What is the hottest day ever recorded in Houston?

Houston's hottest day on record reached 109°F, set on August 27, 2023. That is the single most extreme high in the nearest long-term weather station's full daily record — about 29°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 Houston?

The all-time record high in Houston is 109°F, recorded on August 27, 2023. 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 Houston?

Houston's coldest day on record bottomed out at 5°F, set on January 23, 1940. 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 Houston?

The all-time record low in Houston is 5°F, recorded on January 23, 1940. The gap between that and the 109°F record high — a span of 104°F — is the full range of temperatures Houston has experienced across its long-term daily record.

Is it normal to be this hot in Houston?

It depends on how far above Houston's normal a given day runs. A typical year here averages a daily high near 80°F; the all-time record of 109°F (set 2023) sits about 29°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 Houston set its temperature records?

Houston's record high of 109°F was set in 2023 (August 27, 2023), and its record low of 5°F in 1940 (January 23, 1940). Both are pulled from the station's full daily record going back to 1930, so they reflect the true extremes rather than a recent or partial sample.

Has Houston been getting hotter?

Yes — Houston's annual mean temperature has trended about 3.8°F warmer since 1931 (+0.40°F per decade, fitted to the complete years of 1931–2025). 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.

Houston, Texas Weather Records

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

Houston’s all-time temperature records

Hottest day on record: 109°Fset August 27, 2023
Coldest day on record: 5°Fset January 23, 1940

That is a 104°F span between the hottest and coldest days Houston has ever recorded — the full range of what its weather has done across the station’s record back to 1930.

Houston, TX · Today vs. normal

6°F above typical for 9:15 AM on Sep 21

At 9:15 AM CDT on Sep 21 it was 82°F in Houston — 6° above the 76°F typical for that hour (estimated from the Sep 21 normal high of 88°F and low of 71°F, interpolated from the monthly normals).

How extreme Houston’s weather gets

Houston’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 89°F. The records sit well outside that everyday range. The hottest day on record reached 109°F in 2023 — roughly 29°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, Houston has bottomed out at 5°F (1940). 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 109°F record is the rare event the record marks.

Frequently asked

What is the hottest day ever recorded in Houston?: Houston's hottest day on record reached 109°F, set on August 27, 2023. That is the single most extreme high in the nearest long-term weather station's full daily record — about 29°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 Houston?: The all-time record high in Houston is 109°F, recorded on August 27, 2023. 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 Houston?: Houston's coldest day on record bottomed out at 5°F, set on January 23, 1940. 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 Houston?: The all-time record low in Houston is 5°F, recorded on January 23, 1940. The gap between that and the 109°F record high — a span of 104°F — is the full range of temperatures Houston has experienced across its long-term daily record.
Is it normal to be this hot in Houston?: It depends on how far above Houston's normal a given day runs. A typical year here averages a daily high near 80°F; the all-time record of 109°F (set 2023) sits about 29°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 Houston set its temperature records?: Houston's record high of 109°F was set in 2023 (August 27, 2023), and its record low of 5°F in 1940 (January 23, 1940). Both are pulled from the station's full daily record going back to 1930, so they reflect the true extremes rather than a recent or partial sample.
Has Houston been getting hotter?: Yes — Houston's annual mean temperature has trended about 3.8°F warmer since 1931 (+0.40°F per decade, fitted to the complete years of 1931–2025). 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.