September is one of the warmer months of the year in Reading, with average highs near 24.7°C and lows around 12.6°C (mean 18.7°C). It is a relatively wet time of year, averaging 115 mm of rainfall and 72% relative humidity across the period.
September is one of the warmer months of the year in Reading. Across 45 years of records, the warmest September in Reading was 2005 — when the month averaged 21.3°C — while the coldest was 1984 at 16.3°C. Typical September days reach 24.7°C with nights near 12.6°C. The long-term trend is warming, about 0.5°C per decade.
September is a relatively wet time of year in Reading, averaging 115 mm of rainfall. The wettest September on record was 2011 with 360 mm, while the driest was 2019 at 24 mm.
Relative humidity in Reading during September averages 72%. The most humid September was 2011 at 88%, and the least humid was 1983 at 59%.
September receives about 4.2 kWh/m²/day of solar energy in Reading. The sunniest September was 2007 at 5 kWh/m²/day, and the cloudiest was 2018 at 3.1.
Average wind speed in Reading during September is 0.3 m/s. The windiest Septembers were 2023, 2024 and 2025, among others at 0.3 m/s, while the calmest was 2018 at 0.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 18.0°C | 17.9°C | 18.5°C | 19.6°C | 19.5°C | +1.5°C |
| Avg High | 24.3°C | 24.0°C | 24.6°C | 25.7°C | 25.4°C | +1.1°C |
| Avg Low | 11.7°C | 11.8°C | 12.5°C | 13.6°C | 13.5°C | +1.8°C |
| Avg Rain | 94 mm | 116 mm | 121 mm | 128 mm | 112 mm | +18 mm |
September temperatures in Reading have risen by about 1.5°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 0.8°C (2000) to a record high of 36°C (2023).
Rainfall in September is a relatively wet time of year, averaging 115 mm, with a wettest year of 360 mm.
One of the best times to visit Reading
September is one of the best times to visit Reading. Expect days averaging 24.7°C and nights around 12.6°C (mean 18.7°C) — warmer than Reading's yearly average — with higher rainfall (115 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 | 27.4°C | 20.8°C | 14.1°C | 31.4°C | 8.7°C | 60 mm | 65% | 0.3 m/s | 4.4 |
| 2024 | 25.7°C | 19.8°C | 13.9°C | 30.6°C | 7.6°C | 48 mm | 72% | 0.3 m/s | 4.1 |
| 2023 | 25.4°C | 19.6°C | 13.8°C | 36.0°C | 8.0°C | 140 mm | 75% | 0.3 m/s | 4.1 |
| 2022 | 24.8°C | 19.0°C | 13.2°C | 31.7°C | 5.2°C | 108 mm | 73% | 0.3 m/s | 4.3 |
| 2021 | 23.9°C | 18.8°C | 13.8°C | 28.8°C | 8.0°C | 242 mm | 83% | 0.3 m/s | 4.2 |
| 2020 | 25.2°C | 18.8°C | 12.4°C | 30.2°C | 3.1°C | 74 mm | 70% | 0.3 m/s | 4.1 |
| 2019 | 27.8°C | 21.1°C | 14.3°C | 34.3°C | 7.1°C | 24 mm | 66% | 0.3 m/s | 4.3 |
| 2018 | 24.6°C | 20.1°C | 15.7°C | 31.1°C | 8.2°C | 210 mm | 87% | 0.2 m/s | 3.1 |
| 2017 | 25.3°C | 19.4°C | 13.4°C | 33.6°C | 6.9°C | 63 mm | 74% | 0.3 m/s | 4.4 |
| 2016 | 27.6°C | 20.9°C | 14.3°C | 34.1°C | 7.2°C | 101 mm | 65% | 0.3 m/s | 4.5 |
| 2015 | 27.0°C | 20.6°C | 14.2°C | 34.9°C | 9.2°C | 114 mm | 68% | 0.3 m/s | 4.5 |
| 2014 | 25.8°C | 19.3°C | 12.8°C | 32.3°C | 5.8°C | 41 mm | 67% | 0.3 m/s | 4.4 |
| 2013 | 24.8°C | 17.7°C | 10.7°C | 33.6°C | 3.3°C | 47 mm | 67% | 0.3 m/s | 4.9 |
| 2012 | 24.0°C | 18.3°C | 12.7°C | 33.0°C | 4.6°C | 149 mm | 75% | 0.3 m/s | 4.2 |
| 2011 🌧️ | 23.4°C | 18.9°C | 14.4°C | 28.4°C | 4.6°C | 360 mm | 88% | 0.3 m/s | 3.2 |
| 2010 | 26.5°C | 20.0°C | 13.5°C | 35.7°C | 7.3°C | 168 mm | 63% | 0.3 m/s | 4.5 |
| 2009 | 22.0°C | 16.9°C | 11.8°C | 26.8°C | 5.4°C | 89 mm | 80% | 0.3 m/s | 4 |
| 2008 | 25.1°C | 19.1°C | 13.2°C | 33.9°C | 6.5°C | 154 mm | 73% | 0.3 m/s | 4.3 |
| 2007 | 26.6°C | 19.9°C | 13.2°C | 32.0°C | 5.5°C | 41 mm | 69% | 0.3 m/s | 5 |
| 2006 | 21.5°C | 16.6°C | 11.6°C | 26.6°C | 4.4°C | 133 mm | 83% | 0.3 m/s | 3.6 |
| 2005 🔥 | 28.3°C | 21.3°C | 14.2°C | 34.0°C | 5.4°C | 26 mm | 60% | 0.3 m/s | 4.9 |
| 2004 | 24.4°C | 18.9°C | 13.4°C | 28.1°C | 5.6°C | 227 mm | 82% | 0.3 m/s | 4 |
| 2003 | 23.0°C | 18.0°C | 13.0°C | 26.2°C | 5.5°C | 197 mm | 84% | 0.3 m/s | 3.7 |
| 2002 | 27.0°C | 20.2°C | 13.4°C | 35.8°C | 7.1°C | 125 mm | 64% | 0.3 m/s | 4.5 |
| 2001 | 24.4°C | 17.6°C | 10.7°C | 30.5°C | 4.1°C | 103 mm | 66% | 0.3 m/s | 4.6 |
| 2000 | 23.3°C | 16.9°C | 10.5°C | 31.3°C | 0.8°C | 111 mm | 73% | 0.3 m/s | 4.1 |
| 1999 | 23.8°C | 18.1°C | 12.4°C | 32.1°C | 4.5°C | 269 mm | 77% | 0.3 m/s | 4 |
| 1998 | 26.7°C | 19.8°C | 13.0°C | 33.2°C | 4.1°C | 64 mm | 66% | 0.3 m/s | 4.3 |
| 1997 | 23.3°C | 17.2°C | 11.2°C | 30.3°C | 3.7°C | 82 mm | 71% | 0.3 m/s | 4.2 |
| 1996 | 23.7°C | 18.3°C | 12.8°C | 30.9°C | 6.0°C | 135 mm | 79% | 0.3 m/s | 3.7 |
| 1995 | 24.9°C | 18.0°C | 11.2°C | 32.4°C | 3.8°C | 68 mm | 62% | 0.3 m/s | 4.3 |
| 1994 | 22.5°C | 16.7°C | 10.9°C | 28.5°C | 6.1°C | 96 mm | 76% | 0.3 m/s | 4.2 |
| 1993 | 23.3°C | 17.9°C | 12.5°C | 31.3°C | 2.5°C | 174 mm | 77% | 0.3 m/s | 3.3 |
| 1992 | 23.6°C | 17.6°C | 11.6°C | 29.4°C | 3.1°C | 120 mm | 74% | 0.3 m/s | 3.8 |
| 1991 | 24.7°C | 18.1°C | 11.5°C | 33.9°C | 2.0°C | 80 mm | 66% | 0.3 m/s | 4.3 |
| 1990 | 23.6°C | 17.4°C | 11.1°C | 30.9°C | 2.1°C | 71 mm | 74% | 0.3 m/s | 4.2 |
| 1989 | 24.6°C | 18.8°C | 12.9°C | 34.0°C | 1.6°C | 103 mm | 73% | 0.3 m/s | 3.9 |
| 1988 | 23.3°C | 16.8°C | 10.3°C | 28.0°C | 4.7°C | 83 mm | 73% | 0.3 m/s | 4.4 |
| 1987 | 22.6°C | 17.5°C | 12.4°C | 26.6°C | 4.8°C | 221 mm | 82% | 0.3 m/s | 3.9 |
| 1986 | 24.4°C | 18.3°C | 12.1°C | 30.6°C | 3.0°C | 65 mm | 73% | 0.3 m/s | 3.9 |
| 1985 | 26.0°C | 19.3°C | 12.6°C | 33.8°C | 4.8°C | 139 mm | 66% | 0.3 m/s | 4.5 |
| 1984 ❄️ | 22.9°C | 16.3°C | 9.7°C | 29.5°C | 3.8°C | 35 mm | 72% | 0.3 m/s | 4.5 |
| 1983 | 26.6°C | 19.2°C | 11.8°C | 35.0°C | 3.6°C | 47 mm | 59% | 0.3 m/s | — |
| 1982 | 24.8°C | 18.3°C | 11.9°C | 30.8°C | 6.9°C | 77 mm | 69% | 0.3 m/s | — |
| 1981 | 23.6°C | 17.6°C | 11.5°C | 31.5°C | 3.8°C | 78 mm | 71% | 0.3 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 24.7°C with lows near 12.6°C (mean 18.7°C), based on 45 years of NASA POWER data.
September averages 115 mm of rainfall in Reading, a relatively wet time of year. The wettest on record was 360 mm in 2011.
The hottest September reached 36°C in 2023. The coldest dipped to 0.8°C in 2000.
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 24.8°C to 25.4°C and overnight lows from 11.5°C to 13.8°C over the same span.
September is one of the warmer months of the year in Reading and a relatively wet time of year, so plan for around 24.7°C daytime highs and 12.6°C at night.
Not quite — September is the 9th coolest month in Reading, averaging 18.7°C.
For September in Reading, pack light layers you can adjust through the day, with typical highs of 24.7°C and lows of 12.6°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 72% — moderately humid.
Average wind speed in September is 0.3 m/s. The windiest September on record averaged 0.3 m/s (1981).
The wettest September on record was 2011 with 360 mm. On average, September sees 115 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 Reading 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.
