Lake Oswego (OR) monthly weather averages

Contents

Average daytime temperature

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

Lake Oswego average temperature chart (Celsius) Lake Oswego average temperature chart (Fahrenheit)
Average monthly temperatures in Lake Oswego (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 7 9.8 12.3 15 18.6 22.4 25.7 26 22.9 17.1 10.7 7
°F 44.6 49.6 54.2 59.1 65.4 72.4 78.3 78.8 73.2 62.7 51.3 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.

Lake Oswego monthly rainfall chart (mm) Lake Oswego monthly rainfall chart (inches)
Average monthly rainfall in Lake Oswego (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 175 127 118 77 61 44 18 29 50 88 168 193
inches 6.9 5 4.6 3 2.4 1.7 0.7 1.1 2 3.5 6.6 7.6
Rainy days 18 16 17 14 12 8 4 5 8 12 18 19

Average annual rainfall in Lake Oswego: 1071.267mm (421.8 inches)

Average daily sunshine

The bar chart below shows the average daily sunshine hours in Lake Oswego

Lake Oswego average daily sunshine chart
Average daily sunshine Lake Oswego
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 3.1 4.5 6.6 7.9 9.5 10.5 11.6 10.5 8.7 5.5 3 2.4

Day / night temperatures

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

Lake Oswego average minimum / maximum temperatures (Celsius) Lake Oswego average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Lake Oswego (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C 0.3 1.4 2.5 3.9 6.6 9.7 11.3 11.5 9.2 5.7 3.1 0.8
Max °C 7.2 10 12.6 15.3 18.9 22.8 26.1 26.4 23.3 17.4 10.9 7.2
Min °F 32.5 34.5 36.4 39 43.8 49.4 52.3 52.6 48.5 42.2 37.6 33.4
Max °F 38.7 42.3 45.5 49.3 54.9 61.2 65.7 66 61.2 52.7 44.6 39.2

Sea temperature

The graph below shows the average sea temperature.

Lake Oswego average sea temperature chart (Celsius) Lake Oswego average sea temperature chart (Fahrenheit)
Average sea temperature around Lake Oswego 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.

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

Lake Oswego relative humidity averages
Average relative humidity in Lake Oswego
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
82% 79% 75% 72% 69% 67% 63% 65% 69% 78% 83% 84%

Other monthly averages

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Lake Oswego weather stats

Lake Oswego weather statistics
Hottest month: August 26°C 78.8°F
Driest month: July 18mm 0.7ins
Sunniest month: July 11.6hrs
Coldest month: January 7°C 44.6°F
Wettest month: December 193mm 7.6ins
Warmest sea: August 13.5°C 56.3°F
Map showing location of Lake Oswego (45.42067, -122.67065) Lake Oswego map pin © Google

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