Portsmouth monthly weather averages

Contents

Average daytime temperature

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

Portsmouth average temperature chart (Celsius) Portsmouth average temperature chart (Fahrenheit)
Average monthly temperatures in Portsmouth (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 28.2 28.3 29 29.6 30.3 30.6 30.6 30.7 30.8 29.9 29.8 28.9
°F 82.8 83 84.1 85.2 86.5 87 87.1 87.2 87.4 85.8 85.6 84.1

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.

Portsmouth monthly rainfall chart (mm) Portsmouth monthly rainfall chart (inches)
Average monthly rainfall in Portsmouth (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 145 95 110 105 177 173 156 243 269 279 301 201
inches 5.7 3.8 4.3 4.1 7 6.8 6.2 9.6 10.6 11 11.8 7.9
Rainy days 18 14 15 14 17 18 20 20 22 19 19 18

Average annual rainfall in Portsmouth: 2206.766mm (868.8 inches)

Average daily sunshine

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

Portsmouth average daily sunshine chart
Average daily sunshine Portsmouth
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 7.2 7.8 8 8.6 8.3 8.1 8 8.3 7.6 7.6 7.1 6.8

Day / night temperatures

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

Portsmouth average minimum / maximum temperatures (Celsius) Portsmouth average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Portsmouth (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C 21.2 20.9 21.3 21.9 23.2 23.5 23.9 23.8 23.5 23 22.5 21.7
Max °C 28.4 28.5 29.2 29.8 30.5 30.8 30.8 30.9 31 30.1 30 29.1
Min °F 70.2 69.6 70.3 71.3 73.7 74.2 74.9 74.8 74.2 73.3 72.4 71.1
Max °F 76.6 76.5 77.4 78.4 80.2 80.8 81.1 81.1 81 79.7 79.2 77.7

Sea temperature

The graph below shows the average sea temperature.

Portsmouth average sea temperature chart (Celsius) Portsmouth average sea temperature chart (Fahrenheit)
Average sea temperature around Portsmouth in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 26.9 26.5 26.5 27.1 27.7 28.1 28.2 28.7 29 28.9 28.4 27.6
°F 80.4 79.7 79.8 80.8 81.9 82.5 82.8 83.6 84.2 84 83.1 81.7

Wind speed

The graph below shows the average wind speed.

Portsmouth average winspeed by month (km/h) Portsmouth average winspeed by month (mph)
Average wind speed in Portsmouth (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 18 19 19 18 18 21 21 18 15 13 15 17
mph 11 12 12 11 11 13 13 11 9 8 9 10

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.

Portsmouth relative humidity averages
Average relative humidity in Portsmouth
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
78% 77% 76% 77% 78% 79% 80% 80% 81% 82% 81% 80%

Other monthly averages

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Beta

Current (hourly) weather 15 day forecast

Portsmouth weather stats

Portsmouth weather statistics
Hottest month: July 30.6°C 87.1°F
Driest month: February 95mm 3.7ins
Sunniest month: April 8.6hrs
Coldest month: February 28.3°C 82.9°F
Wettest month: November 301mm 11.9ins
Warmest sea: September 29°C 84.2°F
Map showing location of Portsmouth (15.58333, -61.46667) Portsmouth map pin © Google

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