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 August
August is one of the excellent months to visit Porvoo, with daytime temperatures of 22°C (72°F) and lows of 12°C (54°F) at night. Do note that quite a bit of rainfall is typical, averaging around 70 mm (2.8 in).
Rainfall in Porvoo in August
Typically, you can expect about 15 days of rain this month, with 70 mm (2.8 in) on average. Rain falls on many days this month, but usually in relatively small amounts. A light waterproof is more useful than a heavy umbrella.
Temperature in Porvoo in August
Porvoo in August has excellent weather. Days reach 22°C (72°F) and nights cool to 12°C (54°F). This month falls in the summer season. Even when the weather is stable, mornings and evenings can still feel distinctly cool. Nights cool down to 12°C (54°F), so a light jacket or extra layer is useful once the sun goes down. On the plus side, the cooler nights make for comfortable sleeping conditions.
Sunshine in Porvoo in August
Expect a lot of sunshine this month, with about 230 hours of sun. These sunny conditions add to the overall experience.Our weather planner can help you find worldwide destinations with pleasant weather during this period. June, July and August typically offer the best weather for Porvoo.
Porvoo Temperature in August
Min Temperature
12°C (54°F)
Max Temperature
22°C (72°F)
Chance of Rain
51%
Precipitation
70 mm (2.8 in)
Rainy days
15 days
Humidity
78% *
Sunshine
230 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 drop from around 22°C (72°F) at the start of August to approximately 18°C (64°F) by the end. Nights are cool, with lows typically ranging from 10°C (50°F) to 14°C (57°F).
Average temperatures in August
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 August
Historical weather records for Porvoo in August
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 August
Based on 50 years of weather observations (1976-2026), these are the most extreme conditions recorded in Porvoo.
- On August 8, 2010, temperatures climbed to 31°C (88°F), marking the warmest August day on record.
- The coldest August day was on August 28, 1986, with a maximum of 11°C (52°F).
- The lowest overnight temperature recorded in August was 2°C (36°F) (August 15, 1978).
Best Places in Finland in August
Find out more about the weather in Finland and which places have the best travel conditions in this month. See all of Finland in August →
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 August
Comfortable temperatures call for an easy wardrobe in August. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. Wet weather is likely, so pack waterproof gear for multiple rainy days. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.
What To Do in Porvoo in August
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Cycling9/10 -
Walking9/10 -
Barbeque8/10 -
Camping8/10 -
Outdoor sports9/10
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 August
Where to go in August - average daytime high across popular destinations.
Bucket list
Need travel inspiration? Check out our bucket list articles and be inspired.
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