Helsinki vs Tallinn

Helsinki and Tallinn are closely matched in September. Neither city has a clear advantage across all metrics. Your decision should come down to personal preference, cultural interests, and travel logistics rather than weather alone.

Helsinki sits in the comfortable travel range at 15°C. Tallinn is also comfortable at 15°C.

For travelers who prioritize dry weather, Helsinki is the stronger choice in September. Tallinn receives 1 more hour of sunshine per day, which matters for sightseeing and outdoor activities.

Helsinki reaches an average high of 15°C (59°F) and drops to 10°C (50°F) at night during September. The daily temperature range is 5°C, meaning relatively stable temperatures from day to night.

Tallinn averages 15°C (59°F) for the high and 10°C (50°F) for the low, with a daily range of 5°C. The two cities feel quite similar in terms of temperature.

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

Helsinki receives approximately 58 mm of rainfall across 10 rain days during September. You can expect rain roughly every other day.

Tallinn sees 59 mm over 12 rain days. That makes Helsinki the drier option by 2 rain days and 1 mm of total precipitation.

Both cities share similar humidity levels at 65%.