How extreme does Sundsvall's weather get?

The hottest, coldest, wettest and snowiest days Sundsvall 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 Sundsvalls Flygplats station 16 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 Sundsvall has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day

91°F Jul 26, 1994

That is about 21°F hotter than a normal July afternoon in Sundsvall (typical high near 70°F).

The three most extreme on record

1 91°F Jul 26, 1994

2 90°F Jul 3, 2015

3 89°F Jul 23, 2014

❄️ Coldest night

-34°F Dec 31, 1978

About 52°F colder than a normal December night in Sundsvall (typical low near 18°F).

The three most extreme on record

1 -34°F Dec 31, 1978

2 -30°F Jan 11, 1987

3 -28°F Jan 1, 1979

🌧️ Most rain in one day

2.44 in Sep 9, 2001

More rain in a single day than Sundsvall usually gets in the whole month of September (typical September total about 1.9 in).

The three most extreme on record

1 2.44 in Sep 9, 2001

2 2.41 in Aug 27, 2001

3 2.17 in Sep 10, 2001

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

Sundsvall's record heat sits well above even a hot day for the season — July's 91°F is about 21°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, Sundsvall's warmest days reach the low 70s°F and its coldest nights drop to the low 10s°F. But across the record it has gone as high as 91°F and as low as −34°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 30 years of daily observations at Sundsvalls Flygplats, a weather station, about 16 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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