How extreme does San Juan Capistrano's weather get?

The hottest, coldest, wettest and snowiest days San Juan Capistrano has recorded — the outer limits of what its weather can do, and how far they sit beyond a normal day.

Based on 27 years of daily weather observations (1999–present), from the Santa Ana John Wayne Ap station 27 km away. Updated through May 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 San Juan Capistrano has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day

110°F Sep 27, 2010

That is about 30°F hotter than a normal September afternoon in San Juan Capistrano (typical high near 80°F).

The three most extreme on record

1 110°F Sep 27, 2010

2 109°F Sep 6, 2024

3 108°F Jul 6, 2018

❄️ Coldest night

12°F Mar 15, 2008

About 40°F colder than a normal March night in San Juan Capistrano (typical low near 52°F).

The three most extreme on record

1 12°F Mar 15, 2008

2 33°F Jan 14, 2007

3 35°F Jan 30, 2002

🌧️ Most rain in one day

3.24 in Dec 6, 2018

More rain in a single day than San Juan Capistrano usually gets in the whole month of December (typical December total about 2.0 in).

The three most extreme on record

1 3.24 in Dec 6, 2018

2 2.68 in Oct 20, 2004

3 2.27 in Jan 22, 2017

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

San Juan Capistrano's record heat sits well above even a hot day for the season — September's 110°F is about 30°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, San Juan Capistrano's warmest days reach the low 80s°F and its coldest nights drop to the high 40s°F. But across the record it has gone as high as 110°F and as low as 12°F. A single day has delivered over 3 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 — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Santa Ana Fire Stn (NOAA GHCN station USC00047888), about 33 km from the city centre.

How we build these numbers →

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