Portland (ME) Climate by Month
The temperature in Portland can vary quite a bit throughout the year.
Temperatures can be warm during the warmest months,
and very cold during the cooler months.
It also has a notably wet climate with much precipitation.
Now, let’s explore all the climate details to give you a full picture.
Average day and night temperature
Visitors to Portland can expect significant temperature changes throughout the year. Average daytime temperatures range from a comfortable 26°C in July, the warmest time of the year, to a very cold 0°C during cooler months like January. At night, temperatures typically average around -9°C during these months.
The mean minimum and maximum temperatures throughout the year
Precipitation and rainy days
Portland is known for its substantial rain/snowfall, with annual precipitation reaching 1415 mm. While rainfall varies throughout the year, each season offers its own charm. June brings wetter days averaging 156 mm of precipitation, spread over 14 rainy days. In contrast, January experiences a drier climate, with about 87 mm of snowfall spread across 11 snowy days.The mean monthly precipitation over the year, including rain, hail and snow
The average number of days each month with precipitation
Sunshine over the year
Seasonal changes in sunshine hours are quite dramatic in Portland. While July receives considerable daily sunshine with up to 9.3 hours, December marks the darkest time of the year, where sunshine is scarce with only 4.7 hours of sunlight per day.Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Average water temperature
The mean water temperature over the year in Portland ranges from 3°C in March to 18°C in August.
Water temperature over the year
Average humidity
The relative humidity is moderate throughout the year in Portland.
Relative humidity over the year
The best time of year to visit Portland in the United States of America
During the months of June, August and September you are most likely to experience good weather with pleasant average temperatures that fall between 20°C and 26°C.Other facts from our historical weather data:
Most rainfall (rainy season) is seen in June and October.
July has an average maximum temperature of 26°C and is the warmest month of the year.
The coldest month is January with an average maximum temperature of 0°C.
June tops the wettest month list with 156 mm of rainfall.
January is the driest month with 87 mm of precipitation.
July is the sunniest month with an average of 278 hours of sunshine.
No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.
