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This Week in Colorado Weather: September 21, 2026

Despite an active monsoon that refuses to quit, Boulder has remained stubbornly dry with just 18% of normal precipitation during September which has been anything but typical. This week will keep the theme alive: plenty of monsoon flow, impressive moisture surges, and even a pair of dancing hurricanes in the Eastern Pacific, yet northern Colorado will still struggle to squeeze out meaningful rainfall again. We break down why the pattern looks so active on paper, why the Front Range keeps missing out, and what late‑week changes might finally nudge storm chances upward.

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Premium BoulderCAST Daily – Sun 09/20/26 | Trending Drier and a Bit Warmer into Midweek

Aweak cold front will drop down tonight from Wyoming as low pressure tracks into the Midwest later today and tonight. This front has a limited amount of cold advection with it, but just enough convergence along the boundary to warrant a few isolated to scattered storms. We should see a cool Sunday and Monday with temperatures in the middle 70s. …

Premium BoulderCAST Daily – Sat 09/19/26 | A dual threat of severe storms and heavy rainfall today and Sunday

Athreat of showers and storms, some being severe, will be possible both today and Sunday. A stalled frontal boundary will be draped north to south from the Wyoming border into eastern Colorado through the weekend. Scattered showers and storms are expected this afternoon and evening, with a simulated radar depiction below from the HRRR. Highs will top out in the …

Premium BoulderCAST Daily – Fri 09/18/26 | Showers and embedded storms remain in the forecast through Saturday

Although the Front Range has not seen much in the way of measurable rainfall, we will continue to see rain chances in the forecast through the upcoming weekend, front-loaded to today and Saturday. The GEFS and other guidance continue to highlight this potential, specifically this afternoon/evening and Saturday. This is due to continued well above average moisture, with precipitable water …

Premium This Weekend in Colorado Weather: Record Atmospheric Moisture Overhead, But Will There Be Storms?

Rainfall totals so far have been predictably unimpressive, with most lower-elevation locations picking up just a trace to around 0.10". The Foothills of Boulder, Gilpin, and Clear Creek Counties have done somewhat better, with localized totals approaching 0.50". Denver International Airport (DIA) has yet to record a drop, while Boulder has measured just 0.07" from several rounds of light showers …

Premium BoulderCAST Daily – Wed 09/16/26 | Another Tropically-Infused Setup That Likely Underperforms in the Denver Area

Yesterday's taste of fall was lovely wasn't it?! Highs only managed the low to mid 70s across the lower elevations, with Foothills spots stuck in the 60s. It was our coolest day since August 4th, but that refreshing break is already fading as we slide right back into above normal warmth today. Deep subtropical moisture continues pumping into the Four …

Premium BoulderCAST Daily – Tue 09/15/26 | Much Cooler Today, But the Stable Air Keeps Us Mostly Dry Again

The cold front slid through right on schedule around 2:00 AM, marked by a clean surge of gusty north winds and a switch to cooler upslope flow. Temperatures across the entire Urban Corridor are running 10–15° colder this morning compared to the record‑warm overnight readings we logged early Monday. A broad deck of low stratus is draped over Boulder and …

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