St. Louis Braces for Extended Warm Spell Into Next Week
St. Louis is experiencing warm September temperatures, with highs in the upper 80s expected on Sunday and even hotter conditions anticipated into the workweek. Lows overnight will be in the 60s, with a slight chance of spot showers on Monday…

St. Louis, MO, September 13, 2026 — St. Louis is set to experience a prolonged period of warm weather as September continues, with temperatures expected to climb into the upper 80s on Sunday and even higher into the upcoming workweek.
Residents of St. Louis can anticipate above-average temperatures for this time of year. Highs on Sunday are projected to reach the upper 80s Fahrenheit. This warm trend is expected to persist and intensify as the workweek begins, indicating a significant departure from typical September conditions.
Overnight temperatures will offer little relief from the heat, with lows anticipated to remain in the 60s. While the majority of the week is expected to be dry, there is a slight possibility of isolated showers on Monday morning. Meteorologists are monitoring the situation for any significant changes to the forecast, but the current outlook points towards continued warmth.
The extended warm spell highlights a noticeable shift in the weather pattern for the region. Further details regarding the duration and peak temperatures of this heatwave will likely be provided as the week progresses. Residents are advised to stay informed about the latest weather updates from local authorities and meteorological services.
Story summarized from the original created by Jaime Travers on fox2now.com, see more information here.
