Chehalis (WA) monthly weather averages

Contents

Average daytime temperature

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

Chehalis average temperature chart (Celsius) Chehalis average temperature chart (Fahrenheit)
Average monthly temperatures in Chehalis (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 7 9.7 12.1 14.8 18.5 21.8 24.4 24.7 21.7 16.1 10.2 7.1
°F 44.6 49.5 53.8 58.7 65.2 71.2 76 76.5 71 61 50.4 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.

Chehalis monthly rainfall chart (mm) Chehalis monthly rainfall chart (inches)
Average monthly rainfall in Chehalis (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 192 140 131 91 61 53 23 36 58 113 189 198
inches 7.6 5.5 5.1 3.6 2.4 2.1 0.9 1.4 2.3 4.4 7.4 7.8
Rainy days 19 17 18 15 12 9 5 6 9 13 20 21

Average annual rainfall in Chehalis: 1206.766mm (475.1 inches)

Average daily sunshine

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

Chehalis average daily sunshine chart
Average daily sunshine Chehalis
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 2.8 4.3 6.1 7.4 8.8 9.5 10.8 9.7 8 5.1 2.8 2.2

Day / night temperatures

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

Chehalis average minimum / maximum temperatures (Celsius) Chehalis average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Chehalis (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C 0.5 1.3 2.1 3.5 6.3 9.1 10.9 11 8.6 5.4 3 1
Max °C 7.2 9.9 12.4 15.1 18.8 22.1 24.8 25.1 22 16.4 10.4 7.2
Min °F 32.8 34.3 35.7 38.3 43.3 48.4 51.5 51.7 47.5 41.7 37.4 33.8
Max °F 38.8 42.1 45 48.7 54.5 60.1 64 64.4 59.5 51.6 44.1 39.4

Sea temperature

The graph below shows the average sea temperature.

Chehalis average sea temperature chart (Celsius) Chehalis average sea temperature chart (Fahrenheit)
Average sea temperature around Chehalis in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 8.6 8.5 8.7 9.2 10.3 11.7 12.9 13.4 13 11.6 10.2 9.1
°F 47.5 47.3 47.7 48.6 50.6 53 55.2 56.2 55.5 53 50.4 48.4

Wind speed

The graph below shows the average wind speed.

Chehalis average winspeed by month (km/h) Chehalis average winspeed by month (mph)
Average wind speed in Chehalis (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 11 11 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.

Chehalis relative humidity averages
Average relative humidity in Chehalis
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
85% 82% 78% 75% 72% 71% 70% 71% 76% 82% 85% 86%

Other monthly averages

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Beta

Current (hourly) weather 15 day forecast

Chehalis weather stats

Chehalis weather statistics
Hottest month: August 24.7°C 76.5°F
Driest month: July 23mm 0.9ins
Sunniest month: July 10.8hrs
Coldest month: January 7°C 44.6°F
Wettest month: December 198mm 7.8ins
Warmest sea: August 13.4°C 56.1°F
Map showing location of Chehalis (46.66205, -122.96402) Chehalis map pin © Google

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