Climate guide for Turku, Finland

Best Time to Visit
Turku

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About Turku

Turku is a sightseeing destination in Finland. Its setting includes Finland's oldest city with a medieval castle, cathedral, and vast archipelago. Use the monthly scores to plan walking and sightseeing days around heat, rainfall, humidity and daylight.

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Travel Tips

Best time to visit Turku
Check seasonal weather curves and book accommodations early for Turku.

Things to do in Turku

Turku, Finland. Live activities and tours from GetYourGuide, matched to this destination.

When to visit Turku: the short answer

The best time to visit Turku is June, followed by May, July. Those months combine the most usable temperatures with the fewest lost days to rain: June averages 16°C with 40 mm of rain and about 28 sunny days. The months to avoid unless you have a specific reason are January, December. If budget matters more than perfect weather, October is the strongest of the low-rate months at 4.6/10.

Across the year Turku swings from -5°C in January to 18°C in August, a 23-degree spread, while rainfall ranges from 26 mm in May to 90 mm in August. That is the whole planning problem in one sentence: Turku is not equally good year-round, and the difference between the best and worst month here is 7.2 points on a 10-point scale.

Warmest month: August (18°C). Coolest: January (-5°C). Driest: May (26 mm). Wettest: August (90 mm).

Turku month by month

January in Turku — the hardest end of the year

Hardest · 2.2/10

January averages -5°C (24°F), cold enough that sightseeing works in bursts rather than in one long day on foot.

Rainfall runs 71 mm, so plan one flexible day in three; you still get about 0 sunny days and 6.2 hours of daylight.

It scores 2.2/10 here, 12th of 12 months, against 9.4/10 in the destination's best month.

Expect mid-season pricing, and crowds are light for this destination.

Pack insulated layers, a windproof shell, gloves and boots with grip, a packable rain layer.

If your dates are flexible, June is materially better in Turku — 7.2 points higher on the same scale.

February in Turku — the hardest end of the year

Hardest · 3/10

February averages -3°C (26°F), cold enough that sightseeing works in bursts rather than in one long day on foot.

Rainfall runs 63 mm, so plan one flexible day in three; you still get about 0 sunny days and 8.6 hours of daylight.

It scores 3/10 here, 10th of 12 months, against 9.4/10 in the destination's best month.

Expect low-season pricing, and crowds are light for this destination.

Pack insulated layers, a windproof shell, gloves and boots with grip, a packable rain layer.

If your dates are flexible, June is materially better in Turku — 6.4 points higher on the same scale.

March in Turku — the hardest end of the year

Hardest · 4.2/10

March averages 0°C (31°F), cold enough that sightseeing works in bursts rather than in one long day on foot.

Rainfall runs 53 mm, so plan one flexible day in three; you still get about 0 sunny days and 11.3 hours of daylight.

It scores 4.2/10 here, 8th of 12 months, against 9.4/10 in the destination's best month.

Expect mid-season pricing, and crowds are light for this destination.

Pack insulated layers, a windproof shell, gloves and boots with grip, a packable rain layer.

If your dates are flexible, June is materially better in Turku — 5.2 points higher on the same scale.

April in Turku — workable with trade-offs

Trade-offs · 6/10

April averages 3°C (38°F), cold enough that sightseeing works in bursts rather than in one long day on foot.

Rainfall runs 54 mm, so plan one flexible day in three; you still get about 11 sunny days and 14.3 hours of daylight.

It scores 6/10 here, 6th of 12 months, against 9.4/10 in the destination's best month.

Expect mid-season pricing, and crowds are moderate.

Pack insulated layers, a windproof shell, gloves and boots with grip, a packable rain layer.

If your dates are flexible, June is materially better in Turku — 3.4 points higher on the same scale.

May in Turku — the year's strongest window

Best window · 8.9/10

May averages 10°C (51°F) — jacket weather. Comfortable for walking and museums, too cool for anything water-based.

Expect 26 mm of rain — occasional showers rather than washed-out days — alongside about 26 sunny days and 16.9 daylight hours.

On our climate-comfort scale this is the top-ranked month of the year for Turku at 8.9/10 — the reference point every other month on this page is measured against.

Expect mid-season pricing, and crowds are moderate.

Pack a mid-weight jacket, long sleeves and shoes you can walk 15 km in.

June in Turku — the year's strongest window

Best window · 9.4/10

June averages 16°C (61°F), the range most people find easiest for walking a city all day without either overheating or losing daylight to weather.

Expect 40 mm of rain — occasional showers rather than washed-out days — alongside about 28 sunny days and 18.6 daylight hours.

On our climate-comfort scale this is the top-ranked month of the year for Turku at 9.4/10 — the reference point every other month on this page is measured against.

Expect mid-season pricing, and crowds are moderate.

Pack layers you can shed by midday plus one warm layer for the evening.

July in Turku — the year's strongest window

Best window · 8.5/10

July averages 18°C (64°F), the range most people find easiest for walking a city all day without either overheating or losing daylight to weather.

Rainfall runs 69 mm, so plan one flexible day in three; you still get about 20 sunny days and 17.9 hours of daylight.

On our climate-comfort scale this is the top-ranked month of the year for Turku at 8.5/10 — the reference point every other month on this page is measured against.

Expect peak pricing, and this is one of the busiest months here. You are paying the year's highest rates for the year's best conditions — book early or shift a few weeks either side.

Pack layers you can shed by midday plus one warm layer for the evening, a packable rain layer.

August in Turku — reliably good (4th best month)

Good · 7.5/10

August averages 18°C (64°F), the range most people find easiest for walking a city all day without either overheating or losing daylight to weather.

Rainfall runs 90 mm, so plan one flexible day in three; you still get about 13 sunny days and 15.4 hours of daylight.

It scores 7.5/10 here, 4th of 12 months, against 9.4/10 in the destination's best month.

Expect peak pricing, and this is one of the busiest months here.

Pack layers you can shed by midday plus one warm layer for the evening, a packable rain layer.

If your dates are flexible, June is materially better in Turku — 1.9 points higher on the same scale.

September in Turku — workable with trade-offs

Trade-offs · 6.9/10

September averages 13°C (55°F), the range most people find easiest for walking a city all day without either overheating or losing daylight to weather.

Rainfall runs 58 mm, so plan one flexible day in three; you still get about 2 sunny days and 12.5 hours of daylight.

It scores 6.9/10 here, 5th of 12 months, against 9.4/10 in the destination's best month.

Expect mid-season pricing, and crowds are moderate.

Pack layers you can shed by midday plus one warm layer for the evening, a packable rain layer.

If your dates are flexible, June is materially better in Turku — 2.5 points higher on the same scale.

October in Turku — the hardest end of the year

Hardest · 4.6/10

October averages 7°C (44°F) — jacket weather. Comfortable for walking and museums, too cool for anything water-based.

Rainfall runs 83 mm, so plan one flexible day in three; you still get about 0 sunny days and 9.7 hours of daylight.

It scores 4.6/10 here, 7th of 12 months, against 9.4/10 in the destination's best month.

Expect low-season pricing, and crowds are light for this destination.

Pack a mid-weight jacket, long sleeves and shoes you can walk 15 km in, a packable rain layer.

If your dates are flexible, June is materially better in Turku — 4.8 points higher on the same scale.

November in Turku — the hardest end of the year

Hardest · 3.3/10

November averages 1°C (34°F), cold enough that sightseeing works in bursts rather than in one long day on foot.

Rainfall runs 74 mm, so plan one flexible day in three; you still get about 0 sunny days and 7 hours of daylight.

It scores 3.3/10 here, 9th of 12 months, against 9.4/10 in the destination's best month.

Expect low-season pricing, and crowds are light for this destination.

Pack insulated layers, a windproof shell, gloves and boots with grip, a packable rain layer.

If your dates are flexible, June is materially better in Turku — 6.1 points higher on the same scale.

December in Turku — the hardest end of the year

Hardest · 2.6/10

December averages -3°C (26°F), cold enough that sightseeing works in bursts rather than in one long day on foot.

Rainfall runs 61 mm, so plan one flexible day in three; you still get about 0 sunny days and 5.4 hours of daylight.

It scores 2.6/10 here, 11th of 12 months, against 9.4/10 in the destination's best month.

Expect mid-season pricing, and crowds are light for this destination.

Pack insulated layers, a windproof shell, gloves and boots with grip, a packable rain layer.

If your dates are flexible, June is materially better in Turku — 6.8 points higher on the same scale.

Frequently asked

When is the best time to visit Turku, Finland?
In Ideal Weather mode, the best months to visit Turku are June, May, July. June is the single peak month with an Ideal Weather score of 9.4/10 based on temperature, rainfall, humidity, daylight and historical sunny days.
What is the weather like in Turku year-round?
Turku has a climate profile suited to sightseeing and cultural travel. Average monthly temperatures range from -5°C in January to 18°C in August, with Ideal Weather scores between 2.2 and 9.4 out of 10.
Which months should I avoid in Turku?
The lowest Ideal Weather-scoring months in Turku are January (2.2/10), December (2.6/10), February (3.0/10). These months typically combine less comfortable temperatures, higher rainfall or fewer sunny days.
When is the rainy season in Turku?
August is the wettest month in Turku, averaging about 90 mm of rainfall. May is the driest, at roughly 26 mm.
Which is the sunniest month in Turku?
June sees the most sun in Turku, with about 28 sunny days on average - ideal for outdoor plans.
Is Turku a good destination for sightseeing and cultural travel?
Turku is well suited to sightseeing and cultural travel. Its highest Ideal Weather window (June, May, July) aligns with the conditions travelers usually look for in this style of trip.
How is the bestime.to score for Turku calculated?
Each month receives an Ideal Weather score from 0-10 using ERA5 climate normals for Turku: temperature comfort, precipitation, humidity, daylight hours, and historical sunny days - weighted for sightseeing and cultural travel.

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