Get the monthly weather forecast for Portland, ME, including daily high/low, historical averages, to help you plan ahead.

August weather in Portland Maine, United States. Daily high temperatures decrease by 4°F, from 78°F to 74°F, rarely falling below 66°F or exceeding 86°F.

The weather in Portland in August is pleasantly warm and humid but cool, with average highs of 75°F (24°C) and lows of 62°F (17°C).

Portland, ME Daily Records for AUGUST. High Temperatures. Record High. Record Cool High ... Portland, ME Daily Records for AUGUST. Precipitation. Precipitation.

Portland Weather in August, USA ; Temperature. 19°C ; High Temperature. 25°C ; Low Temperature. 14°C ; Rainfall Days. 13 days ; Rainfall. 120 mm ...

Get the monthly weather forecast for South Portland, ME, including daily high/low, historical averages, to help you plan ahead.

August weather in South Portland Maine, United States. Daily high temperatures decrease by 4°F, from 78°F to 74°F, rarely falling below 66°F or exceeding 86°F.

Clear to partly cloudy. Low 39F. Winds NW at 5 to 10 mph. Record Low12°.

How hot is it in Portland in August? Daytime temperatures usually reach 25°C in Portland in August with low heat and humidity, falling to 14°C at night.