Winter
Dec → Feb0 to 4°
nights -9 to -5°
- 9 rainy days · 98 mm
When is the best time to visit Portland, Maine?
- Jan0°not recommended
- Feb2°not recommended
- Mar6°not recommended
- Apr12°not recommended
- May18°fair
- Jun23°recommended
- Jul26°recommended
- Aug26°recommended
- Sep22°recommended
- Oct15°recommended
- Nov9°fair
- Dec4°not recommended
RecommendedFairNot recommended· afternoon temperature
The weather in Portland, Maine, month by month
The table of averages, month by month
| Month | High | Low | Rainfall | Rainy days | Best |
|---|---|---|---|---|---|
| January | 0° | -9° | 89 mm | 9 d | |
| February | 2° | -8° | 90 mm | 8 d | |
| March | 6° | -3° | 104 mm | 9 d | |
| April | 12° | 2° | 112 mm | 9 d | |
| May | 18° | 8° | 93 mm | 9 d | |
| June | 23° | 13° | 105 mm | 9 d | ✓ |
| July | 26° | 16° | 87 mm | 8 d | ✓ |
| August | 26° | 15° | 91 mm | 7 d | ✓ |
| September | 22° | 11° | 96 mm | 7 d | ✓ |
| October | 15° | 5° | 133 mm | 8 d | ✓ |
| November | 9° | 0° | 108 mm | 8 d | |
| December | 4° | -5° | 114 mm | 10 d |
The four seasons in Portland, Maine, in figures
What the 2015-2024 averages (Portland Jetport (Maine)) show, season by season, to compare at a glance instead of reading twelve rows of a table.
Spring
Mar → May6 to 18°
nights -3 to 8°
- 9 rainy days · 103 mm
Summer
Jun → Aug23 to 26°
nights 13 to 16°
- 8 rainy days · 94 mm
Autumn
Sep → Nov9 to 22°
nights 0 to 11°
- 8 rainy days · 112 mm
Book early for June to October
The timing is right, so it is right for everyone: in these months the best places to stay and the small-group tours go first. Here is where to start.
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Daylight in Portland, Maine, month by month
The time between sunrise and sunset, from shortest to longest. Not to be confused with the sunshine hours in the table above, which count clear skies. In June there are 15h25 of daylight, in December 8h57, a difference of 6h29.
9h16Jan
10h26Feb
11h48Mar
13h22Apr
14h42May
15h25Jun
15h07Jul
13h58Aug
12h26Sep
10h55Oct
9h36Nov
8h57Dec
Calculated for the latitude of the reference point "Portland Jetport (Maine)" (43.65°). Values on the 15th of each month, local solar time.
What to do in Portland, Maine, month by month
| Activity | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sightseeing & walks | ||||||||||||
| Long days |
favourablewith compromisesunfavourable
- Sightseeing & walks: April, May, June, July, August, September, October, November
- Long days: May, June, July
Grid derived from the climate averages (temperature, rainfall), not from an opinion.
Travelling off-peak
Month by month, in detail
January
Not recommended0°-9° at night
- 89 mm · 9 d
Low season, lower prices
February
Not recommended2°-8° at night
- 90 mm · 8 d
Low season, lower prices
March
Not recommended6°-3° at night
- 104 mm · 9 d
Low season, lower prices
April
Not recommended12°2° at night
- 112 mm · 9 d
Low season, lower prices
May
Fair18°8° at night
- 93 mm · 9 d
Low season, lower prices
June
Recommended23°13° at night
- 105 mm · 9 d
Busy, without the crush
July
Recommended26°16° at night
- 87 mm · 8 d
High season, book early
August
Recommended26°15° at night
- 91 mm · 7 d
High season, book early
September
Recommended22°11° at night
- 96 mm · 7 d
Busy, without the crush
October
Recommended15°5° at night
- 133 mm · 8 d
Busy, without the crush
November
Fair9°0° at night
- 108 mm · 8 d
Low season, lower prices
December
Not recommended4°-5° at night
- 114 mm · 10 d
Quiet, then the holidays
Read the twelve months in detail
January. Deep winter: 0 °C at the warmest of the day, -9 °C at night. Expect 9 days of rain in the month (89 mm). Low season: fewer people, lower prices.
February. Deep winter: 2 °C at the warmest of the day, -8 °C at night. Expect 8 days of rain in the month (90 mm). Low season: fewer people, lower prices.
March. Deep winter: 6 °C at the warmest of the day, -3 °C at night. Expect 9 days of rain in the month (104 mm). Low season: fewer people, lower prices.
April. Cool: 12 °C at best, 2 °C at night. Expect 9 days of rain in the month (112 mm). Low season: fewer people, lower prices.
May. Mild, 18 °C in the afternoon and 8 °C early in the morning. Expect 9 days of rain in the month (93 mm). Low season: fewer people, lower prices.
June. Mild, 23 °C in the afternoon and 13 °C early in the morning. Expect 9 days of rain in the month (105 mm). Busy season, without the crush.
July. 26 °C in the afternoon and 16 °C at night. Expect 8 days of rain in the month (87 mm). High season: book early.
August. 26 °C in the afternoon and 15 °C at night. Rain stays light: 91 mm over 7 days. High season: book early.
September. Mild, 22 °C in the afternoon and 11 °C early in the morning. Rain stays light: 96 mm over 7 days. Busy season, without the crush.
October. Cool: 15 °C at best, 5 °C at night. Expect 8 days of rain in the month (133 mm). Busy season, without the crush.
November. Cool: 9 °C at best, 0 °C at night. Expect 8 days of rain in the month (108 mm). Low season: fewer people, lower prices.
December. Deep winter: 4 °C at the warmest of the day, -5 °C at night. Expect 10 days of rain in the month (114 mm). Quiet at the start of the month, then busier as the holidays approach.
Same season, other ideas
Their best time overlaps with this one: worth comparing before you book.
Frequently asked questions
When is the best time to visit Portland, Maine?
June to October: over these months, average highs range from 15 to 26 °C, with 8 days of rain a month on average (2015-2024 averages, Portland Jetport (Maine)).
Which month should you avoid in Portland, Maine?
December: it is the wettest of the months to avoid, with 114 mm over 10 days of rain on average over 2015-2024 at the reference point (Portland Jetport (Maine)).
What is the hottest month in Portland, Maine?
July, with 26 °C on average in the afternoon and 16 °C at night. 2015-2024 averages (Portland Jetport (Maine)).
What is the coldest month in Portland, Maine?
January, with 0 °C at best during the day and -9 °C at night. 2015-2024 averages (Portland Jetport (Maine)).
What is the driest month in Portland, Maine?
July: 87 mm over 8 days of rain, against 133 mm in October, the wettest month.
Plan this trip
📒 The free printable Portland, Maine guide: itinerary, map, where to sleep→
🧭 When to visit the American West: the country overview→
🗓️ Best time to visit: all our destinations→
Compare with other destinations
Photos: Travis Kerkvliet / Pexels · NewTestLeper79 / CC BY-SA 4.0 (Wikimedia Commons) · Bd2media / CC BY-SA 4.0 (Wikimedia Commons)