Temperatures climbed well above typical early September levels. The heat was particularly notable in certain areas, with McAllen reaching 104°F and Harlingen hitting 100°F. These temperatures exceeded the normal highs for these areas, with McAllen's normal being 96° and Harlingen's average being 94°. Brownsville also experienced triple-digit heat.

Further details on the unseasonable heat are available from ValleyCentral. The high temperatures did not break any records, but still marked a significant departure from usual early September weather.

The full extent of the heat's impact is not specified, but it is clear that the Rio Grande Valley experienced an unusually hot day.