Portland (Maine) weather by month & the best time to visit
United States · seaside town · oceanic / maritime climate
The best time to visit Portland (Maine) is July — its sunniest month (Sunshine Score 74/100), with August close behind. Portland (Maine) averages about 2,150 hours of sunshine a year. Daytime highs around 21°C / 70°F and roughly 96 mm of rain in July.
When is the best time to visit Portland (Maine)?
For sunshine, the best time to visit Portland (Maine) is July, then August. The dullest month is January (0/100, 103 mm of rain). The full month-by-month picture is in the table below.
How sunny is Portland (Maine)?
Portland (Maine) gets a moderate 2,150 hours of sunshine a year. 74 Sunshine Score points separate July (74) from January (0), so the month you pick matters. It ranks #344 of 580 destinations in United States for annual sunshine, below the national median of 2,279 hours. The year's 1,363 mm of rain spreads fairly evenly across the months, with no pronounced dry season.
Sunshine Score by month
| Month | Score | Day high | Night low | Rain | UV | Sea |
|---|---|---|---|---|---|---|
| January | 0 | 1° / 34°F | -4° / 25°F | 103 mm | 1 | 5° / 41°F |
| February | 0 | 1° / 34°F | -4° / 25°F | 103 mm | 2 | 3° / 37°F |
| March | 0 | 4° / 39°F | -1° / 30°F | 110 mm | 3 | 4° / 39°F |
| April | 0 | 8° / 46°F | 4° / 39°F | 121 mm | 4 | 7° / 45°F |
| May | 24 | 12° / 54°F | 8° / 46°F | 101 mm | 5 | 12° / 54°F |
| June | 51 | 17° / 63°F | 13° / 55°F | 127 mm | 6 | 17° / 63°F |
| July | 74 | 21° / 70°F | 17° / 63°F | 96 mm | 7 | 18° / 64°F |
| August | 74 | 21° / 70°F | 17° / 63°F | 94 mm | 6 | 20° / 68°F |
| September | 61 | 18° / 64°F | 14° / 57°F | 97 mm | 5 | 18° / 64°F |
| October | 27 | 13° / 55°F | 10° / 50°F | 145 mm | 3 | 14° / 57°F |
| November | 6 | 9° / 48°F | 4° / 39°F | 125 mm | 1 | 10° / 50°F |
| December | 0 | 4° / 39°F | 0° / 32°F | 141 mm | 1 | 7° / 45°F |
Sea temperature in Portland (Maine) by month
The sea off Portland (Maine) is warmest in August at around 20°C / 68°F, and coolest in February at 3°C / 37°F. It never reaches comfortable swimming temperatures (21°C+). Month-by-month sea-surface temperatures are in the Sea column of the table above.
Nearest destinations
Head-to-head
How Portland (Maine) compares month by month: Portland (Maine) vs Boston · Portland (Maine) vs Manchester (New Hampshire) · Portland (Maine) vs Bangor · all comparisons
Portland (Maine): questions and answers
What kind of destination is Portland (Maine)?
Portland (Maine) is a seaside town in United States with a oceanic / maritime climate — the sea reaches 20°C at its warmest.
How many hours of sunshine does Portland (Maine) get a year?
Portland (Maine) gets about 2,150 hours of sunshine a year, at its best around July.
When is the best time to visit Portland (Maine)?
The sunniest time to visit Portland (Maine) is July, when the Sunshine Score peaks at 74/100 (with August close behind). Expect daytime highs around 21°C / 70°F.
What is the least sunny month in Portland (Maine)?
January is the least sunny month in Portland (Maine), scoring 0/100 with about 103 mm of rain.
What is the sea temperature in Portland (Maine)?
The sea in Portland (Maine) ranges from about 3°C (February) to 20°C (August). Month-by-month sea temperatures are on this page.
How strong is the sun in Portland (Maine)?
The typical midday UV index in Portland (Maine) peaks around 7 (high) in July, easing to about 1 (low) in January. Month-by-month midday UV values are in the UV column of the table on this page.
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