September is one of the warmer months of the year in Griffin, with average highs near 30.4°C and lows around 17.4°C (mean 23.9°C). It is one of the drier months, averaging 89 mm of rainfall and 71% relative humidity across the period.
September is one of the warmer months of the year in Griffin. Across 45 years of records, the warmest September in Griffin was 2019 — when the month averaged 27.9°C — while the coldest was 1994 at 21.5°C. Typical September days reach 30.4°C with nights near 17.4°C. The long-term trend is warming, about 0.4°C per decade.
September is one of the drier months in Griffin, averaging 89 mm of rainfall. The wettest September on record was 2004 with 292 mm, while the driest was 1984 at 8 mm.
Relative humidity in Griffin during September averages 71%. The most humid September was 1994 at 83%, and the least humid was 1999 at 58%.
September receives about 4.7 kWh/m²/day of solar energy in Griffin. The sunniest September was 2019 at 5.8 kWh/m²/day, and the cloudiest were 1988 and 2002 at 3.8.
Average wind speed in Griffin during September is 0.1 m/s. The windiest Septembers were 2017, 2019 and 2021, among others at 0.2 m/s, while the calmest were 2023, 2024 and 2025, among others at 0.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 23.2°C | 23.9°C | 23.4°C | 24.9°C | 24.2°C | +1°C |
| Avg High | 29.7°C | 30.6°C | 29.4°C | 31.5°C | 30.6°C | +0.9°C |
| Avg Low | 16.8°C | 17.2°C | 17.4°C | 18.3°C | 17.7°C | +0.9°C |
| Avg Rain | 79 mm | 88 mm | 104 mm | 76 mm | 101 mm | +22 mm |
September temperatures in Griffin have risen by about 1.3°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 6.3°C (1983) to a record high of 38.9°C (2019).
Rainfall in September is one of the drier months, averaging 89 mm, with a wettest year of 292 mm.
One of the best times to visit Griffin
September is one of the best times to visit Griffin. Expect days averaging 30.4°C and nights around 17.4°C (mean 23.9°C) — warmer than Griffin's yearly average — with higher rainfall (89 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 | 32.6°C | 25.2°C | 17.9°C | 35.8°C | 13.7°C | 30 mm | 64% | 0.1 m/s | 5.2 |
| 2024 | 31.2°C | 25.2°C | 19.1°C | 37.4°C | 15.8°C | 235 mm | 72% | 0.1 m/s | 4.2 |
| 2023 | 31.8°C | 24.8°C | 17.8°C | 36.4°C | 12.8°C | 37 mm | 66% | 0.1 m/s | 5 |
| 2022 | 29.8°C | 23.2°C | 16.6°C | 36.1°C | 9.5°C | 58 mm | 71% | 0.1 m/s | 5.2 |
| 2021 | 29.4°C | 23.3°C | 17.2°C | 33.5°C | 9.3°C | 87 mm | 75% | 0.2 m/s | 4.8 |
| 2020 | 28.8°C | 23.2°C | 17.7°C | 35.8°C | 8.6°C | 157 mm | 77% | 0.1 m/s | 4.5 |
| 2019 🔥 | 35.7°C | 27.9°C | 20.1°C | 38.9°C | 14.0°C | 21 mm | 58% | 0.2 m/s | 5.8 |
| 2018 | 33.4°C | 27.1°C | 20.8°C | 36.6°C | 18.9°C | 64 mm | 72% | 0.1 m/s | 4.8 |
| 2017 | 29.6°C | 23.0°C | 16.5°C | 34.3°C | 11.5°C | 110 mm | 71% | 0.2 m/s | 5.3 |
| 2016 | 33.0°C | 26.1°C | 19.1°C | 36.6°C | 10.9°C | 50 mm | 67% | 0.1 m/s | 5.4 |
| 2015 | 28.9°C | 23.2°C | 17.6°C | 36.7°C | 10.3°C | 106 mm | 78% | 0.1 m/s | 4.4 |
| 2014 | 31.3°C | 25.1°C | 18.9°C | 35.7°C | 13.2°C | 88 mm | 74% | 0.1 m/s | 4.4 |
| 2013 | 29.2°C | 23.3°C | 17.3°C | 33.5°C | 12.1°C | 49 mm | 79% | 0.1 m/s | 4.9 |
| 2012 | 30.8°C | 23.9°C | 17.0°C | 35.9°C | 9.6°C | 74 mm | 71% | 0.1 m/s | 4.6 |
| 2011 | 30.2°C | 23.7°C | 17.3°C | 36.8°C | 13.3°C | 98 mm | 69% | 0.1 m/s | 4.5 |
| 2010 | 33.2°C | 25.7°C | 18.1°C | 37.1°C | 12.2°C | 99 mm | 63% | 0.1 m/s | 5.6 |
| 2009 | 28.4°C | 23.4°C | 18.3°C | 33.1°C | 8.9°C | 167 mm | 81% | 0.1 m/s | 3.9 |
| 2008 | 30.5°C | 24.1°C | 17.7°C | 35.2°C | 10.7°C | 29 mm | 72% | 0.1 m/s | 4.9 |
| 2007 | 30.6°C | 24.3°C | 17.9°C | 35.4°C | 10.3°C | 85 mm | 72% | 0.1 m/s | 5 |
| 2006 | 29.6°C | 23.0°C | 16.4°C | 34.7°C | 9.7°C | 72 mm | 72% | 0.1 m/s | 4.8 |
| 2005 | 31.5°C | 24.8°C | 18.1°C | 35.0°C | 14.2°C | 11 mm | 71% | 0.1 m/s | 5.5 |
| 2004 🌧️ | 27.5°C | 22.5°C | 17.6°C | 32.3°C | 11.9°C | 292 mm | 81% | 0.1 m/s | 4.4 |
| 2003 | 27.8°C | 21.9°C | 16.0°C | 32.1°C | 6.8°C | 66 mm | 79% | 0.1 m/s | 5 |
| 2002 | 31.1°C | 25.5°C | 19.8°C | 37.1°C | 16.7°C | 123 mm | 74% | 0.1 m/s | 3.8 |
| 2001 | 29.4°C | 22.4°C | 15.5°C | 34.1°C | 6.8°C | 77 mm | 67% | 0.1 m/s | 5 |
| 2000 | 27.9°C | 22.2°C | 16.4°C | 33.2°C | 8.3°C | 113 mm | 78% | 0.1 m/s | 4.2 |
| 1999 | 31.4°C | 23.5°C | 15.6°C | 38.1°C | 6.6°C | 59 mm | 58% | 0.1 m/s | 5 |
| 1998 | 30.9°C | 24.6°C | 18.3°C | 35.1°C | 11.7°C | 132 mm | 72% | 0.1 m/s | 4.7 |
| 1997 | 32.2°C | 24.9°C | 17.6°C | 37.0°C | 11.6°C | 126 mm | 64% | 0.1 m/s | 4.8 |
| 1996 | 30.2°C | 23.5°C | 16.8°C | 34.8°C | 11.8°C | 104 mm | 71% | 0.1 m/s | 4.4 |
| 1995 | 30.4°C | 23.8°C | 17.2°C | 35.3°C | 11.3°C | 73 mm | 73% | 0.1 m/s | 4.6 |
| 1994 ❄️ | 27.0°C | 21.5°C | 15.9°C | 32.0°C | 10.7°C | 111 mm | 83% | 0.1 m/s | 4.8 |
| 1993 | 32.0°C | 24.7°C | 17.5°C | 35.6°C | 7.3°C | 69 mm | 65% | 0.1 m/s | 4.9 |
| 1992 | 28.2°C | 23.0°C | 17.8°C | 31.7°C | 10.1°C | 118 mm | 82% | 0.1 m/s | 4 |
| 1991 | 30.5°C | 23.8°C | 17.1°C | 37.4°C | 8.1°C | 48 mm | 72% | 0.1 m/s | 4.9 |
| 1990 | 33.0°C | 25.4°C | 17.8°C | 38.5°C | 7.7°C | 43 mm | 60% | 0.1 m/s | 5.1 |
| 1989 | 28.5°C | 22.9°C | 17.2°C | 33.6°C | 10.1°C | 143 mm | 78% | 0.1 m/s | 3.9 |
| 1988 | 28.8°C | 23.3°C | 17.8°C | 33.5°C | 12.8°C | 148 mm | 80% | 0.1 m/s | 3.8 |
| 1987 | 30.1°C | 23.7°C | 17.3°C | 33.9°C | 10.9°C | 68 mm | 70% | 0.1 m/s | 4.5 |
| 1986 | 30.3°C | 24.4°C | 18.5°C | 34.9°C | 14.1°C | 91 mm | 77% | 0.1 m/s | 4.1 |
| 1985 | 30.3°C | 23.3°C | 16.2°C | 35.1°C | 7.6°C | 44 mm | 67% | 0.1 m/s | 5 |
| 1984 | 30.0°C | 22.8°C | 15.5°C | 36.2°C | 10.2°C | 8 mm | 66% | 0.1 m/s | 5.1 |
| 1983 | 28.2°C | 22.2°C | 16.2°C | 36.4°C | 6.3°C | 107 mm | 74% | 0.1 m/s | — |
| 1982 | 29.7°C | 23.0°C | 16.3°C | 34.4°C | 7.7°C | 62 mm | 68% | 0.1 m/s | — |
| 1981 | 31.3°C | 23.6°C | 15.9°C | 34.6°C | 7.9°C | 41 mm | 61% | 0.2 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 30.4°C with lows near 17.4°C (mean 23.9°C), based on 45 years of NASA POWER data.
September averages 89 mm of rainfall in Griffin, one of the drier months. The wettest on record was 292 mm in 2004.
The hottest September reached 38.9°C in 2019. The coldest dipped to 6.3°C in 1983.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.3°C. Daytime highs moved from 29.9°C to 31°C and overnight lows from 16°C to 17.7°C over the same span.
September is one of the warmer months of the year in Griffin and one of the drier months, so plan for around 30.4°C daytime highs and 17.4°C at night.
Not quite — September is the 9th coolest month in Griffin, averaging 23.9°C.
For September in Griffin, pack light, breathable clothing and sun protection, with typical highs of 30.4°C and lows of 17.4°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 71% — moderately humid.
Average wind speed in September is 0.1 m/s. The windiest September on record averaged 0.2 m/s (1981).
The wettest September on record was 2004 with 292 mm. On average, September sees 89 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 Griffin 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.
