Month guide · Denver · United States
Denver in September
What September is really like in Denver: weather, crowds, prices, events and what to pack.
Updated By the AMZBooking editorial team
Quick answer
September is one of the best months to visit Denver. Expect average highs of 25°C (77°F), lows of 9°C (48°F), about 6 rainy days and roughly 12.4 hours of daylight. Often the best month: warm, dry and clear, with golden aspens in the mountains from mid-month.
Key facts
- Average high / low
- 25°C (77°F) / 9°C (48°F)
- Rainy days
- About 6
- Daylight
- About 12.4 hours
- Crowds
- Busy
- Hotel prices
- High
Weather in September
September is the 4th-warmest month in Denver: days average 25°C (77°F) against a yearly average high of 18°C (64°F), and nights fall to about 9°C (48°F). Rain falls on roughly 6 of its 30 days. Compared with August (30°C (86°F)), September is cooler; by October highs drop to around 18°C (64°F).
- Sunrise (15 September)
- About 06:41
- Sunset (15 September)
- About 19:09
- Daylight
- About 12.4 hours
Autumn (September–November). Clear, mild September and October with golden aspens, then colder with the first snows in November.
Crowds and prices
On a 1–5 scale, September rates 4 for crowds (the peak is July at 5) and 4 for hotel prices (highest in July). Book accommodation early: September is one of the pricier months.
Events in September
- Golden aspen season in the mountains (usually mid-September to early October)
- Great American Beer Festival (usually September or October)
Dates move from year to year. Check the organiser’s site before booking travel around an event.
What to do in September
Mild, settled days suit walking, viewpoints and time outdoors.
Museum · Golden Triangle
Denver Art Museum
Start with the Western American art and Indigenous arts galleries, which are the museum's specialities.
- Time needed
- 2–3 hours
- Cost
- Mid-priced
- Iconic
- Art
- Rainy day
- Architecture
Architecture · LoDo and Union Station
Denver Union Station
The 1914 Beaux-Arts station was restored in 2014 as a transit hub, hotel and public 'living room', with restaurants, bars and a bookshop in the Great Hall.
- Time needed
- 1 hour
- Cost
- Free
- Free
- Architecture
- Food
- History
Street · Downtown and Larimer Square
Larimer Square
Come in the evening when the lights are on, and look for the lower-level cocktail bars.
- Time needed
- 1 hour
- Cost
- Free
- Free
- After dark
- Food
- History
Gallery · Golden Triangle
Clyfford Still Museum
Dedicated to the Abstract Expressionist painter Clyfford Still, whose estate gave nearly his entire body of work to the city.
- Time needed
- 1 hour
- Cost
- Mid-priced
- Art
- Rainy day
- Architecture
- Off the beaten path
What to pack
For highs near 25°C, lows near 9°C and 6 wet days: light layers for the day and a light jacket for the evening; comfortable walking shoes.
Is September a good time to visit Denver?
One of the best months to visit Denver, with 2 notable events on the calendar. The other best months are June–August. Compare every month.
Denver in other months
Questions travellers ask
+Is September a good time to visit Denver?
It is one of the best months to visit Denver. Often the best month: warm, dry and clear, with golden aspens in the mountains from mid-month.
+How warm is Denver in September?
Average highs are around 25°C (77°F) and lows around 9°C (48°F).
+Does it rain a lot in Denver in September?
Expect rain on about 6 days of the month.