Portland (OR) monthly weather averages

Contents

Average daytime temperature

The bar chart below shows the average monthly peak daytime temperatures at Portland

Portland average temperature chart (Celsius) Portland average temperature chart (Fahrenheit)
Average monthly temperatures in Portland (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 7 9.8 12.3 14.9 18.4 22.1 25.2 25.5 22.6 16.9 10.7 7
°F 44.7 49.6 54.2 58.8 65.2 71.8 77.4 77.9 72.6 62.5 51.2 44.7

Please note: these are the average peak daytime temperatures (usually around mid-afternoon) so do not show daytime / night highs and lows. To see the daily range of temperatures have a look at the temperature max / min chart below.

Average rainfall & rainy days

The graph below shows the average rainfall and number of rainy days per month.

Portland monthly rainfall chart (mm) Portland monthly rainfall chart (inches)
Average monthly rainfall in Portland (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 163 118 107 72 57 42 18 28 47 84 156 179
inches 6.4 4.6 4.2 2.8 2.3 1.7 0.7 1.1 1.9 3.3 6.1 7.1
Rainy days 18 16 17 14 12 9 4 5 8 12 19 19

Average annual rainfall in Portland: 993.933mm (391.3 inches)

Average daily sunshine

The bar chart below shows the average daily sunshine hours in Portland

Portland average daily sunshine chart
Average daily sunshine Portland
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 3.1 4.5 6.6 7.8 9.4 10.3 11.4 10.3 8.5 5.4 2.9 2.3

Day / night temperatures

The graph below shows the daily range of temperatures for each month.

Portland average minimum / maximum temperatures (Celsius) Portland average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Portland (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C 0.2 1.4 2.7 4.1 6.9 10 11.7 11.8 9.3 5.8 3.2 0.8
Max °C 7.2 10 12.6 15.2 18.7 22.4 25.6 25.9 22.9 17.2 10.9 7.2
Min °F 32.4 34.5 36.8 39.3 44.4 50 53 53.2 48.7 42.4 37.7 33.4
Max °F 38.7 42.3 45.7 49.3 55 61.2 65.5 65.8 61 52.7 44.6 39.2

Sea temperature

The graph below shows the average sea temperature.

Portland average sea temperature chart (Celsius) Portland average sea temperature chart (Fahrenheit)
Average sea temperature around Portland in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 9.1 9 9.1 9.5 10.4 11.7 12.9 13.5 13.3 12 10.7 9.6
°F 48.3 48.1 48.4 49.1 50.7 53.1 55.3 56.3 55.9 53.6 51.2 49.2

Wind speed

The graph below shows the average wind speed.

Portland average winspeed by month (km/h) Portland average winspeed by month (mph)
Average wind speed in Portland (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 16 15 14 13 13 13 13 12 12 11 14 15
mph 10 9 9 8 8 8 8 8 7 7 9 9

A monthly average windspeed of over 16km/h or 10mph suggests a location is fairly windy.

Relative humidity

The graph below shows the average relative humidity.

Portland relative humidity averages
Average relative humidity in Portland
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
82% 79% 75% 72% 69% 67% 64% 66% 70% 78% 83% 84%

Other monthly averages

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Portland weather stats

Portland weather statistics
Hottest month: August 25.5°C 77.9°F
Driest month: July 18mm 0.7ins
Sunniest month: July 11.4hrs
Coldest month: January 7°C 44.6°F
Wettest month: December 179mm 7ins
Warmest sea: August 13.5°C 56.3°F
Map showing location of Portland (45.52345, -122.67621) Portland map pin © Google

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