Portland, OR weather by month
West · Station: Portland International Airport (PDX), OR · NOAA 1991–2020 Climate Normals
The best time to visit Portland, OR is April–September, when average daytime highs are comfortable and rainfall sits at or below the city's monthly average. Portland is hottest in July (avg high 82°F) and coolest in December (avg high 47°F). The wettest month is December (5.8 in) and the driest is July (0.5 in). Overall the annual mean temperature is about 55.2°F with 36.9 in of precipitation a year and 4.2 in of snow.
Source: NOAA NCEI U.S. Climate Normals 1991–2020. Data as of June 2026.
Monthly weather averages for Portland
| Month | Avg high (°F) | Avg low (°F) | Avg precip (in) | Avg snow (in) |
|---|---|---|---|---|
| January | 48 | 36 | 5 | 1.7 |
| February | 52 | 37 | 3.7 | 1.2 |
| March | 57 | 40 | 4 | 0.1 |
| April | 62 | 44 | 2.9 | 0 |
| May | 69 | 49 | 2.5 | 0 |
| June | 74 | 54 | 1.6 | 0 |
| July | 82 | 59 | 0.5 | 0 |
| August | 82 | 59 | 0.5 | 0 |
| September | 77 | 54 | 1.5 | 0 |
| October | 64 | 47 | 3.4 | 0 |
| November | 54 | 41 | 5.5 | 0 |
| December | 47 | 36 | 5.8 | 1.2 |
Source: NOAA NCEI U.S. Climate Normals 1991–2020. Data as of June 2026.
Best time to visit Portland
Based on the normals above, the most pleasant window is April–September. In those months daytime highs are in the mild-to-warm range and precipitation is no higher than the city's typical month, so you avoid both the peak warm of July (when highs reach about 82°F — t-shirt weather; sunscreen advised) and the cool, darker conditions around December (highs near 47°F). Try to avoid December if rain would spoil your plans — it is the wettest month at 5.8 in. Use the packing & comfort tool to check any specific month.
How Portland compares
Portland's 36.9 in of annual precipitation and 55.2°F mean temperature put it in context with other US cities. See where it ranks for warmest in January, rainiest overall and driest overall, or browse the full list of cities.
Frequently asked questions
What is the best time to visit Portland?
The most comfortable time to visit Portland, OR is April–September, when average daytime highs are mild and rainfall is at or below the city's average. Portland is hottest in July (avg high 82°F) and coolest in December (avg high 47°F), per NOAA 1991–2020 Climate Normals.
What is the average temperature in Portland?
Portland's annual mean temperature is about 55.2°F. The warmest month is July (average high 82°F, low 59°F) and the coolest is December (average high 47°F, low 36°F).
How much rain does Portland get?
Portland receives about 36.9 inches of precipitation a year. The wettest month is December (5.8 in) and the driest is July (0.5 in).
Does it snow in Portland?
Yes. Portland averages about 4.2 inches of snow a year. Snow normally falls between late autumn and early spring; summer months see none.
Source
Monthly averages from the NOAA NCEI U.S. Climate Normals 1991–2020, station Portland International Airport (PDX), OR (reference values verified against the published normals). Climate normals describe a 30-year average, not a forecast; any individual year can differ. See our methodology for how "best time to visit" is derived.
Last updated: 2026-06-18