Brownsville Experiences Hottest September on Record

[donsutherland1]

Through 2018, just only 2005 (5th hottest at the time) and 2015 (9th hottest at the time) ranked among Texas' ten hottest Septembers on record. The monthly mark of 80.7° from 1911 stood at the top, challenged only by 1931 (80.5°). All other years were more than 0.5° or more cooler. Then, in 2019, Texas recorded a monthly average temperature of 81.5°. Four years later, that mark was eclipsed with an 81.8° average. Preliminary data suggests that 2026 smashed the 2023 record, potentially by more than 1°.

Preliminary Texas September Anomalies:

Numerous cities established monthly records in Texas. Some stations set new records by large margins. Brownsville registered its third warmest month on record, less than 0.1° cooler than August 2026, which ranked second. McAllen, powered by a record stretch of 100° days, which reached 70 days on September 30th, experienced its second warmest month on record.

Brownsville rewrote large parts of its September record book. It even tied its all-time record high minimum temperature of 85° on September 13th and then again on September 30th. Prior to 2026, Brownsville's latest 85° minimum temperature occurred on August 6, 1896. 2026 also became the first year with two such low temperatures.

Brownsville also recorded its hottest two-month and three-month periods on record:

2-Month: August-September 2026: 89.8° (old record: July-August 2023: 89.4°)

3- Month: July-September 2026: 89.3° (old record: July-September 2023: 89.1°)

[GaWx]

Tulsa, OK, was 84.3 F in Sep ‘26, which was in addition to being 10.1 warmer than the longterm Sep mean:

- 2.4 warmer than its 2nd warmest Sep

- 1.4 warmer than its longterm mean for July

- warmer than 69% of Julys, 74% of Augusts, and 98% of Junes on record (records back to 1905)

@donsutherland1