September is one of the cooler months of the year in Ipswich, with average highs near 25.4°C and lows around 11°C (mean 18.2°C). It is one of the drier months, averaging 34 mm of rainfall and 63% relative humidity across the period.
September is one of the cooler months of the year in Ipswich. Across 45 years of records, the warmest September in Ipswich was 2017 — when the month averaged 20.9°C — while the coldest was 1984 at 15.5°C. Typical September days reach 25.4°C with nights near 11°C. The long-term trend is warming, about 0.6°C per decade.
September is one of the drier months in Ipswich, averaging 34 mm of rainfall. The wettest September on record was 1998 with 127 mm, while the driest were 2000 and 2017 at 2 mm.
Relative humidity in Ipswich during September averages 63%. The most humid September was 1998 at 80%, and the least humid was 1991 at 43%.
September receives about 5.5 kWh/m²/day of solar energy in Ipswich. The sunniest September was 2003 at 6.2 kWh/m²/day, and the cloudiest was 2010 at 4.2.
Average wind speed in Ipswich during September is 1.2 m/s. The windiest September was 1991 at 1.4 m/s, while the calmest were 2004 and 2025 at 1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 17.1°C | 17.5°C | 18.9°C | 18.6°C | 19.2°C | +2.1°C |
| Avg High | 24.1°C | 24.5°C | 26.3°C | 25.9°C | 26.4°C | +2.3°C |
| Avg Low | 10.1°C | 10.4°C | 11.5°C | 11.4°C | 12.0°C | +1.9°C |
| Avg Rain | 34 mm | 43 mm | 33 mm | 33 mm | 24 mm | -10 mm |
September temperatures in Ipswich have risen by about 2.1°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 1.4°C (1987) to a record high of 38.1°C (2017).
Rainfall in September is one of the drier months, averaging 34 mm, with a wettest year of 127 mm.
A good time to visit Ipswich
September is a good time to visit Ipswich, with days averaging 25.4°C and nights around 11°C (mean 18.2°C, cooler than Ipswich's yearly average) and moderate rainfall. October and November 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 | 26.6°C | 19.3°C | 12.0°C | 34.1°C | 8.0°C | 7 mm | 65% | 1 m/s | 5.6 |
| 2024 | 27.9°C | 20.2°C | 12.6°C | 35.0°C | 8.6°C | 35 mm | 60% | 1.2 m/s | 5.5 |
| 2023 | 27.6°C | 20.0°C | 12.4°C | 35.4°C | 8.7°C | 20 mm | 60% | 1.2 m/s | 5.6 |
| 2022 | 23.8°C | 17.6°C | 11.5°C | 28.4°C | 7.2°C | 55 mm | 70% | 1.1 m/s | 4.7 |
| 2021 | 26.0°C | 18.4°C | 10.9°C | 30.9°C | 6.1°C | 14 mm | 58% | 1.3 m/s | 5.5 |
| 2020 | 26.2°C | 19.4°C | 12.5°C | 32.5°C | 7.0°C | 12 mm | 62% | 1.3 m/s | 5.3 |
| 2019 | 28.4°C | 20.2°C | 12.1°C | 33.3°C | 6.7°C | 9 mm | 48% | 1.3 m/s | 6 |
| 2018 | 25.5°C | 18.6°C | 11.7°C | 31.3°C | 9.0°C | 26 mm | 62% | 1.2 m/s | 5.3 |
| 2017 🔥 | 29.5°C | 20.9°C | 12.3°C | 38.1°C | 6.3°C | 2 mm | 45% | 1.3 m/s | 6.1 |
| 2016 | 24.8°C | 18.2°C | 11.7°C | 28.2°C | 7.2°C | 54 mm | 68% | 1.3 m/s | 4.9 |
| 2015 | 24.2°C | 17.1°C | 10.0°C | 29.7°C | 6.0°C | 42 mm | 67% | 1.2 m/s | 5.4 |
| 2014 | 24.2°C | 17.4°C | 10.6°C | 31.4°C | 5.3°C | 25 mm | 65% | 1.1 m/s | 5.5 |
| 2013 | 28.6°C | 20.6°C | 12.7°C | 37.6°C | 8.8°C | 29 mm | 58% | 1.2 m/s | 5.8 |
| 2012 | 25.9°C | 18.3°C | 10.6°C | 31.8°C | 4.5°C | 17 mm | 63% | 1.1 m/s | 5.6 |
| 2011 | 24.7°C | 17.2°C | 9.8°C | 31.2°C | 4.1°C | 19 mm | 62% | 1.2 m/s | 5.6 |
| 2010 | 23.2°C | 17.9°C | 12.6°C | 27.3°C | 7.9°C | 104 mm | 76% | 1.1 m/s | 4.2 |
| 2009 | 26.1°C | 18.7°C | 11.2°C | 32.7°C | 6.9°C | 67 mm | 62% | 1.2 m/s | 6.1 |
| 2008 | 25.0°C | 18.5°C | 12.0°C | 34.3°C | 7.3°C | 61 mm | 71% | 1.2 m/s | 5.3 |
| 2007 | 24.7°C | 17.8°C | 10.9°C | 31.6°C | 7.4°C | 44 mm | 69% | 1.2 m/s | 5.6 |
| 2006 | 24.0°C | 17.8°C | 11.6°C | 30.9°C | 6.8°C | 62 mm | 73% | 1.2 m/s | 5.3 |
| 2005 | 26.2°C | 18.8°C | 11.4°C | 31.7°C | 5.5°C | 34 mm | 63% | 1.2 m/s | 5.4 |
| 2004 | 26.3°C | 18.5°C | 10.8°C | 33.8°C | 7.4°C | 20 mm | 59% | 1 m/s | 5.7 |
| 2003 | 28.8°C | 20.3°C | 11.8°C | 36.6°C | 7.2°C | 7 mm | 48% | 1.3 m/s | 6.2 |
| 2002 | 27.0°C | 19.2°C | 11.4°C | 34.6°C | 6.8°C | 15 mm | 59% | 1.3 m/s | 5.7 |
| 2001 | 25.3°C | 18.3°C | 11.3°C | 28.8°C | 6.7°C | 19 mm | 63% | 1.3 m/s | 5.1 |
| 2000 | 29.3°C | 20.7°C | 12.1°C | 36.4°C | 7.6°C | 2 mm | 49% | 1.2 m/s | 5.9 |
| 1999 | 22.6°C | 16.9°C | 11.1°C | 27.4°C | 6.5°C | 45 mm | 76% | 1.2 m/s | 5.2 |
| 1998 🌧️ | 22.9°C | 17.9°C | 12.9°C | 28.3°C | 7.3°C | 127 mm | 80% | 1.1 m/s | 4.8 |
| 1997 | 25.5°C | 18.5°C | 11.5°C | 32.6°C | 8.0°C | 54 mm | 63% | 1.3 m/s | 5 |
| 1996 | 25.5°C | 17.3°C | 9.2°C | 32.0°C | 3.0°C | 50 mm | 60% | 1.3 m/s | 5.7 |
| 1995 | 25.9°C | 18.6°C | 11.3°C | 29.8°C | 2.9°C | 33 mm | 62% | 1.2 m/s | 5.3 |
| 1994 | 25.6°C | 17.4°C | 9.2°C | 31.0°C | 4.7°C | 15 mm | 50% | 1.3 m/s | 6 |
| 1993 | 23.2°C | 16.8°C | 10.3°C | 31.6°C | 5.4°C | 47 mm | 68% | 1.2 m/s | 4.9 |
| 1992 | 24.3°C | 16.9°C | 9.4°C | 31.4°C | 5.0°C | 40 mm | 61% | 1.2 m/s | 5.5 |
| 1991 | 27.2°C | 18.8°C | 10.3°C | 32.2°C | 4.0°C | 5 mm | 43% | 1.4 m/s | 6 |
| 1990 | 22.4°C | 15.8°C | 9.2°C | 28.8°C | 5.1°C | 15 mm | 68% | 1.2 m/s | 5.5 |
| 1989 | 23.7°C | 16.2°C | 8.7°C | 29.3°C | 4.9°C | 13 mm | 65% | 1.2 m/s | 6.1 |
| 1988 | 22.9°C | 17.0°C | 11.0°C | 33.5°C | 5.4°C | 55 mm | 76% | 1.2 m/s | 5.1 |
| 1987 | 24.8°C | 17.3°C | 9.8°C | 29.4°C | 1.4°C | 5 mm | 63% | 1.1 m/s | 5.6 |
| 1986 | 25.6°C | 18.2°C | 10.8°C | 33.2°C | 4.5°C | 34 mm | 62% | 1.2 m/s | 5.5 |
| 1985 | 23.2°C | 16.2°C | 9.2°C | 30.0°C | 3.8°C | 42 mm | 65% | 1.2 m/s | 5.5 |
| 1984 ❄️ | 22.8°C | 15.5°C | 8.3°C | 26.8°C | 3.7°C | 41 mm | 63% | 1.3 m/s | 5.8 |
| 1983 | 23.6°C | 17.6°C | 11.7°C | 29.4°C | 7.3°C | 35 mm | 79% | 1.1 m/s | — |
| 1982 | 24.1°C | 17.0°C | 9.9°C | 32.6°C | 5.4°C | 70 mm | 62% | 1.3 m/s | — |
| 1981 | 26.2°C | 18.7°C | 11.2°C | 34.2°C | 2.9°C | 9 mm | 62% | 1.2 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 25.4°C with lows near 11°C (mean 18.2°C), based on 45 years of NASA POWER data.
September averages 34 mm of rainfall in Ipswich, one of the drier months. The wettest on record was 127 mm in 1998.
The hottest September reached 38.1°C in 2017. The coldest dipped to 1.4°C in 1987.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 2.1°C. Daytime highs moved from 24°C to 26.4°C and overnight lows from 10.1°C to 11.9°C over the same span.
September is one of the cooler months of the year in Ipswich and one of the drier months, so plan for around 25.4°C daytime highs and 11°C at night.
Not quite — September is the 5th coolest month in Ipswich, averaging 18.2°C.
For September in Ipswich, pack light layers you can adjust through the day, with typical highs of 25.4°C and lows of 11°C.
Relative humidity in September averages 63% — moderately humid.
Average wind speed in September is 1.2 m/s. The windiest September on record averaged 1.4 m/s (1991).
The wettest September on record was 1998 with 127 mm. On average, September sees 34 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 Ipswich 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.
