Weather: Helsinki — May

May is typically excellent for visiting Helsinki, with average highs of 15°C and around 9 rainy days. Plan your activities accordingly—outdoor sightseeing is best on dry days, while rainy days are perfect for museums and indoor attractions.

Nights in Helsinki during May are cool at around 6°C. Bring a jacket or sweater for evenings, especially if you plan to dine outdoors or take evening walks. The temperature drop from day to night can be noticeable.

With highs of 15°C and lows of 6°C in May, we recommend: Layerable clothing, Light jacket, Compact umbrella, Comfortable walking shoes. Layering is key as temperatures can vary between air-conditioned interiors and outdoors. Comfortable walking shoes are essential for cobblestone streets.

Helsinki typically sees around 9 rainy days in May. Rain is usually in the form of brief showers rather than all-day downpours, so a compact umbrella is sufficient. Mornings tend to be drier, making them ideal for outdoor sightseeing.

Swimming in Helsinki during May is possible but quite cold, with air temperatures around 15°C. Only brave swimmers venture in without a wetsuit. Consider indoor pools or thermal baths as an alternative if your hotel offers them.

In May, Helsinki gets approximately 17.2 hours of daylight per day. This affects how much sightseeing you can fit in—longer days mean more time for outdoor activities, while shorter days are perfect for cozy museum visits and early dinners.

Yes, May is peak season in Helsinki. Expect higher prices for accommodation and more crowds at popular attractions, but also the best weather conditions. Book hotels and major attractions in advance to secure availability and better rates.