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Weather extremes
How extreme does Sarnen's weather get?
The hottest, coldest, wettest and snowiest days Sarnen has recorded — the outer limits of what its weather can do, and how far they sit beyond a normal day.
Based on 20 years of daily weather observations (2005–present), from the Alpnach station 6 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 Sarnen has recorded — each shown against what a normal day that time of year looks like.
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Hottest day
93°F
Jul 27, 2013
The three most extreme on record
1
93°F
Jul 27, 2013
2
93°F
Jul 7, 2015
3
93°F
Jun 23, 2017
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Coldest night
3°F
Feb 5, 2012
The three most extreme on record
1
3°F
Feb 5, 2012
2
5°F
Feb 28, 2018
3
9°F
Dec 30, 2005
In plain terms
Across the record, Sarnen has reached as high as 93°F and as low as 3°F. Those are the outer edges worth knowing if you are moving here, planning a trip, or thinking about a house.
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from a national meteorological service, measured at Luzern, about 16 km from the city centre.