September is one of the warmer months of the year in Peterborough, with average highs near 22.4°C and lows around 10.6°C (mean 16.5°C). It is about average for rainfall, averaging 61 mm of rainfall and 69% relative humidity across the period.
September is one of the warmer months of the year in Peterborough. Across 45 years of records, the warmest September in Peterborough was 2015 — when the month averaged 19.5°C — while the coldest was 1993 at 13.4°C. Typical September days reach 22.4°C with nights near 10.6°C. The long-term trend is warming, about 0.9°C per decade.
September is about average for rainfall in Peterborough, averaging 61 mm of rainfall. The wettest September on record was 1981 with 138 mm, while the driest was 2023 at 6 mm.
Relative humidity in Peterborough during September averages 69%. The most humid September was 1981 at 81%, and the least humid was 2025 at 60%.
September receives about 4 kWh/m²/day of solar energy in Peterborough. The sunniest Septembers were 2004, 2009 and 2023 at 4.6 kWh/m²/day, and the cloudiest was 2006 at 3.2.
Average wind speed in Peterborough during September is 0.5 m/s. The windiest Septembers were 2020, 2021 and 2024, among others at 0.5 m/s, while the calmest were 2022, 2023 and 2025, among others at 0.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 15.3°C | 15.4°C | 16.7°C | 17.6°C | 18.0°C | +2.7°C |
| Avg High | 21.0°C | 21.2°C | 22.8°C | 23.6°C | 24.2°C | +3.2°C |
| Avg Low | 9.6°C | 9.6°C | 10.7°C | 11.5°C | 11.9°C | +2.3°C |
| Avg Rain | 81 mm | 70 mm | 65 mm | 46 mm | 39 mm | -42 mm |
September temperatures in Peterborough have risen by about 3°C between 1981–1985 and 2021–2025.
September has ranged from a record low of -2.1°C (1981) to a record high of 34.9°C (2023).
Rainfall in September is about average for rainfall, averaging 61 mm, with a wettest year of 138 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 1°C per decade while lows rose 0.7°C per decade, widening the gap between day and night.
One of the best times to visit Peterborough
September is one of the best times to visit Peterborough. Expect days averaging 22.4°C and nights around 10.6°C (mean 16.5°C) — warmer than Peterborough's yearly average — with moderate rainfall (61 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 | 24.8°C | 18.4°C | 12.0°C | 28.7°C | 5.9°C | 26 mm | 60% | 0.4 m/s | 4.4 |
| 2024 | 25.7°C | 19.3°C | 12.9°C | 30.8°C | 6.2°C | 62 mm | 68% | 0.5 m/s | 4.2 |
| 2023 | 25.7°C | 19.0°C | 12.3°C | 34.9°C | 5.8°C | 6 mm | 62% | 0.4 m/s | 4.6 |
| 2022 | 22.8°C | 16.9°C | 11.1°C | 30.7°C | 2.7°C | 41 mm | 69% | 0.4 m/s | 3.8 |
| 2021 | 23.6°C | 17.8°C | 12.1°C | 27.6°C | 6.4°C | 68 mm | 66% | 0.5 m/s | 4 |
| 2020 | 22.3°C | 16.5°C | 10.7°C | 27.5°C | 1.6°C | 29 mm | 68% | 0.5 m/s | 4 |
| 2019 | 23.4°C | 17.3°C | 11.2°C | 28.2°C | 6.6°C | 48 mm | 70% | 0.5 m/s | 3.8 |
| 2018 | 24.5°C | 18.5°C | 12.5°C | 32.7°C | 5.3°C | 46 mm | 68% | 0.5 m/s | 4.1 |
| 2017 | 25.6°C | 19.0°C | 12.5°C | 34.5°C | 5.1°C | 36 mm | 66% | 0.4 m/s | 4.4 |
| 2016 | 25.0°C | 18.8°C | 12.6°C | 31.8°C | 4.5°C | 35 mm | 63% | 0.5 m/s | 4.5 |
| 2015 🔥 | 25.5°C | 19.5°C | 13.5°C | 32.3°C | 6.5°C | 66 mm | 68% | 0.5 m/s | 4.2 |
| 2014 | 22.6°C | 16.3°C | 9.9°C | 28.9°C | 1.1°C | 47 mm | 71% | 0.5 m/s | 4.1 |
| 2013 | 22.4°C | 15.9°C | 9.5°C | 32.3°C | 2.5°C | 39 mm | 66% | 0.5 m/s | 4.2 |
| 2012 | 22.1°C | 16.4°C | 10.6°C | 30.2°C | 4.7°C | 37 mm | 65% | 0.5 m/s | 4 |
| 2011 | 23.6°C | 17.8°C | 12.0°C | 32.6°C | 3.3°C | 50 mm | 69% | 0.4 m/s | 3.8 |
| 2010 | 21.5°C | 16.3°C | 11.0°C | 32.4°C | 5.7°C | 53 mm | 70% | 0.5 m/s | 3.4 |
| 2009 | 22.8°C | 16.5°C | 10.1°C | 27.5°C | 3.5°C | 49 mm | 67% | 0.4 m/s | 4.6 |
| 2008 | 22.6°C | 16.4°C | 10.2°C | 31.6°C | 4.0°C | 68 mm | 73% | 0.5 m/s | 3.9 |
| 2007 | 23.6°C | 17.3°C | 11.0°C | 31.1°C | 3.9°C | 47 mm | 66% | 0.5 m/s | 4.5 |
| 2006 | 20.2°C | 15.0°C | 9.8°C | 26.1°C | 3.8°C | 80 mm | 75% | 0.5 m/s | 3.2 |
| 2005 | 25.0°C | 18.6°C | 12.2°C | 31.7°C | 5.4°C | 65 mm | 66% | 0.5 m/s | 4.5 |
| 2004 | 23.2°C | 17.1°C | 11.0°C | 28.8°C | 3.7°C | 66 mm | 74% | 0.5 m/s | 4.6 |
| 2003 | 22.6°C | 16.9°C | 11.3°C | 30.1°C | 4.8°C | 83 mm | 69% | 0.5 m/s | 3.9 |
| 2002 | 25.2°C | 19.0°C | 12.8°C | 34.7°C | 7.2°C | 44 mm | 66% | 0.5 m/s | 4.3 |
| 2001 | 21.7°C | 15.9°C | 10.1°C | 30.3°C | 5.1°C | 75 mm | 70% | 0.5 m/s | 4.1 |
| 2000 | 20.6°C | 14.7°C | 8.7°C | 30.8°C | -1.1°C | 75 mm | 72% | 0.5 m/s | 4 |
| 1999 | 23.5°C | 17.6°C | 11.6°C | 33.7°C | 1.6°C | 84 mm | 69% | 0.5 m/s | 3.9 |
| 1998 | 22.6°C | 16.7°C | 10.8°C | 29.6°C | 3.2°C | 62 mm | 70% | 0.5 m/s | 4.2 |
| 1997 | 20.6°C | 15.0°C | 9.4°C | 27.0°C | 0.7°C | 81 mm | 72% | 0.5 m/s | 3.8 |
| 1996 | 22.3°C | 16.9°C | 11.5°C | 31.8°C | 3.2°C | 78 mm | 70% | 0.5 m/s | 3.5 |
| 1995 | 20.2°C | 13.9°C | 7.6°C | 27.8°C | 2.9°C | 47 mm | 67% | 0.5 m/s | 4.1 |
| 1994 | 21.9°C | 15.9°C | 10.0°C | 29.6°C | 4.0°C | 44 mm | 70% | 0.5 m/s | 3.9 |
| 1993 ❄️ | 18.9°C | 13.4°C | 7.9°C | 28.6°C | 0.0°C | 94 mm | 72% | 0.5 m/s | 3.4 |
| 1992 | 19.9°C | 14.3°C | 8.8°C | 26.1°C | 0.1°C | 101 mm | 76% | 0.5 m/s | 3.8 |
| 1991 | 21.0°C | 15.0°C | 8.9°C | 31.0°C | -2.1°C | 44 mm | 63% | 0.5 m/s | 3.9 |
| 1990 | 20.6°C | 14.9°C | 9.2°C | 27.7°C | 2.2°C | 63 mm | 72% | 0.5 m/s | 3.4 |
| 1989 | 21.9°C | 15.9°C | 10.0°C | 28.5°C | -1.1°C | 81 mm | 69% | 0.5 m/s | 3.9 |
| 1988 | 21.6°C | 15.5°C | 9.4°C | 27.9°C | 3.0°C | 58 mm | 67% | 0.5 m/s | 4.2 |
| 1987 | 21.4°C | 15.9°C | 10.5°C | 28.9°C | 3.4°C | 65 mm | 72% | 0.5 m/s | 3.7 |
| 1986 | 19.4°C | 14.1°C | 8.7°C | 27.6°C | 0.6°C | 131 mm | 77% | 0.5 m/s | 3.5 |
| 1985 | 22.4°C | 16.4°C | 10.3°C | 30.3°C | 3.7°C | 62 mm | 71% | 0.5 m/s | 4 |
| 1984 | 19.6°C | 13.9°C | 8.2°C | 26.2°C | 0.4°C | 79 mm | 72% | 0.5 m/s | 4 |
| 1983 | 23.3°C | 17.1°C | 10.9°C | 31.6°C | 3.5°C | 53 mm | 65% | 0.5 m/s | — |
| 1982 | 21.4°C | 15.2°C | 9.1°C | 30.4°C | 3.2°C | 62 mm | 71% | 0.4 m/s | — |
| 1981 🌧️ | 18.4°C | 13.8°C | 9.3°C | 27.3°C | -2.1°C | 138 mm | 81% | 0.5 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 22.4°C with lows near 10.6°C (mean 16.5°C), based on 45 years of NASA POWER data.
September averages 61 mm of rainfall in Peterborough, about average for rainfall. The wettest on record was 138 mm in 1981.
The hottest September reached 34.9°C in 2023. The coldest dipped to -2.1°C in 1981.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 3°C. Daytime highs moved from 21°C to 24.5°C and overnight lows from 9.6°C to 12.1°C over the same span.
September is one of the warmer months of the year in Peterborough and about average for rainfall, so plan for around 22.4°C daytime highs and 10.6°C at night.
Not quite — September is the 9th coolest month in Peterborough, averaging 16.5°C.
For September in Peterborough, pack light layers you can adjust through the day, with typical highs of 22.4°C and lows of 10.6°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 69% — moderately humid.
Average wind speed in September is 0.5 m/s. The windiest September on record averaged 0.5 m/s (1981).
The wettest September on record was 1981 with 138 mm. On average, September sees 61 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.
