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Turku, Finland climate
Dfb Warm-summer humid continental
Turku has a seasonal cold-temperate climate (Warm-summer humid continental, Köppen Dfb). The hottest month is July with an average daily high near 23°C, while the coldest is February averaging around −8°C at night. Around 702 mm of precipitation falls each year, peaking in July (80 mm) and easing off in April (33 mm). At latitude 61°N, day length swings from 5.4 hours in midwinter to 18.6 hours at midsummer.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresClear vs cloudy days
Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day countsTurku climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | −1 | −2 | 2 | 9 | 15 | 20 | 23 | 21 | 16 | 9 | 3 | 0 |
| Avg temp (°C) | −3 | −5 | −1 | 5 | 10 | 15 | 18 | 16 | 11 | 6 | 1 | −2 |
| Avg low (°C) | −6 | −8 | −5 | 0 | 4 | 9 | 13 | 12 | 7 | 3 | −1 | −4 |
| Precipitation (mm) | 62 | 44 | 43 | 33 | 35 | 59 | 80 | 74 | 60 | 72 | 71 | 67 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | −1 | −2 | 2 | 9 | 15 | 20 |
| Avg temp (°C) | −3 | −5 | −1 | 5 | 10 | 15 |
| Avg low (°C) | −6 | −8 | −5 | 0 | 4 | 9 |
| Precipitation (mm) | 62 | 44 | 43 | 33 | 35 | 59 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 23 | 21 | 16 | 9 | 3 | 0 |
| Avg temp (°C) | 18 | 16 | 11 | 6 | 1 | −2 |
| Avg low (°C) | 13 | 12 | 7 | 3 | −1 | −4 |
| Precipitation (mm) | 80 | 74 | 60 | 72 | 71 | 67 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 10 | 7 | 6 | 5 | 5 | 6 | 6 | 6 | 6 | 7 | 8 | 9 |
| Days with high ≥ 32°C (days) | — | — | — | — | — | — | 0.1 | — | — | — | — | — |
| Days with low ≤ 0°C (days) | 20 | 18 | 19 | 12 | 3 | 0.1 | — | — | 2 | 7 | 13 | 18 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 10 | 7 | 6 | 5 | 5 | 6 |
| Days with high ≥ 32°C (days) | — | — | — | — | — | — |
| Days with low ≤ 0°C (days) | 20 | 18 | 19 | 12 | 3 | 0.1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 6 | 6 | 6 | 7 | 8 | 9 |
| Days with high ≥ 32°C (days) | 0.1 | — | — | — | — | — |
| Days with low ≤ 0°C (days) | — | — | 2 | 7 | 13 | 18 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 76 | 71 | 65 | 65 | 61 | 63 | 63 | 63 | 66 | 75 | 78 | 77 |
| Clear days (≤ 30% cloud) | 2 | 3 | 4 | 4 | 5 | 4 | 5 | 4 | 4 | 2 | 2 | 3 |
| Partly cloudy days (30–70%) | 8 | 9 | 12 | 11 | 13 | 12 | 11 | 13 | 10 | 8 | 7 | 7 |
| Cloudy days (≥ 70%) | 21 | 17 | 15 | 15 | 13 | 14 | 15 | 14 | 16 | 21 | 21 | 21 |
| Relative humidity (%) | 97 | 96 | 92 | 83 | 77 | 77 | 77 | 79 | 84 | 91 | 95 | 97 |
| Wind speed (m/s) | 0.8 | 0.8 | 0.8 | 0.7 | 0.5 | 0.5 | 0.5 | 0.6 | 0.6 | 0.6 | 0.7 | 0.8 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 76 | 71 | 65 | 65 | 61 | 63 |
| Clear days (≤ 30% cloud) | 2 | 3 | 4 | 4 | 5 | 4 |
| Partly cloudy days (30–70%) | 8 | 9 | 12 | 11 | 13 | 12 |
| Cloudy days (≥ 70%) | 21 | 17 | 15 | 15 | 13 | 14 |
| Relative humidity (%) | 97 | 96 | 92 | 83 | 77 | 77 |
| Wind speed (m/s) | 0.8 | 0.8 | 0.8 | 0.7 | 0.5 | 0.5 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 63 | 63 | 66 | 75 | 78 | 77 |
| Clear days (≤ 30% cloud) | 5 | 4 | 4 | 2 | 2 | 3 |
| Partly cloudy days (30–70%) | 11 | 13 | 10 | 8 | 7 | 7 |
| Cloudy days (≥ 70%) | 15 | 14 | 16 | 21 | 21 | 21 |
| Relative humidity (%) | 77 | 79 | 84 | 91 | 95 | 97 |
| Wind speed (m/s) | 0.5 | 0.6 | 0.6 | 0.6 | 0.7 | 0.8 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 22 years of daily observations at Turku Turun Lentoasema, a weather station, about 7 km from the city centre. The underlying daily records come from NOAA's global station network.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.