Saint Helens monthly weather averages

Contents

Average daytime temperature

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

Saint Helens average temperature chart (Celsius) Saint Helens average temperature chart (Fahrenheit)
Average monthly temperatures in Saint Helens (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 6.4 6.7 8.8 11.5 15.3 18 19.3 19.2 17 13.8 9.4 7.1
°F 43.6 44 47.8 52.7 59.5 64.4 66.8 66.5 62.7 56.9 48.9 44.8

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.

Saint Helens monthly rainfall chart (mm) Saint Helens monthly rainfall chart (inches)
Average monthly rainfall in Saint Helens (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 71 51 60 54 61 66 61 77 76 83 84 78
inches 2.8 2 2.4 2.1 2.4 2.6 2.4 3 3 3.3 3.3 3.1
Rainy days 19 14 17 15 15 14 13 16 16 17 18 18

Average annual rainfall in Saint Helens: 870.667mm (342.8 inches)

Average daily sunshine

The bar chart below shows the average daily sunshine hours in Saint Helens

Saint Helens average daily sunshine chart
Average daily sunshine Saint Helens
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 1.8 2.6 3.6 5.2 6.5 6.7 6 5.6 4.5 3.3 2.3 1.6

Day / night temperatures

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

Saint Helens average minimum / maximum temperatures (Celsius) Saint Helens average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Saint Helens (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C 1.5 1.4 2.7 4.3 7.3 10.2 11.9 11.9 10 7.6 3.9 2.2
Max °C 6.6 6.8 9 11.7 15.5 18.2 19.5 19.4 17.2 14 9.5 7.3
Min °F 34.6 34.5 36.8 39.7 45.1 50.4 53.4 53.3 50 45.7 39 35.9
Max °F 39.2 39.4 42.4 46.4 52.5 57.6 60.3 60.1 56.5 51.4 44.1 40.5

Sea temperature

The graph below shows the average sea temperature.

Saint Helens average sea temperature chart (Celsius) Saint Helens average sea temperature chart (Fahrenheit)
Average sea temperature around Saint Helens in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 8.3 7.3 7.2 8 10 12.3 14.4 15.3 14.7 13.4 11.7 9.9
°F 46.9 45.1 44.9 46.5 49.9 54.2 57.9 59.5 58.4 56 53 49.8

Wind speed

The graph below shows the average wind speed.

Saint Helens average winspeed by month (km/h) Saint Helens average winspeed by month (mph)
Average wind speed in Saint Helens (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 19 18 19 17 17 16 15 15 16 16 18 18
mph 12 11 12 11 10 10 9 9 10 10 11 11

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.

Saint Helens relative humidity averages
Average relative humidity in Saint Helens
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
87% 86% 82% 79% 76% 77% 79% 80% 83% 86% 87% 90%

Other monthly averages

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Beta

Current (hourly) weather 15 day forecast

Saint Helens weather stats

Saint Helens weather statistics
Hottest month: July 19.3°C 66.7°F
Driest month: February 51mm 2ins
Sunniest month: May 6.5hrs
Coldest month: January 6.4°C 43.5°F
Wettest month: November 84mm 3.3ins
Warmest sea: August 15.3°C 59.5°F
Map showing location of Saint Helens (53.45, -2.73333) Saint Helens map pin © Google

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