American Samoa has an average annual temperature of
81.5°F
(across all 1 city) with approximately
1982 mm of annual precipitation
and average humidity of 81%.
The warmest city is Pago Pago
with average July highs of 82.6°F,
while Pago Pago
is the coldest with average January lows of 79.5°F.
This page covers 45 years of NASA POWER climate data (1981–2025)
including temperature, rainfall, humidity, wind speed, and solar radiation.
Apr is typically the warmest month across American Samoa with average highs around
84.6°F, while
Aug is the coldest with average lows near
77.7°F.
Jan is the wettest month with approximately
285 mm of rainfall on average.
Month
Max Temp
Min Temp
Avg Temp
Rain (mm)
Humidity
Wind (m/s)
Solar (kWh/m²)
Jan
84.4°F
79.5°F
82°F
285
82%
4.3
5.90
Feb
84.4°F
79.9°F
82.2°F
252
81%
4.5
5.90
Mar
84.6°F
80.1°F
82.4°F
198
81%
4.0
5.70
Apr
84.6°F
80.2°F
82.4°F
177
81%
4.2
5.10
May
84.2°F
79.9°F
82°F
149
80%
4.8
4.50
Jun
83.5°F
79.2°F
81.3°F
87
80%
5.6
4.20
Jul
82.6°F
77.9°F
80.2°F
78
80%
5.8
4.40
Aug
82.4°F
77.7°F
80.1°F
71
79%
5.7
5.10
Sep
82.6°F
78.1°F
80.4°F
90
80%
5.7
5.70
Oct
83.1°F
78.6°F
81°F
158
81%
5.2
6.00
Nov
83.7°F
79.2°F
81.5°F
216
81%
4.6
6.10
Dec
84.2°F
79.2°F
81.7°F
242
81%
4.4
6.00
📈 American Samoa Yearly Climate Trends
🌡️ Annual Temperature Trend
State-wide avg annual high & low · Last 10 years
📈 American Samoa Long-Term Climate Trends (1981–2025)
This chart shows how American Samoa'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 American Samoa
Browse detailed weather history, monthly averages, and 45-year climate trends for every city in American Samoa.
Pago Pago is the wettest city in American Samoa with approximately 1982 mm of annual precipitation on average. View Pago Pago weather history →
What is the warmest month in American Samoa?▼
Apr is the warmest month across American Samoa, with state-wide average highs of 84.6°F and average lows of 80.2°F.
How many cities in American Samoa have weather data?▼
TownPillar has historical weather data for 1 city in American Samoa, covering 45 years of NASA POWER climate records from 1981 to 2025.
Which month has the most sunshine in American Samoa?▼
Nov is the sunniest month across American Samoa with an average solar radiation of 6.10 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 American Samoa at monthly temporal resolution.