Sunday’s record-breaking November heat will give way to a dramatic cooldown on Monday, with temperatures plunging 20 to 30 degrees and wave clouds rolling in over the Front Range. The week ahead stays dry and mostly mild, but a few weak cold fronts will stir up some wind and day-to-day temperature swings. And while the forecast looks quiet for now, ensemble models are starting to hint at a colder, potentially snowier shift next week.
Category: Climatology (Page 1 of 63)
These posts contain information about the long-term weather patterns of Boulder County. Potential topics may include 30-day weather outlooks, El Nino/La Nina, and seasonal forecasts. You will find less about the day-to-day weather, with more focus on longer trends and patterns.
After a stretch of crisp, dry days to end the week, our weather is gearing up for a big warm-up this weekend, with near-record highs favored by Sunday. This developing warm and unfortunately dry pattern looks likely to stick around well into November. With each passing day, the odds grow that Boulder might challenge its record for the latest first snowfall.
Clouds roll in Thursday as a compact storm system approaches from the southwest—but don’t expect much more than a few sprinkles and high mountain snow. Boulder and Denver stay mostly dry, with mild temps in the 60s and a sunnier stretch ahead for Friday and Saturday. A stronger trough will arrive Sunday into early next week, bringing gusty winds and a taste of cooler fall air, but once again little in the way of meaningful rain or snow east of the Mountains. Read on for all the details.
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This week’s forecast is anything but boring in the Front Range. A fast-moving autumn storm is stirring up the atmosphere on Monday with jet-driven Mountain snow, powerful downslope winds, and a fire-weather setup that demands caution. And once the winds die down? A hard freeze will slam the door on the growing season for the entire area Monday night. Read on for a full breakdown of the very active weather unfolding in Colorado on Monday, plus a peek towards the quieter days ahead.
11th Annual BoulderCAST First Snowfall Contest
Ready to toss that first snowball of the season? Maybe you’ve already waxed your skis, shelled out for that pricey Epic Pass, or jumped the gun on snow tires (again). Well, hold onto your mittens—Boulder’s first big snow could be just around the corner, or not! Mother Nature has been playing tricks on us lately. In the past five years alone, we’ve seen both the earliest and latest first snows on record. But, what will 2025 bring? That’s where you come in.
We’re kicking off our annual First Snow Contest! Please take a look at Boulder’s snowfall history within, then submit your best guess for when the first measurable snow (≥0.1″) will fall in Boulder—and how much will accumulate. The closest guesses will win a selection of prizes!
*This contest is now closed to entries*
September 2025 brought a classic Colorado blend to Boulder and the Front Range: near-normal temps, wetter-than-average skies, and a lively mix of sunshine and storms. A standout precipitation event around the 23rd delivered soaking rain in the lowlands and the first real coating of snow to the Mountains. The month eased us gently into autumn, with crisp mornings, comfortable afternoons, and brilliant foliage lighting up the higher terrain. And yes—who could forget that dramatic wave of Canadian wildfire smoke that swept through, reminding us how connected we are to the broader arid landscape of western North America. Here’s a quick and colorful graphical recap of our weather during September and how it relates to climatology.
This week’s weather in the Front Range will be a bit of a rollercoaster. After Sunday night’s soaking rain and snow, Monday kicks off with fog, drizzle, and stubborn clouds before a midweek warm-up brings back the sunshine. But don’t get too cozy: frost season is knocking on the door, and snow signals are starting to flicker in the long-range models. Read on for the full breakdown, including what to expect today, what time rain showers will return later in the day Monday, and when late-season gardeners should start watching for frost and snowflakes.
P.S. Don’t forget to submit your entry to our 2025 First Snow Contest which closes Tuesday night at midnight!
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