Turku, Finland's oldest city, sits on the southwest coast at the mouth of the Aura River, facing the Baltic Sea and its vast archipelago, at approximately 60.45°N, 22.27°E. Its coastal, southwestern position gives it a humid continental climate (Köppen Dfb) moderated by the Baltic — with mild summers and cold, snowy winters, milder than inland Finland — and it is the sunniest city in the country.

Summer, from June to August, is mild and short, with July the warmest month — average highs around 22–23°C and cool nights — though warm spells can occasionally reach 30°C. Turku is the sunniest place in Finland, with around 288 hours of sunshine in July, and the season brings the long luminous northern evenings, when the archipelago comes alive with ferries, cycling and island-hopping.

Winter, from December to March, is cold and snowy but milder than inland Finland, thanks to the relatively open Baltic waters that freeze less readily than the northern gulfs. Highs hover near or just below freezing, and lows typically fall to around -7 to -9°C, with cold snaps that can plunge well below -20°C. Snow covers the ground for around three to four months, and daylight is very short.

Turku receives around 700 mm of precipitation a year — among the higher totals in Finland — spread through the year with a late-summer and autumn maximum, while late winter and spring are the driest; much of the cold-season total falls as snow. Live rainfall, humidity, and pressure readings for the city are shown in the panels above.

Turku's position on the southwestern tip of Finland, sheltered among the islands of its great archipelago, gives it the mildest winters and the most sunshine in the country — the surrounding Baltic waters are slower to freeze than the Gulf of Bothnia further north. The vast seasonal swing in daylight, from luminous white nights to dark winter afternoons, remains the defining rhythm of the year.

To follow any single measurement in Turku 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.