Finnish schools begin summer break with mixed weather, warming to above 20°C nationwide by week’s end

Unsettled conditions will mark the start of summer holidays for Finnish schoolchildren, with temperatures rising sharply by Thursday, public broadcaster Yle reports.

Meteorologist Henriikka Heikinoja of Yle described early-week weather as “moderate” in central and northern regions, with scattered showers and thunderstorms, while southern Finland sees temperatures near 20°C. A broader warm-up is expected midweek, pushing thermometers above 20°C across the country by Thursday—including in the far north.

Overnight lows between Sunday and Monday dipped below freezing at some northern monitoring stations, with Savukoski’s Tulppio recording –2.4°C and Inari’s Saariselkä –0.1°C. “These readings aren’t unusual for early June at these locations,” Heikinoja noted, adding that daytime temperatures had already climbed back above zero.

Water temperatures remain cool, according to the Finnish Environment Institute. While most lakes hover above 10°C, Närpiö’s Hinjärvi leads at 16.6°C, followed by Tuusulanjärvi at 15.8°C. The coldest readings were in Kevojärvi (7.6°C) and the Oulankajoki river (10.7°C). “Many waters are still quite chilly, though smaller lakes may reach 15°C or higher,” Heikinoja said.

Long-range forecasts remain uncertain. “This spring has seen sudden shifts even in 24-hour outlooks,” the meteorologist cautioned. “Under stable conditions, a five-day temperature forecast is about the most reliable we can offer.”