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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.
Naantali Weather in August
August in Naantali brings pleasant temperatures, with daytime highs of 21°C (70°F) and nights around 12°C (54°F). It's also the wettest month of the year, so an umbrella is a must.
Rainfall in Naantali in August
With the most rainfall occurring this month, it's practical to keep an umbrella handy for sudden downpours. You can expect rain on roughly 15 days based on historical data, averaging 81 mm (3.2 in) for the month. Expect a fairly normal spread of rainfall this month, with no particular pattern of very heavy or very persistent showers.
Temperature in Naantali in August
Naantali in August has excellent weather. Days reach 21°C (70°F) and nights cool to 12°C (54°F). During August, the summer season is in full swing. Temperatures can feel cooler in the morning and evening, so layering is often the best approach. Nights drop to around 12°C (54°F), which is noticeably cooler than the daytime. A light jacket for the evening is a sensible addition, and the cool nights tend to make sleeping comfortable.
Sunshine in Naantali in August
The month enjoys around 228 hours of sunshine, creating mostly sunny days with good weather conditions.If you're a fan of comfortable temperatures and drier conditions, August is a great time to visit.
Naantali Temperature in August
Min Temperature
12°C (54°F)
Max Temperature
21°C (70°F)
Chance of Rain
51%
Precipitation
81 mm (3.2 in)
Rainy days
15 days
Sunshine
228 hours *
Percentage Sunshine
*
* Data from: Turku, Finland (13 KM, 8 Miles).
Naantali Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Naantali - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Naantali 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
Historical weather records for Naantali in August
Browse day-by-day weather records for Naantali spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Naantali historical weather extremes in August
Based on weather observations in Naantali between 1976 and 2026, these are the recorded extremes during August.
- On August 4, 2014, temperatures climbed to 31°C (88°F), marking the warmest August day on record.
- The lowest daytime temperature in August was 10°C (50°F), recorded on August 28, 1981.
- Nighttime temperatures dropped to 1°C (34°F) on August 26, 1984, marking the coldest August night on record.
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 Naantali in August
For Naantali in August, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. High rain levels are expected, so pack waterproof gear and an umbrella or poncho. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.
What To Do in Naantali 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
Naantali 3-Day Forecast
More climate data for Naantali
See the full Naantali climate overview or explore weather in Finland.
Popular in August
Where to go in August - average daytime high across popular destinations.
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