Helsinki in August
In August, Helsinki averages 20°C (68°F) during the day and 13°C (55°F) at night, with around 13 days of rain (80 mm total).
Peak seasonConditions are comfortable for sightseeing without being sweltering. Plan for unsettled weather and bring rain gear.
August offers comfortable temperatures in Helsinki, with some rain to plan around.
How August compares to the rest of the year in Helsinki
August is one of the warmest months in Helsinki (2nd of 12) and moderately rainy compared to the rest of the year (6th of 12). Daytime temperature runs 11°C above the annual average (9°C). August runs 2°C cooler than July (22°C) and cools 5°C in September (15°C).
August sunrise & sunset in Helsinki
Times shown for Helsinki local time (Europe/Helsinki), calculated for the 15th of August. They shift by a few minutes day to day across the month.
Photography light in Helsinki — August
Golden-hour and blue-hour windows for the 15th of August, in Helsinki's local time. Use these for soft warm light (golden) or cool architectural twilight (blue).
📅 When to book — Helsinki in August
Travel writers usually only tell you when to go. Here's when to book flights and lodging for the best mix of price and availability, based on August's tier (Peak season) and Helsinki's popularity.
Crowds & pricing — August in Helsinki
Helsinki is in peak season during this month — expect bigger crowds at famous sights, higher hotel and flight prices, and longer queues. Restaurant reservations a few days out are advisable, and any boutique hotels you have your eye on should be booked weeks ahead. The trade-off: most attractions, restaurants, and seasonal services are fully open, the weather is at its most reliable, and the city feels at its most alive.
Why this tier: excellent tourism weather Northern Hemisphere summer holidays
Sun & mosquito risk — August in Helsinki
UV is a clear-sky sea-level estimate — clouds, altitude, and reflective surfaces (snow, water) shift it ±30%. Mosquito risk is climate-derived only; for current disease advisories (dengue, malaria, zika) check the CDC or WHO travel pages before your trip.
Sea temperature in Helsinki — August
Across the year Helsinki's sea swings from -0.2°C (January) to 19.4°C (August) — August sits at 19.4°C.
Helsinki in other months
| Month | Avg high | Avg low | Rainfall | Rain days | Snow days |
|---|---|---|---|---|---|
| January | -3°C / 27°F | -7°C / 19°F | 55 mm | 17 | 11 |
| February | -3°C / 27°F | -8°C / 18°F | 40 mm | 15 | 11 |
| March | 1°C / 34°F | -5°C / 23°F | 40 mm | 12 | 7 |
| April | 8°C / 46°F | 0°C / 32°F | 35 mm | 11 | 2 |
| May | 15°C / 59°F | 5°C / 41°F | 40 mm | 11 | 0 |
| June | 19°C / 66°F | 11°C / 52°F | 55 mm | 12 | 0 |
| July | 22°C / 72°F | 14°C / 57°F | 75 mm | 12 | 0 |
| August | 20°C / 68°F | 13°C / 55°F | 80 mm | 13 | 0 |
| September | 15°C / 59°F | 8°C / 46°F | 70 mm | 13 | 0 |
| October | 8°C / 46°F | 3°C / 37°F | 80 mm | 15 | 0 |
| November | 3°C / 37°F | -1°C / 30°F | 70 mm | 16 | 5 |
| December | -1°C / 30°F | -5°C / 23°F | 55 mm | 17 | 9 |
Other cities with similar August weather
🌍 See the full ranked list of climate twins for Helsinki in August →
Frequently asked questions
How hot is Helsinki in August?
In August, Helsinki averages a high of 20°C (68°F) and a low of 13°C (55°F) — generally mild and pleasant.
Does it rain a lot in Helsinki in August?
August can be fairly wet in Helsinki, with about 13 rainy days on average.
Is August a good time to visit Helsinki?
August is mild and pleasant. It suits travelers who are comfortable with mild and pleasant weather; check the month-by-month ranking to compare it against the rest of the year.
What should I pack for Helsinki in August?
Pack light layers for warm days and cooler evenings, plus a compact umbrella or rain jacket. See the full August packing list for Helsinki for a complete, climate-based checklist.
Check the live 10-day forecast and sunrise/sunset.