Tallinn vs Helsinki

Tallinn and Helsinki 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.

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

Tallinn 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.

Helsinki 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.

Tallinn receives approximately 59 mm of rainfall across 12 rain days during September. You can expect rain roughly every other day.

Helsinki sees 58 mm over 10 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%.