Portland, Maine Climate by Month
Portland, Maine, United States
Warm summers and freezing winters, with rain spread through the year.
Portland has warm summers and freezing winters, with rain spread through the year. Expect highs of 80°F (27°C) in July and 32°F (0°C) in January, with the coldest nights (January) near 14°F (-10°C). About 47 in (1187 mm) of rain falls in a typical year, with no clear rainy season.
- Warmest month
- 80°F(27°C)
- Average high, July
- Coldest nights
- 14°F(-10°C)
- Average low, January
- Rain per year
- 47 in(1187 mm)
- No clear rainy season
- Humidity
- 69%
- Sunniest: July
Best and worst months in Portland
Best for weatherJune is the best time for weather in Portland: highs near 75°F (24°C) and about 3.6 in (92 mm) of rain a month.
Least pleasantJanuary is the least pleasant month: it's the coldest, with highs of only 32°F (0°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in June.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Portland weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 32°F(0°C) | 14°F(-10°C) | 3.6 in(91 mm) | 70% | 1.6 |
| FebFebruary | 36°F(2°C) | 16°F(-9°C) | 3.3 in(85 mm) | 63% | 2.5 |
| MarMarch | 43°F(6°C) | 25°F(-4°C) | 4.3 in(108 mm) | 60% | 3.5 |
| AprApril | 55°F(13°C) | 35°F(2°C) | 4.6 in(116 mm) | 60% | 4.6 |
| MayMay | 66°F(19°C) | 45°F(7°C) | 3.7 in(95 mm) | 67% | 5.2 |
| JunJuneBest | 75°F(24°C) | 54°F(12°C) | 3.6 in(92 mm) | 68% | 5.6 |
| JulJuly | 80°F(27°C) | 60°F(16°C) | 3.1 in(80 mm) | 71% | 5.7 |
| AugAugust | 79°F(26°C) | 59°F(15°C) | 3.1 in(79 mm) | 74% | 5.2 |
| SepSeptember | 72°F(22°C) | 51°F(11°C) | 3.3 in(84 mm) | 75% | 4.0 |
| OctOctober | 60°F(16°C) | 40°F(5°C) | 5.2 in(132 mm) | 72% | 2.5 |
| NovNovember | 48°F(9°C) | 31°F(0°C) | 4.2 in(107 mm) | 72% | 1.6 |
| DecDecember | 38°F(3°C) | 22°F(-6°C) | 4.6 in(118 mm) | 71% | 1.3 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
Places with a similar climate outside the United States
- 🇨🇦KingstonOntario, Canada · Pop. 132k93%matchDrier wintersMore humidPortland vs Kingston →
- 🇨🇦BellevilleOntario, Canada · Pop. 51k93%matchDrier wintersMore humidPortland vs Belleville →
- 🇯🇵SapporoHokkaido, Japan · Pop. 2.0M93%matchLess sunMilder wintersPortland vs Sapporo →
- 🇯🇵RumoiHokkaido, Japan · Pop. 26k87%matchCooler summersLess sunPortland vs Rumoi →
- 🇨🇦WindsorOntario, Canada · Pop. 230k85%matchMilder wintersDrier wintersPortland vs Windsor →
- 🇺🇸Derry VillageNew Hampshire, United States · Pop. 35k99%matchClose on every measurePortland vs Derry Village →
- 🇺🇸West TorringtonConnecticut, United States · Pop. 36k99%matchWetter summersPortland vs West Torrington →
- 🇺🇸WorcesterMassachusetts, United States · Pop. 207k99%matchHotter summersWetter summersPortland vs Worcester →
- 🇺🇸UticaNew York, United States · Pop. 61k99%matchDrier wintersHotter summersPortland vs Utica →
- 🇺🇸East ConcordNew Hampshire, United States · Pop. 43k99%matchDrier wintersHotter summersPortland vs East Concord →