How extreme does Turku's weather get?

The hottest, coldest, wettest and snowiest days Turku has recorded — the outer limits of what its weather can do, and how far they sit beyond a normal day.

Based on 50+ years of daily weather observations (1971–present), from the Turku Turun Lentoasema station 7 km away. Updated through March 2026 — an all-time extreme only changes when a more extreme day actually occurs, so some dates are old. That is normal, not stale data.

The four kinds of extreme

The hottest, coldest, wettest and snowiest single days Turku has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day

90°F Jun 14, 1977

That is about 22°F hotter than a normal June afternoon in Turku (typical high near 68°F).

The three most extreme on record

1 90°F Jun 14, 1977

2 90°F Jul 30, 2003

3 90°F Jul 13, 2010

❄️ Coldest night

-31°F Jan 10, 1987

About 52°F colder than a normal January night in Turku (typical low near 21°F).

The three most extreme on record

1 -31°F Jan 10, 1987

2 -29°F Dec 31, 1978

3 -29°F Jan 9, 1987

🌧️ Most rain in one day

2.46 in Jul 28, 1988

About 78% of a typical July's rain in a single day (Turku averages roughly 3.2 in across the month).

The three most extreme on record

1 2.46 in Jul 28, 1988

2 2.26 in Jul 28, 1997

3 2.04 in Jul 24, 1993

How hot and cold it gets, month by month

The shaded band is the normal range of daily temperatures for each month. The dots show the most extreme it has ever been — so you can see how far beyond a normal day the records really sit.

normal range of daily temperatureshottest ever recordedcoldest ever recorded

Turku's record heat sits well above even a hot day for the season — June's 90°F is about 22°F beyond a normal hot afternoon. Its record cold is just as far below a normal winter night — the dots mark how rare each extreme really is.

In plain terms

In a normal year, Turku's warmest days reach the low 70s°F and its coldest nights drop to the high 10s°F. But across the record it has gone as high as 90°F and as low as −31°F. A single day has delivered over 2 inches of rain. Those are the outer edges worth knowing if you are moving here, planning a trip, or thinking about a house.

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.

How we build these numbers →

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