Denver/ Weather & Environment

Last Sizzle in Denver: 90-Degree Heat Monday Before Stormy Cooldown Rolls In

AI Assisted Icon
Published on September 14, 2026
Last Sizzle in Denver: 90-Degree Heat Monday Before Stormy Cooldown Rolls InSource: Johannes Plenio / Unsplash

Denver is squeezing in one more hot Monday before a sharp cooldown reshapes the rest of the week. Skies will turn partly sunny, temperatures should reach near 90 degrees, and a few afternoon showers or thunderstorms could interrupt otherwise warm plans.

One More 90-Degree Afternoon

Monday starts with mostly clear to partly cloudy skies, then warms quickly through the afternoon. The chance of rain is about 20%, with showers and thunderstorms most likely later in the day, according to the National Weather Service Denver/Boulder.

Most rain should be light, but the weather office expects isolated to scattered activity across parts of the Front Range. Stronger winds are possible near the foothills and in Boulder, where occasional gusts could make patio furniture, umbrellas and other loose objects suddenly less cooperative.

Tuesday Brings A Noticeable Cooldown

A cold front moves across the plains Monday night, sending Tuesday's high down to around 75 degrees with an overnight low near 54. The day should be partly sunny, with only a slight chance of showers or thunderstorms after 3 p.m. and east-northeast winds of 6 to 10 mph.

Thursday Has The Best Chance Of Rain

Temperatures rebound Wednesday, when Denver could reach about 85 degrees, but unsettled weather becomes more likely later in the week. Thursday currently carries the strongest rain signal, with a 60% chance of showers and thunderstorms, a high around 90 and the possibility of locally heavy rain.

Showers and thunderstorms remain possible Friday and Saturday, with highs in the lower 90s and 80s, respectively. Sunday should be sunnier and warmer near 80, though another slight chance of afternoon storms remains on the forecast.

No Watches Or Warnings Posted

No watches, warnings or advisories are posted for Denver in the current forecast. Monday's warmth may be the headline, but anyone planning outdoor activities should keep an eye on the sky later in the afternoon and be ready to move indoors if thunder develops.

Denver-Weather & Environment