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September 2026 will be remembered as the month that put an exclamation point on an extraordinary water year of heat and dryness in Boulder, with less than 20% of normal precipitation falling during the month and temperatures more than five degrees above average. Despite a strong late-season monsoon, moisture largely avoided the Front Range, and especially Boulder County, culminating with a great modeling collapse of a significant rain event in the final days of the month tied to the remnants of Hurricane Polo.
Here’s a graphical look at how September 2026 unfolded across Boulder, Denver, and the Front Range — and how it compared to climatology.
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Boulder just endured its driest water year on record, closing out twelve months with only 10.65 inches of precipitation — barely half of normal and nearly at desert-level. From a failed snow season to record spring warmth and a monsoon that largely bypassed the city, every season conspired to keep Boulder locked in a warm‑and‑dry feedback loop. Reservoirs and upstream snow storage will cushion the blow for now, but the bigger question looms: what happens if we start stringing years like this together?
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A broad, slow‑moving heat dome has settled over the West, delivering a run of persistent October warmth to the Front Range — but this quiet, summerlike stretch won’t hold forever. This week will be defined by record‑challenging heat aided by downslope flow, and only the faintest chances for a few stray rain showers before a major pattern shake‑up arrives early next week. Ensemble guidance hints at everything from long‑awaited rainfall to the season’s first frost, with even a few early‑season snow scenarios lurking in the spread. Read on for all the details.
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