September is one of the warmer months of the year in Athens, with average highs near 29.8°C and lows around 17°C (mean 23.4°C). It is about average for rainfall, averaging 96 mm of rainfall and 72% 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 27.4°C — while the coldest was 1994 at 20.7°C. Typical September days reach 29.8°C with nights near 17°C. The long-term trend is warming, about 0.5°C per decade.
September is about average for rainfall in Athens, averaging 96 mm of rainfall. The wettest September on record was 2004 with 303 mm, while the driest was 2005 at 10 mm.
Relative humidity in Athens during September averages 72%. The most humid September was 1992 at 82%, and the least humid was 1999 at 57%.
September receives about 4.7 kWh/m²/day of solar energy in Athens. The sunniest September was 2019 at 5.7 kWh/m²/day, and the cloudiest was 1988 at 3.8.
Average wind speed in Athens during September is 0.1 m/s. The windiest Septembers were 2021, 2023 and 2025, among others at 0.2 m/s, while the calmest were 2020, 2022 and 2024, 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 | 22.7°C | 23.0°C | 23.1°C | 24.6°C | 23.6°C | +0.9°C |
| Avg High | 29.1°C | 29.6°C | 29.4°C | 31.1°C | 30.0°C | +0.9°C |
| Avg Low | 16.2°C | 16.5°C | 16.9°C | 18.0°C | 17.2°C | +1°C |
| Avg Rain | 93 mm | 101 mm | 117 mm | 70 mm | 101 mm | +8 mm |
September temperatures in Athens have risen by about 1.5°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 5.8°C (1983) to a record high of 39°C (2019).
Rainfall in September is about average for rainfall, averaging 96 mm, with a wettest year of 303 mm.
One of the best times to visit Athens
September is one of the best times to visit Athens. Expect days averaging 29.8°C and nights around 17°C (mean 23.4°C) — warmer than Athens's yearly average — with higher rainfall (96 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 | 30.4°C | 23.8°C | 17.1°C | 34.7°C | 11.8°C | 47 mm | 71% | 0.2 m/s | 5.3 |
| 2024 | 30.3°C | 24.6°C | 18.9°C | 37.4°C | 15.6°C | 204 mm | 73% | 0.1 m/s | 4.2 |
| 2023 | 31.1°C | 24.1°C | 17.1°C | 36.2°C | 13.1°C | 43 mm | 69% | 0.2 m/s | 4.9 |
| 2022 | 30.3°C | 23.5°C | 16.7°C | 36.5°C | 8.6°C | 65 mm | 68% | 0.1 m/s | 5.1 |
| 2021 | 29.4°C | 23.0°C | 16.5°C | 33.7°C | 9.6°C | 85 mm | 73% | 0.2 m/s | 4.9 |
| 2020 | 28.4°C | 22.7°C | 17.1°C | 35.3°C | 8.7°C | 162 mm | 78% | 0.1 m/s | 4.4 |
| 2019 🔥 | 35.2°C | 27.4°C | 19.6°C | 39.0°C | 13.6°C | 15 mm | 60% | 0.2 m/s | 5.7 |
| 2018 | 33.4°C | 27.2°C | 21.0°C | 35.8°C | 19.5°C | 55 mm | 72% | 0.1 m/s | 4.9 |
| 2017 | 29.5°C | 22.8°C | 16.2°C | 35.0°C | 10.9°C | 100 mm | 70% | 0.2 m/s | 5.3 |
| 2016 | 33.0°C | 26.1°C | 19.1°C | 37.3°C | 11.0°C | 43 mm | 67% | 0.1 m/s | 5.2 |
| 2015 | 28.8°C | 23.1°C | 17.4°C | 35.1°C | 9.9°C | 93 mm | 77% | 0.1 m/s | 4.4 |
| 2014 | 30.5°C | 24.5°C | 18.5°C | 35.2°C | 12.1°C | 80 mm | 75% | 0.1 m/s | 4.2 |
| 2013 | 27.9°C | 22.3°C | 16.7°C | 32.0°C | 10.0°C | 59 mm | 80% | 0.1 m/s | 5 |
| 2012 | 29.7°C | 23.3°C | 16.9°C | 34.9°C | 9.3°C | 81 mm | 73% | 0.1 m/s | 4.8 |
| 2011 | 30.2°C | 23.7°C | 17.1°C | 37.9°C | 12.5°C | 73 mm | 68% | 0.1 m/s | 4.5 |
| 2010 | 32.8°C | 25.2°C | 17.7°C | 36.7°C | 13.6°C | 104 mm | 63% | 0.2 m/s | 5.5 |
| 2009 | 28.5°C | 23.1°C | 17.7°C | 32.3°C | 8.4°C | 261 mm | 78% | 0.1 m/s | 4.2 |
| 2008 | 30.0°C | 23.7°C | 17.5°C | 36.0°C | 12.2°C | 32 mm | 71% | 0.1 m/s | 4.9 |
| 2007 | 32.4°C | 25.2°C | 17.9°C | 36.4°C | 10.8°C | 40 mm | 63% | 0.1 m/s | 5 |
| 2006 | 29.2°C | 22.6°C | 16.1°C | 34.3°C | 9.2°C | 86 mm | 73% | 0.1 m/s | 4.8 |
| 2005 | 31.0°C | 24.2°C | 17.3°C | 34.4°C | 13.9°C | 10 mm | 70% | 0.2 m/s | 5.5 |
| 2004 🌧️ | 27.1°C | 22.1°C | 17.1°C | 32.1°C | 10.7°C | 303 mm | 82% | 0.1 m/s | 4.4 |
| 2003 | 27.7°C | 21.8°C | 15.8°C | 32.2°C | 6.9°C | 68 mm | 76% | 0.2 m/s | 5.1 |
| 2002 | 30.5°C | 24.6°C | 18.8°C | 37.8°C | 15.2°C | 174 mm | 75% | 0.1 m/s | 3.9 |
| 2001 | 29.3°C | 22.1°C | 14.9°C | 34.5°C | 6.3°C | 62 mm | 66% | 0.1 m/s | 5 |
| 2000 | 27.8°C | 21.8°C | 15.9°C | 32.9°C | 7.7°C | 137 mm | 78% | 0.2 m/s | 4.2 |
| 1999 | 31.3°C | 23.1°C | 14.9°C | 37.6°C | 6.5°C | 77 mm | 57% | 0.2 m/s | 5.1 |
| 1998 | 32.2°C | 25.1°C | 18.0°C | 35.8°C | 10.7°C | 87 mm | 68% | 0.1 m/s | 4.6 |
| 1997 | 30.9°C | 24.0°C | 17.0°C | 36.5°C | 11.4°C | 166 mm | 66% | 0.2 m/s | 4.6 |
| 1996 | 29.1°C | 22.6°C | 16.1°C | 35.1°C | 10.8°C | 125 mm | 73% | 0.1 m/s | 4.5 |
| 1995 | 27.9°C | 22.0°C | 16.2°C | 34.0°C | 8.6°C | 78 mm | 80% | 0.1 m/s | 4.5 |
| 1994 ❄️ | 26.4°C | 20.7°C | 15.1°C | 31.3°C | 8.9°C | 115 mm | 80% | 0.2 m/s | 4.9 |
| 1993 | 32.0°C | 24.5°C | 17.1°C | 36.9°C | 6.5°C | 65 mm | 64% | 0.1 m/s | 4.8 |
| 1992 | 27.5°C | 22.3°C | 17.1°C | 31.7°C | 8.3°C | 147 mm | 82% | 0.1 m/s | 4 |
| 1991 | 28.4°C | 22.3°C | 16.3°C | 35.2°C | 7.3°C | 52 mm | 77% | 0.2 m/s | 5.1 |
| 1990 | 30.6°C | 23.7°C | 16.7°C | 38.0°C | 7.1°C | 96 mm | 69% | 0.2 m/s | 5.2 |
| 1989 | 27.5°C | 22.2°C | 16.9°C | 33.6°C | 9.9°C | 232 mm | 79% | 0.1 m/s | 3.9 |
| 1988 | 28.0°C | 22.5°C | 17.0°C | 34.3°C | 11.7°C | 158 mm | 81% | 0.1 m/s | 3.8 |
| 1987 | 30.4°C | 23.7°C | 17.0°C | 34.4°C | 10.9°C | 68 mm | 69% | 0.1 m/s | 4.6 |
| 1986 | 30.4°C | 24.2°C | 18.0°C | 35.0°C | 13.9°C | 78 mm | 75% | 0.1 m/s | 4.1 |
| 1985 | 29.7°C | 22.6°C | 15.4°C | 35.0°C | 7.4°C | 38 mm | 68% | 0.1 m/s | 5.1 |
| 1984 | 28.5°C | 21.6°C | 14.6°C | 34.3°C | 8.9°C | 15 mm | 68% | 0.2 m/s | 5 |
| 1983 | 27.8°C | 21.8°C | 15.8°C | 35.5°C | 5.8°C | 136 mm | 74% | 0.2 m/s | — |
| 1982 | 28.7°C | 22.2°C | 15.7°C | 33.8°C | 7.3°C | 59 mm | 70% | 0.2 m/s | — |
| 1981 | 31.0°C | 23.2°C | 15.4°C | 33.9°C | 8.2°C | 54 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 29.8°C with lows near 17°C (mean 23.4°C), based on 45 years of NASA POWER data.
September averages 96 mm of rainfall in Athens, about average for rainfall. The wettest on record was 303 mm in 2004.
The hottest September reached 39°C in 2019. The coldest dipped to 5.8°C in 1983.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.5°C. Daytime highs moved from 29.1°C to 30.3°C and overnight lows from 15.4°C to 17.3°C over the same span.
September is one of the warmer months of the year in Athens and about average for rainfall, so plan for around 29.8°C daytime highs and 17°C at night.
Not quite — September is the 9th coolest month in Athens, averaging 23.4°C.
For September in Athens, pack light layers you can adjust through the day, with typical highs of 29.8°C and lows of 17°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 72% — 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 303 mm. On average, September sees 96 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.
