September is close to Pago Pago's year-round average, with average highs near 27.3°C and lows around 26.6°C (mean 27°C). It is one of the drier months, averaging 91 mm of rainfall and 80% relative humidity across the period.
September is close to Pago Pago's year-round average. Across 45 years of records, the warmest Septembers in Pago Pago were 2005 and 2016 — when the month averaged 27.7°C — while the coldest was 1987 at 25.6°C. Typical September days reach 27.3°C with nights near 26.6°C. The long-term trend is warming, about 0.3°C per decade.
September is one of the drier months in Pago Pago, averaging 91 mm of rainfall. The wettest September on record was 1999 with 222 mm, while the driest was 2011 at 4 mm.
Relative humidity in Pago Pago during September averages 80%. The most humid September was 1986 at 84%, and the least humid was 2011 at 76%.
September receives about 5.7 kWh/m²/day of solar energy in Pago Pago. The sunniest Septembers were 2011 and 2021 at 6.6 kWh/m²/day, and the cloudiest were 1993 and 2006 at 5.2.
Average wind speed in Pago Pago during September is 5.7 m/s. The windiest September was 1998 at 7.1 m/s, while the calmest was 2016 at 3.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 26.3°C | 26.9°C | 27.2°C | 27.3°C | 27.3°C | +1°C |
| Avg High | 26.7°C | 27.2°C | 27.5°C | 27.7°C | 27.6°C | +0.9°C |
| Avg Low | 26.0°C | 26.5°C | 26.8°C | 26.9°C | 27.0°C | +1°C |
| Avg Rain | 95 mm | 111 mm | 106 mm | 66 mm | 66 mm | -29 mm |
September temperatures in Pago Pago have risen by about 0.8°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 24°C (1987) to a record high of 29°C (2016).
Rainfall in September is one of the drier months, averaging 91 mm, with a wettest year of 222 mm.
One of the best times to visit Pago Pago
September is one of the best times to visit Pago Pago. Expect days averaging 27.3°C and nights around 26.6°C (mean 27°C) — close to Pago Pago's yearly average — with higher rainfall (91 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 27.4°C | 27.0°C | 26.6°C | 28.3°C | 25.3°C | 67 mm | 80% | 5.5 m/s | 5.9 |
| 2024 | 27.7°C | 27.4°C | 27.1°C | 28.3°C | 25.9°C | 115 mm | 82% | 5.1 m/s | 5.7 |
| 2023 | 27.8°C | 27.5°C | 27.1°C | 28.5°C | 26.5°C | 48 mm | 80% | 6.2 m/s | 5.9 |
| 2022 | 27.3°C | 27.0°C | 26.7°C | 28.3°C | 25.7°C | 33 mm | 79% | 6 m/s | 6.3 |
| 2021 | 27.7°C | 27.3°C | 26.9°C | 28.2°C | 26.0°C | 15 mm | 79% | 5.4 m/s | 6.6 |
| 2020 | 27.9°C | 27.6°C | 27.3°C | 28.6°C | 26.4°C | 119 mm | 81% | 5.5 m/s | 5.6 |
| 2019 | 27.7°C | 27.4°C | 27.0°C | 28.6°C | 26.0°C | 101 mm | 80% | 5.6 m/s | 5.9 |
| 2018 | 27.9°C | 27.5°C | 27.2°C | 28.3°C | 26.1°C | 62 mm | 78% | 5.9 m/s | 6 |
| 2017 | 27.8°C | 27.4°C | 27.1°C | 28.5°C | 25.8°C | 46 mm | 80% | 5.5 m/s | 6 |
| 2016 | 28.0°C | 27.7°C | 27.3°C | 29.0°C | 26.5°C | 77 mm | 80% | 3.9 m/s | 5.8 |
| 2015 | 26.9°C | 26.4°C | 26.0°C | 28.2°C | 24.6°C | 43 mm | 80% | 5.2 m/s | 5.9 |
| 2014 | 27.6°C | 27.3°C | 26.9°C | 28.6°C | 26.0°C | 40 mm | 81% | 5.9 m/s | 6 |
| 2013 | 27.8°C | 27.5°C | 27.2°C | 28.4°C | 26.2°C | 103 mm | 79% | 6 m/s | 5.6 |
| 2012 | 27.9°C | 27.5°C | 27.2°C | 28.6°C | 26.3°C | 54 mm | 80% | 5.4 m/s | 6 |
| 2011 | 27.1°C | 26.7°C | 26.2°C | 27.8°C | 25.4°C | 4 mm | 76% | 4.7 m/s | 6.6 |
| 2010 | 27.8°C | 27.5°C | 27.1°C | 28.3°C | 26.3°C | 132 mm | 79% | 6.9 m/s | 5.4 |
| 2009 | 27.1°C | 26.8°C | 26.4°C | 28.0°C | 25.4°C | 76 mm | 79% | 6.2 m/s | 5.8 |
| 2008 | 27.3°C | 27.0°C | 26.6°C | 27.7°C | 25.5°C | 94 mm | 81% | 5.8 m/s | 5.9 |
| 2007 | 27.9°C | 27.6°C | 27.2°C | 28.6°C | 26.5°C | 89 mm | 80% | 5.5 m/s | 5.8 |
| 2006 | 27.7°C | 27.4°C | 27.0°C | 28.3°C | 26.1°C | 147 mm | 81% | 6 m/s | 5.2 |
| 2005 🔥 | 28.0°C | 27.7°C | 27.4°C | 28.4°C | 26.6°C | 186 mm | 81% | 6.3 m/s | 5.4 |
| 2004 | 27.8°C | 27.4°C | 27.1°C | 28.6°C | 25.6°C | 66 mm | 77% | 5.6 m/s | 5.9 |
| 2003 | 27.7°C | 27.3°C | 27.0°C | 28.8°C | 25.2°C | 165 mm | 78% | 6 m/s | 5.9 |
| 2002 | 27.2°C | 26.9°C | 26.6°C | 28.0°C | 25.7°C | 82 mm | 80% | 6.4 m/s | 5.8 |
| 2001 | 27.0°C | 26.7°C | 26.4°C | 27.9°C | 25.2°C | 121 mm | 81% | 6.5 m/s | 5.3 |
| 2000 | 27.3°C | 26.9°C | 26.6°C | 27.8°C | 26.0°C | 32 mm | 79% | 5.3 m/s | 5.9 |
| 1999 🌧️ | 27.4°C | 27.1°C | 26.8°C | 28.3°C | 25.8°C | 222 mm | 80% | 6 m/s | 5.5 |
| 1998 | 26.9°C | 26.7°C | 26.4°C | 27.6°C | 25.8°C | 86 mm | 82% | 7.1 m/s | 5.3 |
| 1997 | 27.1°C | 26.7°C | 26.4°C | 28.1°C | 25.1°C | 92 mm | 79% | 5.6 m/s | 5.8 |
| 1996 | 27.1°C | 26.7°C | 26.4°C | 27.7°C | 25.6°C | 116 mm | 79% | 6.2 m/s | 5.5 |
| 1995 | 27.4°C | 27.1°C | 26.7°C | 28.5°C | 25.7°C | 97 mm | 80% | 6.5 m/s | 5.3 |
| 1994 | 26.8°C | 26.4°C | 26.0°C | 27.5°C | 25.1°C | 89 mm | 81% | 4.7 m/s | 5.4 |
| 1993 | 27.2°C | 26.8°C | 26.4°C | 28.4°C | 25.5°C | 166 mm | 81% | 5.7 m/s | 5.2 |
| 1992 | 27.8°C | 27.4°C | 27.1°C | 28.6°C | 26.2°C | 154 mm | 80% | 5.5 m/s | 5.5 |
| 1991 | 27.1°C | 26.6°C | 26.2°C | 27.8°C | 25.1°C | 55 mm | 79% | 4.7 m/s | 5.5 |
| 1990 | 27.4°C | 27.1°C | 26.7°C | 28.2°C | 25.5°C | 38 mm | 79% | 5.1 m/s | 5.9 |
| 1989 | 27.1°C | 26.7°C | 26.4°C | 27.9°C | 25.2°C | 24 mm | 79% | 6.1 m/s | 6.1 |
| 1988 | 26.9°C | 26.5°C | 26.1°C | 27.5°C | 25.1°C | 101 mm | 81% | 6.2 m/s | 5.5 |
| 1987 ❄️ | 26.0°C | 25.6°C | 25.3°C | 27.2°C | 24.0°C | 58 mm | 80% | 5.4 m/s | 5.6 |
| 1986 | 26.8°C | 26.4°C | 26.1°C | 28.3°C | 24.9°C | 148 mm | 84% | 5.1 m/s | 5.3 |
| 1985 | 26.3°C | 26.0°C | 25.8°C | 27.2°C | 25.1°C | 177 mm | 82% | 5.5 m/s | 5.4 |
| 1984 | 26.8°C | 26.4°C | 26.0°C | 27.7°C | 25.0°C | 100 mm | 82% | 5 m/s | 5.4 |
| 1983 | 26.8°C | 26.5°C | 26.1°C | 27.4°C | 25.5°C | 45 mm | 82% | 6.1 m/s | — |
| 1982 | 26.3°C | 26.0°C | 25.6°C | 27.7°C | 24.5°C | 95 mm | 80% | 5.9 m/s | — |
| 1981 | 27.3°C | 26.9°C | 26.6°C | 28.2°C | 25.8°C | 109 mm | 80% | 4.9 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 27.3°C with lows near 26.6°C (mean 27°C), based on 45 years of NASA POWER data.
September averages 91 mm of rainfall in Pago Pago, one of the drier months. The wettest on record was 222 mm in 1999.
The hottest September reached 29°C in 2016. The coldest dipped to 24°C in 1987.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 0.8°C. Daytime highs moved from 26.7°C to 27.6°C and overnight lows from 26°C to 26.9°C over the same span.
September is close to Pago Pago's year-round average and one of the drier months, so plan for around 27.3°C daytime highs and 26.6°C at night.
Not quite — September is the 3rd coolest month in Pago Pago, averaging 27°C.
For September in Pago Pago, pack light layers you can adjust through the day, with typical highs of 27.3°C and lows of 26.6°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 80% — quite humid.
Average wind speed in September is 5.7 m/s. The windiest September on record averaged 7.1 m/s (1998).
The wettest September on record was 1999 with 222 mm. On average, September sees 91 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in Pago Pago behaves each September, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for September specifically, along with year-by-year records and how the month has changed over the decades.
