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Pago Pago, American Samoa climate
Af Tropical rainforest
Pago Pago has a remarkably steady tropical climate (Tropical rainforest, Köppen Af). The hottest month is March with an average daily high near 88°F, while the coldest is August averaging around 77°F at night. Around 129 inches of precipitation falls each year, peaking in January (15.6 inches) and easing off in June (6.5 inches).
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresHours of sunshine per day
Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)Pago Pago climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 88 | 88 | 88 | 88 | 86 | 85 | 85 | 85 | 86 | 86 | 87 | 88 |
| Avg temp (°F) | 83 | 83 | 83 | 83 | 82 | 82 | 81 | 81 | 82 | 82 | 83 | 83 |
| Avg low (°F) | 78 | 78 | 78 | 78 | 78 | 78 | 77 | 77 | 77 | 78 | 78 | 78 |
| Precipitation (in) | 15.6 | 13.6 | 10.8 | 11.4 | 11.9 | 6.5 | 7.3 | 6.9 | 7.8 | 10.3 | 12.4 | 14.7 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 88 | 88 | 88 | 88 | 86 | 85 |
| Avg temp (°F) | 83 | 83 | 83 | 83 | 82 | 82 |
| Avg low (°F) | 78 | 78 | 78 | 78 | 78 | 78 |
| Precipitation (in) | 15.6 | 13.6 | 10.8 | 11.4 | 11.9 | 6.5 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 85 | 85 | 86 | 86 | 87 | 88 |
| Avg temp (°F) | 81 | 81 | 82 | 82 | 83 | 83 |
| Avg low (°F) | 77 | 77 | 77 | 78 | 78 | 78 |
| Precipitation (in) | 7.3 | 6.9 | 7.8 | 10.3 | 12.4 | 14.7 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 24 | 22 | 24 | 22 | 21 | 19 | 20 | 19 | 18 | 21 | 21 | 24 |
| Days with high ≥ 90°F (days) | 7 | 8 | 9 | 5 | 2 | 0.2 | 0.3 | 0.2 | 0.7 | 2 | 3 | 5 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 24 | 22 | 24 | 22 | 21 | 19 |
| Days with high ≥ 90°F (days) | 7 | 8 | 9 | 5 | 2 | 0.2 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 20 | 19 | 18 | 21 | 21 | 24 |
| Days with high ≥ 90°F (days) | 0.3 | 0.2 | 0.7 | 2 | 3 | 5 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 77 | 74 | 70 | 63 | 61 | 59 | 57 | 55 | 56 | 63 | 69 | 73 |
| Relative humidity (%) | 81 | 81 | 81 | 80 | 80 | 79 | 80 | 79 | 80 | 81 | 81 | 81 |
| Wind speed (mph) | 9.8 | 10.0 | 9.0 | 9.5 | 10.9 | 13.0 | 13.0 | 12.7 | 13.0 | 11.8 | 10.4 | 10.1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 77 | 74 | 70 | 63 | 61 | 59 |
| Relative humidity (%) | 81 | 81 | 81 | 80 | 80 | 79 |
| Wind speed (mph) | 9.8 | 10.0 | 9.0 | 9.5 | 10.9 | 13.0 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 57 | 55 | 56 | 63 | 69 | 73 |
| Relative humidity (%) | 80 | 79 | 80 | 81 | 81 | 81 |
| Wind speed (mph) | 13.0 | 12.7 | 13.0 | 11.8 | 10.4 | 10.1 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 30 years of daily observations at Pago Pago Wso AP, a weather station, about 6 km from the city centre. The underlying daily records come from NOAA's global station network.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.