Peak in August
Coolest in December
Heavy in December
Peak in dry season
Portland Monthly Weather Guide
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October
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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
Best Time to Visit Portland
Location, climate overview & historical trends
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📍 45.5152° N, 122.6784° W
Open in Google MapsPortland is a prominent destination in United States.
Located at 45.52°N latitude,Portland experiences a temperate climate with four distinct seasons.
Based on 30 years of data, August is the warmest month (avg. 28°C), while December is the coolest. December sees the most rain (51% chance), making July the driest month.
Historical Climate Trend
30-Year Analysis+0.79°C
Total over 30 years
+0.26°C
Per decade
Linear regression analysis of historical maximum temperatures for Portland, based on 1995-2024 satellite data from NASA POWER.
Best Time to Visit
NASA POWER Data (1991-2021)May, June, July
Best months to visit
17°C
Avg High
Based on 30 years of NASA satellite data,Portland receives approximately 938mm of rainfall annually. These months offer optimal temperatures and minimal rain probability for your visit.
Climate Trends
EXCLUSIVE1995-2040 Temperature Trend
1995 Avg
16.5°
2024 Avg
17.3°
2040 Proj
17.8°
+0.26°C
per decade (observed)
+0.29°C
per decade (CMIP6)
🌡️ Portland has warmed by +0.8°C since 1995. By 2040, an additional +0.5°C is projected (based on CMIP6 rate of 0.288°C/decade), for a total of +1.3°C from 1995 baseline.
NASA POWER (1995-2024) + CMIP6 (CMCC_CM2_VHR4, EC_Earth3P_HR, FGOALS_f3_H, HiRAM_SIT_HR, MRI_AGCM3_2_S, NICAM16_8S)
Travel Intelligence
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Flight Connectivity Analysis
Airport traffic data & seasonal patterns
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Peak
Aug
Low
Jan
Monthly Traffic Distribution
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Health & Safety Advisory
CDC travel health recommendations
No Special Vaccinations Required
Standard travel precautions apply
Source: CDC Travelers' Health
View Complete Health GuidePortland Climate Data by Month
Historical temperature and precipitation averages
| Month | Avg High (°C) | Rain Probability (%) | Status |
|---|---|---|---|
| January | 8°C | 48% | 🌧️ Rainy |
| February | 9°C | 44% | 🌧️ Rainy |
| March | 12°C | 48% | 🌧️ Rainy |
| April | 15°C | 40% | Neutral |
| May | 19°C | 28% | 😊 Pleasant |
| June | 22°C | 18% | ✨ Perfect |
| July | 28°C | 4% | ✨ Perfect |
| August | 28°C | 6% | ✨ Perfect |
| September | 24°C | 15% | ✨ Perfect |
| October | 17°C | 32% | 😊 Pleasant |
| November | 11°C | 49% | 🌧️ Rainy |
| December | 8°C | 51% | 🌧️ Rainy |
Weather in Cities Near Portland
Explore climate data for popular destinations within easy reach
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Compare weather conditions with nearby destinations for your trip planning
Compare Portland Weather vs Popular Destinations
Similar Climate Destinations
Discover destinations with weather similar to Portland
Antwerp
Belgium
Auckland
New Zealand
Ponta Delgada
Portugal
Basel
Switzerland
Batumi
Georgia
Bilbao
Spain
These destinations share similar weather patterns with Portland. Perfect alternatives if you're looking for the same climate in a different location.
Portland Weather FAQ
When is the best time to visit Portland?
Honestly, look for months with mild temperatures (20°C-25°C) and low rain chance. Based on historical data, May, June, July are usually great choices.
When is the hottest month in Portland?
August is historically the hottest month in Portland with average highs of 28°C.
When does it rain the most in Portland?
December typically sees the highest probability of rain (51%).
Is Portland expensive?
Prices vary by season. The "Perfect" weather months usually coincide with peak tourist season and higher prices, while the rainy or cold months offer better deals.