Best Time to Visit Portland
United States · Oceanic climate · Data averaged from 2020-01-01 to 2024-12-31 (5 years)
Recommended Months
Based on temperature comfort, low precipitation, and sunshine hours, the best time to visit Portland is:
July → August → June
July scores 90/100 — the highest-rated month for travel.
Monthly Ratings (0-100)
Scores are weighted: temperature comfort (50%), low precipitation (30%), sunshine (20%). Higher is better.
| Month | Overall Score | Temp Comfort | Precipitation | Sunshine | Bar |
|---|---|---|---|---|---|
| January | 5 | 10 | 0 | 0 | |
| February | 4 | 9 | 0 | 0 | |
| March | 9 | 18 | 0 | 0 | |
| April | 16 | 32 | 0 | 0 | |
| May | 26 | 52 | 0 | 0 | |
| June | 35 | 70 | 0 | 0 | |
| July | 71 | 92 | 85 | 0 | |
| August | 64 | 92 | 60 | 0 | |
| September | 38 | 76 | 0 | 0 | |
| October | 24 | 48 | 0 | 0 | |
| November | 10 | 20 | 0 | 0 | |
| December | 5 | 10 | 0 | 0 |
Monthly Temperature Comfort
| Month | Mean Temp | Comfort Level |
|---|---|---|
| January | 5.1°C (41.2°F) | Cool (0-9°C) |
| February | 4.8°C (40.6°F) | Cool (0-9°C) |
| March | 6.6°C (43.9°F) | Cool (0-9°C) |
| April | 9.4°C (48.9°F) | Cool (0-9°C) |
| May | 13.3°C (55.9°F) | Mild (10-17°C) |
| June | 17.1°C (62.8°F) | Mild (10-17°C) |
| July | 21.3°C (70.3°F) | Warm (18-24°C) |
| August | 21.5°C (70.7°F) | Warm (18-24°C) |
| September | 18.3°C (64.9°F) | Warm (18-24°C) |
| October | 12.7°C (54.9°F) | Mild (10-17°C) |
| November | 7.1°C (44.8°F) | Cool (0-9°C) |
| December | 5.1°C (41.2°F) | Cool (0-9°C) |
Monthly Precipitation Rating
| Month | Rainfall (mm) | Rainy Days | Rating |
|---|---|---|---|
| January | 238.0 mm | 23.0 | Very Wet |
| February | 127.7 mm | 19.2 | Very Wet |
| March | 121.4 mm | 18.8 | Very Wet |
| April | 109.2 mm | 18.2 | Very Wet |
| May | 97.6 mm | 17.0 | Wet |
| June | 77.6 mm | 12.2 | Wet |
| July | 5.1 mm | 4.0 | Dry |
| August | 13.2 mm | 4.8 | Dry |
| September | 65.2 mm | 9.4 | Wet |
| October | 111.8 mm | 14.4 | Very Wet |
| November | 220.8 mm | 20.0 | Very Wet |
| December | 247.2 mm | 22.2 | Very Wet |
Monthly Sunshine Rating
| Month | Sunshine (hrs/day) | Rating |
|---|---|---|
| January | 3.6 hrs | Low |
| February | 5.4 hrs | Moderate |
| March | 7.1 hrs | Good |
| April | 8.9 hrs | Excellent |
| May | 10.1 hrs | Excellent |
| June | 11.7 hrs | Excellent |
| July | 13.5 hrs | Excellent |
| August | 11.9 hrs | Excellent |
| September | 10.0 hrs | Excellent |
| October | 7.0 hrs | Good |
| November | 4.8 hrs | Moderate |
| December | 3.5 hrs | Low |
Season-by-Season Breakdown
Spring (Mar-May)
Temperature: 9.8°C (49.6°F)
Rainfall: 109.4mm avg
Sunshine: 8.7 hrs/day
Humidity: 76.8%
Rainy Days: 18.0/mo
Mild transitional weather — comfortable for most activities.
Summer (Jun-Aug)
Temperature: 20.0°C (68.0°F)
Rainfall: 32.0mm avg
Sunshine: 12.4 hrs/day
Humidity: 61.9%
Rainy Days: 7.0/mo
Mild transitional weather — comfortable for most activities.
Autumn (Sep-Nov)
Temperature: 12.7°C (54.9°F)
Rainfall: 132.6mm avg
Sunshine: 7.3 hrs/day
Humidity: 76.5%
Rainy Days: 14.6/mo
Mild transitional weather — comfortable for most activities.
Winter (Dec-Feb)
Temperature: 5.0°C (41.0°F)
Rainfall: 204.3mm avg
Sunshine: 4.2 hrs/day
Humidity: 84.8%
Rainy Days: 21.5/mo
This is the cool season. Pack warm layers and plan indoor activities.
Frequently Asked Questions
What is the best time to visit Portland?
Based on our data-driven analysis, the best months to visit Portland are July, August, June, when temperatures are comfortable, rainfall is lower, and sunshine is plentiful. July scores 90/100, the highest-rated month.
What is the hottest month in Portland?
August is the hottest month with an average temperature of 21.5°C (70.7°F).
What is the coldest month in Portland?
February is the coldest month with an average temperature of 4.8°C (40.6°F).
When is the rainy season in Portland?
December is the wettest month with an average of 247.2mm of precipitation. Portland experiences about 183.0 rainy days per year. The driest month is July with 5.1mm.
What should I pack for a trip to Portland?
Packing recommendations depend on the season of your visit. Based on the climate data, pack lightweight, breathable clothing if visiting during the warm months (August is hottest at 21.5°C). For cooler months, bring layers and a warm jacket (February averages 4.8°C). A waterproof jacket or umbrella is recommended year-round as Portland receives 1435.0mm of annual precipitation. Sun protection is important, especially during months with high UV index.
Portland's climate is similar to Seattle but with slightly warmer summers and cooler winters. I visited during the famous rose festival in June and found the weather ideal. The data shows that the best time to visit is June to September, when the rainfall is minimal and the city's famous outdoor culture thrives. The winter months are grey and wet but the city's coffee shop culture makes it cozy.
Data Source: Open-Meteo historical archive (2020-01-01 to 2024-12-31). Daily measurements aggregated into monthly climate normals. Coordinates: 45.52°, -122.68°. Timezone: America/Los_Angeles. Last updated: 2026-07-30.