Porvoo weather in May
Temperature, sea and sunshine in May: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in May
Poor
Best time to visit: July
What is the weather like in Porvoo in May?
In May, Porvoo is cool: daytime highs average 14 °C, and nights cool down to about 6 °C. The sea averages 6.5 °C – swimming is only for the hardy. With around 9 hours of sunshine a day, there is plenty of sun. Rain is frequent, with about 10 rainy days and 47 mm in total. All in all, May is not an ideal month for a holiday in Porvoo.
May compared
How the weather changes from April to June. Tap a month to open it.
More details for May
- Daylight
- 17 h 10 min04:38 – 21:48
- UV index
- 5 · moderateclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 16 km/haverage daily peakAll months
- Cloud cover
- 57 %on averageAll months
- Hot days
- 0 days30 °C or more
- Snow days
- 0 days1 cm or more of fresh snowAll months
- Time zone
- UTC+3Europe/Helsinki
How the score comes together
- Temperatureweight 35 %0 %
- Seaweight 25 %0 %
- Sunshineweight 20 %100 %
- Few rainy daysweight 20 %59 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in May
- Sunscreen
- Sunglasses & sun hat
- A jumper for the evenings
- Rain jacket or umbrella
Porvoo in May: quick answers
Is Porvoo hot in May?
No. In May, Porvoo is cool: daytime highs average 14 °C and nights drop to about 6 °C.
Can you swim in Porvoo in May?
Only if you don't mind cold water: in May the sea averages just 6.5 °C. Comfortable swimming temperatures are not reached at any time of year.
Does it rain much in Porvoo in May?
Rain is frequent, with about 10 rainy days and 47 mm in total.
Porvoo month by month
The whole year in PorvooAll destinations: FinlandWhere to go in MaySea temperature in May
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences