Best time to visit Turku

Re-score for me — drag the dial — every chart on the page recolours live for your heat limit 27°C
I'm comfortable up to 27°C feels-like
22° heat-averse 30° heat-loving

Default 27 °C is the upper edge of the Holiday Climate Index "ideal comfort" band (Scott, Rutty, Amelung & Tang, 2016). Above this, most warm-tourism travellers report measurable discomfort.

Saved to this browser. Changes update the strips below.
Recent · 2020-2024
Interest Google Trends 2021-2025 searches, not arrivals (?)
Day · avg daily high (?)
Night · avg overnight low (?)
UV index · On a typical day around midday, UV is about this (?)
112444321
On the sunniest 1 in 10 days, UV reaches this — and even higher
3
PM2.5 air quality · on a typical day (?)
567554445456
On the worst 1 in 10 days, PM2.5 reaches this — and even higher
810119987697710
June 9/10 feels 20°C (+3°C vs 1991-2020) · HCI 91/100
Day 22° · Night 12° 52% humidity 18 km/h wind 9 rain days (88h) 348h sun
Thermal 10
Sky 9
Rain 8
Wind 10

Higher = better, including rain & wind (green = "doesn't hurt the score", not "lots of it").

How is this scored? HCI / Steadman / CCI gate — full methodology and citations below.

Compare with another destination

Add as many as you like — stacked below the main strips above. Each row is just the recent-window score strip and (for beach destinations) sea-temperature strip.

Tours in Turku

6 top-rated tours via Viator. Booking links earn this site a commission at no cost to you.

  1. 1Historic Turku Private Walking Tour – Cultural Heritage5.00★ (4)2hfrom $649
  2. 2Experience Turku with a local guide5.00★ (2)2hfrom $275
  3. 3Best Intro to Turku in 2 hours with a Local5.00★ (2)2hfrom $159
  4. 4Järvelä Sauna Experience in the Turku Archipelago5.00★ (1)2hfrom $18
  5. 5Explore Turku in 60 minutes with a Local1hfrom $91
  6. 6Turku Private Transfer from Turku city centre to Turku airport30mfrom $83

Last refreshed 2026-10-18.

Similar climatesTallinn95% · Helsinki94% · Visby92%

Other destinations with the most-alike year-round climate to Turku (apparent temperature, rain hours, sunshine — matched within the same trip-profile). The ±N chip compares each match's typical score for the current month against Turku's. Based on the 2020-2024 climatology, not this year's actual weather.

Month-by-month

Month Temp °C Feels °C Rain days Rain h Rain h/day Humidity Wind km/h Sun h UV Interest Score
Jan -5–0 -5 13 173 13.3 87% 21 48 — Quiet 3
Feb -6–0 -5 11 122 11.1 83% 20 83 1 Quiet 4
Mar -4–3 -1 9 121 13.4 75% 19 169 1 Quiet 5
Apr -1–8 4 10 119 11.9 62% 19 232 2 Quiet 5
May 5–15 12 9 98 10.9 52% 19 308 4 Quiet 7
Jun 12–22 20 9 88 9.8 52% 18 348 4 Busy 9
Jul 14–21 21 18 190 10.6 63% 18 322 4 Peak 7
Aug 13–21 20 15 176 11.7 68% 18 268 3 Busy 7
Sep 9–16 14 10 117 11.7 72% 18 193 2 Quiet 7
Oct 5–10 7 15 185 12.3 81% 21 125 1 Quiet 4
Nov 1–5 1 13 159 12.2 86% 19 53 — Quiet 3
Dec -4–0 -4 12 175 14.6 89% 17 27 — Quiet 3

UV Index in Turku by Month

UV index in Turku peaks at 4 (moderate) in June, dropping to 0 (low) in January.

Best months in detail

June

9/10

12–22°C (feels 20°C) · 9 rain days (88h) · 348 sun hours · 52% humidity · Busy crowd · UV 4 (moderate)

May

7/10

5–15°C (feels 12°C) · 9 rain days (98h) · 308 sun hours · 52% humidity · Quiet crowd · UV 4 (moderate)

August

7/10

13–21°C · 15 rain days (176h) · 268 sun hours · 68% humidity · Busy crowd · UV 3 (moderate)

Every month

Show the other 9 months in detail

January

3/10

-5–0°C (feels -5°C) · 13 rain days (173h) · 48 sun hours · 87% humidity · Quiet crowd

February

4/10

-6–0°C (feels -5°C) · 11 rain days (122h) · 83 sun hours · 83% humidity · Quiet crowd · UV 1 (low)

March

5/10

-4–3°C (feels -1°C) · 9 rain days (121h) · 169 sun hours · 75% humidity · Quiet crowd · UV 1 (low)

April

5/10

-1–8°C (feels 4°C) · 10 rain days (119h) · 232 sun hours · 62% humidity · Quiet crowd · UV 2 (low) · sunniest 1 in 10 days reach 3 (moderate)

July

7/10

14–21°C · 18 rain days (190h) · 322 sun hours · 63% humidity · Peak crowd · UV 4 (moderate)

September

7/10

9–16°C (feels 14°C) · 10 rain days (117h) · 193 sun hours · 72% humidity · Quiet crowd · UV 2 (low)

October

4/10

5–10°C (feels 7°C) · 15 rain days (185h) · 125 sun hours · 81% humidity · Quiet crowd · UV 1 (low)

November

3/10

1–5°C (feels 1°C) · 13 rain days (159h) · 53 sun hours · 86% humidity · Quiet crowd

December

3/10

-4–0°C (feels -4°C) · 12 rain days (175h) · 27 sun hours · 89% humidity · Quiet crowd

Frequently asked questions about visiting Turku

When is the best time to visit Turku?

June is the highest-scoring month (9/10 on the Holiday Climate Index). Typical conditions: 12–22°C (9 rainy days). The top three months by score are June, May, August.

What is the worst time to visit Turku?

December is the lowest-scoring month (3/10). Typical conditions: -4–0°C (12 rainy days).

When are crowds lowest in Turku?

Search-interest seasonality (Google Trends 2021-2025) is lowest in December and peaks in July. Interest tracks both in-trip visitors and lead-time planners, so treat it as a "destination is on people's minds" signal rather than literal arrivals.

Which months in Turku have good weather but fewer tourists?

May (climate 7/10, crowd index 39) and September (climate 7/10, crowd index 27) — shoulder months with above-average climate and below-median search-interest. Often the best value-for-weather trade.

What is the UV index in Turku by month?

UV peaks at 4 (moderate) in June and is lowest in January at 0 (low). Monthly peak values: Jan —, Feb 1, Mar 1, Apr 2, May 4, Jun 4, Jul 4, Aug 3, Sep 2, Oct 1, Nov —, Dec —.

What is the UV index in Turku in June?

June is the peak UV month in Turku, with a daily-peak UV index of 4 (moderate). Standard sun protection — sunglasses and light SPF — is recommended.

How high can UV get in Turku on the sunniest days?

Most days look like the monthly average, but on the sunniest ~1 in 10 days UV climbs higher than the mean suggests. April is the worst case: typical days average UV 2 (low), but the top 10% of days reach UV 3 (moderate) — and even higher. Months where the sunniest days routinely exceed the typical reading: April. Plan sun protection for the worst case, not the average.