Montreal · AutumnMonth summary
Montreal weather in September
✅ Good
🌡️ Temperature min / max
13°C – 22°C
🌧 Rainy days
27% of days
☀️ Sunshine
11.0h per day on average
🌊 🌊 Season
Autumn
⭐ ⭐ Weather score
7.8/10
📅 📅 Best month
July (8.3/10)
Quick decision
Should you visit Montreal in September?
✅ Good
✅ Yes if: you want shoulder-season value — fewer crowds, 22°C.
❌ No if: you need maximum sunshine — some overcast days are possible.
Our take: Montreal in September: 22°C and 11.0h of sunshine. Decent, but not the peak.
By trip type
Montreal in September by trip type
- 🏙️ 🏙️ City break / culture : ✅ Good
- 🚶 🚶 Outdoor activities : ✅ Good
- 🏖️ Beach / swimming : ⚠️ Possible
- 💰 💰 Budget : 💸 Peak season
Local context
What to expect in September
🎯 Harvest season — fresh local produce at markets and restaurants Autumn in Montreal is often underrated: 22°C, golden light and declining crowds. An interesting window. Expect rain on 27% of days — a light raincoat in the bag is recommended. A good balance between weather and crowds, even if July (8.3/10) remains theoretically better.
Browse by month
All months for Montreal
Annual table
Month-by-month comparison
| Month | Min °C | Max °C | Rain % | Precip mm | Sun h/d | Score |
|---|---|---|---|---|---|---|
| ❄️ January | -12°C | -3°C | 39% | 2.5 | 5.7h | 3.2/10 |
| ❄️ February | -12°C | -2°C | 41% | 2.9 | 7.0h | 3.6/10 |
| 🌨️ March | -5°C | 4°C | 40% | 2.7 | 8.9h | 4.0/10 |
| 🌦️ April | 1°C | 10°C | 42% | 3.9 | 9.8h | 4.6/10 |
| 🌤️ May | 8°C | 19°C | 35% | 2.6 | 11.9h | 7.3/10 |
| 🌤️ June | 14°C | 24°C | 43% | 3.7 | 12.6h | 7.8/10 |
| 🌤️ July | 18°C | 27°C | 39% | 3.4 | 13.3h | 8.3/10 |
| 🌤️ August | 17°C | 25°C | 41% | 3.8 | 12.5h | 7.9/10 |
| 🌤️ September | 13°C | 22°C | 27% | 2.3 | 11.0h | 7.8/10 |
| ⛅ October | 7°C | 14°C | 38% | 4.1 | 8.2h | 5.2/10 |
| 🌦️ November | -1°C | 5°C | 44% | 2.8 | 5.8h | 2.8/10 |
| 🌨️ December | -8°C | 0°C | 42% | 2.8 | 4.9h | 2.6/10 |
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, Montreal averages 22°C, 27% rainy days and 11.0h of sunshine per day. Overall weather score: 7.8/10.
See methodology →
Comparison
September vs July (best month)
The best month is July (score 8.3/10). Difference:
- 🌡️ Max temperature : +5°C
- 🌧 Rainy days : +12%
- ☀️ Sunshine : +2.3h/day
FAQ
FAQ — Montreal in September
Is September a good time to visit Montreal?
September is an excellent time to visit Montreal (score 7.8/10). With 22°C, 11.0h of sunshine and 27% rain, conditions are very favourable.
What to do in Montreal in September?
With 22°C max and 11.0h of sunshine, focus on cultural sites, museums and local gastronomy.
Accommodation
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Activities & tours
Activities and tours in Montreal
Guided tours, skip-the-line tickets and local experiences.
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