September was an exceptionally warm month in the Front Range, with most areas landing more than four degrees above average. This was our fourth consecutive month that finished on the north side of normal. Outside of a single soaking rain event, the month was also extremely dry with drought expanding further across the area. Here’s a quick and colorful graphical recap of our weather during September and how it relates to climatology.
September 2024 Temperatures:
September 2024 Precipitation:
September 2024 Snowfall:
2024 90-degree day count timeline
How does September 2024 fit into the last 74 years?
How does September 2024 fit into the last 12 months?
Latest Drought Tracker (as of September 24th)
Our top posts of September 2024
September 2024 retold via our Twitter X timeline
NOTICE: We are now on Threads! Come follow us there, too!
Happy 🌞-day! #cowx pic.twitter.com/CTX8wHnbgg
— BoulderCAST Weather 🏔️❄️ (@BoulderCAST) September 1, 2024
There was a light dusting of snow above treeline last night in Colorado's highest mountains. This is not that uncommon for this time of year. Autumn is near… #COWX pic.twitter.com/wFsWAFxhHz
— BoulderCAST Weather 🏔️❄️ (@BoulderCAST) September 5, 2024
September 5th is one of the final few days in a long streak of summer dates where it has never snowed in #Boulder's recorded history. Thanks to 2020's winter blast in late summer, this climatological streak ends this upcoming weekend! #COWX pic.twitter.com/rc41iqMrzq
— BoulderCAST Weather 🏔️❄️ (@BoulderCAST) September 5, 2024
Happy 🌞 -day from the base of America's mountain! #cowx pic.twitter.com/9tbiQQ7rlw
— BoulderCAST Weather 🏔️❄️ (@BoulderCAST) September 8, 2024
Crepuscular rays accompanying this morning's sunrise in #Boulder! #COWx 📸: Sandy D pic.twitter.com/xy1co0jXkn
— BoulderCAST Weather 🏔️❄️ (@BoulderCAST) September 10, 2024
Busy times ahead! The best chance of rain for the week is TODAY, while THURSDAY will shift gears to high fire danger and near-record heat. Hurricane Francine hits Louisiana. This & more in today's *Premium* discussion –> https://t.co/LvQXALxYti #COwx #Colorado #Denver #Boulder pic.twitter.com/qbKUfqmoVm
— BoulderCAST Weather 🏔️❄️ (@BoulderCAST) September 11, 2024
California wildfire smoke is flooding into Colorado tonight. Smoke will be thickest on Friday but should clear out somewhat heading into the weekend. #cowx #smoke pic.twitter.com/8c4QoeAO6e
— BoulderCAST Weather 🏔️❄️ (@BoulderCAST) September 13, 2024
The Flatirons hit different when returning home after a long trip. Every time. #Boulder #cowx 🥰 pic.twitter.com/wWvwx6gCsT
— BoulderCAST Weather 🏔️❄️ (@BoulderCAST) September 15, 2024
Slight chance to see aurora late Sunday night in northern Colorado after midnight. Skies are expected to clear out later this evening but the moon is about 3/4 full. Not ideal conditions all around, but keep an eye out on the far northern horizon if you're feeling lucky and… pic.twitter.com/aeFlJznp7E
— BoulderCAST Weather 🏔️❄️ (@BoulderCAST) September 15, 2024
⚠️Watch out for a line of severe thunderstorms coming off the terrain this afternoon with wind gusts up to 60 MPH. Also the chance of a soggy weekend is increasing for the Front Range ⛈️
This & more in today's *Premium* Front Range weather discussion: https://t.co/0tuCVDXwBS… pic.twitter.com/jws6BS0TlQ
— BoulderCAST Weather 🏔️❄️ (@BoulderCAST) September 17, 2024
Tuesday's windy storms did not meet the criteria to be classified as a #derecho, but it was impressive nonetheless w/ widespread severe gusts (58+ MPH) & even a few gusts over 90 MPH. The broken line of severe storms stretched more than 1000 miles from Canada to Mexico! #COWx pic.twitter.com/OjxFs7Eun2
— BoulderCAST Weather 🏔️❄️ (@BoulderCAST) September 18, 2024
📉 Most modelling is trending way far south now for the soaking rains this weekend. Still plenty of uncertainty as the storm is still out over the Pacific Ocean near California, but optimism for 0.5"+ of Front Range rainfall is rapidly declining…. #COwx #Colorado #Drought… pic.twitter.com/fruJ7XfTwJ
— BoulderCAST Weather 🏔️❄️ (@BoulderCAST) September 18, 2024
It's not even a debate: 80° days and 45° nights are the pinnacle of Colorado weather 😍 #COWX #Colorado
— BoulderCAST Weather 🏔️❄️ (@BoulderCAST) September 20, 2024
Colorado Forecast Update: Widespread rain inbound for Boulder & Denver this weekend, several inches of snow for the Mountains ☔️🏔️
How cold will it be & where will it snow? Which areas are favored for 1"+ of rain? Let's discuss–> https://t.co/VNlV0hFCzE #COWx #Colorado #Denver pic.twitter.com/Q0UsmLUKrj
— BoulderCAST Weather 🏔️❄️ (@BoulderCAST) September 20, 2024
Raindrops have arrived! #cowx pic.twitter.com/WhdQ7XACUU
— BoulderCAST Weather 🏔️❄️ (@BoulderCAST) September 22, 2024
☃️ And yes it did snow "up the hill" overnight. Accumulating snow occurred as low as ~8400 feet in western Boulder County. 1-4" has fallen in the higher mountains like Pikes Peak and Berthoud Pass. #COWX pic.twitter.com/ZAOcl8NkCb
— BoulderCAST Weather 🏔️❄️ (@BoulderCAST) September 22, 2024
Our best rain since April in the Front Range — 16+ straight hours! Drink up, Colorado! #COWx pic.twitter.com/49B2W7GO6o
— BoulderCAST Weather 🏔️❄️ (@BoulderCAST) September 22, 2024
This Week in Colorado Weather: Almost as Exciting as Watching Paint Dry… Almost! ☀️🎨🥵
The start of the work week will be relatively cool. However, a strong ridge pattern known as an omega block will bring warm & dry conditions from Wednesday onwards, with temperatures rising… pic.twitter.com/t5fR9eksan
— BoulderCAST Weather 🏔️❄️ (@BoulderCAST) September 23, 2024
Significant land falling hurricane looking quite likely on Thursday in Florida following rapid intensification of PTC #9 pic.twitter.com/ldJ6QUj3uR
— BoulderCAST Weather 🏔️❄️ (@BoulderCAST) September 24, 2024
🥵#Boulder has a chance to break record highs three out of the next four days! Is this the last hurrah of 90s for the year? Let's hope so! #COWX #Boulderwx pic.twitter.com/l69o4bivYK
— BoulderCAST Weather 🏔️❄️ (@BoulderCAST) September 26, 2024
The Euro model seems to be broken this morning. Not a single one of 50 ensemble members indicates any precipitation in the Front Range for the next 144 hours.
*Double-checks other model guidance*
Son of a … 🏜️ #COWX pic.twitter.com/4KhP7G6Pyp
— BoulderCAST Weather 🏔️❄️ (@BoulderCAST) September 27, 2024
What a lovely first week of autumn we are having in Colorado! #COWx #Boulder #Boulderwx pic.twitter.com/QdIRp8Zzi6
— BoulderCAST Weather 🏔️❄️ (@BoulderCAST) September 27, 2024
#Helene continues to rapidly intensify with landfall imminent in 2-3 hours along the Panhandle of Florida.
Cat 4
130 MPH sustained winds
945 millibar central pressure and fallingThe storm is also speeding up which will spread hurricane-force winds well inland#FLwx #NotCOwx https://t.co/iYEt7yeJrx pic.twitter.com/z5QBTgkCSk
— BoulderCAST Weather 🏔️❄️ (@BoulderCAST) September 26, 2024
This Week in Colorado Weather: Up and down temperatures, but sadly still NO precipitation 🚫☔️📈
This week's weather will once again be excruciatingly quiet in the Front Range –> https://t.co/P3dCIJR2q3 #COwx #Denver #Colorado #COsnow #Boulder #Drought #DenverWeather pic.twitter.com/VRBd42FBOo
— BoulderCAST Weather 🏔️❄️ (@BoulderCAST) September 30, 2024
📉 10:15AM Update: A gusty cold front is working south across the Denver area now. It'll be through everyone's location before lunchtime. Look for ~10-15°F temperature drop and gusty northeast winds of 10-20 MPH. Daytime heating will offset the temperature drop a bit. #COWX pic.twitter.com/NKNquEv3Uj
— BoulderCAST Weather 🏔️❄️ (@BoulderCAST) September 30, 2024
Wow it is absolutely lovely outside right now! #cowx pic.twitter.com/kXqQfNCGH1
— BoulderCAST Weather 🏔️❄️ (@BoulderCAST) September 30, 2024
☃️ 10th Annual BoulderCAST First Snowfall Contest❄️
Get your guesses in now for a chance to win!
Sift through some historical first snow data and complete the entry form –> https://t.co/1iABPEG03c
#COWx #Denver #Boulder #Boulderwx #Colorado #COsnow #Denverweather #snow— BoulderCAST Weather 🏔️❄️ (@BoulderCAST) September 25, 2024
Spread the word, share Colorado weather:
Go Premium, get all the perks.
Daily Forecast Updates
Get our daily forecast discussion every morning delivered to your inbox.
All Our Model Data
Access to all our Colorado-centric high-resolution weather model graphics. Seriously — every one!
Ski & Hiking Forecasts
6-day forecasts for all the Colorado ski resorts, plus more than 120 hiking trails, including every 14er.
Smoke Forecasts
Wildfire smoke concentration predictions up to 72 hours into the future.
Exclusive Content
Weekend outlooks every Thursday, bonus storm updates, historical data and much more!
No Advertisements
Enjoy ad-free viewing on the entire site.
You must be logged in to post a comment.