Tulsa hit 100°F or higher on 35 days this summer, more than triple the city's average and the most triple-digit days since 2012.

The tally ranks 13th since record-keeping began in 1905, KJRH meteorologist Mike Grogan reported Monday, Sept. 21. It ties 1916 and falls short of 2011 (44 days) and 2012 (38 days), the two most recent summers to top it.

September alone has been historic. By average temperature, it is the hottest September on record for Tulsa, beating 1939 by 3 degrees, according to Grogan. The month produced nine triple-digit days through Sept. 21, one shy of the September record of 10 set in 1939.

The highest temperature recorded in Tulsa this September was 105°F, Grogan reported in a Sept. 14 recap. On Sept. 9, the city reached 103°F, breaking a daily record that had stood since 1909. Four overnight lows in September set records at Tulsa International Airport, including an 83°F reading that was the warmest September low ever recorded in Tulsa.

Grogan noted the triple-digit count was especially striking because a wet end to spring and start to summer increased humidity, which usually limits how often temperatures reach 100°F.

The heat carried real costs. The Emergency Medical Services Authority (EMSA) issued its fourth medical heat alert of the year by Sept. 1, and more patients had been hospitalized for heat-related illness in 2026 than in 2024 and 2025 combined, according to the Tulsa World. Oklahoma recorded its third-hottest August on record.

Schools felt it too. As of Aug. 31, 62 Tulsa Public Schools sites were reporting HVAC issues affecting classrooms, with about 185 open work orders, according to the Tulsa Flyer.

In Broken Arrow, the city bought 40 CamelBak hydration packs for trash workers at about $15 each so crews could carry water on their routes. "It has been an awesomely hot summer," Solid Waste and Recycling Director Jerry Schuber told KJRH on Aug. 27. "We've had a lot of exposure with the heat, so what we did was we ordered some camelbacks."

NWS Tulsa said on X on Sunday, Sept. 20, that cooler weather was expected by midweek, signaling relief was on the way.

The latest date Tulsa has ever reached 100°F is Sept. 28, 1953. Whether 2026 adds to its total depends on whether the city hits triple digits again before that mark.