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Weather extremes

How extreme does Słupsk's weather get?

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

Based on 34 years of daily weather observations (1991–present), from the Ustka station 17 km away. Updated through August 2025 — 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 Słupsk has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day
100°F Aug 10, 1992

That is about 29°F hotter than a normal August afternoon in Słupsk (typical high near 71°F).

The three most extreme on record

1 100°F Aug 10, 1992
2 96°F Aug 3, 2014
3 96°F Jul 21, 2022
❄️ Coldest night
-8°F Feb 6, 2012

About 38°F colder than a normal February night in Słupsk (typical low near 30°F).

The three most extreme on record

1 -8°F Feb 6, 2012
2 -2°F Jan 1, 1997
3 -1°F Feb 9, 1996
🌧️ Most rain in one day
3.91 in Sep 24, 2002

More rain in a single day than Słupsk usually gets in the whole month of September (typical September total about 3.2 in).

The three most extreme on record

1 3.91 in Sep 24, 2002
2 3.27 in Jul 31, 2007
3 3.03 in Apr 22, 1995

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.

-30°-10°10°30°50°70°90°110° all-time high 100°F JanFebMarAprMayJunJulAugSepOctNovDec
normal range of daily temperatureshottest ever recordedcoldest ever recorded

Słupsk's record heat sits well above even a hot day for the season — August's 100°F is about 29°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, Słupsk's warmest days reach the low 70s°F and its coldest nights drop to the high 20s°F. But across the record it has gone as high as 100°F and as low as −8°F. A single day has delivered over 4 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 30 years of daily observations at Ustka, a weather station, about 17 km from the city centre. The underlying daily records come from NOAA's global station network.

How we build these numbers →