Portland Weather in March

The weather gets a little warmer and sunnier in Portland, Oregon during March.

This page gives detailed information on the typical March temperature, precipitation, sun, humidity, wind and storms for Portland. The numbers here are historical averages based on climate data gathered near the Portland International Airport, located a few miles from downtown Portland.

Temperature Weather iconTemperature

56 °F March average high 14 °C
40 °F March average low 4 °C
8 days 60 °F max. or more (16 °C)
18 days 40 °F min. or less (4 °C)

Most days in March heat up to over 50 degrees Fahrenheit (10 degrees Celsius) in Portland. The city averages one or two days this month when the thermometer reaches into the 70s °F (over 21 °C). Temperatures above 80 °F (27 °C) are not expected here this time of year.

March has frost for an average of 3 nights. But the temperature does not normally get as cold as 20 °F (-8 °C).

Rainy Weather iconPrecipitation

4.7 in total precipitation 118 mm
19 days of rain

Half the time, Portland receives 3.3 to 5.2 inches (85 to 133 mm) of rainfall in March. One in four years has drier weather, while another one in four is wetter. In rare years, Portland gets a light snowfall in March.

Sunny Weather iconSun

48 % sunshine
3 days clear skies

The sun's rays reach the ground in Portland during 48 percent of daylight hours on average in March, for a total of 178 hours in the month. Typically on 3 days this month the sky is mainly clear, with at most 30 percent cloud cover.

Sunlight in March at Portland lasts for 11 hours and 57 minutes a day on average. The shortest day of the month is the 1st with 11 hours and 10 minutes of daylight. By the end of the month, the days have lengthened to 12:46 from sunrise to sunset. These durations can vary by a minute or two from year to year.

Humid Weather iconHumidity

75 % March average humidity

The relative humidity in Portland during March usually peaks at 87 percent in the morning then drops to 59 percent by mid afternoon.

Local Time1 am4 am7 am10 am1 pm4 pm7 pm10 pm
Humidity % 83 85 87 75 63 59 68 77

Windy Weather iconWind

8.3 mph March wind speed average 13.4 kph

March is a little windier than most other months in Portland.

Stormy Weather iconStorms

3 days rainfall of 0.5 inches (13 mm) or more
1 day with thunderstorms in March

In some years, a rainstorm drops an inch (25 mm) or more of water in a day on Portland during March. A March thunderstorm passes over the city in most, but not all, years.


The weather data here are long-term averages provided by the US National Centers for Environmental Information (NCEI). Temperature and precipitation are 1991-2020 normals while humidity and thunderstorms are 1961-1990 normals.

Portland Weather
Back to Top