September 16 is generally a great time to visit Portland. While there is a slight chance of rain (22%), showers are usually brief. Expect comfortable 23°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 16
"Mild & Comfortable. Expect average highs of 23.2°C. 22% chance of rain."
What to Wear in Portland in September
Based on historical data for September 16, Portland typically experiences temperatures between 12.4°C and 23.2°C. We recommend packing light jacket, long pants to stay comfortable. Trends suggest it will stay mostly dry (22% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for Portland
Smart Suitcase
- Light Jacket
- Long Pants
Average High
23.2°C
Daytime Peak
Average Low
12.4°C
Nighttime Low
Feels Like
23.6°C
☀️ Feels accurate
Rain Chance
22%
Avg 1.8mm if it rains
Cloud Cover
55%
Overcast
Pressure
1014.5 hPa
Low volatility
Portland Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 87% 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
🔴 31 min to burn
Type III-IV
🟡 47 min to burn
Type V-VI
🟢 78 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
17.2°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
05:51
☀️ Noon
12:06
🌇 Sunset
18:22
⏱️ Daylight
12h 30m
Wind Speed
11.3 km/h
Light breeze
Sunshine
9.2 hrs
Direct Sun (Cloud-free)
Humidity
69%
Slightly humid
Travel Intelligence
Exclusive flight analytics & health data for Portland
Smart Flight Estimator
Airport-to-Airport Logistics
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Travel Health & Safety in Portland
Travel Comfort Index
Real-time tourism conditions
Weather Quality
☀️ Excellent
Tourist Crowds
🟡 Busy
Price Level
💰💰💰 Expensive
Health & Wellbeing
Meteo-Health Forecast
Stable conditions. Low risk of headaches.
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 16 averages 23.2°C with a 22% precipitation probability. Wedding/Outdoor Event Score: 98/100."
— 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 9
26.2°C • 9% rain
Score
100
September 10
26°C • 10% rain
Score
100
September 11
25.8°C • 10% rain
Score
100
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (September 16) in other destinations
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📍 Is Portland Worth Visiting on September 16?
Planning a trip to Portland on September 16? 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 23.2°C with a 22% historical precipitation risk.
✈️ Travel Logistics: Approximately 305 landing slots available daily during this period, indicating manageable crowd levels.
📊 Historical Extremes: The hottest September 16 recorded in the last 30 years saw temperatures hit 29.3°C in 2020, while the coldest dropped to 7.2°C in 2021.