Maine has an average annual temperature of
46.9°F
(across all 1 city) with approximately
1252 mm of annual precipitation
and average humidity of 84%.
The warmest city is Portland
with average July highs of 74.8°F,
while Portland
is the coldest with average January lows of 8.4°F.
This page covers 45 years of NASA POWER climate data (1981–2025)
including temperature, rainfall, humidity, wind speed, and solar radiation.
Aug is typically the warmest month across Maine with average highs around
75.2°F, while
Jan is the coldest with average lows near
8.4°F.
Dec is the wettest month with approximately
124 mm of rainfall on average.
Month
Max Temp
Min Temp
Avg Temp
Rain (mm)
Humidity
Wind (m/s)
Solar (kWh/m²)
Jan
46.8°F
8.4°F
27.7°F
105
86%
5.2
1.60
Feb
44.4°F
10.9°F
27.7°F
92
84%
5.1
2.50
Mar
48.6°F
16°F
32.2°F
115
82%
4.6
3.70
Apr
55.8°F
30.6°F
43.2°F
117
84%
3.6
4.60
May
64.6°F
39.9°F
52.3°F
99
86%
2.9
5.30
Jun
70.5°F
48.6°F
59.5°F
105
87%
2.6
5.70
Jul
74.8°F
56.8°F
65.8°F
93
87%
2.4
5.80
Aug
75.2°F
56.7°F
66°F
87
85%
2.5
5.20
Sep
71.8°F
49.3°F
60.6°F
93
83%
3.0
4.20
Oct
64.2°F
39.2°F
51.8°F
124
80%
3.9
2.80
Nov
57.2°F
28.6°F
43°F
123
80%
4.6
1.80
Dec
51.1°F
15.3°F
33.1°F
124
83%
4.9
1.40
📈 Maine Yearly Climate Trends
🌡️ Annual Temperature Trend
State-wide avg annual high & low · Last 10 years
📈 Maine Long-Term Climate Trends (1981–2025)
This chart shows how Maine's average temperatures have shifted across 45 years.
Use the range buttons to focus on recent decades or view the full historical record.
Data is averaged across all 1 city in the state.
🌧️ Annual Precipitation Trend
State-wide avg annual precipitation · Last 10 years · mm/year
🔗 Explore Cities in Maine
Browse detailed weather history, monthly averages, and 45-year climate trends for every city in Maine.
Portland is the wettest city in Maine with approximately 1252 mm of annual precipitation on average. View Portland weather history →
What is the warmest month in Maine?▼
Aug is the warmest month across Maine, with state-wide average highs of 75.2°F and average lows of 56.7°F.
How many cities in Maine have weather data?▼
TownPillar has historical weather data for 1 city in Maine, covering 45 years of NASA POWER climate records from 1981 to 2025.
Which month has the most sunshine in Maine?▼
Jul is the sunniest month across Maine with an average solar radiation of 5.80 kWh/m²/day state-wide. This solar radiation data from NASA POWER is useful for solar energy planning, agriculture, and understanding seasonal sunshine availability.
Where does this climate data come from?▼
All data is sourced from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis data. It includes monthly temperature, precipitation, humidity, wind speed, and solar radiation at 0.5° × 0.625° spatial resolution.
📚 Data Source
All weather data is sourced from NASA POWER (Prediction of Worldwide Energy Resources). Data covers 45 years (1981–2025) across 1 city in Maine at monthly temporal resolution.