What is the hottest day ever recorded in San Jose?

San Jose's hottest day on record reached 106°F, set on June 14, 2000. That is the single most extreme high in the nearest long-term weather station's full daily record — about 37°F hotter than a typical year's average high of 69°F, which is why a day like it stands out as genuinely rare rather than just a hot afternoon.

What is the record high temperature in San Jose?

The all-time record high in San Jose is 106°F, recorded on June 14, 2000. Records are drawn from the nearest long-term weather station's full daily history, so this is the hottest single day the station has ever logged — not a typical summer peak.

What is the coldest day ever recorded in San Jose?

San Jose's coldest day on record bottomed out at 21°F, set on January 5, 1949. Like the record high, it comes from the station's full daily record, so it captures the most extreme cold the area has recorded rather than an average winter low.

What is the record low temperature in San Jose?

The all-time record low in San Jose is 21°F, recorded on January 5, 1949. The gap between that and the 106°F record high — a span of 85°F — is the full range of temperatures San Jose has experienced across its long-term daily record.

Is it normal to be this hot in San Jose?

It depends on how far above San Jose's normal a given day runs. A typical year here averages a daily high near 69°F; the all-time record of 106°F (set 2000) sits about 37°F above that. When a live reading is available, the live readout just below the record high and low compares it with the temperature typical for that hour this month (estimated from the month's normal high and low), so you can see how unusual the day is rather than guessing.

When did San Jose set its temperature records?

San Jose's record high of 106°F was set in 2000 (June 14, 2000), and its record low of 21°F in 1949 (January 5, 1949). Both are pulled from the station's full daily record going back to 1945, so they reflect the true extremes rather than a recent or partial sample.

Has San Jose been getting hotter?

Yes — San Jose's annual mean temperature has trended about 4.6°F warmer since 1946 (+0.58°F per decade, fitted to the complete years of 1946–2025). That gradual shift in the average is separate from the all-time records above, which mark the single most extreme days rather than the trend, but a warming baseline is part of why recent years more often brush up against the record-high end.

San Jose, California Weather Records

The hottest and coldest days San Jose has ever recorded — and how today compares to normal

San Jose’s all-time temperature records

Hottest day on record: 106°Fset June 14, 2000
Coldest day on record: 21°Fset January 5, 1949

That is a 85°F span between the hottest and coldest days San Jose has ever recorded — the full range of what its weather has done across the station’s record back to 1945.

San Jose, CA · Today vs. normal

8°F below typical for 10:30 PM on Sep 20

At 10:30 PM PDT on Sep 20 it was 59°F in San Jose — 8° below the 67°F typical for that hour (estimated from the Sep 20 normal high of 77°F and low of 57°F, interpolated from the monthly normals).

How extreme San Jose’s weather gets

San Jose’s weather is usually mild by its own standards — a typical year averages a daily high near 69°F, and the normal high for September runs about 78°F. The records sit well outside that everyday range. The hottest day on record reached 106°F in 2000 — roughly 37°F above a typical year’s average high, the kind of gap that turns an ordinary summer into a genuine heat event.

At the other end, San Jose has bottomed out at 21°F (1949). Those edges are why the today-versus-normal readout above is worth a glance: it shows where today falls between the normal and the record, so a hot afternoon can be judged against the real history rather than a hunch. A reading a few degrees over the September normal is ordinary; one pushing toward the 106°F record is the rare event the record marks.

Frequently asked

What is the hottest day ever recorded in San Jose?: San Jose's hottest day on record reached 106°F, set on June 14, 2000. That is the single most extreme high in the nearest long-term weather station's full daily record — about 37°F hotter than a typical year's average high of 69°F, which is why a day like it stands out as genuinely rare rather than just a hot afternoon.
What is the record high temperature in San Jose?: The all-time record high in San Jose is 106°F, recorded on June 14, 2000. Records are drawn from the nearest long-term weather station's full daily history, so this is the hottest single day the station has ever logged — not a typical summer peak.
What is the coldest day ever recorded in San Jose?: San Jose's coldest day on record bottomed out at 21°F, set on January 5, 1949. Like the record high, it comes from the station's full daily record, so it captures the most extreme cold the area has recorded rather than an average winter low.
What is the record low temperature in San Jose?: The all-time record low in San Jose is 21°F, recorded on January 5, 1949. The gap between that and the 106°F record high — a span of 85°F — is the full range of temperatures San Jose has experienced across its long-term daily record.
Is it normal to be this hot in San Jose?: It depends on how far above San Jose's normal a given day runs. A typical year here averages a daily high near 69°F; the all-time record of 106°F (set 2000) sits about 37°F above that. When a live reading is available, the live readout just below the record high and low compares it with the temperature typical for that hour this month (estimated from the month's normal high and low), so you can see how unusual the day is rather than guessing.
When did San Jose set its temperature records?: San Jose's record high of 106°F was set in 2000 (June 14, 2000), and its record low of 21°F in 1949 (January 5, 1949). Both are pulled from the station's full daily record going back to 1945, so they reflect the true extremes rather than a recent or partial sample.
Has San Jose been getting hotter?: Yes — San Jose's annual mean temperature has trended about 4.6°F warmer since 1946 (+0.58°F per decade, fitted to the complete years of 1946–2025). That gradual shift in the average is separate from the all-time records above, which mark the single most extreme days rather than the trend, but a warming baseline is part of why recent years more often brush up against the record-high end.