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Colorado Heatwave End Date: Exact Cool-Down Timeline Revealed
Denver’s Extended Heat Wave: What You Need to Know
The Current Heat Situation
Imagine stepping outside and feeling like you’ve walked into an oven. That’s what Denver residents are facing for the next 10 to 14 days. Here’s the simple breakdown:
- Temperatures will stay at or above 90°F for almost two weeks straight
- This weekend (Sunday and Monday) could spike near 100°F
- If Denver hits 100°F, it would be the fourth time this year reaching that extreme mark
- The 9NEWS Weather Impact Team (that’s the local weather experts) says this is a serious stretch of hot weather
IMPORTANT POINT: HEAT ALERT ACTIVE
The 9NEWS Weather Impact Team has issued a Weather Impact Alert for Sunday and Monday. A Heat Advisory may also be in effect. This means the heat isn’t just uncomfortable—it could be dangerous for some people.
The One-Day Break
Good news: Tuesday brings a tiny vacation from the heat!
- A cold front (a mass of cooler air) moves in
- Skies will be cloudy
- Highs only reach the 80s — that’s 10+ degrees cooler!
- Enjoy it while it lasts — this is the only break in the forecast through mid-August
Looking Ahead: Fall Is Coming!
Even though it feels like summer will last forever, meteorologist Chris Bianchi reminds us that autumn is closer than you think. Here’s your countdown to cooler days:
| Milestone | Date | Days Away |
|---|---|---|
| Earliest measurable snowfall ever recorded | Sept. 3, 1961 | ~35 days |
| Average high temperature drops below 80°F | Sept. 17 | ~49 days |
| Official first day of fall | Sept. 22 | ~54 days |
| Average first freeze (32°F) | Oct. 7 | ~70 days |
| Average first measurable snowfall | Oct. 18 | ~80 days |
METEOROLOGIST’S NOTE
"We’re obviously in the heart of summer, but we’re not that far away from some of those meaningful, kind of crisper fall days ahead," says Chris Bianchi. Cooler weather typically arrives in September and October.
How to Stay Safe During Extreme Heat
IMPORTANT SAFETY REMINDER
Heat this intense isn’t just uncomfortable—it can be dangerous. Please take these steps seriously:
- Drink water constantly — even if you don’t feel thirsty
- Stay indoors during peak heat (usually 10 AM – 6 PM)
- Use air conditioning or visit cooling centers (libraries, malls, community centers)
- Check on neighbors, especially elderly people and those without AC
- Never leave kids or pets in cars — not even for a minute
- Wear light, loose clothing and a wide-brimmed hat if outside
- Limit outdoor exercise to early morning or evening hours
Summary
Denver is in for a long, hot stretch with temperatures at or above 90°F for the next 10–14 days. The weekend could hit 100°F, prompting weather alerts. Tuesday offers a brief reprieve with highs in the 80s, but then the heat returns. The good news? Fall milestones are just weeks away — the first day of autumn is about 54 days out, and average highs drop below 80°F in about 7 weeks. Until then, stay cool, stay hydrated, and look out for each other.
Frequently Asked Questions
1. What exactly is a "Weather Impact Alert"?
It’s a heads-up from the 9NEWS weather team that weather conditions could significantly affect your daily life or safety. For heat, it means temperatures are high enough to cause health problems, especially for vulnerable people.
2. What’s the difference between a Heat Advisory and a Weather Impact Alert?
A Heat Advisory is an official National Weather Service warning when heat index values are dangerously high. A Weather Impact Alert is 9NEWS’ own system to highlight impactful weather. They often happen together.
3. Why does Denver get so hot in summer?
Denver’s high elevation (5,280 feet) means thinner air that heats up quickly under strong summer sun. Combined with dry air and urban heat from concrete/asphalt, temperatures can soar.
4. Has Denver ever had snow in September?
Yes! The earliest measurable snowfall was September 3, 1961. It also snowed on September 8, 2020. While rare, early snow happens!
5. When will this heat wave definitely end?
Long-range forecasts suggest meaningful cooling begins in September, with average highs dropping below 80°F around September 17. The pattern typically shifts toward fall weather by late September.
