Helsinki vs Tallinn

Based on sunshine hours, rain days, comfortable temperatures, and humidity levels, Tallinn edges ahead as the better destination in May. Tallinn offers 13 hours of daily sunshine with only 9 rain days, while Helsinki sees 13 sunshine hours and 9 rain days.

Helsinki is on the cooler side at 13°C, requiring warmer clothing. Tallinn is also comfortable at 15°C.

For travelers who prioritize dry weather, both cities are equally dry in May.

Helsinki reaches an average high of 13°C (55°F) and drops to 6°C (43°F) at night during May. The daily temperature range is 7°C, meaning relatively stable temperatures from day to night.

Tallinn averages 15°C (59°F) for the high and 6°C (43°F) for the low, with a daily range of 9°C. The 2°C difference is noticeable but not dramatic.

Both cities are in the Northern Hemisphere, so they share the same seasonal pattern in May.

Helsinki receives approximately 44 mm of rainfall across 9 rain days during May. You can expect rain roughly every other day.

Tallinn sees 42 mm over 9 rain days. Both cities are equally rainy this month.

Both cities share similar humidity levels at 65%.