Maine has a temperate climate with warm summers and cold winters.
Maine has an average annual temperature of 47.1°F across all 1 city, with approximately 1269 mm of annual precipitation and average humidity of 84%. Temperatures peak in August and drop to their lowest in January, while rainfall is highest during winter months.
The warmest city is Portland with average July highs of 68.5°F, while Portland is the coldest with average January lows of 24.1°F. Humidity remains high throughout the year creating cold and damp conditions. These seasonal patterns make summer pleasant for travel, while winters can bring frost and occasional snowfall.
| Month | 🌤️ | Avg High | Avg Temp | Avg Low | Record High | Record Low | Humid % | Rain (mm) | Wind (m/s) | Solar (kWh/m²) |
|---|---|---|---|---|---|---|---|---|---|---|
| January | ⛅ | 33.4°F | 28.8°F | 24.1°F | 54.3°F | -4.4°F | 86% | 104 | 5.2 | 1.60 |
| February | ⛅ | 34.2°F | 29.7°F | 25.0°F | 52.3°F | -5.4°F | 84% | 92 | 5.1 | 2.50 |
| March | ⛅ | 38.5°F | 34.3°F | 30.4°F | 61.2°F | 4.3°F | 82% | 114 | 4.6 | 3.70 |
| April | ⛅ | 45.7°F | 41.9°F | 38.1°F | 65.5°F | 18.0°F | 84% | 116 | 3.6 | 4.60 |
| May | ⛅ | 53.6°F | 50.0°F | 46.4°F | 73.8°F | 35.4°F | 86% | 98 | 2.9 | 5.30 |
| June | ⛅ | 62.2°F | 58.8°F | 55.4°F | 78.6°F | 44.6°F | 87% | 104 | 2.6 | 5.70 |
| July | ⛅ | 68.5°F | 65.3°F | 62.1°F | 79.5°F | 50.7°F | 87% | 93 | 2.4 | 5.80 |
| August | ⛅ | 69.3°F | 65.8°F | 62.4°F | 79.5°F | 48.7°F | 85% | 86 | 2.5 | 5.20 |
| September | ⛅ | 64.2°F | 60.6°F | 57.0°F | 78.1°F | 40.6°F | 83% | 94 | 3.0 | 4.20 |
| October | ⛅ | 55.6°F | 52.0°F | 48.4°F | 69.6°F | 33.6°F | 80% | 124 | 3.9 | 2.80 |
| November | ⛅ | 46.9°F | 43.2°F | 39.6°F | 63.7°F | 15.4°F | 80% | 122 | 4.6 | 1.80 |
| December | ⛅ | 38.8°F | 34.5°F | 30.4°F | 58.1°F | 2.1°F | 83% | 124 | 4.9 | 1.40 |
Showing average climate conditions across 45 years (1981–2025) · averaged across all 1 cities in Maine
🧥 Expect frosty nights and below-freezing temperatures during this Cold Winter period.
🌤️ Conditions are ideal for outdoor activities throughout the day in this Mild Summer.
☔ Moderate Rainfall expected — carry rain gear and plan outdoor activities around these months.
Region-wide monthly averages across 1 city · 1981–2025 · °F
Temperatures rise steadily from spring, peak in August, and gradually decline through autumn into winter.
These seasonal patterns make summer pleasant for travel, while winters can bring frost and occasional snowfall.
Region-wide monthly rainfall · 1981–2025 · mm/month
💧 Humidity peaks at 87% in June · annual avg 84%
Monthly averages · 1981–2025
Across 45 years, Maine's temperature has remained relatively stable over the past decade. 2012 was the warmest year overall and 1992 the coolest.
The warmest year on record was 2012 (avg: 49.8°F), while the coldest year was 1992 (avg: 44.8°F).
Averaged across all 1 cities in Maine · Last 30 years · °F
Averaged across all 1 cities in Maine · Last 30 years · mm/year
🔥 hottest · ❄️ coldest · 🌧️ wettest
ℹ️ Values are averages across all 1 cities in Maine for each year.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall (mm) | Avg Humidity | Avg Wind |
|---|---|---|---|---|---|---|---|---|
2025 | 51.8°F | 48.0°F | 44.1°F | 78.6°F | 14.5°F | 868 | 82% | 4.0 m/s |
2024 | 52.9°F | 49.5°F | 46.0°F | 77.2°F | 16.3°F | 1224 | 84% | 3.7 m/s |
2023 | 53.1°F | 49.6°F | 46.2°F | 76.8°F | -5.4°F | 1534 | 85% | 3.7 m/s |
2022 | 53.1°F | 49.1°F | 45.1°F | 79.3°F | 7.9°F | 1184 | 83% | 3.9 m/s |
2021 | 53.2°F | 49.6°F | 46.0°F | 78.8°F | 12.2°F | 1167 | 82% | 3.7 m/s |
2020 | 53.1°F | 49.3°F | 45.5°F | 79.2°F | 11.5°F | 1215 | 83% | 3.9 m/s |
2019 | 50.7°F | 47.1°F | 43.3°F | 77.4°F | 7.5°F | 1677 | 84% | 3.8 m/s |
2018 | 51.4°F | 47.8°F | 44.2°F | 77.7°F | 4.5°F | 1662 | 84% | 3.9 m/s |
2017 | 51.6°F | 48.0°F | 44.4°F | 73.0°F | 5.7°F | 1496 | 84% | 3.8 m/s |
2016 | 52.9°F | 48.9°F | 45.0°F | 78.4°F | 1.6°F | 1317 | 82% | 3.8 m/s |
Showing 1 to 10 of 45 years
All weather data is sourced from NASA POWER (Prediction of Worldwide Energy Resources), a NASA project providing solar and meteorological data for renewable energy, building efficiency, and agricultural research.
