September is one of the warmer months of the year in Greensburg, with average highs near 24.5°C and lows around 11.7°C (mean 18.1°C). It is about average for rainfall, averaging 89 mm of rainfall and 71% relative humidity across the period.
September is one of the warmer months of the year in Greensburg. Across 45 years of records, the warmest September in Greensburg was 2016 — when the month averaged 21.1°C — while the coldest were 1984 and 2006 at 15.8°C. Typical September days reach 24.5°C with nights near 11.7°C. The long-term trend is warming, about 0.6°C per decade.
September is about average for rainfall in Greensburg, averaging 89 mm of rainfall. The wettest September on record was 2018 with 209 mm, while the driest was 2014 at 25 mm.
Relative humidity in Greensburg during September averages 71%. The most humid September was 2011 at 85%, and the least humid was 2005 at 61%.
September receives about 4.2 kWh/m²/day of solar energy in Greensburg. The sunniest September was 2007 at 5 kWh/m²/day, and the cloudiest was 1993 at 3.3.
Average wind speed in Greensburg during September is 0.1 m/s. The windiest Septembers were 2022, 2023 and 2025, among others at 0.1 m/s, while the calmest were 2018 and 2024 at 0 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 17.3°C | 17.3°C | 18.1°C | 19.0°C | 18.8°C | +1.5°C |
| Avg High | 23.8°C | 23.8°C | 24.5°C | 25.4°C | 25.2°C | +1.4°C |
| Avg Low | 10.9°C | 10.9°C | 11.7°C | 12.7°C | 12.5°C | +1.6°C |
| Avg Rain | 83 mm | 92 mm | 91 mm | 99 mm | 72 mm | -10 mm |
September temperatures in Greensburg have risen by about 1.7°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 0.2°C (1989) to a record high of 34.5°C (2002).
Rainfall in September is about average for rainfall, averaging 89 mm, with a wettest year of 209 mm.
One of the best times to visit Greensburg
September is one of the best times to visit Greensburg. Expect days averaging 24.5°C and nights around 11.7°C (mean 18.1°C) — warmer than Greensburg'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 | 27.0°C | 19.9°C | 12.8°C | 30.4°C | 6.7°C | 65 mm | 64% | 0.1 m/s | 4.6 |
| 2024 | 26.0°C | 19.5°C | 13.0°C | 30.9°C | 5.9°C | 68 mm | 70% | 0 m/s | 4.4 |
| 2023 | 24.9°C | 18.8°C | 12.6°C | 33.5°C | 6.7°C | 54 mm | 73% | 0.1 m/s | 4.4 |
| 2022 | 23.4°C | 17.8°C | 12.3°C | 29.6°C | 3.6°C | 103 mm | 78% | 0.1 m/s | 4 |
| 2021 | 24.3°C | 18.4°C | 12.4°C | 29.6°C | 6.9°C | 108 mm | 77% | 0.1 m/s | 4.4 |
| 2020 | 25.4°C | 18.6°C | 11.8°C | 32.2°C | 3.2°C | 36 mm | 67% | 0.1 m/s | 4.4 |
| 2019 | 27.4°C | 20.7°C | 14.0°C | 31.9°C | 9.4°C | 59 mm | 71% | 0.1 m/s | 4.6 |
| 2018 🌧️ | 25.0°C | 20.2°C | 15.4°C | 34.4°C | 7.4°C | 209 mm | 84% | 0 m/s | 3.5 |
| 2017 | 25.8°C | 19.1°C | 12.4°C | 32.7°C | 5.0°C | 33 mm | 68% | 0.1 m/s | 4.4 |
| 2016 🔥 | 27.9°C | 21.1°C | 14.2°C | 33.0°C | 8.6°C | 72 mm | 66% | 0.1 m/s | 4.7 |
| 2015 | 27.1°C | 20.5°C | 13.9°C | 34.4°C | 7.4°C | 101 mm | 67% | 0.1 m/s | 4.5 |
| 2014 | 25.2°C | 18.2°C | 11.3°C | 32.3°C | 5.2°C | 25 mm | 69% | 0.1 m/s | 4.6 |
| 2013 | 24.0°C | 17.0°C | 10.1°C | 31.9°C | 2.4°C | 49 mm | 71% | 0.1 m/s | 4.4 |
| 2012 | 23.8°C | 17.5°C | 11.2°C | 32.0°C | 4.4°C | 129 mm | 72% | 0.1 m/s | 4 |
| 2011 | 22.7°C | 17.8°C | 13.0°C | 34.1°C | 3.1°C | 192 mm | 85% | 0.1 m/s | 3.5 |
| 2010 | 25.0°C | 18.4°C | 11.8°C | 34.1°C | 7.6°C | 116 mm | 65% | 0.1 m/s | 4.3 |
| 2009 | 23.5°C | 17.7°C | 11.9°C | 28.7°C | 5.7°C | 67 mm | 72% | 0.1 m/s | 3.9 |
| 2008 | 25.1°C | 18.7°C | 12.3°C | 32.6°C | 7.4°C | 87 mm | 70% | 0.1 m/s | 4.3 |
| 2007 | 26.1°C | 19.0°C | 11.9°C | 32.6°C | 4.4°C | 45 mm | 70% | 0.1 m/s | 5 |
| 2006 | 20.8°C | 15.8°C | 10.9°C | 26.9°C | 4.1°C | 123 mm | 81% | 0.1 m/s | 3.5 |
| 2005 | 27.8°C | 20.5°C | 13.1°C | 32.6°C | 4.8°C | 40 mm | 61% | 0.1 m/s | 4.8 |
| 2004 | 23.6°C | 18.1°C | 12.5°C | 28.0°C | 4.4°C | 199 mm | 81% | 0.1 m/s | 4.4 |
| 2003 | 22.1°C | 16.8°C | 11.4°C | 26.3°C | 4.5°C | 128 mm | 82% | 0.1 m/s | 3.6 |
| 2002 | 27.3°C | 20.1°C | 13.0°C | 34.5°C | 8.0°C | 85 mm | 62% | 0.1 m/s | 4.6 |
| 2001 | 24.4°C | 17.0°C | 9.7°C | 32.8°C | 3.1°C | 53 mm | 63% | 0.1 m/s | 4.7 |
| 2000 | 23.9°C | 17.0°C | 10.1°C | 32.3°C | 0.4°C | 88 mm | 70% | 0.1 m/s | 4.2 |
| 1999 | 25.5°C | 18.3°C | 11.0°C | 32.6°C | 0.9°C | 80 mm | 64% | 0.1 m/s | 4.3 |
| 1998 | 26.8°C | 19.6°C | 12.5°C | 34.2°C | 5.0°C | 57 mm | 65% | 0.1 m/s | 4.7 |
| 1997 | 23.2°C | 16.7°C | 10.2°C | 29.2°C | 4.0°C | 92 mm | 72% | 0.1 m/s | 4.2 |
| 1996 | 21.8°C | 16.9°C | 12.0°C | 29.1°C | 6.4°C | 182 mm | 82% | 0.1 m/s | 3.5 |
| 1995 | 24.2°C | 17.2°C | 10.1°C | 31.4°C | 1.0°C | 44 mm | 63% | 0.1 m/s | 4.2 |
| 1994 | 22.2°C | 16.0°C | 9.9°C | 28.5°C | 4.8°C | 61 mm | 75% | 0.1 m/s | 4.2 |
| 1993 | 23.1°C | 17.1°C | 11.1°C | 32.5°C | 1.0°C | 118 mm | 72% | 0.1 m/s | 3.3 |
| 1992 | 23.6°C | 17.1°C | 10.5°C | 28.7°C | 1.4°C | 85 mm | 74% | 0.1 m/s | 4.1 |
| 1991 | 24.9°C | 17.8°C | 10.7°C | 33.1°C | 2.2°C | 63 mm | 62% | 0.1 m/s | 4.2 |
| 1990 | 22.3°C | 16.6°C | 10.9°C | 29.3°C | 1.8°C | 136 mm | 80% | 0.1 m/s | 3.7 |
| 1989 | 23.3°C | 17.2°C | 11.1°C | 29.6°C | 0.2°C | 112 mm | 78% | 0.1 m/s | 3.8 |
| 1988 | 23.5°C | 16.7°C | 9.9°C | 29.6°C | 5.6°C | 92 mm | 73% | 0.1 m/s | 4.1 |
| 1987 | 22.3°C | 17.1°C | 11.9°C | 26.4°C | 3.3°C | 133 mm | 81% | 0.1 m/s | 3.8 |
| 1986 | 25.3°C | 18.9°C | 12.6°C | 30.1°C | 2.1°C | 88 mm | 71% | 0.1 m/s | 4.3 |
| 1985 | 25.9°C | 18.6°C | 11.2°C | 31.8°C | 3.1°C | 31 mm | 62% | 0.1 m/s | 4.7 |
| 1984 ❄️ | 22.5°C | 15.8°C | 9.2°C | 30.4°C | 2.5°C | 43 mm | 72% | 0.1 m/s | 4.5 |
| 1983 | 25.5°C | 18.2°C | 10.9°C | 33.3°C | 1.6°C | 70 mm | 63% | 0.1 m/s | — |
| 1982 | 23.9°C | 17.2°C | 10.6°C | 31.6°C | 4.9°C | 74 mm | 70% | 0.1 m/s | — |
| 1981 | 21.7°C | 16.1°C | 10.6°C | 27.8°C | 2.3°C | 102 mm | 77% | 0.1 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 24.5°C with lows near 11.7°C (mean 18.1°C), based on 45 years of NASA POWER data.
September averages 89 mm of rainfall in Greensburg, about average for rainfall. The wettest on record was 209 mm in 2018.
The hottest September reached 34.5°C in 2002. The coldest dipped to 0.2°C in 1989.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.7°C. Daytime highs moved from 23.9°C to 25.1°C and overnight lows from 10.5°C to 12.6°C over the same span.
September is one of the warmer months of the year in Greensburg and about average for rainfall, so plan for around 24.5°C daytime highs and 11.7°C at night.
Not quite — September is the 9th coolest month in Greensburg, averaging 18.1°C.
For September in Greensburg, pack light layers you can adjust through the day, with typical highs of 24.5°C and lows of 11.7°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 0.1 m/s (1981).
The wettest September on record was 2018 with 209 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 Greensburg 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.
