Climate averages 1991–2020
Portland weather
in March.
A cool, wet month: the 8th warmest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
March is a cool month in Portland: daytime highs average 12.4°C and nights cool to about 3.4°C. By daytime temperature it is the 8th warmest of the 12 months.
Expect about 145 mm of rain on roughly 18 days, which makes March a wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 53 min on an average March day.
The nearest other city in this atlas is Beaverton (11 km away). In March its highs average 12.0°C, about as warm as Portland, with 145 mm of rain.
Among the 498 cities listed in the United States, Portland ranks joint 302nd of 498 for the warmest March highs and joint 484th of 498 for the driest March (rainfall, lowest first). The mean March high of those 498 cities is 14.9°C; Portland is 2.5°C cooler than that mean.
From March to April, average highs rise by 2.5°C to 14.9°C, and monthly rainfall falls from 145 mm to 115 mm.
The annual picture
March 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, selected | 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 | 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
March in nearby cities
- Beaverton in MarchUnited States · 11 kmHigh 12.0°C · Low 3.3°C · 145 mm rain
- Vancouver, United States in MarchUnited States · 13 kmHigh 12.0°C · Low 3.2°C · 178 mm rain
- Gresham in MarchUnited States · 19 kmHigh 11.5°C · Low 2.4°C · 178 mm rain
- Hillsboro in MarchUnited States · 24 kmHigh 12.1°C · Low 3.5°C · 151 mm rain
- Salem, United States in MarchUnited States · 70 kmHigh 12.3°C · Low 3.5°C · 128 mm rain
- Eugene in MarchUnited States · 167 kmHigh 12.4°C · Low 2.9°C · 160 mm rain
- Tacoma in MarchUnited States · 193 kmHigh 10.7°C · Low 2.9°C · 132 mm rain
- Bend in MarchUnited States · 195 kmHigh 8.2°C · Low -2.4°C · 56 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.