August 4 is statistically one of the best days of the year in Portland. With minimal rain risk (5%) and pleasant highs of 29°C, it's ideal for outdoor adventures. As it's peak season for Portland, we recommend booking your stay well in advance to secure the best rates.
View the full calendar
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 August 4
"Warm & Sunny. Expect average highs of 28.8°C. 5% chance of rain."
What to Wear in Portland in August
Based on historical data for August 4, Portland typically experiences temperatures between 15.2°C and 28.8°C. We recommend packing t-shirt, light clothing, layers (onion system) to stay comfortable. Trends suggest it will stay mostly dry (5% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for Portland
Smart Suitcase
- T-Shirt
- Light Clothing
- Layers (Onion System)
Average High
28.8°C
Daytime Peak
Average Low
15.2°C
Nighttime Low
Feels Like
30.6°C
🔥 Minor difference
Rain Chance
5%
Avg 0.1mm if it rains
Cloud Cover
33%
Overcast
Pressure
1016.4 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 86% of the time. Safe to plan outdoor activities with confidence.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 30 recommended
04:00 - 10:00
16:00 - 19:00
Type I-II
🔴 16 min to burn
Type III-IV
🟡 24 min to burn
Type V-VI
🟢 40 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
20°C
Humid/Sticky
Heat Index
30.6°C
Feels hotter
🙂 Best outdoor time:
Any time during daylight hours
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in United States
Flight Traffic
High
100/100 pressure index
Health Advisory
Healthy
Routine only • View Details →
Landing Slots
~326
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Portland
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
04:59
☀️ Noon
12:18
🌇 Sunset
19:36
⏱️ Daylight
14h 37m
Wind Speed
12.7 km/h
Gentle breeze
Sunshine
12.2 hrs
Direct Sun (Cloud-free)
Humidity
59%
Comfortable
Travel Intelligence
Exclusive flight analytics & health data for Portland
Smart Flight Estimator
Airport-to-Airport Logistics
unlock smart flight estimates
Add your home location in settings to see airport details.
Travel Health & Safety in Portland
Travel Comfort Index
Real-time tourism conditions
Weather Quality
☀️ Excellent
Tourist Crowds
🔴 Very 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 August 4 averages 28.8°C with a 5% precipitation probability. Wedding/Outdoor Event Score: 100/100."
— 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
Compare Other Cities
Same date (August 4) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Portland Worth Visiting on August 4?
Planning a trip to Portland on August 4? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year typically offers vibrant summer conditions averaging 28.8°C with a 5% historical precipitation risk.
✈️ Travel Logistics: Approximately 326 landing slots available daily during this period, indicating manageable crowd levels.
📊 Historical Extremes: The hottest August 4 recorded in the last 30 years saw temperatures hit 35.7°C in 2021, while the coldest dropped to 14.2°C in 2016.