How extreme does San Jose's weather get?

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

Based on 50+ years of daily weather observations (1971–present), from the San Jose station 3 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 Jose has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day

109°F Jun 14, 2000

That is about 29°F hotter than a normal June afternoon in San Jose (typical high near 80°F).

The three most extreme on record

1 109°F Jun 14, 2000

2 108°F Jul 14, 1972

3 107°F Jul 17, 1988

❄️ Coldest night

5°F Nov 3, 1988

About 42°F colder than a normal November night in San Jose (typical low near 47°F).

The three most extreme on record

1 5°F Nov 3, 1988

2 5°F Jul 20, 1989

3 19°F Dec 22, 1990

🌧️ Most rain in one day

80.00 in Apr 6, 1983

More rain in a single day than San Jose usually gets in the whole month of April (typical April total about 1.2 in).

The three most extreme on record

1 80.00 in Apr 6, 1983

2 80.00 in Apr 7, 1983

3 80.00 in Apr 8, 1983

⛄ Most snow in one day

0.5 in Feb 5, 1976

Top recorded days

1 0.5 in Feb 5, 1976

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 Jose's record heat sits well above even a hot day for the season — June's 109°F is about 29°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 Jose's warmest days reach the low 80s°F and its coldest nights drop to the low 40s°F. But across the record it has gone as high as 109°F and as low as 5°F. A single day has delivered over 80 inches of rain or close to 1 inches of snow. 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 Los Gatos (NOAA GHCN station USC00045123), about 13 km from the city centre.

How we build these numbers →

← San Jose city detail