Labor Day weekend often marks the unofficial transition from summer to fall in Colorado, and Denver’s weather history shows that the holiday can bring just about anything—from triple-digit heat to jacket-worthy chill.
A Look at Denver’s 2025 Labor Day
On September 1, 2025, Denver recorded a high of 81°F and a low of 54°F, putting the city slightly below the long-term averages of 83° for highs and 54° for lows. The day was dry, with no measurable precipitation, continuing a trend of quiet holiday weather in recent years.
This year’s temperatures landed Denver solidly in the middle of the pack: cooler than the scorching 93°F high of Labor Day 2024, but much warmer than some of the city’s coldest early-September holidays, such as the frigid 52°F high in 1974.
Labor Day Extremes in Denver
Denver’s Labor Day weather history, stretching back to 1894, is full of variety:
- Hottest Labor Day: 100°F on September 2, 2019
- Coldest Morning Low: 40°F (tied in 1973, 1961, and 1934)
- Coolest High: 52°F on September 2, 1974
- Wettest Labor Day: 0.44 inches of rain in 1997
- Snowfall: None recorded on any Labor Day
The data show that heat is more common than cold—five of the past ten Labor Days have reached 90°F or higher. Still, Denver is no stranger to abrupt cooldowns; just five years ago, in 2020, the holiday featured a chilly 43°F morning low and measurable rainfall.
How 2025 Fits the Trend
Compared with recent years, Labor Day 2025 leaned cooler and closer to normal. The high of 81°F was four degrees below the normal of 85°F, and the dry skies kept Denver out of the record books. In contrast, Labor Day 2022 hit 97°F, tying for the second-warmest on record, while 2024 reached 93°F.
For many, this year’s weather was ideal for cookouts, hikes, and end-of-summer getaways—warm enough to enjoy the outdoors without the oppressive heat Denver often sees in early September. With dry skies and low humidity, the 2025 holiday will likely be remembered as one of the more comfortable in recent history.
As always, Colorado’s climate reminds us that Labor Day can be a wildcard. Whether it’s a sweltering 100° afternoon or a jacket-and-rain kind of day, Denver’s September weather keeps us on our toes.