September 1 is statistically one of the best days of the year in Denver. With minimal rain risk (4%) and pleasant highs of 29°C, it's ideal for outdoor adventures. Denver is currently in its most popular travel window, meaning vibrant crowds and premium pricing. Note: September 1 is Labour Day in Denver, so expect special events, closures, and festive atmosphere.
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Essential Travel Info for Denver
Currency
USD
$ United States dollar
Language
English
Driving
Right side
Safety
Moderate Safety
GPI: 2.44
Denver Weather Forecast for September 1
"Warm & Sunny. Expect average highs of 29.3°C. 4% chance of rain."
What to Wear in Denver in September
Based on historical data for September 1, Denver typically experiences temperatures between 13.4°C and 29.3°C. We recommend packing t-shirt, light clothing, layers (onion system) to stay comfortable. Trends suggest it will stay mostly dry (4% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for Denver
Smart Suitcase
- T-Shirt
- Light Clothing
- Layers (Onion System)
Average High
29.3°C
Daytime Peak
Average Low
13.4°C
Nighttime Low
Feels Like
29.4°C
🔥 Feels accurate
Rain Chance
4%
Avg 0.2mm if it rains
Cloud Cover
34%
Overcast
Pressure
1013.7 hPa
Medium volatility
Denver Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 94% of the time. Safe to plan outdoor activities with confidence.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 30 recommended
05:00 - 10:00
16:00 - 18:00
Type I-II
🔴 20 min to burn
Type III-IV
🟡 30 min to burn
Type V-VI
🟢 50 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
16.1°C
Noticeable
Heat Index
29.4°C
Feels hotter
🙂 Best outdoor time:
Any time during daylight hours
Travel & Logistics Insights
Local Calendar
Holiday
Labour Day
Flight Traffic
High
96/100 pressure index
Health Advisory
Healthy
Routine only • View Details →
Landing Slots
~1,109
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Denver
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
05:29
☀️ Noon
12:01
🌇 Sunset
18:33
⏱️ Daylight
13h 4m
Wind Speed
13.4 km/h
Gentle breeze
Sunshine
11.5 hrs
Direct Sun (Cloud-free)
Humidity
45%
Comfortable
Travel Intelligence
Exclusive flight analytics & health data for Denver
Smart Flight Estimator
Airport-to-Airport Logistics
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Travel Health & Safety in Denver
Travel Comfort Index
Real-time tourism conditions
Weather Quality
☀️ Excellent
Tourist Crowds
🟡 Busy
Price Level
💰💰💰 Expensive
Health & Wellbeing
Meteo-Health Forecast
Moderate fluctuations. Some sensitivity possible.
Weather unlikely to affect joint pain.
Moderate fish activity expected.
Air quality is excellent. Perfect for outdoor activities.
Regional Safety Profile
Seismic Activity
Zero seismic activity detected in 30 years.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Denver on September 1 averages 29.3°C with a 4% precipitation probability. Wedding/Outdoor Event Score: 100/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Denver Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Compare Other Cities
Same date (September 1) in other destinations
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🌍 Explore the same date in different destinations around the world
📍 Is Denver Worth Visiting on September 1?
Planning a trip to Denver on September 1? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year typically offers vibrant summer conditions averaging 29.3°C with a 4% historical precipitation risk.
🎉 Local Event: The date coincides with Labour Day, which may influence local business hours and event availability.
✈️ Travel Logistics: Approximately 1,109 landing slots available daily during this period, indicating peak tourist activity.
📊 Historical Extremes: The hottest September 1 recorded in the last 30 years saw temperatures hit 35.7°C in 2023, while the coldest dropped to 10.5°C in 2025.