West Lake Sammamish (WA) monthly weather averages

Contents

Average daytime temperature

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

West Lake Sammamish average temperature chart (Celsius) West Lake Sammamish average temperature chart (Fahrenheit)
Average monthly temperatures in West Lake Sammamish (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 6.7 9.5 11.1 13.6 17.2 20.3 23.1 23.1 20 15.1 9.9 7.1
°F 44.1 49 52 56.5 62.9 68.5 73.6 73.5 68.1 59.2 49.8 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.

West Lake Sammamish monthly rainfall chart (mm) West Lake Sammamish monthly rainfall chart (inches)
Average monthly rainfall in West Lake Sammamish (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 180 128 123 92 68 59 30 41 66 108 177 186
inches 7.1 5.1 4.8 3.6 2.7 2.3 1.2 1.6 2.6 4.3 7 7.3
Rainy days 17 15 16 13 10 8 5 6 9 12 17 18

Average annual rainfall in West Lake Sammamish: 1182.5mm (465.6 inches)

Average daily sunshine

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

West Lake Sammamish average daily sunshine chart
Average daily sunshine West Lake Sammamish
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 2.5 4.1 5.9 7.2 8.6 9.4 10.8 9.8 7.8 5.1 2.7 2

Day / night temperatures

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

West Lake Sammamish average minimum / maximum temperatures (Celsius) West Lake Sammamish average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in West Lake Sammamish (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C 1 2.2 2.7 4.4 7 10.1 11.8 11.9 9.7 6.5 3.6 1.6
Max °C 6.9 9.7 11.3 13.9 17.4 20.6 23.4 23.4 20.3 15.4 10.1 7.2
Min °F 33.7 35.9 36.9 39.8 44.6 50.1 53.2 53.3 49.5 43.6 38.4 34.9
Max °F 39 42.6 44.6 48.4 54 59.5 63.7 63.7 59 51.6 44.2 39.9

Sea temperature

The graph below shows the average sea temperature.

West Lake Sammamish average sea temperature chart (Celsius) West Lake Sammamish average sea temperature chart (Fahrenheit)
Average sea temperature around West Lake Sammamish in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 8.1 8 8.3 9.1 10.5 12 13.1 13.4 12.8 11.2 9.7 8.6
°F 46.5 46.4 47 48.4 50.9 53.6 55.5 56.2 55.1 52.1 49.5 47.5

Wind speed

The graph below shows the average wind speed.

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

West Lake Sammamish relative humidity averages
Average relative humidity in West Lake Sammamish
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
79% 76% 73% 69% 67% 66% 64% 67% 72% 78% 80% 81%

Other monthly averages

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

West Lake Sammamish weather stats

West Lake Sammamish weather statistics
Hottest month: July 23.1°C 73.6°F
Driest month: July 30mm 1.2ins
Sunniest month: July 10.8hrs
Coldest month: January 6.7°C 44.1°F
Wettest month: December 186mm 7.3ins
Warmest sea: August 13.4°C 56.1°F
Map showing location of West Lake Sammamish (47.5776, -122.10123) West Lake Sammamish map pin © Google

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