Finland
Best time to visit Helsinki
Based on 3 years of real historical weather data (2015–2017). Sunshine hours, rainfall, and temperature — week by week.
Planning a trip, an event, or a party in Helsinki? Here's what to expect. Summers here run mild (around 17°C at midday), and winters are freezing (around -1°C at midday). For the best odds of good weather, aim for August, July and May. Mornings sit around 15°C, climbing to 18°C by midday and staying at 19°C into the afternoon, before cooling to 18°C in the evening. You'll get up to 11h of sunshine a day, with some rain. If you can be flexible, steer clear of October and February — that's when conditions are least reliable.
Month-by-month weather
If you visit in January: mornings sit around -5°C, climbing to -4°C by midday and staying at -4°C into the afternoon, before cooling to -5°C in the evening.
If you visit in February: mornings sit around -2°C, climbing to -1°C by midday and staying at 0°C into the afternoon, before cooling to -1°C in the evening.
If you visit in March: mornings sit around -1°C, climbing to 1°C by midday and staying at 3°C into the afternoon, before cooling to 1°C in the evening.
If you visit in April: mornings sit around 2°C, climbing to 5°C by midday and staying at 6°C into the afternoon, before cooling to 5°C in the evening.
If you visit in May: mornings sit around 8°C, climbing to 12°C by midday and staying at 13°C into the afternoon, before cooling to 12°C in the evening.
If you visit in June: mornings sit around 13°C, climbing to 15°C by midday and staying at 16°C into the afternoon, before cooling to 15°C in the evening.
If you visit in July: mornings sit around 15°C, climbing to 18°C by midday and staying at 19°C into the afternoon, before cooling to 18°C in the evening.
If you visit in August: mornings sit around 15°C, climbing to 18°C by midday and staying at 19°C into the afternoon, before cooling to 18°C in the evening.
If you visit in September: mornings sit around 11°C, climbing to 14°C by midday and staying at 15°C into the afternoon, before cooling to 13°C in the evening.
If you visit in October: mornings sit around 4°C, climbing to 6°C by midday and staying at 7°C into the afternoon, before cooling to 5°C in the evening.
If you visit in November: mornings sit around 2°C, climbing to 3°C by midday and staying at 3°C into the afternoon, before cooling to 3°C in the evening.
If you visit in December: mornings sit around 2°C, climbing to 2°C by midday and staying at 2°C into the afternoon, before cooling to 2°C in the evening.
Frequently asked questions
What is the best time to visit Helsinki?
If you're planning a trip, wedding, or outdoor event in Helsinki, aim for August, July and May — Mornings sit around 15°C, climbing to 18°C by midday and staying at 19°C into the afternoon, before cooling to 18°C in the evening. You'll get up to 11h of sunshine a day, with some rain. This is based on 3 years of real historical weather data (2015–2017), not a single forecast.
What is the weather like in Helsinki in August?
If you visit Helsinki in August, mornings sit around 15°C, climbing to 18°C by midday and staying at 19°C into the afternoon, before cooling to 18°C in the evening. You'll get around 11h of sunshine per day and 2.5mm of rain — some rain.
What is the hottest month in Helsinki?
July is typically the hottest month, running mild — good to know if you're planning something outdoors and want to avoid the peak heat.
What is the driest month in Helsinki?
March is your safest bet if you want to avoid rain, averaging only 1.1mm per day. November is the wettest, at 3.2mm per day — worth planning around if you're hosting anything outdoors.
When should I avoid visiting Helsinki?
If you have flexibility on dates, October and February are worth avoiding — colder temperatures and more rainfall make them the least reliable months for a trip or event.
All weeks ranked by weather score
| Week | Dates | Midday temp | Range | Sun / day | Rain / day | Score |
|---|---|---|---|---|---|---|
| W34 | Aug 19–25 | 17°C | 10.1° → 20.5° | 9.4h | 1.0mm | 82 |
| W33 | Aug 12–18 | 18°C | 11.6° → 22° | 11.6h | 1.9mm | 81 |
| W30 | Jul 22–28 | 19°C | 13° → 21.8° | 12.8h | 2.4mm | 80 |
| W32 | Aug 5–11 | 18°C | 11.1° → 22.1° | 13.1h | 2.1mm | 80 |
| W29 | Jul 15–21 | 18°C | 11.5° → 21° | 12.1h | 1.8mm | 79 |
| W22 | May 27–Jun 2 | 14°C | 6.4° → 19.8° | 15.0h | 0.8mm | 76 |
| W21 | May 20–26 | 13°C | 7.2° → 17.7° | 13.4h | 1.0mm | 75 |
| W27 | Jul 1–7 | 17°C | 10.4° → 21.2° | 12.9h | 2.5mm | 75 |
| W26 | Jun 24–30 | 17°C | 10.9° → 20.4° | 13.1h | 2.7mm | 72 |
| W23 | Jun 3–9 | 14°C | 7.4° → 17.5° | 13.6h | 1.5mm | 71 |
| W37 | Sep 9–15 | 14°C | 8.1° → 17.7° | 9.6h | 1.9mm | 71 |
| W20 | May 13–19 | 11°C | 1.9° → 16.2° | 12.7h | 1.3mm | 70 |
| W25 | Jun 17–23 | 16°C | 9.1° → 20.7° | 12.7h | 3.1mm | 69 |
| W31 | Jul 29–Aug 4 | 18°C | 13.3° → 20.3° | 12.4h | 3.9mm | 69 |
| W18 | Apr 29–May 5 | 11°C | 2° → 14.4° | 12.6h | 2.1mm | 66 |
| W24 | Jun 10–16 | 15°C | 8.5° → 20.4° | 12.0h | 3.8mm | 65 |
| W35 | Aug 26–Sep 1 | 17°C | 9.7° → 20.7° | 8.5h | 3.4mm | 65 |
| W28 | Jul 8–14 | 17°C | 11.4° → 20° | 12.5h | 5.3mm | 63 |
| W15 | Apr 8–14 | 5°C | −2.6° → +10° | 11.0h | 0.6mm | 62 |
| W19 | May 6–12 | 10°C | 1.7° → 13.8° | 13.0h | 2.3mm | 62 |
| W36 | Sep 2–8 | 15°C | 9.3° → 18.5° | 6.7h | 2.3mm | 61 |
| W38 | Sep 16–22 | 13°C | 8.1° → 15.5° | 6.5h | 1.5mm | 61 |
| W39 | Sep 23–29 | 13°C | 8° → 16.3° | 7.1h | 1.8mm | 61 |
| W16 | Apr 15–21 | 5°C | −1.9° → +8.7° | 10.9h | 1.9mm | 56 |
| W17 | Apr 22–28 | 6°C | 0.1° → 10.5° | 10.7h | 2.8mm | 56 |
| W42 | Oct 14–20 | 6°C | 0.3° → 10.2° | 6.3h | 0.5mm | 56 |
| W11 | Mar 11–17 | 2°C | −4.2° → +6.3° | 8.4h | 1.0mm | 55 |
| W12 | Mar 18–24 | 1°C | −6.8° → +7° | 7.9h | 0.6mm | 54 |
| W13 | Mar 25–31 | 3°C | −3.7° → +7.5° | 7.4h | 1.0mm | 51 |
| W14 | Apr 1–7 | 4°C | −1.5° → +8° | 7.1h | 1.9mm | 48 |
| W44 | Oct 28–Nov 3 | 3°C | −3.4° → +7.2° | 4.2h | 0.4mm | 44 |
| W7 | Feb 12–18 | 0°C | −6.8° → +4° | 4.5h | 1.3mm | 43 |
| W8 | Feb 19–25 | -1°C | −9.9° → +2.2° | 5.1h | 1.6mm | 43 |
| W41 | Oct 7–13 | 6°C | 0.6° → 10° | 4.2h | 2.4mm | 42 |
| W40 | Sep 30–Oct 6 | 9°C | 4.7° → 13° | 5.4h | 4.2mm | 41 |
| W9 | Feb 26–Mar 3 | -1°C | −7.7° → +2.6° | 3.5h | 1.2mm | 40 |
| W10 | Mar 4–10 | 0°C | −4.6° → +4.1° | 3.4h | 1.6mm | 38 |
| W52 | Dec 23–29 | 3°C | −4.5° → +6.3° | 2.5h | 1.5mm | 36 |
| W4 | Jan 22–28 | -1°C | −5.4° → +2.4° | 1.8h | 1.3mm | 35 |
| W3 | Jan 15–21 | -5°C | −15.3° → +1.7° | 1.8h | 1.5mm | 34 |
| W51 | Dec 16–22 | 2°C | −2° → +5.9° | 1.4h | 1.3mm | 34 |
| W48 | Nov 25–Dec 1 | 1°C | −4.4° → +5° | 2.2h | 2.3mm | 32 |
| W1 | Jan 1–7 | -8°C | −15.9° → −0.3° | 0.8h | 1.7mm | 31 |
| W6 | Feb 5–11 | -3°C | −8.2° → +1.9° | 2.8h | 2.8mm | 31 |
| W43 | Oct 21–27 | 5°C | 0.1° → 8.3° | 2.6h | 3.2mm | 31 |
| W50 | Dec 9–15 | 1°C | −2.9° → +4.7° | 1.7h | 2.2mm | 31 |
| W2 | Jan 8–14 | -5°C | −11.5° → −0.3° | 1.1h | 2.0mm | 30 |
| W45 | Nov 4–10 | 3°C | −1.3° → +6.8° | 2.5h | 2.9mm | 30 |
| W49 | Dec 2–8 | 1°C | −4.8° → +6.3° | 1.8h | 2.5mm | 30 |
| W46 | Nov 11–17 | 3°C | −1.5° → +6.8° | 1.8h | 3.1mm | 28 |
| W5 | Jan 29–Feb 4 | -1°C | −4.8° → +1.6° | 1.1h | 2.4mm | 27 |
| W47 | Nov 18–24 | 3°C | −1.9° → +7° | 1.0h | 4.4mm | 19 |
Nail down the right dates for Helsinki
Compare individual weeks, see year-by-year variation, and download the data as Excel — everything you need to plan a trip, wedding, or event.
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