Portsmouth (OH) 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 3.8 5.9 12.3 18.1 23.4 27.7 29.5 28.9 25.5 19.5 12.9 6.5
°F 38.9 42.7 54.2 64.6 74.2 81.9 85.2 84 77.9 67.1 55.1 43.7

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.

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 77 73 99 92 111 91 108 101 82 63 77 80
inches 3 2.9 3.9 3.6 4.4 3.6 4.3 4 3.2 2.5 3 3.2
Rainy days 13 12 14 13 12 11 11 10 9 9 11 13

Average annual rainfall in Portsmouth: 1007.833mm (396.8 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 4.3 5.1 6.1 7.5 8.5 9.2 8.9 8.5 7.7 6.7 4.4 3.6

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 -6.5 -5.2 0.4 5.2 10.3 14.6 17 16 12.2 5.6 0.9 -3.8
Max °C 4.1 6.2 12.6 18.5 23.8 28.1 29.9 29.2 25.8 19.9 13.2 6.8
Min °F 20.3 22.6 32.7 41.3 50.5 58.2 62.5 60.8 54 42 33.5 25.3
Max °F 29.8 32.9 43.7 53.2 62.6 70.3 74.1 72.7 66.2 54.9 44.6 34.7

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 7.6 6.7 6.8 9 13.7 19.6 24 24.9 22.9 18.4 13.7 9.8
°F 45.7 44.1 44.3 48.2 56.7 67.3 75.2 76.8 73.3 65.1 56.6 49.7

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 15 15 16 15 12 11 10 10 10 12 14 15
mph 9 9 10 9 8 7 6 6 6 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.

Portsmouth relative humidity averages
Average relative humidity in Portsmouth
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
70% 68% 64% 61% 68% 71% 74% 75% 76% 70% 70% 72%

Other monthly averages

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Beta

Current (hourly) weather 15 day forecast

Portsmouth weather stats

Portsmouth weather statistics
Hottest month: July 29.5°C 85.1°F
Driest month: October 63mm 2.5ins
Sunniest month: June 9.2hrs
Coldest month: January 3.8°C 38.8°F
Wettest month: May 111mm 4.4ins
Warmest sea: August 24.9°C 76.8°F
Map showing location of Portsmouth (38.73174, -82.99767) Portsmouth map pin © Google

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