sea. The Vistula delta behind the city lies partly below sea level, protected by dykes.

To follow any single measurement in Gdansk more closely, use our live instruments: the online barometer for atmospheric pressure, the thermometer for temperature, the hygrometer for humidity, the anemometer for wind speed, the wind vane for wind direction, and the rain gauge for rainfall.