The hottest, coldest, wettest and snowiest days La Unión has
recorded — the outer limits of what its weather can do, and how far
they sit beyond a normal day.
Based on 21 years of daily weather observations (2004–present), from the La Union/Cpi station 7 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 La Unión
has recorded — each shown against what a normal day that time of year
looks like.
🔥Hottest day
104°FJul 20, 2020
The three most extreme on record
1104°FJul 20, 2020
2103°FAug 2, 2019
3102°FApr 2, 2021
❄️Coldest night
63°FDec 17, 2010
The three most extreme on record
163°FDec 17, 2010
265°FJan 6, 2011
367°FOct 17, 2011
🌧️Most rain in one day
9.22 inOct 11, 2022
The three most extreme on record
19.22 inOct 11, 2022recent
26.85 inAug 26, 2011
36.65 inSep 21, 2022
In plain terms
Across the record, La Unión has reached as high as 104°F and as low as 63°F. A single day has delivered over 9 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 24 years of daily observations at Amapala/los Pelonas, a weather station, about 20 km from the city centre. The underlying daily records come from NOAA's global station network.