September is one of the cooler months of the year in Peterborough, with average highs near 19.4°C and lows around 5.7°C (mean 12.5°C). It is about average for rainfall, averaging 35 mm of rainfall and 64% relative humidity across the period.
September is one of the cooler months of the year in Peterborough. Across 45 years of records, the warmest September in Peterborough was 2023 — when the month averaged 16.1°C — while the coldest were 1984 and 1992 at 9.5°C. Typical September days reach 19.4°C with nights near 5.7°C. The long-term trend is warming, about 0.5°C per decade.
September is about average for rainfall in Peterborough, averaging 35 mm of rainfall. The wettest September on record was 2016 with 107 mm, while the driest were 2019 and 2023 at 6 mm.
Relative humidity in Peterborough during September averages 64%. The most humid September was 2010 at 79%, and the least humid was 2023 at 48%.
September receives about 5.3 kWh/m²/day of solar energy in Peterborough. The sunniest Septembers were 2018 and 2023 at 5.9 kWh/m²/day, and the cloudiest was 2010 at 4.5.
Average wind speed in Peterborough during September is 3.3 m/s. The windiest September was 1996 at 4.2 m/s, while the calmest were 1995 and 2004 at 2.8 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 11.7°C | 12.1°C | 13.0°C | 12.7°C | 13.8°C | +2.1°C |
| Avg High | 18.4°C | 18.7°C | 19.9°C | 19.6°C | 20.9°C | +2.5°C |
| Avg Low | 5.0°C | 5.5°C | 6.0°C | 5.8°C | 6.6°C | +1.6°C |
| Avg Rain | 31 mm | 45 mm | 37 mm | 32 mm | 23 mm | -7 mm |
September temperatures in Peterborough have risen by about 2.2°C between 1981–1985 and 2021–2025.
September has ranged from a record low of -1.4°C (2004) to a record high of 33.1°C (2023).
Rainfall in September is about average for rainfall, averaging 35 mm, with a wettest year of 107 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.6°C per decade while lows rose 0.3°C per decade, widening the gap between day and night.
A good time to visit Peterborough
September is a good time to visit Peterborough, with days averaging 19.4°C and nights around 5.7°C (mean 12.5°C, cooler than Peterborough's yearly average) and moderate rainfall. December and March are marginally more temperate, but September still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 21.0°C | 13.8°C | 6.7°C | 28.9°C | 4.1°C | 15 mm | 61% | 3.4 m/s | 5.6 |
| 2024 | 21.0°C | 13.4°C | 5.7°C | 30.0°C | 1.0°C | 9 mm | 55% | 3.3 m/s | 5.6 |
| 2023 🔥 | 24.1°C | 16.1°C | 8.0°C | 33.1°C | 1.6°C | 6 mm | 48% | 2.9 m/s | 5.9 |
| 2022 | 18.1°C | 12.1°C | 6.0°C | 22.8°C | 2.2°C | 55 mm | 72% | 3.3 m/s | 4.9 |
| 2021 | 20.2°C | 13.0°C | 5.8°C | 29.8°C | 2.8°C | 14 mm | 59% | 3.2 m/s | 5.6 |
| 2020 | 21.1°C | 14.2°C | 7.3°C | 28.8°C | 0.8°C | 39 mm | 59% | 3.6 m/s | 5.2 |
| 2019 | 21.8°C | 13.7°C | 5.6°C | 29.8°C | 0.7°C | 6 mm | 54% | 3.1 m/s | 5.7 |
| 2018 | 19.3°C | 11.6°C | 3.9°C | 26.1°C | 0.6°C | 7 mm | 55% | 2.9 m/s | 5.9 |
| 2017 | 20.2°C | 13.2°C | 6.2°C | 30.5°C | 3.1°C | 17 mm | 59% | 3.8 m/s | 5.3 |
| 2016 🌧️ | 16.5°C | 10.7°C | 4.9°C | 23.3°C | 1.8°C | 107 mm | 74% | 3.5 m/s | 4.6 |
| 2015 | 18.8°C | 12.0°C | 5.2°C | 26.5°C | 1.5°C | 25 mm | 67% | 2.9 m/s | 5.7 |
| 2014 | 19.5°C | 12.8°C | 6.1°C | 28.1°C | 1.2°C | 25 mm | 66% | 3.2 m/s | 5.5 |
| 2013 | 22.4°C | 15.5°C | 8.6°C | 27.8°C | 3.4°C | 35 mm | 63% | 3.6 m/s | 5.4 |
| 2012 | 20.4°C | 13.1°C | 5.9°C | 30.4°C | 2.4°C | 14 mm | 60% | 3.6 m/s | 5.6 |
| 2011 | 20.6°C | 13.2°C | 5.8°C | 30.9°C | 1.4°C | 22 mm | 59% | 3.6 m/s | 5.7 |
| 2010 | 16.5°C | 11.0°C | 5.5°C | 21.5°C | 1.4°C | 68 mm | 79% | 3.1 m/s | 4.5 |
| 2009 | 19.8°C | 12.9°C | 6.0°C | 29.2°C | 2.1°C | 72 mm | 64% | 3.9 m/s | 5.2 |
| 2008 | 20.2°C | 12.7°C | 5.2°C | 31.3°C | 1.5°C | 9 mm | 59% | 3.2 m/s | 5.7 |
| 2007 | 21.1°C | 13.6°C | 6.0°C | 31.0°C | 1.2°C | 18 mm | 55% | 3.6 m/s | 5.7 |
| 2006 | 21.6°C | 14.0°C | 6.3°C | 30.1°C | 2.0°C | 8 mm | 54% | 3.4 m/s | 5.8 |
| 2005 | 19.2°C | 12.8°C | 6.4°C | 28.2°C | 1.1°C | 61 mm | 67% | 3.2 m/s | 5.1 |
| 2004 | 18.7°C | 12.1°C | 5.5°C | 29.0°C | -1.4°C | 39 mm | 68% | 2.8 m/s | 5 |
| 2003 | 19.0°C | 12.4°C | 5.8°C | 28.1°C | 0.1°C | 19 mm | 65% | 4 m/s | 5.4 |
| 2002 | 19.8°C | 12.6°C | 5.4°C | 26.8°C | -0.1°C | 22 mm | 61% | 3.8 m/s | 5.4 |
| 2001 | 19.3°C | 12.9°C | 6.5°C | 28.9°C | 0.7°C | 79 mm | 69% | 3.3 m/s | 4.7 |
| 2000 | 20.3°C | 13.8°C | 7.3°C | 29.7°C | 3.7°C | 42 mm | 70% | 3.6 m/s | 5.3 |
| 1999 | 21.5°C | 14.5°C | 7.5°C | 30.4°C | 1.8°C | 28 mm | 60% | 3.3 m/s | 5.1 |
| 1998 | 20.4°C | 13.5°C | 6.7°C | 31.7°C | 2.1°C | 29 mm | 66% | 3.3 m/s | 5.1 |
| 1997 | 18.0°C | 12.1°C | 6.3°C | 21.0°C | 2.8°C | 82 mm | 71% | 2.9 m/s | 4.8 |
| 1996 | 17.5°C | 11.4°C | 5.3°C | 27.7°C | 0.7°C | 68 mm | 69% | 4.2 m/s | 5.3 |
| 1995 | 19.0°C | 12.0°C | 5.0°C | 24.6°C | -1.2°C | 26 mm | 64% | 2.8 m/s | 5.3 |
| 1994 | 18.5°C | 11.3°C | 4.1°C | 25.0°C | -0.8°C | 18 mm | 65% | 3 m/s | 5.7 |
| 1993 | 18.7°C | 12.0°C | 5.4°C | 27.1°C | 0.9°C | 41 mm | 66% | 3 m/s | 5.2 |
| 1992 | 15.1°C | 9.5°C | 3.8°C | 20.2°C | 0.1°C | 100 mm | 77% | 3.2 m/s | 4.7 |
| 1991 | 19.3°C | 12.3°C | 5.3°C | 25.9°C | 1.0°C | 35 mm | 66% | 3.6 m/s | 5.4 |
| 1990 | 19.4°C | 12.3°C | 5.1°C | 30.8°C | 0.6°C | 22 mm | 66% | 3.2 m/s | 5.7 |
| 1989 | 17.6°C | 11.3°C | 5.0°C | 26.7°C | 0.5°C | 24 mm | 71% | 3.4 m/s | 5.6 |
| 1988 | 19.9°C | 13.1°C | 6.3°C | 28.5°C | 1.4°C | 34 mm | 58% | 3.6 m/s | 5.4 |
| 1987 | 19.7°C | 12.7°C | 5.6°C | 30.3°C | -0.8°C | 32 mm | 65% | 2.9 m/s | 5.3 |
| 1986 | 17.1°C | 10.9°C | 4.7°C | 23.6°C | -0.5°C | 33 mm | 73% | 3.2 m/s | 5.4 |
| 1985 | 16.6°C | 10.3°C | 4.0°C | 22.5°C | 0.7°C | 20 mm | 69% | 3.2 m/s | 5.5 |
| 1984 ❄️ | 15.6°C | 9.5°C | 3.3°C | 22.4°C | -0.9°C | 53 mm | 71% | 3.6 m/s | 5.1 |
| 1983 | 19.2°C | 12.2°C | 5.3°C | 26.2°C | 0.7°C | 38 mm | 67% | 3.6 m/s | — |
| 1982 | 19.3°C | 12.0°C | 4.7°C | 29.0°C | -0.5°C | 21 mm | 57% | 3.2 m/s | — |
| 1981 | 20.7°C | 13.5°C | 6.3°C | 30.1°C | 1.5°C | 20 mm | 64% | 3.1 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 19.4°C with lows near 5.7°C (mean 12.5°C), based on 45 years of NASA POWER data.
September averages 35 mm of rainfall in Peterborough, about average for rainfall. The wettest on record was 107 mm in 2016.
The hottest September reached 33.1°C in 2023. The coldest dipped to -1.4°C in 2004.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 2.2°C. Daytime highs moved from 18.3°C to 20.9°C and overnight lows from 4.7°C to 6.4°C over the same span.
September is one of the cooler months of the year in Peterborough and about average for rainfall, so plan for around 19.4°C daytime highs and 5.7°C at night.
Not quite — September is the 5th coolest month in Peterborough, averaging 12.5°C.
For September in Peterborough, pack warm layers and a jacket for chilly mornings, with typical highs of 19.4°C and lows of 5.7°C.
Relative humidity in September averages 64% — moderately humid.
Average wind speed in September is 3.3 m/s. The windiest September on record averaged 4.2 m/s (1996).
The wettest September on record was 2016 with 107 mm. On average, September sees 35 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 Peterborough 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.
