September is close to Agat's year-round average, with average highs near 28.6°C and lows around 27.9°C (mean 28.3°C). It is a relatively wet time of year, averaging 252 mm of rainfall and 82% relative humidity across the period.
September is close to Agat's year-round average. Across 45 years of records, the warmest September in Agat was 2020 — when the month averaged 29°C — while the coldest was 1982 at 27.5°C. Typical September days reach 28.6°C with nights near 27.9°C. The long-term trend is warming, about 0.2°C per decade.
September is a relatively wet time of year in Agat, averaging 252 mm of rainfall. The wettest September on record was 1982 with 540 mm, while the driest was 1997 at 75 mm.
Relative humidity in Agat during September averages 82%. The most humid September was 2005 at 85%, and the least humid was 1984 at 78%.
September receives about 5.1 kWh/m²/day of solar energy in Agat. The sunniest September was 1997 at 6.2 kWh/m²/day, and the cloudiest were 1994 and 2008 at 4.5.
Average wind speed in Agat during September is 4.1 m/s. The windiest September was 1994 at 5.4 m/s, while the calmest was 2022 at 2.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 28.0°C | 28.0°C | 28.2°C | 28.5°C | 28.7°C | +0.7°C |
| Avg High | 28.4°C | 28.4°C | 28.6°C | 28.9°C | 29.1°C | +0.7°C |
| Avg Low | 27.6°C | 27.6°C | 27.9°C | 28.0°C | 28.3°C | +0.7°C |
| Avg Rain | 231 mm | 218 mm | 241 mm | 321 mm | 247 mm | +16 mm |
September temperatures in Agat have risen by about 0.6°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 25.8°C (1995) to a record high of 30.3°C (2020).
Rainfall in September is a relatively wet time of year, averaging 252 mm, with a wettest year of 540 mm.
A quieter season to visit Agat
If your dates are flexible, the more temperate months of March and February tend to be the most comfortable for visiting Agat. That said, September — with days averaging 28.6°C and nights around 27.9°C (mean 28.3°C) and higher rainfall (252 mm) — can still be rewarding for travellers who don't mind the warmth, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 28.7°C | 28.3°C | 27.8°C | 29.7°C | 26.8°C | 282 mm | 82% | 3.3 m/s | 4.9 |
| 2024 | 29.4°C | 28.9°C | 28.5°C | 30.1°C | 27.5°C | 364 mm | 82% | 4 m/s | 4.9 |
| 2023 | 29.2°C | 28.8°C | 28.4°C | 29.9°C | 27.5°C | 201 mm | 83% | 3.6 m/s | 5.3 |
| 2022 | 29.1°C | 28.6°C | 28.1°C | 30.2°C | 26.6°C | 177 mm | 79% | 2.6 m/s | 5.5 |
| 2021 | 29.0°C | 28.6°C | 28.3°C | 29.6°C | 27.6°C | 251 mm | 80% | 3.1 m/s | 5.3 |
| 2020 🔥 | 29.5°C | 29.0°C | 28.5°C | 30.3°C | 26.7°C | 205 mm | 78% | 2.7 m/s | 5.4 |
| 2019 | 28.9°C | 28.5°C | 28.0°C | 29.6°C | 26.6°C | 330 mm | 82% | 3.8 m/s | 4.7 |
| 2018 | 28.5°C | 28.1°C | 27.7°C | 29.3°C | 26.4°C | 332 mm | 82% | 4.3 m/s | 4.9 |
| 2017 | 29.2°C | 28.6°C | 28.1°C | 30.0°C | 26.9°C | 230 mm | 80% | 3.3 m/s | 5.2 |
| 2016 | 28.9°C | 28.5°C | 28.1°C | 29.8°C | 27.3°C | 327 mm | 82% | 3.7 m/s | 4.8 |
| 2015 | 28.8°C | 28.4°C | 28.0°C | 29.5°C | 27.2°C | 180 mm | 83% | 3.9 m/s | 5.4 |
| 2014 | 29.0°C | 28.5°C | 28.1°C | 29.9°C | 26.9°C | 346 mm | 82% | 4 m/s | 4.6 |
| 2013 | 29.3°C | 28.9°C | 28.4°C | 30.2°C | 27.5°C | 484 mm | 81% | 4.4 m/s | 4.8 |
| 2012 | 29.0°C | 28.5°C | 28.0°C | 29.8°C | 27.3°C | 346 mm | 81% | 3.5 m/s | 5.2 |
| 2011 | 28.6°C | 28.2°C | 27.8°C | 29.3°C | 27.3°C | 373 mm | 82% | 4.5 m/s | 4.7 |
| 2010 | 28.8°C | 28.4°C | 28.1°C | 29.4°C | 27.3°C | 261 mm | 81% | 4.5 m/s | 5.3 |
| 2009 | 29.0°C | 28.7°C | 28.3°C | 29.8°C | 26.5°C | 274 mm | 84% | 5.3 m/s | 4.6 |
| 2008 | 28.6°C | 28.2°C | 27.8°C | 29.4°C | 27.0°C | 277 mm | 82% | 4 m/s | 4.5 |
| 2007 | 28.5°C | 28.1°C | 27.7°C | 29.3°C | 27.0°C | 320 mm | 83% | 3.7 m/s | 4.8 |
| 2006 | 28.9°C | 28.6°C | 28.3°C | 29.6°C | 27.5°C | 160 mm | 81% | 3.1 m/s | 5.5 |
| 2005 | 28.5°C | 28.1°C | 27.8°C | 29.3°C | 27.1°C | 264 mm | 85% | 4.7 m/s | 4.9 |
| 2004 | 28.1°C | 27.8°C | 27.4°C | 29.7°C | 26.4°C | 174 mm | 83% | 3.6 m/s | 5.7 |
| 2003 | 28.9°C | 28.4°C | 28.0°C | 29.8°C | 26.6°C | 348 mm | 83% | 4 m/s | 4.6 |
| 2002 | 28.8°C | 28.5°C | 28.2°C | 29.7°C | 27.3°C | 209 mm | 82% | 4.3 m/s | 5.5 |
| 2001 | 28.1°C | 27.8°C | 27.4°C | 29.3°C | 26.4°C | 160 mm | 83% | 2.8 m/s | 5.7 |
| 2000 | 28.4°C | 28.1°C | 27.7°C | 29.6°C | 26.6°C | 220 mm | 81% | 4.3 m/s | 5.1 |
| 1999 | 28.4°C | 28.0°C | 27.5°C | 29.5°C | 26.5°C | 292 mm | 81% | 3.9 m/s | 5.1 |
| 1998 | 28.8°C | 28.4°C | 28.0°C | 29.5°C | 27.0°C | 303 mm | 83% | 4.6 m/s | 5 |
| 1997 | 28.6°C | 28.3°C | 28.0°C | 29.5°C | 27.0°C | 75 mm | 81% | 3.7 m/s | 6.2 |
| 1996 | 28.6°C | 28.2°C | 27.8°C | 29.8°C | 26.8°C | 270 mm | 84% | 4.7 m/s | 4.8 |
| 1995 | 28.6°C | 28.2°C | 27.8°C | 29.6°C | 25.8°C | 247 mm | 83% | 4.4 m/s | 4.9 |
| 1994 | 28.5°C | 28.2°C | 27.9°C | 29.8°C | 26.3°C | 263 mm | 83% | 5.4 m/s | 4.5 |
| 1993 | 28.0°C | 27.6°C | 27.2°C | 28.8°C | 26.0°C | 153 mm | 84% | 4.2 m/s | 5 |
| 1992 | 27.9°C | 27.6°C | 27.3°C | 28.8°C | 26.1°C | 114 mm | 84% | 5.1 m/s | 5.3 |
| 1991 | 28.1°C | 27.8°C | 27.4°C | 29.1°C | 26.4°C | 241 mm | 84% | 4.5 m/s | 4.6 |
| 1990 | 28.2°C | 27.9°C | 27.5°C | 29.0°C | 26.7°C | 220 mm | 83% | 4.7 m/s | 4.7 |
| 1989 | 28.1°C | 27.7°C | 27.3°C | 28.8°C | 26.2°C | 170 mm | 82% | 4.2 m/s | 5.3 |
| 1988 | 28.6°C | 28.2°C | 27.8°C | 29.9°C | 26.6°C | 106 mm | 80% | 3.8 m/s | 5.3 |
| 1987 | 28.5°C | 28.1°C | 27.8°C | 29.1°C | 26.3°C | 135 mm | 82% | 5 m/s | 5.4 |
| 1986 | 28.2°C | 27.8°C | 27.4°C | 29.0°C | 26.2°C | 151 mm | 83% | 4.6 m/s | 5.4 |
| 1985 | 28.2°C | 27.8°C | 27.3°C | 29.1°C | 26.2°C | 307 mm | 82% | 4.3 m/s | 5.2 |
| 1984 | 28.4°C | 28.1°C | 27.8°C | 29.4°C | 27.1°C | 231 mm | 78% | 3.1 m/s | 5.7 |
| 1983 | 28.9°C | 28.4°C | 28.0°C | 29.6°C | 26.5°C | 255 mm | 80% | 4.3 m/s | — |
| 1982 ❄️ 🌧️ | 27.9°C | 27.5°C | 27.1°C | 28.7°C | 26.5°C | 540 mm | 83% | 4.6 m/s | — |
| 1981 | 28.6°C | 28.2°C | 27.9°C | 29.5°C | 26.8°C | 185 mm | 80% | 4.5 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 28.6°C with lows near 27.9°C (mean 28.3°C), based on 45 years of NASA POWER data.
September averages 252 mm of rainfall in Agat, a relatively wet time of year. The wettest on record was 540 mm in 1982.
The hottest September reached 30.3°C in 2020. The coldest dipped to 25.8°C in 1995.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 0.6°C. Daytime highs moved from 28.4°C to 29.1°C and overnight lows from 27.6°C to 28.2°C over the same span.
September is close to Agat's year-round average and a relatively wet time of year, so plan for around 28.6°C daytime highs and 27.9°C at night.
Not quite — September is the 7th coolest month in Agat, averaging 28.3°C.
For September in Agat, pack light layers you can adjust through the day, with typical highs of 28.6°C and lows of 27.9°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 82% — quite humid.
Average wind speed in September is 4.1 m/s. The windiest September on record averaged 5.4 m/s (1994).
The wettest September on record was 1982 with 540 mm. On average, September sees 252 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 Agat 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.
