Portland · AutumnMonth summary
Portland weather in September
✅ Good
🌡️ Temperature min / max
13°C – 24°C
🌧 Rainy days
25% of days
☀️ Sunshine
11.3h per day on average
🌊 🌊 Season
Autumn
⭐ ⭐ Weather score
8.1/10
📅 📅 Best month
July (10.0/10)
Quick decision
Should you visit Portland in September?
✅ Good
✅ Yes if: you want good weather with lower prices than peak season.
❌ No if: you need guaranteed perfect weather — some mixed days are possible.
Our take: Favourable conditions in September (8.1/10). July scores higher but the gap is small.
By trip type
Portland 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
🎯 Peak cultural season — museums and sites accessible in good weather conditions Autumn in Portland is often underrated: 24°C, golden light and declining crowds. An interesting window. Rain risk remains low (25% of days), leaving good room for outdoor activities. A good balance between weather and crowds, even if July (10.0/10) remains theoretically better.
Browse by month
All months for Portland
Annual table
Month-by-month comparison
| Month | Min °C | Max °C | Rain % | Precip mm | Sun h/d | Score |
|---|---|---|---|---|---|---|
| 🌦️ January | 2°C | 8°C | 61% | 6.2 | 3.9h | 1.4/10 |
| 🌦️ February | 2°C | 9°C | 60% | 5.4 | 5.5h | 2.2/10 |
| 🌦️ March | 3°C | 11°C | 60% | 4.7 | 8.2h | 4.0/10 |
| 🌦️ April | 5°C | 15°C | 51% | 3.7 | 10.2h | 5.6/10 |
| 🌤️ May | 9°C | 19°C | 36% | 2.4 | 11.9h | 7.3/10 |
| 🌤️ June | 12°C | 23°C | 26% | 2.0 | 13.5h | 8.3/10 |
| ☀️ July | 14°C | 28°C | 7% | 0.3 | 14.5h | 10.0/10 |
| ☀️ August | 15°C | 29°C | 9% | 0.4 | 13.0h | 9.3/10 |
| 🌤️ September | 13°C | 24°C | 25% | 2.1 | 11.3h | 8.1/10 |
| 🌦️ October | 8°C | 16°C | 42% | 4.7 | 8.2h | 5.9/10 |
| 🌦️ November | 5°C | 11°C | 58% | 6.5 | 5.4h | 3.0/10 |
| 🌦️ December | 2°C | 8°C | 61% | 6.9 | 3.8h | 1.4/10 |
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, Portland averages 24°C, 25% rainy days and 11.3h of sunshine per day. Overall weather score: 8.1/10.
See methodology →
Comparison
September vs July (best month)
The best month is July (score 10.0/10). Difference:
- 🌡️ Max temperature : +4°C
- 🌧 Rainy days : -18%
- ☀️ Sunshine : +3.2h/day
FAQ
FAQ — Portland in September
Is September a good time to visit Portland?
September is an excellent time to visit Portland (score 8.1/10). With 24°C, 11.3h of sunshine and 25% rain, conditions are very favourable.
What to do in Portland in September?
With 24°C and 11.3h of sunshine, all outdoor activities are possible: hiking, sightseeing and terraces.
Accommodation
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Activities & tours
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