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Weather extremes
How extreme does San Marcos's weather get?
The hottest, coldest, wettest and snowiest days San Marcos 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 Marcos has recorded — each shown against what a normal day that time of year looks like.
That is about 28°F hotter than a normal September afternoon in San Marcos (typical high near 87°F).
The three most extreme on record
About 57°F colder than a normal September night in San Marcos (typical low near 63°F).
The three most extreme on record
More rain in a single day than San Marcos usually gets in the whole month of January (typical January total about 3.2 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 Marcos's record heat sits well above even a hot day for the season — September's 115°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
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Escondido #2 (NOAA GHCN station USC00042863), about 8 km from the city centre.