Helsinki Weather in August

August is one of the excellent months to visit Helsinki, 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 79 mm (3.1 in).

Rainfall in Helsinki in August

Expect around 16 days of rain based on historical data, with 79 mm (3.1 in) average. The rainfall pattern this month is fairly balanced. Showers tend to be moderate rather than extreme.

Temperature in Helsinki in August

Weather in Helsinki is at its excellent in August. Highs reach 22°C (72°F), while nights settle around 12°C (54°F). During August, you'll experience the summer season. Even when the weather is stable, mornings and evenings can still feel distinctly cool. 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 Helsinki in August

The month enjoys around 230 hours of sunshine, creating mostly sunny days with good weather conditions.

Wind Speed in Helsinki in August

August has wind speeds averaging 3 m/s (6 knots). You can expect comfortable light winds that steadily move flags and feel mild throughout the day. Since this is an average, daily conditions vary from gentle winds to more active breezes.

Average water temperature in August

The water is 15°C (59°F) this month — cool enough to feel refreshing on a warm day, but cold enough that most people won't stay in for long without a wetsuit.

If your ideal day consists of dry skies and pleasant temperatures, June, July and August typically offer the best circumstances for Helsinki.

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For a detailed overview over the year and the best time to visit Finland, check out our Helsinki's climate page.

Helsinki Temperature in August

Min Temperature 12°C (54°F)  

Max Temperature 22°C (72°F)  

Water Temperature 15°C (59°F)  

Chance of Rain 52%  

Precipitation 79 mm (3.1 in)  

Rainy days 16 days  

Humidity 78%  

Windspeed 3 m/s (6 knots)  

Sunshine 230 hours  

Percentage Sunshine  

Daily Historical Temperatures

50-year average (1976-2025)

Based on our historical records, temperatures in Helsinki 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 13°C (55°F).

Average temperatures in August

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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

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Historical weather for Helsinki in August

Browse day-by-day weather records for Helsinki spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.

Historical weather Temperatures Precipitation

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Helsinki historical weather extremes in August

The extremes listed below come from historical weather data collected in Helsinki from 1976 through 2025.

• The hottest August day on record in Helsinki reached 31°C (88°F) (August 7, 2010).
• On August 25, 1981, Helsinki saw its coldest August day with temperatures maxing out at 11°C (52°F).
• The coldest night in August in Helsinki was on August 15, 1978, with a minimum of 1°C (34°F).

What to Wear in Helsinki in August

Pleasant temperatures in August mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Rain gear is recommended, you can expect wet weather on multiple days. The water temperature sits at about 15°C (59°F), which is too chilly for most people to enjoy swimming. Leave the swimsuit at home unless you love cold water. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.

What To Do in Helsinki in August

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Cycling

9/10

Walking

9/10

Barbeque

8/10

Camping

8/10

Outdoor sports

9/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Finland, check out our Helsinki's climate page.

More climate data for Helsinki

Temperature Rainfall Sunshine Humidity Wind Speed Water Temp

See the full Helsinki climate overview or explore weather in Finland.