Daylight in Turku

At 60.45°N where the Aura river meets the Archipelago Sea, Turku sits far enough south that the sun rises and sets every day of the year, with neither midnight sun nor polar night. Because Turku lies 2.67 degrees of longitude west of Helsinki inside the same Eastern European Time zone, its solar noon and daily transitions occur roughly eleven minutes later on the clock than in the capital. On the summer solstice, 21 June, the sun rises at 04:01 and sets at 23:04 for 19h 04m of daylight, bathing the oak groves of Ruissalo and the riverboats along Aurajoki in pale amber twilight right past midnight. On 21 December, sunrise waits until 09:37 and sunset comes at 15:20, leaving 5h 44m of daylight.

Nights in Turku reach true astronomical darkness from 22 August until 19 April. Between 20 April and 21 August the sun never drops below the 18° threshold required for an unlit night sky. At the December solstice the city gets 12h 38m of astronomical darkness, only two minutes more than Helsinki. Seeing the northern lights from Varsinais-Suomi requires both a strong southward expansion of the auroral oval and a clear northern horizon away from the port floodlights at Linnansatama; locals drive out past Raisio or walk the dark shoreline meadows of Ruissalo and Hirvensalo facing north across the water.

Two local habits shape how people use Turku's daylight. First, the south-western archipelago enjoys the mildest autumns in mainland Finland, which often means bare, dark soil around Turku Cathedral and Luostarinmäki well into December before lasting snow brightens the streets. Second, cyclists and Föli water-bus commuters heading along the Aura riverbanks towards Kakolanmäki rely on the funicular and well-lit riverside paths once afternoon dusk settles around half past three in midwinter, scheduling archipelago island hops along the Korppoo and Nauvo cable-ferry ring for the bright hours around midday.

Sampled on the 1st of each month and on the four turning points, in 2026. Times are Turku local time and include the summer-time change, on the last Sunday of March and of October.

The last column is the one that matters for the northern lights: the sun more than 18° below the horizon. It is always shorter than the night, and in midsummer it is zero for weeks at a time even where the sun still sets.