September is one of the warmer months of the year in Athens, with average highs near 29.1°C and lows around 16.6°C (mean 22.9°C). It is one of the drier months, averaging 97 mm of rainfall and 68% relative humidity across the period.
September is one of the warmer months of the year in Athens. Across 45 years of records, the warmest September in Athens was 2019 — when the month averaged 27.6°C — while the coldest was 2011 at 20.5°C. Typical September days reach 29.1°C with nights near 16.6°C. The long-term trend is warming, about 0.4°C per decade.
September is one of the drier months in Athens, averaging 97 mm of rainfall. The wettest September on record was 1989 with 232 mm, while the driest was 1984 at 11 mm.
Relative humidity in Athens during September averages 68%. The most humid September was 1989 at 84%, and the least humid was 1999 at 42%.
September receives about 4.8 kWh/m²/day of solar energy in Athens. The sunniest Septembers were 2016 and 2019 at 5.6 kWh/m²/day, and the cloudiest was 2009 at 3.9.
Average wind speed in Athens during September is 1.1 m/s. The windiest Septembers were 1984, 2000 and 2004 at 1.3 m/s, while the calmest were 2021, 2023 and 2025, among others at 0.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 22.0°C | 23.0°C | 22.8°C | 23.7°C | 22.9°C | +0.9°C |
| Avg High | 28.2°C | 29.6°C | 29.0°C | 29.9°C | 29.0°C | +0.8°C |
| Avg Low | 15.8°C | 16.4°C | 16.7°C | 17.4°C | 16.8°C | +1°C |
| Avg Rain | 100 mm | 95 mm | 106 mm | 82 mm | 109 mm | +9 mm |
September temperatures in Athens have risen by about 1.3°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 3.9°C (2001) to a record high of 39.3°C (1990).
Rainfall in September is one of the drier months, averaging 97 mm, with a wettest year of 232 mm.
One of the best times to visit Athens
September is one of the best times to visit Athens. Expect days averaging 29.1°C and nights around 16.6°C (mean 22.9°C) — warmer than Athens's yearly average — with higher rainfall (97 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 | 30.6°C | 23.9°C | 17.3°C | 34.2°C | 10.9°C | 123 mm | 65% | 0.9 m/s | 5.1 |
| 2024 | 29.6°C | 23.7°C | 17.8°C | 34.0°C | 10.8°C | 145 mm | 68% | 1.2 m/s | 4.2 |
| 2023 | 30.9°C | 24.0°C | 17.2°C | 33.6°C | 12.6°C | 30 mm | 63% | 0.9 m/s | 5.1 |
| 2022 | 28.9°C | 22.3°C | 15.7°C | 36.3°C | 7.2°C | 92 mm | 68% | 1.1 m/s | 5.2 |
| 2021 | 26.8°C | 21.6°C | 16.3°C | 30.1°C | 8.7°C | 144 mm | 80% | 0.9 m/s | 4.9 |
| 2020 | 27.4°C | 21.9°C | 16.3°C | 32.1°C | 8.0°C | 119 mm | 77% | 1.1 m/s | 4.4 |
| 2019 🔥 | 34.6°C | 27.6°C | 20.6°C | 37.6°C | 16.4°C | 16 mm | 58% | 0.9 m/s | 5.6 |
| 2018 | 31.6°C | 26.0°C | 20.4°C | 36.4°C | 15.5°C | 140 mm | 72% | 1 m/s | 4.5 |
| 2017 | 27.3°C | 21.5°C | 15.7°C | 31.5°C | 9.3°C | 86 mm | 74% | 1.1 m/s | 5.1 |
| 2016 | 32.2°C | 25.5°C | 18.8°C | 35.8°C | 9.2°C | 28 mm | 62% | 1 m/s | 5.6 |
| 2015 | 29.3°C | 23.1°C | 16.8°C | 33.7°C | 9.3°C | 37 mm | 69% | 0.9 m/s | 4.9 |
| 2014 | 29.6°C | 23.6°C | 17.5°C | 32.6°C | 9.3°C | 28 mm | 71% | 1 m/s | 5 |
| 2013 | 29.0°C | 22.9°C | 16.7°C | 33.8°C | 10.2°C | 82 mm | 73% | 0.9 m/s | 5.2 |
| 2012 | 27.3°C | 21.4°C | 15.5°C | 33.4°C | 5.7°C | 176 mm | 74% | 1 m/s | 4.8 |
| 2011 ❄️ | 25.9°C | 20.5°C | 15.2°C | 38.0°C | 9.3°C | 182 mm | 74% | 1.2 m/s | 4.4 |
| 2010 | 31.7°C | 24.4°C | 17.1°C | 36.1°C | 9.3°C | 46 mm | 58% | 1 m/s | 5.3 |
| 2009 | 27.1°C | 22.6°C | 18.1°C | 31.2°C | 7.6°C | 215 mm | 81% | 0.9 m/s | 3.9 |
| 2008 | 29.5°C | 23.2°C | 17.0°C | 33.7°C | 11.3°C | 23 mm | 67% | 1.2 m/s | 4.5 |
| 2007 | 30.9°C | 24.4°C | 17.9°C | 34.3°C | 9.2°C | 59 mm | 63% | 1 m/s | 4.9 |
| 2006 | 28.5°C | 21.8°C | 15.1°C | 33.2°C | 6.6°C | 89 mm | 65% | 1.2 m/s | 5 |
| 2005 | 31.1°C | 24.3°C | 17.5°C | 34.8°C | 7.4°C | 83 mm | 66% | 1.1 m/s | 5.3 |
| 2004 | 27.7°C | 21.9°C | 16.1°C | 33.3°C | 8.9°C | 125 mm | 75% | 1.3 m/s | 5.2 |
| 2003 | 28.4°C | 21.9°C | 15.4°C | 33.1°C | 5.1°C | 127 mm | 70% | 1.1 m/s | 5.4 |
| 2002 | 30.6°C | 24.8°C | 18.9°C | 36.8°C | 12.4°C | 154 mm | 68% | 1.2 m/s | 4.3 |
| 2001 | 26.7°C | 20.8°C | 14.9°C | 31.7°C | 3.9°C | 102 mm | 71% | 1.1 m/s | 4.9 |
| 2000 | 29.1°C | 22.6°C | 16.2°C | 34.8°C | 6.2°C | 86 mm | 63% | 1.3 m/s | 4.6 |
| 1999 | 31.2°C | 23.6°C | 15.9°C | 38.9°C | 7.5°C | 28 mm | 42% | 1.2 m/s | 5.2 |
| 1998 | 33.2°C | 26.0°C | 18.8°C | 38.3°C | 11.7°C | 35 mm | 55% | 1 m/s | 5.2 |
| 1997 | 29.9°C | 23.1°C | 16.2°C | 35.3°C | 10.5°C | 123 mm | 65% | 1 m/s | 5.2 |
| 1996 | 27.4°C | 21.3°C | 15.2°C | 32.0°C | 6.9°C | 152 mm | 73% | 1.1 m/s | 4.7 |
| 1995 | 28.8°C | 22.3°C | 15.8°C | 34.4°C | 7.0°C | 119 mm | 67% | 1.1 m/s | 4.7 |
| 1994 | 28.8°C | 21.8°C | 14.9°C | 32.9°C | 9.0°C | 81 mm | 68% | 1 m/s | 4.9 |
| 1993 | 29.1°C | 22.3°C | 15.5°C | 36.5°C | 5.6°C | 108 mm | 66% | 1.2 m/s | 4.7 |
| 1992 | 26.5°C | 21.3°C | 16.1°C | 31.6°C | 5.0°C | 140 mm | 80% | 1.1 m/s | 4.2 |
| 1991 | 29.4°C | 23.3°C | 17.1°C | 35.8°C | 5.3°C | 81 mm | 66% | 1 m/s | 5.1 |
| 1990 | 31.2°C | 24.7°C | 18.1°C | 39.3°C | 5.4°C | 80 mm | 60% | 1 m/s | 5 |
| 1989 🌧️ | 25.5°C | 20.7°C | 15.8°C | 30.8°C | 5.2°C | 232 mm | 84% | 1 m/s | 4 |
| 1988 | 28.2°C | 22.7°C | 17.2°C | 32.7°C | 9.2°C | 179 mm | 76% | 1.1 m/s | 4 |
| 1987 | 28.5°C | 22.3°C | 16.1°C | 33.8°C | 10.7°C | 129 mm | 65% | 1 m/s | 4.8 |
| 1986 | 28.8°C | 23.4°C | 18.0°C | 32.4°C | 12.6°C | 122 mm | 77% | 1 m/s | 4.5 |
| 1985 | 27.7°C | 21.3°C | 14.9°C | 32.3°C | 6.3°C | 78 mm | 68% | 1.1 m/s | 5.1 |
| 1984 | 29.5°C | 22.1°C | 14.6°C | 36.1°C | 9.1°C | 11 mm | 58% | 1.3 m/s | 5 |
| 1983 | 28.9°C | 22.6°C | 16.3°C | 35.6°C | 4.9°C | 60 mm | 64% | 1.1 m/s | — |
| 1982 | 28.4°C | 21.9°C | 15.5°C | 33.3°C | 6.9°C | 41 mm | 68% | 1 m/s | — |
| 1981 | 28.3°C | 21.2°C | 14.2°C | 32.1°C | 6.5°C | 43 mm | 65% | 1 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 29.1°C with lows near 16.6°C (mean 22.9°C), based on 45 years of NASA POWER data.
September averages 97 mm of rainfall in Athens, one of the drier months. The wettest on record was 232 mm in 1989.
The hottest September reached 39.3°C in 1990. The coldest dipped to 3.9°C in 2001.
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 28.6°C to 29.4°C and overnight lows from 15.1°C to 16.9°C over the same span.
September is one of the warmer months of the year in Athens and one of the drier months, so plan for around 29.1°C daytime highs and 16.6°C at night.
Not quite — September is the 9th coolest month in Athens, averaging 22.9°C.
For September in Athens, pack light layers you can adjust through the day, with typical highs of 29.1°C and lows of 16.6°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 68% — moderately humid.
Average wind speed in September is 1.1 m/s. The windiest September on record averaged 1.3 m/s (1984).
The wettest September on record was 1989 with 232 mm. On average, September sees 97 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 Athens 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.
