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May in Oulu averages a daily high of 11°C with nights around 4.5°C. Generally workable, with some weather to plan around.
Across the year, the best time to visit Oulu is July–August.
Based on OULU VIHREASAARI, FI (3.4km), 1995–2024. 28 years of May data.
See all twelve months for Oulu →