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Weather extremes
How extreme does San Juan's weather get?
The hottest, coldest, wettest and snowiest days San Juan has recorded — the outer limits of what its weather can do, and how far they sit beyond a normal day.
The four kinds of extreme
The hottest, coldest, wettest and snowiest single days San Juan has recorded — each shown against what a normal day that time of year looks like.
That is about 14°F hotter than a normal June afternoon in San Juan (typical high near 97°F).
The three most extreme on record
About 36°F colder than a normal December night in San Juan (typical low near 54°F).
The three most extreme on record
More rain in a single day than San Juan usually gets in the whole month of August (typical August total about 1.8 in).
The three most extreme on record
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.
San Juan's record heat sits well above even a hot day for the season — June's 111°F is about 14°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
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Mcallen Miller Intl AP (NOAA GHCN station USW00012959), about 9 km from the city centre.