TurkuPhoto: Kotivalo · CC0Finland · Europe
Best time to visit Turku
Turku is Finland's oldest city, with a medieval castle, riverbanks and the gateway to the vast archipelago. Warm, bright summer, cold, snowy winter.
Climate decision
Best travel months for Turku
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Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Latest 5-year values 2021–2025
Average of the five most recent complete years compared with the 1991–2025 climate average.
June · Mean daily maximum
20.4 °C
1991–2025: 18.4 °C
+1.9 °C · higher
July · Wet days
14.8 days/month
1991–2025: 13.1 days/month
+1.7 days/month · higher
April · Monthly precipitation
59 mm/month
1991–2025: 47.1 mm/month
+11.8 mm/month · higher
July · Sea temperature
18.4 °C
1991–2025: 16.4 °C
+2 °C · higher
July: 1/155 days at or above 30 °C; highest single value 31.7 °C.
Five-year historical sample, not a weather forecast or long-term climate trend. Individual hot days can be far above the monthly mean.
Annual profile · Coast and sea
Turku: the swimming season follows two curves
Average daily highs vary by 23.9 °C through the year, while the sea varies by 16.3 °C. Air and water temperature should therefore be considered separately.
The practical difference
The month with the highest daytime temperature and the month with the warmest sea need not define the same travel window. Rain and sunshine help resolve the trade-off.
Warmest sea
August · 17.2 °C
Highest average daily high
July · 21.6 °C
Fewest rainy days
May · 8.8
Most sunshine
June · 7 h
Month by month
Overall suitability per month. Tap a month for details.
All climate figures compared
The table is the complete accessible data view; the charts below highlight selected patterns.
| Month | Avg high °C | Avg low °C | Rainy days (est.) | Rain mm | Sun h/day (est.) | Humidity % | Wind m/s | Sea °C | Score |
|---|---|---|---|---|---|---|---|---|---|
| January | -2 | -7 | 14 | 62 | 0.3 | 97 | 0.8 | 2 | 16 |
| February | -2 | -8 | 11 | 49 | 1.0 | 97 | 0.8 | 1 | 23 |
| March | 2 | -5 | 10 | 46 | 2.7 | 91 | 0.8 | 1 | 27 |
| April | 8 | -1 | 10 | 47 | 4.7 | 83 | 0.7 | 2 | 34 |
| May | 14 | 4 | 9 | 45 | 6.6 | 77 | 0.5 | 6 | 48 |
| June | 18 | 9 | 11 | 66 | 7.0 | 77 | 0.5 | 12 | 56 |
| July | 22 | 13 | 13 | 64 | 6.5 | 77 | 0.5 | 16 | 62 |
| August | 21 | 12 | 13 | 75 | 5.1 | 79 | 0.6 | 17 | 61 |
| September | 16 | 8 | 11 | 61 | 3.1 | 84 | 0.6 | 14 | 44 |
| October | 9 | 3 | 13 | 81 | 1.3 | 91 | 0.6 | 10 | 22 |
| November | 3 | -1 | 15 | 74 | 0.4 | 95 | 0.7 | 7 | 15 |
| December | -1 | -4 | 15 | 68 | 0.2 | 97 | 0.8 | 4 | 15 |
Climate through the year
Compare temperature, rainy days, sunshine and, for coastal destinations, sea temperature month by month.
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Where to stay in Turku
Compare available stays, prices and cancellation terms for Turku on Booking.com.
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Similar destinations
The number is the overall climate score, not a similarity score.
Frequently asked questions
When is the best time to visit Turku?
The strongest climate months are July, August. Values are historical averages, not a forecast.
Which month has the highest average daily maximum temperature in Turku?
The average daily maximum temperature in Turku is highest in July at around 22 °C.
When is the sea warmest at Turku?
In August, at around 17 °C.