Portland, Oregon Weather
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Climate of Portland: monthly averages
Based on 25 years of satellite and reanalysis data (2001-2025), August is usually the hottest month in Portland, with average daytime highs around 28°C. December is the coolest, when nights typically fall to about 0°C and frost is possible on the coldest nights.
The area receives about 1480 mm of rain in a typical year. Most of it falls from October to April (around 85% of the yearly total), and December is the wettest month at roughly 251 mm.
For outdoor plans and travel, June to September usually offer the most comfortable weather in Portland, with mild days and relatively little rain.
| Month | Avg high | Avg low | Rainfall | Humidity |
|---|---|---|---|---|
| Jan | 7° | 1° | 216 mm | 92% |
| Feb | 8° | 1° | 144 mm | 89% |
| Mar | 10° | 2° | 178 mm | 87% |
| Apr | 13° | 4° | 119 mm | 84% |
| May | 17° | 7° | 79 mm | 82% |
| Jun | 21° | 9° | 55 mm | 80% |
| Jul | 26° | 12° | 11 mm | 70% |
| Aug | 28° | 12° | 20 mm | 65% |
| Sep | 23° | 10° | 57 mm | 68% |
| Oct | 16° | 6° | 137 mm | 80% |
| Nov | 10° | 3° | 217 mm | 89% |
| Dec | 6° | 0° | 251 mm | 92% |
Source: NASA POWER (MERRA-2 reanalysis), averaged over the roughly 50 km grid area around Portland. Values describe typical conditions, not a forecast.
About Portland weather
Portland sits within Oregon's climate divide — mild, wet Pacific coast and Willamette Valley to the west, drier high desert east of the Cascades, about 166 km north of Eugene. Conditions turn hot with warm, dry summers (June–September) west of the Cascades. By December, expect mild, wet winters (November–March) in the west, colder and snowier in the east. This page shows live, auto-refreshing weather for Portland: current conditions, an hourly breakdown, a 16-day outlook, a date-lookup tool for any past or future date, and real-time air quality, sourced from Open-Meteo. Local timezone: America/Los_Angeles.
Frequently asked questions
Portland is about 166 km north of Eugene, in Oregon.
Portland sees mild, wet winters (November–March) in the west, colder and snowier in the east.
The live current conditions, hourly forecast and 16-day outlook above are pulled in real time for Portland's exact coordinates. No fixed schedule, the page updates whenever you load it.
August is usually the hottest month in Portland, with average daytime highs of about 28°C and nights around 12°C.
The coldest nights come in December, when the average low is about 0°C and daytime highs reach around 6°C. Frost is possible on clear, calm nights.
Portland receives about 1480 mm of rain in a typical year. December is the wettest month at roughly 251 mm, and the main rainy period is October to April.
June to September usually offer the most comfortable weather in Portland, with mild daytime temperatures and little rain.
In November Portland typically sees daytime highs near 10°C and lows near 3°C, with about 217 mm of rain over the month and average humidity around 89%. Check the live forecast above for this week's actual conditions.
Up to 16 days ahead using the extended forecast and date picker above; further-out or historical dates use the same date lookup tool.
Live temperature for Portland is shown at the top of this page and refreshes automatically — see the hourly breakdown below for how it changes through the day.
Portland's day-to-day weather follows the broader pattern of Oregon described above. See the hourly weather forecast or the air quality index for more detail.