Turku climate
Turku (Finland) has a warm-summer humid continental climate (Köppen Dfb). The average temperature over the year is 6 °C42 °F, and about 723 mm28 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Turku climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin | Frost days |
|---|---|---|---|---|---|
| Jan | −228 | −720 | −524 | 592.3 | 27 |
| Feb | −228 | −818 | −523 | 471.9 | 26 |
| Mar | 235 | −523 | −229 | 421.7 | 28 |
| Apr | 847 | 031 | 439 | 411.6 | 18 |
| May | 1559 | 541 | 1050 | 471.9 | 3 |
| Jun | 1966 | 1049 | 1458 | 652.5 | 0 |
| Jul | 2272 | 1356 | 1864 | 642.5 | 0 |
| Aug | 2170 | 1254 | 1762 | 722.8 | 0 |
| Sep | 1660 | 847 | 1254 | 632.5 | 0 |
| Oct | 947 | 338 | 643 | 783.1 | 8 |
| Nov | 338 | 032 | 235 | 742.9 | 14 |
| Dec | 032 | −425 | −228 | 702.8 | 23 |
| Year | 2272 | −818 | 642 | 72328 | 147 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total. Frost days are for the whole grid cell.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 97% | 83% | 0.3 | 6:33 |
| Feb | 97% | 79% | 0.8 | 8:58 |
| Mar | 91% | 70% | 2.2 | 11:34 |
| Apr | 82% | 67% | 3.8 | 14:30 |
| May | 78% | 61% | 5.2 | 17:13 |
| Jun | 77% | 64% | 5.6 | 18:59 |
| Jul | 77% | 64% | 5.2 | 18:13 |
| Aug | 79% | 63% | 4.1 | 15:41 |
| Sep | 85% | 67% | 2.4 | 12:45 |
| Oct | 91% | 77% | 1.1 | 9:55 |
| Nov | 96% | 85% | 0.3 | 7:16 |
| Dec | 97% | 84% | 0.1 | 5:46 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Turku is like
The warmest month is July, with an average high of 22 °C72 °F and a low of 13 °C56 °F. The coldest is February, when highs average −2 °C28 °F and lows −8 °C18 °F. Seasons are strongly marked: the warmest month is on average 22.7 °C40.8 °F warmer than the coldest.
Annual precipitation is moderate at about 723 mm28 in. Rain is spread fairly evenly through the year. The wettest month is October (78 mm3.1 in), the driest is April (41 mm1.6 in).
Relative humidity ranges from 77% in June to 97% in January. The clearest skies (lowest average cloud amount, 61%) are typical of May. Average wind speed near the ground ranges from 2 km/h (1 mph) in June to 3 km/h (2 mph) in January. Daylight lasts from about 5.8 hours in December to 19.0 hours in June.
A lasting snow cover is typical in November–March, when the average snow depth in the reanalysis exceeds 10 cm (deepest in February, about 18 cm).
Best time to visit Turku
Based on these averages, the most comfortable months for sightseeing and outdoor activities are June–August: average highs of 19 °C66 °F to 22 °C72 °F with 64 mm2.5 in to 72 mm2.8 in of precipitation per month.
The most challenging month is February, which is cold, with average highs of −2 °C28 °F.
Comfort score: months are ranked by how close they come to an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for Turku
- Winter (December–February) — highs −228 to 0 °C32 °F, lows −818 to −4 °C25 °F, about 59 mm2.3 in of precipitation a month. Pack a winter coat, hat, gloves and warm, non-slip boots and shoes with good grip, as frost is common.
- Spring (March–May) — highs 235 to 15 °C59 °F, lows −523 to 5 °C41 °F, about 44 mm1.7 in of precipitation a month. Pack a warm coat, layers and closed shoes and shoes with good grip, as frost is common.
- Summer (June–August) — highs 1966 to 22 °C72 °F, lows 1049 to 13 °C56 °F, about 67 mm2.6 in of precipitation a month. Pack light layers — T-shirts plus a light sweater or jacket.
- Autumn (September–November) — highs 338 to 16 °C60 °F, lows 032 to 8 °C47 °F, about 71 mm2.8 in of precipitation a month. Pack a warm coat, layers and closed shoes.
How Turku compares
Compared with Espoo, about 134 km to the east, Turku is on average 0.4 °C0.8 °F cooler and receives a similar amount of precipitation. The difference is largest in November (1.5 °C2.7 °F cooler).
Of the 9 places in Finland covered by World Climates, Turku is the 3rd warmest by annual mean temperature and the 8th wettest by annual precipitation. See all of them on the Finland climate page.
Places in other countries with the most similar temperature and rainfall pattern: Tallinn (Estonia, Dfb), Uppsala (Sweden, Dfb) and Riga (Latvia, Dfb).
Nearby places
- Espoo 134 km · 6 °C43 °F · 727 mm29 in
- Mariehamn 135 km · 7 °C45 °F · 649 mm26 in
- Tampere 142 km · 4 °C40 °F · 776 mm31 in
- Helsinki 150 km · 6 °C43 °F · 712 mm28 in
- Vantaa 153 km · 5 °C42 °F · 733 mm29 in
- Tallinn 179 km · 6 °C43 °F · 685 mm27 in
- Lahti 194 km · 4 °C40 °F · 746 mm29 in
- Uppsala 264 km · 6 °C44 °F · 704 mm28 in
Frequently asked questions
What is the warmest month in Turku?
July is the warmest month in Turku, with an average high of 22 °C (72 °F) and an average low of 13 °C (56 °F).
What is the coldest month in Turku?
February is the coldest month, with an average high of -2 °C (28 °F) and an average low of -8 °C (18 °F).
When does it rain the most in Turku?
October is the wettest month with about 78 mm (3.1 in) of precipitation; April is the driest with about 41 mm (1.6 in).
What is the best time to visit Turku?
Judging by long-term averages, the most comfortable months are June–August.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.