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.
Jump to: month-by-month table · sea temperature · nearby alternatives · embed this data
- Sun hours / year
- 2,150
- Sunniest month
- July
- Peak score
- 74/100
- Rain / year
- 1,363 mm
- Snow / year
- ≈1.5 m
- Midday UV at peak
- 7 (high)
- Sea at warmest
- 20°C / 68°F
- Population
- 67k
- Elevation
- 15 m
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.
See Portland (Maine) on the interactive sunshine globe →
Nearby places for sunshine
- Manchester (New Hampshire) United States · 121 km · best in Sep · 2,158 h sun/yr
- Boston United States · 154 km · best in Jul · 2,157 h sun/yr
- Bangor United States · 175 km · best in Jul · 2,079 h sun/yr
- Providence/Warwick United States · 232 km · best in Aug · 2,279 h sun/yr
- Burlington United States · 245 km · best in Sep · 1,916 h sun/yr
- Martha's Vineyard United States · 252 km · best in Jul · 2,196 h sun/yr
Nearest destinations
- Portsmouth United States · 76 km · 2,149 h sun/yr · best in Jul
- Rockland United States · 107 km · 2,138 h sun/yr · best in Jul
- Bedford United States · 153 km · 2,157 h sun/yr · best in Jul
- Lebanon United States · 161 km · 2,016 h sun/yr · best in Sep
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
Put the Portland (Maine) sunshine badge on your site
A compact badge showing Portland (Maine)'s sunshine at a glance — free to embed under CC BY 4.0. Paste this wherever you'd like it to appear:
Live preview — this is exactly what your readers see: