Cornwall monthly weather averages

Contents

Average daytime temperature

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

Cornwall average temperature chart (Celsius) Cornwall average temperature chart (Fahrenheit)
Average monthly temperatures in Cornwall (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C -3.4 -3.3 0.8 6.5 13.7 19.5 23.1 22.6 17.8 11.9 5.9 -0.2
°F 26 26.1 33.5 43.7 56.7 67.1 73.6 72.7 64.1 53.4 42.6 31.6

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.

Cornwall monthly rainfall chart (mm) Cornwall monthly rainfall chart (inches)
Average monthly rainfall in Cornwall (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 106 87 86 86 91 87 80 89 89 110 118 122
inches 4.2 3.4 3.4 3.4 3.6 3.4 3.2 3.5 3.5 4.3 4.6 4.8
Rainy days 16 14 14 14 14 12 11 12 12 14 16 19

Average annual rainfall in Cornwall: 1135mm (446.9 inches)

Average daily sunshine

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

Cornwall average daily sunshine chart
Average daily sunshine Cornwall
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 3.7 4.5 4.8 5.5 6.9 8.3 8.7 7.9 6.1 4.5 3.1 2.5

Day / night temperatures

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

Cornwall average minimum / maximum temperatures (Celsius) Cornwall average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Cornwall (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C -11.9 -11.7 -6.8 -1.1 4.3 10.1 14.1 13.8 9.4 4.3 -0.5 -7.8
Max °C -3.2 -3.1 1 6.7 14 19.8 23.4 22.8 18.1 12.1 6.1 -0
Min °F 10.7 10.9 19.8 30 39.7 50.1 57.3 56.8 48.8 39.7 31.2 18.1
Max °F 18.5 18.7 26.8 37 48.4 58.8 65.7 64.9 56.7 46.8 37 25

Sea temperature

The graph below shows the average sea temperature.

Cornwall average sea temperature chart (Celsius) Cornwall average sea temperature chart (Fahrenheit)
Average sea temperature around Cornwall in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 0.5 -0.6 -0.5 0.9 4.6 10.1 15.5 17.4 15.1 11.4 7.1 3
°F 32.8 30.9 31.1 33.6 40.3 50.1 59.9 63.3 59.1 52.4 44.7 37.4

Wind speed

The graph below shows the average wind speed.

Cornwall average winspeed by month (km/h) Cornwall average winspeed by month (mph)
Average wind speed in Cornwall (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 20 20 20 19 18 17 16 15 16 18 19 20
mph 13 12 13 12 11 10 10 9 10 11 12 13

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.

Cornwall relative humidity averages
Average relative humidity in Cornwall
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
80% 79% 80% 78% 75% 77% 79% 79% 79% 80% 82% 82%

Other monthly averages

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Beta

Current (hourly) weather 15 day forecast

Cornwall weather stats

Cornwall weather statistics
Hottest month: July 23.1°C 73.6°F
Driest month: July 80mm 3.1ins
Sunniest month: July 8.7hrs
Coldest month: January -3.4°C 25.9°F
Wettest month: December 122mm 4.8ins
Warmest sea: August 17.4°C 63.3°F
Map showing location of Cornwall (46.22652, -63.21809) Cornwall map pin © Google

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