Kennewick (WA) monthly weather averages

Average daytime temperature

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

Kennewick average temperature chart (Celsius) Kennewick average temperature chart (Fahrenheit)
Average monthly temperatures in Kennewick (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 4.5 9.1 14.4 18.9 23.7 28.1 31.8 31.1 25.8 18.7 10.1 4.8
°F 40 48.3 57.9 65.9 74.6 82.5 89.2 88.1 78.5 65.6 50.2 40.6

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.

Kennewick monthly rainfall chart (mm) Kennewick monthly rainfall chart (inches)
Average monthly rainfall in Kennewick (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 27 18 17 13 16 11 5 8 9 15 26 28
inches 1.1 0.7 0.7 0.5 0.6 0.4 0.2 0.3 0.4 0.6 1 1.1
Rainy days 11 9 9 7 7 5 3 3 4 5 11 11

Average annual rainfall in Kennewick: 121.267mm (47.7 inches)

Average daily sunshine

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

Kennewick average daily sunshine chart
Average daily sunshine Kennewick
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 2.1 3.6 6.2 8 9.9 11.5 13 11.7 9.5 6.7 2.6 1.7

Day / night temperatures

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

Kennewick average minimum / maximum temperatures (Celsius) Kennewick average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Kennewick (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C -2.9 -0.7 1.7 4.6 8.4 12.6 15 14.7 9.8 4.4 1.3 -2.4
Max °C 4.7 9.3 14.7 19.2 24.1 28.5 32.2 31.6 26.2 19 10.4 5
Min °F 26.9 30.7 35.1 40.3 47 54.6 59 58.4 49.6 39.9 34.3 27.8
Max °F 33.6 39.7 46.8 53.4 61.2 68.9 74.5 73.6 64.4 53.1 42.4 34.3

Sea temperature

The graph below shows the average sea temperature.

Kennewick average sea temperature chart (Celsius) Kennewick average sea temperature chart (Fahrenheit)
Average sea temperature around Kennewick in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 8.3 8.3 8.3 8.6 9.4 10.9 12.5 13.4 13 11.6 10 8.8
°F 47 46.9 47 47.5 49 51.6 54.6 56.2 55.4 52.9 50 47.9

Wind speed

The graph below shows the average wind speed.

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

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.

Kennewick relative humidity averages
Average relative humidity in Kennewick
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
78% 74% 64% 57% 52% 47% 39% 41% 50% 61% 75% 80%