September 28 is generally a great time to visit Portland. While there is a slight chance of rain (28%), showers are usually brief. Expect comfortable 21°C weather. As it's peak season for Portland, we recommend booking your stay well in advance to secure the best rates.
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Essential Travel Info for Portland
Currency
USD
$ United States dollar
Language
English
Driving
Right side
Safety
Moderate Safety
GPI: 2.44
Portland Weather Forecast for September 28
"Mild & Comfortable. Expect average highs of 21.4°C. 28% chance of rain."
What to Wear in Portland in September
Based on historical data for September 28, Portland typically experiences temperatures between 10.9°C and 21.4°C. We recommend packing light jacket, long pants to stay comfortable. With a 28% chance of rain, keeping a raincoat or umbrella handy is a smart move.
Complete Packing Guide
Weekly breakdown & essential items for Portland
Smart Suitcase
- Light Jacket
- Long Pants
Average High
21.4°C
Daytime Peak
Average Low
10.9°C
Nighttime Low
Feels Like
21.6°C
☀️ Feels accurate
Rain Chance
28%
Avg 1.6mm if it rains
Cloud Cover
44%
Overcast
Pressure
1015.8 hPa
Medium volatility
Portland Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
✓ This date historically delivers consistent weather 75% of the time. Safe to plan outdoor activities with confidence.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 15 for extended outdoor time
Type I-II
🔴 28 min to burn
Type III-IV
🟡 42 min to burn
Type V-VI
🟢 70 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
16.4°C
Noticeable
Heat Stress
Low
No heat warning
😊 Best outdoor time:
Any time during daylight hours
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in United States
Flight Traffic
High
94/100 pressure index
Health Advisory
Healthy
Routine only • View Details →
Landing Slots
~305
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Portland
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
06:06
☀️ Noon
12:02
🌇 Sunset
17:58
⏱️ Daylight
11h 52m
Wind Speed
12.1 km/h
Gentle breeze
Sunshine
8.6 hrs
Direct Sun (Cloud-free)
Humidity
73%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Portland
Smart Flight Estimator
Airport-to-Airport Logistics
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Add your home location in settings to see airport details.
Travel Health & Safety in Portland
Travel Comfort Index
Real-time tourism conditions
Weather Quality
⛅ Good
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 acceptable. Sensitive individuals should limit prolonged outdoor exertion.
Regional Safety Profile
Seismic Activity
Rare minor tremors. Buildings are earthquake-resistant.
Volcanic Activity
Nearest: Mount St. Helens
84km away
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Portland on September 28 averages 21.4°C with a 28% precipitation probability. Wedding/Outdoor Event Score: 96/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Portland Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Better Alternatives Nearby
Consider these dates within ±7 days
September 21
22.5°C • 13% rain
Score
100
September 22
22.6°C • 13% rain
Score
100
September 23
22.7°C • 16% rain
Score
100
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (September 28) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Portland Worth Visiting on September 28?
Planning a trip to Portland on September 28? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year is characterized by pleasant mild weather averaging 21.4°C with a 28% historical precipitation risk.
✈️ Travel Logistics: Approximately 305 landing slots available daily during this period, indicating manageable crowd levels.
📊 Historical Extremes: The hottest September 28 recorded in the last 30 years saw temperatures hit 28.8°C in 2018, while the coldest dropped to 6.5°C in 2019.