Yosemite National Park is definitely worth a visit
Vast forests, blue lakes, towering sequoias, and majestic waterfalls hint at the beauty of Yosemite National Park—a true natural masterpiece.
Average monthly water temperature in Portland, the United States of America
On this page you find the mean water temperature over the year in Portland (Maine), the United States of America. Take a closer look at the water temperature patterns and what they mean for swimming and recreation.
In Portland, water temperatures remain cool throughout the year. The warmest month is August, with an average water temperature of 18°C (64°F).
The coldest water temperature month is March, with an average temperature of 3°C (37°F). This temperature is not very suitable for swimming.
Portland Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Portland - and find the best time to visit.
Portland 3-Day Forecast
More climate data for Portland
Temperature Rainfall Sunshine Humidity Water Temp
See the full Portland climate overview or explore weather in the United States of America.
Popular in September
Where to go in September - average daytime high across popular destinations.
Bucket list
Need travel inspiration? Check out our bucket list articles and be inspired.
Yosemite National Park is definitely worth a visit
The 10 most alternative cities in the United States
Discover the top 10 fun and alternative U.S. cities rich in art, culture, and adventure. From Portland's hippy charm to Sedona's stunning landscapes.
Sedona: Explore Majestic Red Rock Landscapes
A picturesque artists' town surrounded by red rocks and known for its spirituality, vortex energy, and stunning hikes like Cathedral Rock.
10 most idyllic villages to visit in the United States
Discover 10 idyllic villages in the USA, from California to Vermont. Explore their unique charm, rich history, stunning nature, and vibrant arts scenes.