Helsinki Weather
A month-by-month look at temperature, rainfall and what to pack in Helsinki. The annual average is 8°C high / 2°C low — hottest in July (summer peak) (21°C) and coldest in February (winter peak) (-10°C).
Helsinki Weather at a Glance
As of 2026A quick summary of Helsinki's year-round climate and the best time to visit.
- Annual average
- 8° / 2°
- Best time to visit
- June (summer + white nights), July (summer peak), May (spring — best month)
- Hottest month
- July (summer peak) (21°C)
- Coldest month
- February (winter peak) (-10°C)
- Wettest month
- August (summer + Helsinki Festival) (79mm)
- Driest month
- April (spring begins) (32mm)
As of 2026, Helsinki's weather averages 8°C high / 2°C low across the year, and the best time to visit for stable temperatures, rainfall and crowds is June (summer + white nights), July (summer peak), May (spring — best month). The hottest month is July (summer peak) (21°C), the coldest is February (winter peak) (-10°C), and the wettest is August (summer + Helsinki Festival) (79mm).
Best Time to Visit Helsinki
**June is white nights season** — sun barely sets (19h daylight, twilight 00:30-03:30). Midsummer Eve (3rd Friday-Saturday) is Finland's biggest holiday — many locals leave for summer cottages + many restaurants close. **Helsinki Pride** (last week) draws 100,000+. Magical + slightly empty city around Midsummer.
**July is Helsinki's summer peak** — warm enough for swimming (Baltic 17°C), all outdoor activities + festivals + 18-hour daylight. Hotel rates at year-peak. Many locals are at summer cottages outside the city — Helsinki feels more touristic + less local. Best for first-timers.
**May is one of Helsinki's two best months.** Weather perfect (13/5°C) + days long (16h daylight) + outdoor activities all open + Vappu celebration (May 1) is Helsinki's biggest spring day with parties at Esplanade Park + Senate Square. Hotel rates moderate.
Helsinki Weather Month by Month
Tap any month for a detailed guide with what to wear, sunrise/sunset and air quality.
| Month | High/Low | Rain | Rainy days | Crowds | |
|---|---|---|---|---|---|
| January (deep winter + polar darkness) | -3° / -9° | 53mm | 11 | Quiet | Details → |
| February (winter peak) | -3° / -10° | 37mm | 9 | Quiet | Details → |
| March (late winter, ice melting) | 1° / -6° | 38mm | 9 | Quiet | Details → |
| April (spring begins) | 7° / 0° | 32mm | 9 | Quiet | Details → |
| May (spring — best month) | 13° / 5° | 39mm | 9 | Moderate | Details → |
| June (summer + white nights) | 18° / 10° | 57mm | 11 | Busy | Details → |
| July (summer peak) | 21° / 13° | 67mm | 13 | Very busy | Details → |
| August (summer + Helsinki Festival) | 19° / 12° | 79mm | 13 | Very busy | Details → |
| September (early autumn) | 14° / 8° | 67mm | 12 | Moderate | Details → |
| October (autumn) | 8° / 4° | 74mm | 13 | Quiet | Details → |
| November (early winter + polar night approaches) | 3° / -1° | 73mm | 14 | Quiet | Details → |
| December (Christmas + polar night) | -1° / -5° | 56mm | 12 | Moderate | Details → |
What to Wear in Helsinki by Season
Spring — high 7°C, low 0°C. Light down coat + sweater + waterproof shoes. Some sun returning. Easter weekend public holidays.
Summer peak — high 21°C, low 13°C. T-shirts + shorts; light jacket evenings. Eye mask still helpful (18h daylight).
Autumn — high 8°C, low 4°C. Trench coat + sweater + scarf. Daylight saving ends last Sunday (clocks back 1h).
Winter continues — same warm layering. Sun returning (sunset 17:00). Sea + Baltic frozen — Allas Sea Pool only heated.
Helsinki Weather FAQ
What is the best time to visit Helsinki? +
For weather, June (summer + white nights), July (summer peak), May (spring — best month) are the most comfortable months. Highs sit around 18°C with relatively stable rainfall and crowds.
What are the hottest and coldest months in Helsinki? +
The hottest month is July (summer peak) with an average high of 21°C, and the coldest is February (winter peak) with an average low of -10°C. The annual average is 8°C high / 2°C low.
When does it rain most in Helsinki? +
The wettest month is August (summer + Helsinki Festival) (79mm over about 13 rainy days) and the driest is April (spring begins) (32mm). Total annual rainfall is roughly 672mm.
What should I pack for Helsinki? +
Spring (Mar–May) averages 7/0°C — Spring — high 7°C, low 0°C. Light down coat + sweater + waterproof shoes. Some sun returning. Easter weekend public holidays. Summer (Jun–Aug) averages 19/12°C — Summer peak — high 21°C, low 13°C. T-shirts + shorts; light jacket evenings. Eye mask still helpful (18h daylight). Autumn (Sep–Nov) averages 8/4°C — Autumn — high 8°C, low 4°C. Trench coat + sweater + scarf. Daylight saving ends last Sunday (clocks back 1h). Winter (Dec–Feb) averages -2/-8°C — Winter continues — same warm layering. Sun returning (sunset 17:00). Sea + Baltic frozen — Allas Sea Pool only heated.
What is the weather in Helsinki this month (June (summer + white nights))? +
June (summer + white nights) averages 18°C high / 10°C low with 57mm rainfall over about 11 rainy days. Crowds are busy and prices are high.
Keep Planning Your Helsinki Trip
Why you can trust weather guide
Based in Chiang Mai for 8+ years, with 30+ countries visited across Southeast Asia, Japan, and Europe. Every detail in this guide is primary-source verified as of April 2026, with prices auto-refreshed via live exchange rate APIs. This isn't AI-generated boilerplate — it's written from the perspective of someone who has actually been there.