Portland · AutumnMonth summary
Portland weather in September
✅ Good
🌡️ Temperature min / max
55°F – 75°F
🌧 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: September is a good time to visit Portland. July remains slightly better (+1.9 pts).
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
Autumn in Portland is often underrated: 24°F, 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 °F | Max °F | Rain % | Precip in | Sun h/d | Score |
|---|---|---|---|---|---|---|
| 🌦️ January | 36°F | 46°F | 61% | 0.2in | 3.9h | 1.4/10 |
| 🌦️ February | 36°F | 48°F | 60% | 0.2in | 5.5h | 2.2/10 |
| 🌦️ March | 37°F | 52°F | 60% | 0.2in | 8.2h | 4.0/10 |
| 🌦️ April | 41°F | 59°F | 51% | 0.1in | 10.2h | 5.6/10 |
| 🌤️ May | 48°F | 66°F | 36% | 0.1in | 11.9h | 7.3/10 |
| 🌤️ June | 54°F | 73°F | 26% | 0.1in | 13.5h | 8.3/10 |
| ☀️ July | 57°F | 82°F | 7% | 0.0in | 14.5h | 10.0/10 |
| ☀️ August | 59°F | 84°F | 9% | 0.0in | 13.0h | 9.3/10 |
| 🌤️ September | 55°F | 75°F | 25% | 0.1in | 11.3h | 8.1/10 |
| 🌦️ October | 46°F | 61°F | 42% | 0.2in | 8.2h | 5.9/10 |
| 🌦️ November | 41°F | 52°F | 58% | 0.3in | 5.4h | 3.0/10 |
| 🌦️ December | 36°F | 46°F | 61% | 0.3in | 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 75°F, 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°F
- 🌧 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 75°F, 11.3h of sunshine and 25% rain, conditions are very favourable.
What to do in Portland in September?
With 75°F and 11.3h of sunshine, all outdoor activities are possible: hiking, sightseeing and terraces.
Accommodation
Find a place to stay in Portland
Find places to stay in Portland in September
Search on Hotels.com
Activities & tours
Activities and tours in Portland
Guided tours, skip-the-line tickets and local experiences.
Browse activities on GetYourGuide
Flights
Find a flight to Portland
Compare flights from all airlines.
Search flights
←
Explore also
Similar destinations in September
Vancouver
Porto🌍 Top destinations
Other top destinations in September
San Miguel de Allende
Socotra
Cape Verde
HurghadaWeather rankings
Compare destinations by weather
Best in EuropeGuides & comparisons