Denver is sweltering in September, at least for the last two consecutive record-setting days.

The mercury hit 93 degrees at 1:38 p.m., at Denver International Airport, toppling a record-setting 92-degree mark for this date that had stood in Denver since 1956, said Kyle Fredin, a National Weather Service spokesman.

On Sunday Denver’s high temperature of 96 degrees crushed the previous mark for Sept. 19 — 93 degrees — set in 1980.

The record-setting heat, fueled by low humidity and gusty winds, has created perilous fire conditions for a wide swath of the state, including all of northeastern and north central Colorado.

A “red flag warning” posted by the weather service for areas under extreme fire conditions includes portions of the metro area surrounding Denver. Parts of Adams, Arapahoe, Boulder, Douglas and Jefferson counties are under the warning through 9 p.m. tonight.

A slight chance of thunderstorms today will bring little, if any, rain, the weather service warns. Winds up to 50 mph with the storms could spark new fires.

Weather in and around Denver is expected to cool down on Tuesday, with the forecast high temperature for the city tomorrow penciled in at 82 degrees.

Kieran Nicholson: 303-954-1822 or knicholson@denverpost.com.