Climate averages 1991–2020
Portland weather
in October.
A mild, wet month: the 6th warmest and the 6th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
October is a mild month in Portland: daytime highs average 17.0°C and nights cool to about 8.1°C. By daytime temperature it is the 6th warmest of the 12 months.
Expect about 106 mm of rain on roughly 12 days, which makes October a wet month (the 6th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 10 h 59 min on an average October day.
The nearest other city in this atlas is Beaverton (11 km away). In October its highs average 16.6°C, about as warm as Portland, with 106 mm of rain.
Among the 498 cities listed in the United States, Portland ranks joint 362nd of 498 for the warmest October highs and joint 450th of 498 for the driest October (rainfall, lowest first). The mean October high of those 498 cities is 21.4°C; Portland is 4.3°C cooler than that mean.
From October to November, average highs fall by 5.9°C to 11.1°C, and monthly rainfall rises from 106 mm to 174 mm.
The annual picture
October in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Portland climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 8.4°C1.7°C | 1.7°C | 167 | 17.3 | 9.19 h |
| February | 10.1°C2.0°C | 2.0°C | 130 | 15.0 | 10.310 h |
| March | 12.4°C3.4°C | 3.4°C | 145 | 17.5 | 11.912 h |
| April | 14.9°C5.4°C | 5.4°C | 115 | 16.1 | 13.513 h |
| May | 18.8°C8.8°C | 8.8°C | 70 | 11.1 | 14.915 h |
| June | 21.8°C11.3°C | 11.3°C | 43 | 7.6 | 15.616 h |
| July | 27.1°C14.1°C | 14.1°C | 12 | 2.3 | 15.315 h |
| August | 27.6°C14.6°C | 14.6°C | 14 | 2.6 | 14.114 h |
| September | 24.1°C12.3°C | 12.3°C | 42 | 6.2 | 12.613 h |
| October, selected | 17.0°C8.1°C | 8.1°C | 106 | 11.8 | 11.011 h |
| November | 11.1°C4.2°C | 4.2°C | 174 | 17.3 | 9.610 h |
| December | 7.7°C1.7°C | 1.7°C | 193 | 18.0 | 8.89 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
October in nearby cities
- Beaverton in OctoberUnited States · 11 kmHigh 16.6°C · Low 7.9°C · 106 mm rain
- Vancouver, United States in OctoberUnited States · 13 kmHigh 16.5°C · Low 7.9°C · 143 mm rain
- Gresham in OctoberUnited States · 19 kmHigh 16.0°C · Low 7.1°C · 147 mm rain
- Hillsboro in OctoberUnited States · 24 kmHigh 16.7°C · Low 8.0°C · 107 mm rain
- Salem, United States in OctoberUnited States · 70 kmHigh 17.4°C · Low 7.9°C · 87 mm rain
- Eugene in OctoberUnited States · 167 kmHigh 17.4°C · Low 7.3°C · 107 mm rain
- Tacoma in OctoberUnited States · 193 kmHigh 14.7°C · Low 7.9°C · 112 mm rain
- Bend in OctoberUnited States · 195 kmHigh 15.0°C · Low 2.9°C · 37 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Portland) is explained once on the Portland year overview and on the Sources, method and limits page.
Beaverton lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.