What is the hottest day ever recorded in San Antonio?

San Antonio's hottest day on record reached 111°F, set on September 5, 2000. That is the single most extreme high in the nearest long-term weather station's full daily record — about 31°F hotter than a typical year's average high of 80°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 Antonio?

The all-time record high in San Antonio is 111°F, recorded on September 5, 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 Antonio?

San Antonio's coldest day on record bottomed out at 0°F, set on January 31, 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 Antonio?

The all-time record low in San Antonio is 0°F, recorded on January 31, 1949. The gap between that and the 111°F record high — a span of 111°F — is the full range of temperatures San Antonio has experienced across its long-term daily record.

Is it normal to be this hot in San Antonio?

It depends on how far above San Antonio's normal a given day runs. A typical year here averages a daily high near 80°F; the all-time record of 111°F (set 2000) sits about 31°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 Antonio set its temperature records?

San Antonio's record high of 111°F was set in 2000 (September 5, 2000), and its record low of 0°F in 1949 (January 31, 1949). Both are pulled from the station's full daily record going back to 1946, so they reflect the true extremes rather than a recent or partial sample.

Has San Antonio been getting hotter?

Yes — San Antonio's annual mean temperature has trended about 2.9°F warmer since 1947 (+0.37°F per decade, fitted to the complete years of 1947–2025). 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 Antonio, Texas Weather Records

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

San Antonio’s all-time temperature records

Hottest day on record: 111°Fset September 5, 2000
Coldest day on record: 0°Fset January 31, 1949

That is a 111°F span between the hottest and coldest days San Antonio has ever recorded — the full range of what its weather has done across the station’s record back to 1946.

San Antonio, TX · Today vs. normal

8°F above typical for 9:15 AM on Sep 21

At 9:15 AM CDT on Sep 21 it was 82°F in San Antonio — 8° above the 74°F typical for that hour (estimated from the Sep 21 normal high of 89°F and low of 68°F, interpolated from the monthly normals).

How extreme San Antonio’s weather gets

San Antonio’s weather is usually mild by its own standards — a typical year averages a daily high near 80°F, and the normal high for September runs about 90°F. The records sit well outside that everyday range. The hottest day on record reached 111°F in 2000 — roughly 31°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 Antonio has bottomed out at 0°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 111°F record is the rare event the record marks.

Frequently asked

What is the hottest day ever recorded in San Antonio?: San Antonio's hottest day on record reached 111°F, set on September 5, 2000. That is the single most extreme high in the nearest long-term weather station's full daily record — about 31°F hotter than a typical year's average high of 80°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 Antonio?: The all-time record high in San Antonio is 111°F, recorded on September 5, 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 Antonio?: San Antonio's coldest day on record bottomed out at 0°F, set on January 31, 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 Antonio?: The all-time record low in San Antonio is 0°F, recorded on January 31, 1949. The gap between that and the 111°F record high — a span of 111°F — is the full range of temperatures San Antonio has experienced across its long-term daily record.
Is it normal to be this hot in San Antonio?: It depends on how far above San Antonio's normal a given day runs. A typical year here averages a daily high near 80°F; the all-time record of 111°F (set 2000) sits about 31°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 Antonio set its temperature records?: San Antonio's record high of 111°F was set in 2000 (September 5, 2000), and its record low of 0°F in 1949 (January 31, 1949). Both are pulled from the station's full daily record going back to 1946, so they reflect the true extremes rather than a recent or partial sample.
Has San Antonio been getting hotter?: Yes — San Antonio's annual mean temperature has trended about 2.9°F warmer since 1947 (+0.37°F per decade, fitted to the complete years of 1947–2025). 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.