Clothing for trip

Hi - I’m flying to Helsinki tomorrow and struggling with what to pack. The weather forecast looks a bit chilly but I’m wondering if it often feels warm / humid during the day. I want to be comfortable but stylish. I’m planning to bring sneakers (Reeboks and adidas) and doc marten boots for shoes but wondering if I should bring heeled boots or anything “fancier” for dinners. Thank you in advance!