Gdańsk (Danzig) weather in September

Regulars are consistent that this coastal city's weather stays changeable this month specifically because of gusts coming off the sea, chilly enough in the mornings and evenings that a sweater or light jacket is standard advice even when the afternoon itself turns pleasant. Our row backs the mild-but-breezy read, 19.8C over 10.4C nights, with 49.5mm of rain across 8.5 days and a real 20 kph wind. Multiple regulars who've returned across several Septembers describe the month as reliably fine overall despite the day-to-day variability, making it a solid choice for both Gdansk and nearby Sopot. The sea holds 19.8C. The record: humidity 76 percent, 8.8 hours of sun and AQI 43.

Regulars name this among the loveliest months to visit, mild weather and noticeably thinner crowds than deep summer, though they're consistent that a small umbrella or light waterproof jacket belongs in the bag regardless of how promising the forecast looks. Our row backs that mild, genuinely showery read, 17.6C over 6.7C nights feeling 4C, with 52.7mm of rain across 10.8 days and a trace of very late snow, 0.1cm, matching regulars' sense that a cold snap can still sneak in this early. Regulars are consistent t-shirts and light layers cover most days, a light jacket worth keeping on hand for cooler evenings along the waterfront. The sea sits at a cold 10.4C, still far too cool for a swim this early in the season. The record: humidity 70 percent, 12 hours of sun, a 20.1 kph wind and AQI 47.

Regulars call July the best month here and refuse to promise it: the Polish seaside runs hot as Italy in some years and cold and wet in others, and one visitor's 20C week was perfectly good for walking the city and the sand without being a beach holiday. Our row is the middling version at 22.9C over 13.5C, with 99.9mm across 14.8 days and a 20.1C sea. What is certain is the crowd - July and August are the Baltic high season and the Gdansk-Sopot-Gdynia strand fills - so they name the quieter sands, Sobieszewo and Jelitkowo, for anyone who wants space. The light is the other gain at 16.6 hours. The record: humidity 75 percent, 12 hours of sun and AQI 45.

The first part of August is the hot half in Gdansk - regulars report 30C and above - and the whole month is unpredictable enough that the standing advice is to carry an umbrella and a light jacket whatever the forecast says. Our row averages 23.8C over 13.8C with 71.8mm across 11.4 precipitation days. The Baltic is the payoff and it is a late one: the water turns relatively warm around mid-August, which our row puts at 20.8C, so the beaches at Stogi, Brzezno and Jelitkowo and the run down to Sopot are worth the tram ride in the second half of the month rather than the first. The record: 11 hours of sun and AQI 43.

Gdansk forum threads describe January as cold with real variability from year to year - some visitors reported plenty of snow and genuinely icy conditions well below freezing, while other years brought a milder, largely snow-free stretch instead. A recurring theme: bitter wind off the Baltic, especially in nearby Gdynia, was flagged as making the cold feel considerably sharper than the raw temperature. Posters called January genuinely low season here, with short days and thinner crowds than the warmer months. The standard advice was warm layers plus a fleece kept handy in case an unexpectedly mild spell shows up, and posters noted public transport generally keeps running smoothly even when melting snow leaves streets slushy.