South Portland (ME) monthly weather averages

Contents

Average daytime temperature

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

South Portland average temperature chart (Celsius) South Portland average temperature chart (Fahrenheit)
Average monthly temperatures in South Portland (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C -0.8 0.6 5.3 11.4 17.3 22.5 25.9 25.1 20.7 14.9 8.4 1.8
°F 30.6 33.1 41.6 52.4 63.1 72.6 78.6 77.2 69.3 58.9 47.1 35.3

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.

South Portland monthly rainfall chart (mm) South Portland monthly rainfall chart (inches)
Average monthly rainfall in South Portland (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 94 88 99 105 92 85 78 75 81 100 131 117
inches 3.7 3.5 3.9 4.1 3.6 3.3 3.1 3 3.2 3.9 5.1 4.6
Rainy days 11 10 11 12 12 11 10 10 9 10 12 12

Average annual rainfall in South Portland: 1117.333mm (439.9 inches)

Average daily sunshine

The bar chart below shows the average daily sunshine hours in South Portland

South Portland average daily sunshine chart
Average daily sunshine South Portland
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 5.8 6.6 7 7.6 8.4 9.2 9.7 9.2 8.1 6.8 5.1 5

Day / night temperatures

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

South Portland average minimum / maximum temperatures (Celsius) South Portland average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in South Portland (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C -11.1 -10.1 -4 1.4 6.5 11.4 14.9 14.2 9.8 4 -0.6 -7.7
Max °C -0.5 0.9 5.6 11.6 17.6 22.8 26.2 25.4 21 15.2 8.6 2.1
Min °F 12 13.8 24.9 34.5 43.6 52.5 58.7 57.6 49.6 39.2 30.9 18.2
Max °F 21.6 23.7 33.4 43.7 53.6 62.8 68.9 67.6 59.7 49.3 39.2 27

Sea temperature

The graph below shows the average sea temperature.

South Portland average sea temperature chart (Celsius) South Portland average sea temperature chart (Fahrenheit)
Average sea temperature around South Portland in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 5 3.5 3.2 4.7 8.4 12.8 16.5 17.5 15.5 12.2 9.3 7
°F 40.9 38.3 37.7 40.5 47.1 55.1 61.8 63.4 59.8 53.9 48.7 44.5

Wind speed

The graph below shows the average wind speed.

South Portland average winspeed by month (km/h) South Portland average winspeed by month (mph)
Average wind speed in South Portland (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 16 16 17 17 15 14 13 13 13 14 15 15
mph 10 10 11 11 9 9 8 8 8 9 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.

South Portland relative humidity averages
Average relative humidity in South Portland
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
67% 65% 66% 67% 71% 75% 75% 76% 77% 74% 73% 70%

Other monthly averages

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Beta

Current (hourly) weather 15 day forecast

South Portland weather stats

South Portland weather statistics
Hottest month: July 25.9°C 78.6°F
Driest month: August 75mm 3ins
Sunniest month: August 9.2hrs
Coldest month: January -0.8°C 30.6°F
Wettest month: November 131mm 5.2ins
Warmest sea: August 17.5°C 63.5°F
Map showing location of South Portland (43.64147, -70.24088) South Portland map pin © Google

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