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May in Porvoo averages a daily high of 12.9°C with nights around 6.6°C. Generally workable, with some weather to plan around.
Across the year, the best time to visit Porvoo is June–August.
Based on PORVOO EMASALO, FI (21.1km), 1995–2024. 25 years of May data.
See all twelve months for Porvoo →