Air Guitar World Championship Finland
This is something you might want to add to your bucket list. August is also the perfect time to visit Finland. The days are long and the temperature is amazing.
Porvoo Weather in May
Porvoo in May sees moderate temperatures, with highs around 16°C (61°F) and overnight lows of 6°C (43°F). Around 48 mm (1.9 in) of rainfall is typical, so a light rain jacket is a sensible addition to your bag.
Rainfall in Porvoo in May
Typically, you can expect about 10 days of rain this month, with 48 mm (1.9 in) on average. The rainfall pattern this month is fairly balanced. Showers tend to be moderate rather than extreme.
Temperature in Porvoo in May
In May, Porvoo gets moderate temperatures, with highs of 16°C (61°F). Nights cool to around 6°C (43°F). A light jacket or extra layer can be useful, especially outside the warmest hours of the day. With lows around 6°C (43°F), nights are cold. The upside is that cool, crisp nights are often the best for a deep sleep.
Sunshine in Porvoo in May
Expect a lot of sunshine this month, with about 275 hours of sun. These sunny conditions add to the overall experience.For Porvoo itself, June, July and August generally stand out with the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Porvoo Temperature in May
Min Temperature
6°C (43°F)
Max Temperature
16°C (61°F)
Chance of Rain
33%
Precipitation
48 mm (1.9 in)
Rainy days
10 days
Humidity
65% *
Sunshine
275 hours *
Percentage Sunshine
*
* Data from: Helsinki, Finland (39 KM, 24 Miles).
Porvoo Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Porvoo - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Porvoo typically rise from around 12°C (54°F) at the start of May to approximately 17°C (63°F) by the end. Nights are cold, with lows typically ranging from 2°C (36°F) to 8°C (46°F).
Average temperatures in May
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in May
Historical weather records for Porvoo in May
Browse day-by-day weather records for Porvoo spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Porvoo historical weather extremes in May
Based on 50 years of weather observations (1976-2026), these are the most extreme conditions recorded in Porvoo.
- On May 15, 2018, temperatures climbed to 29°C (84°F), marking the warmest May day on record.
- The lowest daytime temperature in May was 3°C (37°F), recorded on May 1, 1981.
- Porvoo registered its coldest May night on May 2, 1995, with temperatures dropping to -5°C (23°F).
- Peak precipitation in May occurred on May 26, 2021, when 32 mm (1.3 in) of precipitation was measured.
Best Places in Finland in May
Find out more about the weather in Finland and which places have the best travel conditions in this month. See all of Finland in May →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Porvoo in May
The weather can swing between comfortable and chilly in May, so flexibility is key. Pack a variety of tops, at least one warm layer, and both shorts and long pants. This gives you options no matter what the day brings. Wet weather is likely, so pack waterproof gear for multiple rainy days. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.
What To Do in Porvoo in May
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Cycling6/10 -
Walking6/10 -
Camping5/10 -
Outdoor sports10/10
Porvoo 3-Day Forecast
More climate data for Porvoo
Temperature Rainfall Sunshine Humidity
See the full Porvoo climate overview or explore weather in Finland.
Popular in May
Where to go in May - average daytime high across popular destinations.
Tampere
15°C (59°F) Helsinki
16°C (61°F) Turku16°C (61°F) Vuokatti
13°C (55°F) Rovaniemi12°C (54°F) Äkäslompolo11°C (52°F) Ruka10°C (50°F) Levi10°C (50°F) Bucket list
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