United States
Denver in September
🍂 AutumnWarm and mostly dry.
🎒 Pack: sunglasses & hat
Why September scores 9.4What goes into the score
How it works- Weather comfort9.6
- ✓Warm (28°C highs / 10°C lows)
- ✓Comfortable humidity (dew point 2.8°C)
- ✓Mostly dry (~31 mm rain)
- Air quality9.0
- ✓Good (within WHO guideline) (PM2.5 ~11 µg/m³)
- Seasonal hazards10.0
- ·No notable seasonal hazards
- Safety baseline7.5
- ·Increased caution
| Sep | Jun | |
|---|---|---|
| Score | 9.4 Excellent | 9.3 Excellent |
| Season | 🍂 Autumn | ☀️ Summer |
| High / low | 28° / 10° | 30° / 13° |
| Rain | 31 mm | 44 mm |
| Humidity | dew pt 3° | dew pt 6° |
| PM2.5 | 11 µg/m³ | 10 µg/m³ |
Typical-month data: NASA POWER (MERRA-2 reanalysis) 2015–2024 (modelled, not a forecast). Temperatures: Denver weather-station normals. Rainfall: Denver Water Department weather-station normals (national met service).
Holidays & crowdsSeptember 2027
Long weekendThere's at least one long weekend. Domestic travel picks up and popular spots get busier over those days.
- Labor Day 4–6 Sep · 3 days off in a row
National holidays only; regional holidays and school breaks aren't included. Source: holidays (open-source public-holiday calendar).
Explore DenverEvents, sights, food & souvenirs
Check event dates locallyColorado's capital, the 'Mile High City', known for its craft beer, sports, Red Rocks and easy access to the Rocky Mountains.
Great American Beer FestivalDate variesUsually September or October
A huge beer festival with breweries from across the US.
Why go: Tickets sell out.
Where: Colorado Convention Center
Coming up later
National Western Stock ShowDate variesUsually January
A large livestock show and rodeo.
Why go: A long-running Western tradition.
Where: National Western Complex
Cherry Creek Arts FestivalDate variesUsually early July
A large outdoor arts festival.
Why go: Free to attend.
Where: Cherry Creek North
Red Rocks Park and Amphitheatre
An outdoor concert venue set between giant red sandstone rocks.
💡 Open for walks during the day when no shows are on.
Rocky Mountain National Parkgreat in Sep
High mountain scenery and wildlife about two hours away.
💡 Trail Ridge Road is usually open only in the warmer months.
Denver Art Museum
A large museum known for its collection of Indigenous arts.
Union Station and LoDo
A restored railway station and the historic lower downtown district.
Denver Botanic Gardens
Gardens with plants from around the world and the high plains.
Coors Field
Home of the Colorado Rockies baseball team.
Green chile
Pork green chile stew, often smothering burritos.
Denver omelette
An omelette with ham, onions and green peppers.
Craft beer
Denver has many breweries and taprooms.
💡 Breweries in RiNo and around the city
Rocky Mountain oysters
Fried bull testicles, a Western novelty dish.
Bison
Bison burgers and steaks.
Craft beer
Bottles and cans from local breweries.
💡 Liquor stores and taprooms
Western wear
Hats, boots and belts.
💡 Western outfitters
Airport transfer Kiwitaxi
Partner links: we may earn a small commission at no extra cost to you. It never affects scores.