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Weather extremes

How extreme does Wismar's weather get?

The hottest, coldest, wettest and snowiest days Wismar 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 Boltenhagen station 21 km away. Updated through February 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 Wismar has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day
99°F Jul 20, 2022

That is about 28°F hotter than a normal July afternoon in Wismar (typical high near 71°F).

The three most extreme on record

1 99°F Jul 20, 2022recent
2 98°F Aug 9, 1992
3 98°F Jul 2, 2025
❄️ Coldest night
-1°F Feb 1, 1972

About 32°F colder than a normal February night in Wismar (typical low near 31°F).

The three most extreme on record

1 -1°F Feb 1, 1972
2 -1°F Feb 20, 1978
3 -1°F Jan 14, 1987
🌧️ Most rain in one day
2.62 in Aug 10, 2007

About 97% of a typical August's rain in a single day (Wismar averages roughly 2.7 in across the month).

The three most extreme on record

1 2.62 in Aug 10, 2007
2 2.61 in Jul 30, 1972
3 2.44 in Jun 15, 2019

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 99°F JanFebMarAprMayJunJulAugSepOctNovDec
normal range of daily temperatureshottest ever recordedcoldest ever recorded

Wismar's record heat sits well above even a hot day for the season — July's 99°F is about 28°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, Wismar's warmest days reach the low 70s°F and its coldest nights drop to the low 30s°F. But across the record it has gone as high as 99°F and as low as −1°F. A single day has delivered over 3 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 Boltenhagen, a weather station, about 21 km from the city centre. The underlying daily records come from NOAA's global station network.

How we build these numbers →