Denver · AutumnMonth summary
Denver weather in September
✅ Excellent
🌡️ Temperature min / max
11°C – 28°C
🌧 Rainy days
14% of days
☀️ Sunshine
11.8h per day on average
🌊 🌊 Season
Autumn
⭐ ⭐ Weather score
9.2/10
📅 📅 Best month
September (9.2/10)
Quick decision
Should you visit Denver in September?
✅ Excellent
✅ Yes if: you want to combine beach, sightseeing and hiking — versatile weather (28°C, little rain).
❌ No if: you want to avoid tourist crowds — this is the busiest period.
Our take: Denver in September ticks all the boxes: warmth, sunshine, minimal rain.
By trip type
Denver in September by trip type
- 🏙️ 🏙️ City break / culture : ✅ Good
- 🚶 🚶 Outdoor activities : ✅ Good
- 🏖️ Beach / swimming : — No sea access
- 💰 💰 Budget : 💸 Peak season
Local context
What to expect in September
🎯 One of the best months — 28°C, maximum sunshine and ideal conditions Autumn in Denver is often underrated: 28°C, golden light and declining crowds. An interesting window. Rain risk remains low (14% of days), leaving good room for outdoor activities. This is one of the best times of year to visit Denver.
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All months for Denver
Annual table
Month-by-month comparison
| Month | Min °C | Max °C | Rain % | Precip mm | Sun h/d | Score |
|---|---|---|---|---|---|---|
| 🌫️ January | -8°C | 5°C | 16% | 0.7 | 9.0h | 4.9/10 |
| 🌫️ February | -9°C | 6°C | 19% | 0.9 | 9.9h | 5.2/10 |
| ⛅ March | -4°C | 12°C | 27% | 1.7 | 11.0h | 6.9/10 |
| ⛅ April | 1°C | 17°C | 27% | 1.5 | 12.0h | 7.2/10 |
| 🌤️ May | 6°C | 21°C | 40% | 2.8 | 13.1h | 7.6/10 |
| ☀️ June | 13°C | 29°C | 22% | 1.4 | 13.8h | 9.0/10 |
| ☀️ July | 16°C | 32°C | 23% | 1.0 | 13.5h | 8.2/10 |
| 🌤️ August | 15°C | 31°C | 25% | 1.2 | 12.6h | 8.2/10 |
| ☀️ September | 11°C | 28°C | 14% | 0.8 | 11.8h | 9.2/10 |
| 🌤️ October | 4°C | 21°C | 15% | 0.8 | 10.5h | 7.9/10 |
| ⛅ November | -2°C | 12°C | 14% | 0.6 | 9.4h | 7.0/10 |
| 🌫️ December | -5°C | 8°C | 12% | 0.5 | 8.8h | 5.8/10 |
Ideal
Fair
Challenging climate
◀ Current month · Source Open-Meteo · 10 years
📊 Data source
Data based on 10 years of ERA5 records via Open-Meteo, with ECMWF seasonal adjustment. In September, Denver averages 28°C, 14% rainy days and 11.8h of sunshine per day. Overall weather score: 9.2/10.
See methodology →
Comparison
September vs September (best month)
The best month is September (score 9.2/10). Difference:
- 🌡️ Max temperature : +0°C
- 🌧 Rainy days : +0%
- ☀️ Sunshine : +0.0h/day
FAQ
FAQ — Denver in September
Is September a good time to visit Denver?
September is an excellent time to visit Denver (score 9.2/10). With 28°C, 11.8h of sunshine and 14% rain, conditions are very favourable.
What to do in Denver in September?
With 28°C and 11.8h of sunshine, all outdoor activities are possible: hiking, sightseeing and terraces.
Accommodation
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