Hermiston (OR) monthly weather averages

Contents

Average daytime temperature

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

Hermiston average temperature chart (Celsius) Hermiston average temperature chart (Fahrenheit)
Average monthly temperatures in Hermiston (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 5 9.4 13.8 17.9 22.7 27.3 31.2 30.4 25.5 18.7 10.3 5.3
°F 40.9 48.9 56.8 64.2 72.9 81.1 88.1 86.8 78 65.6 50.6 41.5

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.

Hermiston monthly rainfall chart (mm) Hermiston monthly rainfall chart (inches)
Average monthly rainfall in Hermiston (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 31 21 19 16 18 13 5 9 10 17 30 33
inches 1.2 0.8 0.8 0.6 0.7 0.5 0.2 0.3 0.4 0.7 1.2 1.3
Rainy days 11 10 9 7 6 5 2 3 4 5 11 11

Average annual rainfall in Hermiston: 147.367mm (58 inches)

Average daily sunshine

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

Hermiston average daily sunshine chart
Average daily sunshine Hermiston
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 2.2 3.8 6.3 8.1 10 11.5 13.1 11.8 9.6 6.9 2.7 1.8

Day / night temperatures

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

Hermiston average minimum / maximum temperatures (Celsius) Hermiston average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Hermiston (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C -2.6 -0.7 1.3 4 7.9 11.8 14.2 13.6 9.1 3.6 0.9 -2.3
Max °C 5.2 9.7 14.1 18.3 23.1 27.7 31.6 30.9 26 19.1 10.6 5.5
Min °F 27.4 30.8 34.3 39.1 46.2 53.2 57.6 56.4 48.3 38.4 33.5 28
Max °F 34.3 40.1 45.9 52 59.9 67.5 73.2 72 63.5 52.3 42.3 34.9

Sea temperature

The graph below shows the average sea temperature.

Hermiston average sea temperature chart (Celsius) Hermiston average sea temperature chart (Fahrenheit)
Average sea temperature around Hermiston in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 8.8 8.7 8.8 9 9.8 11.3 12.9 13.8 13.4 12.1 10.5 9.3
°F 47.9 47.7 47.8 48.3 49.7 52.3 55.2 56.8 56.1 53.7 50.9 48.7

Wind speed

The graph below shows the average wind speed.

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

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.

Hermiston relative humidity averages
Average relative humidity in Hermiston
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
78% 74% 64% 57% 52% 47% 38% 41% 49% 61% 75% 79%

Other monthly averages

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Beta

Current (hourly) weather 15 day forecast

Hermiston weather stats

Hermiston weather statistics
Hottest month: July 31.2°C 88.2°F
Driest month: July 5mm 0.2ins
Sunniest month: July 13.1hrs
Coldest month: January 5°C 41°F
Wettest month: December 33mm 1.3ins
Warmest sea: August 13.8°C 56.8°F
Map showing location of Hermiston (45.84041, -119.28946) Hermiston map pin © Google

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