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 weather for Portland.

You can jump directly to data and descriptions for:

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

57 °F March average high 14 °C
39 °F March average low 4 °C

In most years, Portland averages a daily maximum temperature for March that's between 54 and 59 degrees Fahrenheit (12 to 15 degrees Celsius). The minimum temperature usually falls between 37 and 41 °F (3 to 5 °C).

The days at Portland continue to warm steadily during March. By the end of the month, the temperature has climbed around 5 °F (3 °C) above what it was at the start.

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 °F (10 °C) 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

4.5 in total precipitation 114 mm
19 days of rain

Half the time, Portland receives 4 to 5 inches (94 to 124 mm) of rainfall in March. One in four years has drier weather, while another one in four is wetter. About once a decade, 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.


These weather data are long-term historical averages provided by the National Climatic Data Center of the United States. The temperature and precipitation numbers are 1981-2010 normals while the humidity and thunderstorm statistics are 1961-1990 normals.

Portland Weather
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