September is one of the warmer months of the year in Scranton, with average highs near 22.3°C and lows around 10.4°C (mean 16.4°C). It is a relatively wet time of year, averaging 109 mm of rainfall and 75% relative humidity across the period.
September is one of the warmer months of the year in Scranton. Across 45 years of records, the warmest September in Scranton was 2015 — when the month averaged 19°C — while the coldest was 1984 at 13.7°C. Typical September days reach 22.3°C with nights near 10.4°C. The long-term trend is warming, about 0.5°C per decade.
September is a relatively wet time of year in Scranton, averaging 109 mm of rainfall. The wettest September on record was 2011 with 319 mm, while the driest was 2019 at 23 mm.
Relative humidity in Scranton during September averages 75%. The most humid September was 2011 at 88%, and the least humid was 1983 at 61%.
September receives about 4 kWh/m²/day of solar energy in Scranton. The sunniest Septembers were 2005 and 2007 at 4.8 kWh/m²/day, and the cloudiest was 2018 at 3.
Average wind speed in Scranton during September is 0.1 m/s. The windiest Septembers were 2023, 2024 and 2025, among others at 0.1 m/s, while the calmest were 2011, 2018 and 2021, among others at 0 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 15.7°C | 15.6°C | 16.5°C | 17.3°C | 16.9°C | +1.2°C |
| Avg High | 21.8°C | 21.6°C | 22.4°C | 23.2°C | 22.5°C | +0.7°C |
| Avg Low | 9.6°C | 9.7°C | 10.5°C | 11.3°C | 11.3°C | +1.7°C |
| Avg Rain | 93 mm | 106 mm | 118 mm | 117 mm | 114 mm | +21 mm |
September temperatures in Scranton have risen by about 1.1°C between 1981–1985 and 2021–2025.
September has ranged from a record low of -2.4°C (1991) to a record high of 34.1°C (2002).
Rainfall in September is a relatively wet time of year, averaging 109 mm, with a wettest year of 319 mm.
One of the best times to visit Scranton
September is one of the best times to visit Scranton. Expect days averaging 22.3°C and nights around 10.4°C (mean 16.4°C) — warmer than Scranton's yearly average — with higher rainfall (109 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 | 24.6°C | 18.2°C | 11.7°C | 28.0°C | 6.3°C | 67 mm | 69% | 0.1 m/s | 4.4 |
| 2024 | 22.8°C | 17.2°C | 11.7°C | 27.7°C | 5.8°C | 57 mm | 77% | 0.1 m/s | 4.2 |
| 2023 | 21.7°C | 16.5°C | 11.3°C | 29.7°C | 4.2°C | 138 mm | 84% | 0.1 m/s | 4.1 |
| 2022 | 21.6°C | 16.2°C | 10.9°C | 28.4°C | 3.1°C | 133 mm | 80% | 0.1 m/s | 3.9 |
| 2021 | 21.8°C | 16.7°C | 11.7°C | 26.5°C | 4.9°C | 208 mm | 84% | 0 m/s | 3.9 |
| 2020 | 22.7°C | 16.5°C | 10.2°C | 28.8°C | 1.0°C | 79 mm | 72% | 0.1 m/s | 4.2 |
| 2019 | 23.5°C | 17.3°C | 11.1°C | 29.3°C | 5.0°C | 23 mm | 74% | 0.1 m/s | 4.1 |
| 2018 | 22.6°C | 18.0°C | 13.3°C | 29.4°C | 5.7°C | 199 mm | 87% | 0 m/s | 3 |
| 2017 | 23.3°C | 17.5°C | 11.6°C | 31.9°C | 3.9°C | 57 mm | 77% | 0.1 m/s | 4.3 |
| 2016 | 25.0°C | 18.5°C | 11.9°C | 31.3°C | 4.2°C | 78 mm | 67% | 0.1 m/s | 4.6 |
| 2015 🔥 | 25.4°C | 19.0°C | 12.5°C | 33.0°C | 7.4°C | 106 mm | 70% | 0.1 m/s | 4.5 |
| 2014 | 23.5°C | 16.9°C | 10.3°C | 30.7°C | 3.9°C | 35 mm | 71% | 0.1 m/s | 4.3 |
| 2013 | 21.6°C | 14.9°C | 8.2°C | 30.3°C | 1.3°C | 65 mm | 73% | 0.1 m/s | 4.6 |
| 2012 | 22.0°C | 16.3°C | 10.6°C | 29.5°C | 3.8°C | 141 mm | 76% | 0.1 m/s | 3.9 |
| 2011 🌧️ | 21.7°C | 17.2°C | 12.6°C | 28.6°C | 3.3°C | 319 mm | 88% | 0 m/s | 3.2 |
| 2010 | 23.5°C | 17.4°C | 11.3°C | 32.5°C | 4.6°C | 149 mm | 69% | 0.1 m/s | 4.1 |
| 2009 | 20.6°C | 15.3°C | 10.0°C | 25.3°C | 4.4°C | 64 mm | 80% | 0.1 m/s | 3.9 |
| 2008 | 23.2°C | 17.0°C | 10.8°C | 32.2°C | 4.1°C | 128 mm | 76% | 0.1 m/s | 4.2 |
| 2007 | 24.4°C | 17.8°C | 11.2°C | 31.1°C | 2.9°C | 61 mm | 71% | 0.1 m/s | 4.8 |
| 2006 | 19.2°C | 14.5°C | 9.8°C | 24.5°C | 2.7°C | 119 mm | 84% | 0.1 m/s | 3.3 |
| 2005 | 25.7°C | 18.8°C | 11.8°C | 31.9°C | 4.3°C | 35 mm | 64% | 0.1 m/s | 4.8 |
| 2004 | 22.0°C | 16.8°C | 11.5°C | 26.4°C | 4.6°C | 246 mm | 85% | 0 m/s | 4 |
| 2003 | 20.6°C | 15.7°C | 10.9°C | 25.5°C | 3.9°C | 210 mm | 86% | 0 m/s | 3.7 |
| 2002 | 24.6°C | 17.9°C | 11.2°C | 34.1°C | 4.2°C | 131 mm | 67% | 0.1 m/s | 4.2 |
| 2001 | 22.3°C | 15.5°C | 8.8°C | 29.0°C | 2.5°C | 114 mm | 69% | 0.1 m/s | 4.5 |
| 2000 | 21.9°C | 15.3°C | 8.8°C | 29.2°C | -2.3°C | 72 mm | 71% | 0 m/s | 3.9 |
| 1999 | 22.8°C | 17.0°C | 11.1°C | 33.0°C | 3.7°C | 212 mm | 75% | 0.1 m/s | 4 |
| 1998 | 23.9°C | 17.4°C | 10.9°C | 30.7°C | 3.5°C | 67 mm | 71% | 0.1 m/s | 4.3 |
| 1997 | 20.8°C | 15.0°C | 9.2°C | 27.2°C | 2.2°C | 84 mm | 74% | 0 m/s | 4.1 |
| 1996 | 21.0°C | 15.9°C | 10.7°C | 28.0°C | 3.7°C | 131 mm | 82% | 0 m/s | 3.6 |
| 1995 | 22.2°C | 15.3°C | 8.5°C | 29.2°C | 0.9°C | 75 mm | 66% | 0 m/s | 4.1 |
| 1994 | 19.9°C | 14.4°C | 8.9°C | 25.7°C | 4.5°C | 93 mm | 81% | 0.1 m/s | 3.8 |
| 1993 | 20.6°C | 15.3°C | 9.9°C | 29.1°C | -1.0°C | 149 mm | 80% | 0.1 m/s | 3.1 |
| 1992 | 21.3°C | 15.4°C | 9.6°C | 27.8°C | 0.2°C | 94 mm | 76% | 0 m/s | 3.8 |
| 1991 | 22.2°C | 15.5°C | 8.9°C | 31.7°C | -2.4°C | 84 mm | 67% | 0.1 m/s | 4.2 |
| 1990 | 21.1°C | 15.1°C | 9.1°C | 27.5°C | 0.5°C | 71 mm | 76% | 0.1 m/s | 4 |
| 1989 | 22.4°C | 16.4°C | 10.5°C | 32.0°C | -0.1°C | 120 mm | 75% | 0 m/s | 3.7 |
| 1988 | 21.1°C | 14.6°C | 8.1°C | 26.6°C | 1.6°C | 68 mm | 74% | 0.1 m/s | 4.3 |
| 1987 | 20.1°C | 15.1°C | 10.1°C | 24.8°C | 3.2°C | 186 mm | 85% | 0 m/s | 3.4 |
| 1986 | 21.6°C | 15.7°C | 9.8°C | 27.7°C | 1.7°C | 65 mm | 75% | 0.1 m/s | 3.5 |
| 1985 | 23.2°C | 16.8°C | 10.3°C | 29.6°C | 2.6°C | 167 mm | 71% | 0.1 m/s | 4.5 |
| 1984 ❄️ | 19.6°C | 13.7°C | 7.7°C | 25.5°C | 1.6°C | 38 mm | 77% | 0.1 m/s | 4.6 |
| 1983 | 24.5°C | 17.2°C | 10.0°C | 32.2°C | 2.5°C | 48 mm | 61% | 0.1 m/s | — |
| 1982 | 22.8°C | 16.4°C | 10.0°C | 29.2°C | 3.8°C | 53 mm | 68% | 0.1 m/s | — |
| 1981 | 20.9°C | 15.3°C | 9.6°C | 28.1°C | 1.9°C | 88 mm | 74% | 0 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 22.3°C with lows near 10.4°C (mean 16.4°C), based on 45 years of NASA POWER data.
September averages 109 mm of rainfall in Scranton, a relatively wet time of year. The wettest on record was 319 mm in 2011.
The hottest September reached 34.1°C in 2002. The coldest dipped to -2.4°C in 1991.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.1°C. Daytime highs moved from 22.2°C to 22.5°C and overnight lows from 9.5°C to 11.5°C over the same span.
September is one of the warmer months of the year in Scranton and a relatively wet time of year, so plan for around 22.3°C daytime highs and 10.4°C at night.
Not quite — September is the 9th coolest month in Scranton, averaging 16.4°C.
For September in Scranton, pack light layers you can adjust through the day, with typical highs of 22.3°C and lows of 10.4°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 75% — quite humid.
Average wind speed in September is 0.1 m/s. The windiest September on record averaged 0.1 m/s (1982).
The wettest September on record was 2011 with 319 mm. On average, September sees 109 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 Scranton 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.
