Category: Climatology (Page 2 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.

August 2025 Graphical Weather Review: A hot, dry & smoky month saved by a cool & rainy finish

September 26, 2025 / BoulderCAST Team

August 2025 was on track to be our third scorcher in a row — hot, dry, and smoky — until a late-month shift brought in a welcome stretch of cooler, wetter weather. That pattern change helped balance things out across the Front Range, with most areas landing close to average for rainfall and just slightly warmer than normal overall. Still, it wasn’t all relief: the month packed in plenty of wildfire smoke and a few record-breaking heat days that served to remind us that summer wasn’t done yet. Here’s a quick and colorful graphical recap of our weather during August and how it relates to climatology.

NOTE: This monthly recap was delayed due to missing data in the August 2025 climate record for Boulder which has since been partially filled with best-guess approximations.

Premium BoulderCAST Daily – Wed 09/24/25 | More than 1″ of rain for everyone yesterday, but we dry out the rest of the week

September 24, 2025 / Ben Castellani

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This Week in Colorado Weather: September 22, 2025

September 22, 2025 / Andy

This week’s weather kicks off with a dramatic autumn shift—widespread rain, clouds, and a serious temperature drop that will bring snow to the High Country. A strong cold front and upper-level system will make Tuesday feel more like late October, with highs stuck in the lower 50s. But don’t worry, sunshine and warmth are on the horizon again. By midweek, we’ll rebound into the 60s and maybe even flirt with 80 by Friday. Curious about how much soaking rain we’ll get—or where that snow might land? Read on for all the details.

This Week in Colorado Weather: September 15, 2025

September 15, 2025 / Ben Castellani

After a sunny and warm start to the week, the Front Range will trade blue skies for gray as a sluggish low-pressure system settles into northeast Colorado for several days. Rain chances build Tuesday and linger through Thursday, with well below normal temps and a few rounds of storms in the mix. But don’t expect a soaking: rainfall totals may vary widely, with the heaviest action likely landing northeast of Boulder and Denver towards Nebraska. The storm exits sometime Thursday leaving behind drier and warmer weather for the weekend.

Premium This Weekend in Colorado Weather: Trending somewhat cooler and wetter as a Pacific trough clips Colorado — and yes there will be Mountain snow!

September 11, 2025 / Ben Castellani

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This Week in Colorado Weather: September 8, 2025

September 8, 2025 / Ben Castellani

Last week’s cold front didn’t just drop temperatures—it dragged in a wall of chemical-scented smoke that turned the Front Range skies hazy and acrid. The days ahead are shaping up to be much more pleasant with warmer temps, limited storm chances, and a break from the smoke (at least for now) under southwest flow. Read on for a full breakdown of this week’s weather, including when to expect the best shot at rain and whether any smoke may return in the extended.

Colorado Forecast Update: Thursday evening’s smoky front will usher in cooler, (slightly) wetter weather for the weekend

September 4, 2025 / BoulderCAST Team

Thursday’s shaping up to be a busy weather day across the Front Range. We’re looking at hot temperatures, gusty winds, and a cold front arriving by evening that’ll bring a noticeable drop in temps — along with a wave of wildfire smoke. We’ll walk through what to expect today, how the weekend is shaping up, and whether any moisture from Hurricane Lorena might sneak into the region.

This Week in Colorado Weather: September 1, 2025

September 1, 2025 / Andy

September kicks off with a mellow vibe across the Front Range — warm days and mostly dry skies are expected. But don’t let the quiet start fool you. Between drifting wildfire smoke, sneaky cold fronts, and a potential tropical system by the weekend, there’s more nuance in our forecast this week than meets the eye. Read on as we break down what to expect day by day, plus what might shake things up by the weekend.