September is one of the warmer months of the year in Smyrna, with average highs near 28.6°C and lows around 16.1°C (mean 22.4°C). It is one of the drier months, averaging 95 mm of rainfall and 68% relative humidity across the period.
September is one of the warmer months of the year in Smyrna. Across 45 years of records, the warmest September in Smyrna was 2019 — when the month averaged 26.8°C — while the coldest was 1982 at 20.1°C. Typical September days reach 28.6°C with nights near 16.1°C. The long-term trend is warming, about 0.3°C per decade.
September is one of the drier months in Smyrna, averaging 95 mm of rainfall. The wettest September on record was 1989 with 216 mm, while the driest was 2019 at 14 mm.
Relative humidity in Smyrna during September averages 68%. The most humid September was 1989 at 83%, and the least humid was 1999 at 44%.
September receives about 4.7 kWh/m²/day of solar energy in Smyrna. The sunniest September was 2019 at 5.6 kWh/m²/day, and the cloudiest was 1989 at 3.9.
Average wind speed in Smyrna during September is 1.4 m/s. The windiest Septembers were 2006, 2008 and 2011, among others at 1.6 m/s, while the calmest was 2025 at 1.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 21.5°C | 22.4°C | 22.5°C | 22.9°C | 22.4°C | +0.9°C |
| Avg High | 27.7°C | 29.0°C | 28.8°C | 29.0°C | 28.6°C | +0.9°C |
| Avg Low | 15.4°C | 15.8°C | 16.3°C | 16.7°C | 16.2°C | +0.8°C |
| Avg Rain | 98 mm | 91 mm | 97 mm | 87 mm | 106 mm | +9 mm |
September temperatures in Smyrna have risen by about 1.5°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 3.8°C (1983) to a record high of 39.3°C (1990).
Rainfall in September is one of the drier months, averaging 95 mm, with a wettest year of 216 mm.
One of the best times to visit Smyrna
September is one of the best times to visit Smyrna. Expect days averaging 28.6°C and nights around 16.1°C (mean 22.4°C) — warmer than Smyrna's yearly average — with higher rainfall (95 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 | 30.3°C | 23.6°C | 16.8°C | 34.2°C | 10.8°C | 118 mm | 64% | 1.1 m/s | 5 |
| 2024 | 29.8°C | 23.6°C | 17.4°C | 35.6°C | 9.7°C | 152 mm | 65% | 1.4 m/s | 4.2 |
| 2023 | 30.0°C | 23.3°C | 16.5°C | 33.7°C | 11.8°C | 43 mm | 64% | 1.2 m/s | 4.9 |
| 2022 | 28.2°C | 21.6°C | 15.1°C | 35.6°C | 6.4°C | 91 mm | 69% | 1.4 m/s | 5.2 |
| 2021 | 26.8°C | 21.3°C | 15.8°C | 31.3°C | 8.5°C | 134 mm | 77% | 1.2 m/s | 4.9 |
| 2020 | 26.5°C | 21.0°C | 15.5°C | 32.0°C | 7.9°C | 98 mm | 78% | 1.3 m/s | 4.4 |
| 2019 🔥 | 33.8°C | 26.8°C | 19.8°C | 37.1°C | 15.5°C | 14 mm | 60% | 1.2 m/s | 5.6 |
| 2018 | 29.8°C | 24.8°C | 19.7°C | 35.5°C | 14.5°C | 176 mm | 77% | 1.3 m/s | 4.2 |
| 2017 | 26.5°C | 20.7°C | 14.8°C | 31.1°C | 9.5°C | 92 mm | 75% | 1.4 m/s | 4.9 |
| 2016 | 31.2°C | 24.4°C | 17.6°C | 35.1°C | 8.6°C | 56 mm | 65% | 1.3 m/s | 5.5 |
| 2015 | 28.9°C | 22.7°C | 16.5°C | 34.5°C | 9.3°C | 72 mm | 69% | 1.2 m/s | 4.8 |
| 2014 | 28.5°C | 22.5°C | 16.5°C | 31.9°C | 8.0°C | 30 mm | 72% | 1.3 m/s | 4.6 |
| 2013 | 28.1°C | 22.2°C | 16.3°C | 32.9°C | 9.5°C | 72 mm | 75% | 1.2 m/s | 5.1 |
| 2012 | 26.7°C | 20.9°C | 15.1°C | 32.5°C | 4.9°C | 148 mm | 73% | 1.4 m/s | 4.7 |
| 2011 | 25.8°C | 20.4°C | 15.0°C | 39.1°C | 8.9°C | 170 mm | 73% | 1.6 m/s | 4.3 |
| 2010 | 30.3°C | 23.2°C | 16.1°C | 36.0°C | 9.3°C | 35 mm | 62% | 1.4 m/s | 5.2 |
| 2009 | 26.7°C | 22.1°C | 17.5°C | 31.1°C | 7.5°C | 206 mm | 80% | 1.2 m/s | 4 |
| 2008 | 30.3°C | 23.6°C | 16.8°C | 34.7°C | 11.6°C | 17 mm | 63% | 1.6 m/s | 4.7 |
| 2007 | 31.3°C | 24.6°C | 17.8°C | 36.3°C | 9.6°C | 64 mm | 59% | 1.3 m/s | 4.9 |
| 2006 | 27.1°C | 20.8°C | 14.5°C | 33.0°C | 7.0°C | 99 mm | 69% | 1.6 m/s | 4.7 |
| 2005 | 30.3°C | 23.6°C | 17.0°C | 34.0°C | 7.2°C | 48 mm | 67% | 1.3 m/s | 5.3 |
| 2004 | 28.1°C | 22.0°C | 15.9°C | 33.7°C | 9.6°C | 100 mm | 74% | 1.6 m/s | 4.9 |
| 2003 | 26.6°C | 20.7°C | 14.8°C | 32.2°C | 4.6°C | 149 mm | 74% | 1.4 m/s | 5.2 |
| 2002 | 30.5°C | 24.3°C | 18.0°C | 36.7°C | 9.9°C | 151 mm | 66% | 1.5 m/s | 4.4 |
| 2001 | 27.9°C | 21.2°C | 14.5°C | 34.1°C | 5.1°C | 70 mm | 65% | 1.5 m/s | 4.8 |
| 2000 | 29.0°C | 22.4°C | 15.7°C | 33.7°C | 6.1°C | 72 mm | 63% | 1.6 m/s | 4.5 |
| 1999 | 30.5°C | 22.7°C | 14.9°C | 37.8°C | 6.9°C | 39 mm | 44% | 1.5 m/s | 5.3 |
| 1998 | 33.2°C | 25.8°C | 18.4°C | 37.9°C | 10.4°C | 23 mm | 54% | 1.3 m/s | 5.2 |
| 1997 | 29.1°C | 22.2°C | 15.3°C | 35.1°C | 9.2°C | 125 mm | 66% | 1.4 m/s | 4.9 |
| 1996 | 26.7°C | 20.8°C | 14.8°C | 30.7°C | 6.7°C | 144 mm | 73% | 1.4 m/s | 4.5 |
| 1995 | 28.3°C | 21.7°C | 15.2°C | 34.0°C | 6.6°C | 102 mm | 66% | 1.4 m/s | 4.4 |
| 1994 | 28.3°C | 21.3°C | 14.2°C | 33.0°C | 8.0°C | 78 mm | 66% | 1.3 m/s | 4.9 |
| 1993 | 28.7°C | 21.9°C | 15.0°C | 36.5°C | 4.5°C | 89 mm | 64% | 1.6 m/s | 4.5 |
| 1992 | 26.2°C | 20.9°C | 15.6°C | 31.3°C | 4.0°C | 132 mm | 79% | 1.5 m/s | 4.1 |
| 1991 | 28.8°C | 22.8°C | 16.7°C | 35.7°C | 4.3°C | 91 mm | 66% | 1.4 m/s | 4.8 |
| 1990 | 30.5°C | 24.0°C | 17.4°C | 39.3°C | 5.6°C | 88 mm | 61% | 1.4 m/s | 4.9 |
| 1989 🌧️ | 25.3°C | 20.3°C | 15.3°C | 30.7°C | 3.9°C | 216 mm | 83% | 1.3 m/s | 3.9 |
| 1988 | 28.6°C | 22.5°C | 16.4°C | 34.1°C | 8.4°C | 124 mm | 72% | 1.6 m/s | 4 |
| 1987 | 28.6°C | 22.3°C | 16.0°C | 33.5°C | 10.4°C | 96 mm | 63% | 1.3 m/s | 4.5 |
| 1986 | 27.8°C | 22.7°C | 17.6°C | 32.2°C | 11.9°C | 145 mm | 78% | 1.4 m/s | 4.4 |
| 1985 | 28.2°C | 21.4°C | 14.6°C | 33.7°C | 6.3°C | 79 mm | 63% | 1.5 m/s | 5.1 |
| 1984 | 28.2°C | 21.1°C | 14.1°C | 35.0°C | 7.2°C | 19 mm | 59% | 1.6 m/s | 4.6 |
| 1983 | 29.4°C | 22.8°C | 16.1°C | 36.1°C | 3.8°C | 35 mm | 59% | 1.5 m/s | — |
| 1982 ❄️ | 25.7°C | 20.1°C | 14.5°C | 30.2°C | 6.3°C | 86 mm | 77% | 1.3 m/s | — |
| 1981 | 27.5°C | 20.5°C | 13.6°C | 32.3°C | 5.9°C | 77 mm | 66% | 1.4 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 16.1°C (mean 22.4°C), based on 45 years of NASA POWER data.
September averages 95 mm of rainfall in Smyrna, one of the drier months. The wettest on record was 216 mm in 1989.
The hottest September reached 39.3°C in 1990. The coldest dipped to 3.8°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 27.8°C to 29°C and overnight lows from 14.6°C to 16.3°C over the same span.
September is one of the warmer months of the year in Smyrna and one of the drier months, so plan for around 28.6°C daytime highs and 16.1°C at night.
Not quite — September is the 9th coolest month in Smyrna, averaging 22.4°C.
For September in Smyrna, pack light layers you can adjust through the day, with typical highs of 28.6°C and lows of 16.1°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 68% — moderately humid.
Average wind speed in September is 1.4 m/s. The windiest September on record averaged 1.6 m/s (1984).
The wettest September on record was 1989 with 216 mm. On average, September sees 95 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 Smyrna 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.
