September is one of the warmer months of the year in Chichester, with average highs near 19.5°C and lows around 11.4°C (mean 15.5°C). It is about average for rainfall, averaging 60 mm of rainfall and 81% relative humidity across the period.
September is one of the warmer months of the year in Chichester. Across 45 years of records, the warmest September in Chichester was 2023 — when the month averaged 18.8°C — while the coldest was 1986 at 12.5°C. Typical September days reach 19.5°C with nights near 11.4°C. The long-term trend is warming, about 0.3°C per decade.
September is about average for rainfall in Chichester, averaging 60 mm of rainfall. The wettest September on record was 2024 with 130 mm, while the driest was 2003 at 13 mm.
Relative humidity in Chichester during September averages 81%. The most humid September was 1992 at 86%, and the least humid was 1990 at 73%.
September receives about 3.5 kWh/m²/day of solar energy in Chichester. The sunniest Septembers were 1997, 2003 and 2015 at 3.9 kWh/m²/day, and the cloudiest was 2000 at 2.9.
Average wind speed in Chichester during September is 3.6 m/s. The windiest September was 1983 at 4.5 m/s, while the calmest were 2003 and 2014 at 2.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 15.0°C | 14.9°C | 15.7°C | 15.3°C | 16.6°C | +1.6°C |
| Avg High | 19.1°C | 18.8°C | 19.7°C | 19.4°C | 20.8°C | +1.7°C |
| Avg Low | 11.0°C | 11.0°C | 11.6°C | 11.2°C | 12.4°C | +1.4°C |
| Avg Rain | 58 mm | 77 mm | 49 mm | 51 mm | 66 mm | +8 mm |
September temperatures in Chichester have risen by about 1.4°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 5.1°C (1987) to a record high of 30.7°C (2023).
Rainfall in September is about average for rainfall, averaging 60 mm, with a wettest year of 130 mm.
One of the best times to visit Chichester
September is one of the best times to visit Chichester. Expect days averaging 19.5°C and nights around 11.4°C (mean 15.5°C) — warmer than Chichester's yearly average — with moderate rainfall (60 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 | 19.7°C | 15.6°C | 11.5°C | 24.0°C | 6.3°C | 53 mm | 78% | 4.4 m/s | 3.5 |
| 2024 🌧️ | 19.6°C | 15.8°C | 11.9°C | 27.1°C | 6.0°C | 130 mm | 83% | 3.8 m/s | 3.1 |
| 2023 🔥 | 23.0°C | 18.8°C | 14.5°C | 30.7°C | 8.9°C | 49 mm | 80% | 3.2 m/s | 3.6 |
| 2022 | 20.1°C | 16.1°C | 12.0°C | 25.0°C | 6.2°C | 77 mm | 78% | 3.3 m/s | 3.4 |
| 2021 | 21.6°C | 17.3°C | 12.9°C | 27.4°C | 7.7°C | 45 mm | 81% | 3.2 m/s | 3.7 |
| 2020 | 20.7°C | 16.0°C | 11.3°C | 26.5°C | 6.2°C | 40 mm | 77% | 3.8 m/s | 3.6 |
| 2019 | 19.9°C | 15.6°C | 11.4°C | 24.5°C | 7.2°C | 85 mm | 79% | 4.1 m/s | 3.6 |
| 2018 | 19.6°C | 15.3°C | 11.0°C | 23.0°C | 5.8°C | 41 mm | 77% | 3.6 m/s | 3.7 |
| 2017 | 18.2°C | 14.5°C | 10.7°C | 21.8°C | 7.1°C | 70 mm | 83% | 3.7 m/s | 3.2 |
| 2016 | 20.9°C | 17.0°C | 13.1°C | 25.9°C | 8.5°C | 41 mm | 81% | 3.6 m/s | 3.4 |
| 2015 | 17.5°C | 13.5°C | 9.6°C | 20.2°C | 6.8°C | 56 mm | 83% | 3.5 m/s | 3.9 |
| 2014 | 21.2°C | 16.8°C | 12.3°C | 23.5°C | 7.2°C | 14 mm | 81% | 2.6 m/s | 3.6 |
| 2013 | 19.4°C | 15.2°C | 11.0°C | 27.8°C | 7.2°C | 49 mm | 82% | 3.2 m/s | 3.3 |
| 2012 | 18.4°C | 14.2°C | 10.0°C | 24.5°C | 6.1°C | 57 mm | 81% | 3.5 m/s | 3.7 |
| 2011 | 20.1°C | 16.2°C | 12.3°C | 24.6°C | 8.8°C | 40 mm | 82% | 4.2 m/s | 3.5 |
| 2010 | 18.4°C | 14.5°C | 10.6°C | 21.2°C | 5.3°C | 55 mm | 83% | 3.7 m/s | 3.5 |
| 2009 | 19.9°C | 15.7°C | 11.5°C | 23.5°C | 8.7°C | 29 mm | 79% | 3.8 m/s | 3.7 |
| 2008 | 18.1°C | 14.4°C | 10.8°C | 19.9°C | 7.8°C | 65 mm | 82% | 3.8 m/s | 3.4 |
| 2007 | 19.3°C | 15.1°C | 10.9°C | 24.3°C | 6.8°C | 28 mm | 81% | 3.5 m/s | 3.7 |
| 2006 | 21.7°C | 17.8°C | 13.9°C | 25.3°C | 10.1°C | 85 mm | 82% | 3.6 m/s | 3.5 |
| 2005 | 20.6°C | 16.4°C | 12.3°C | 25.9°C | 5.9°C | 37 mm | 81% | 3.2 m/s | 3.5 |
| 2004 | 20.1°C | 15.9°C | 11.7°C | 26.2°C | 6.5°C | 27 mm | 80% | 4.3 m/s | 3.5 |
| 2003 | 20.5°C | 15.8°C | 11.0°C | 24.6°C | 5.6°C | 13 mm | 75% | 2.6 m/s | 3.9 |
| 2002 | 19.6°C | 15.5°C | 11.4°C | 22.9°C | 8.4°C | 32 mm | 79% | 3.4 m/s | 3.8 |
| 2001 | 18.1°C | 14.3°C | 10.4°C | 21.3°C | 7.8°C | 61 mm | 81% | 4.1 m/s | 3.4 |
| 2000 | 19.2°C | 15.7°C | 12.2°C | 24.9°C | 9.0°C | 117 mm | 85% | 3.8 m/s | 2.9 |
| 1999 | 20.2°C | 16.7°C | 13.2°C | 25.2°C | 11.0°C | 110 mm | 84% | 3.7 m/s | 3.4 |
| 1998 | 19.4°C | 15.8°C | 12.1°C | 23.6°C | 7.5°C | 116 mm | 84% | 4 m/s | 3.4 |
| 1997 | 19.7°C | 15.5°C | 11.3°C | 23.1°C | 7.2°C | 15 mm | 82% | 3.2 m/s | 3.9 |
| 1996 | 18.5°C | 14.4°C | 10.4°C | 21.4°C | 7.1°C | 34 mm | 78% | 3.8 m/s | 3.5 |
| 1995 | 18.3°C | 14.5°C | 10.7°C | 22.2°C | 6.1°C | 128 mm | 81% | 3.8 m/s | 3.2 |
| 1994 | 17.4°C | 13.9°C | 10.4°C | 21.3°C | 6.7°C | 87 mm | 83% | 3.9 m/s | 3.3 |
| 1993 | 17.0°C | 13.3°C | 9.7°C | 23.1°C | 5.6°C | 106 mm | 83% | 3.5 m/s | 3.1 |
| 1992 | 17.8°C | 14.2°C | 10.6°C | 20.9°C | 7.4°C | 92 mm | 86% | 3.8 m/s | 3.3 |
| 1991 | 20.8°C | 16.3°C | 11.7°C | 26.3°C | 6.8°C | 50 mm | 77% | 3.2 m/s | 3.6 |
| 1990 | 19.3°C | 14.7°C | 10.1°C | 24.4°C | 7.4°C | 35 mm | 73% | 3.5 m/s | 3.5 |
| 1989 | 20.6°C | 16.5°C | 12.3°C | 24.5°C | 8.6°C | 34 mm | 77% | 3.6 m/s | 3.4 |
| 1988 | 18.5°C | 14.6°C | 10.7°C | 23.0°C | 5.1°C | 58 mm | 81% | 4.1 m/s | 3.1 |
| 1987 | 19.0°C | 15.1°C | 11.1°C | 24.5°C | 5.1°C | 47 mm | 82% | 3.3 m/s | 3.1 |
| 1986 ❄️ | 16.9°C | 12.5°C | 8.2°C | 20.0°C | 5.6°C | 38 mm | 80% | 3.1 m/s | 3.2 |
| 1985 | 19.5°C | 15.3°C | 11.2°C | 23.8°C | 7.2°C | 23 mm | 82% | 3.3 m/s | 3.4 |
| 1984 | 18.6°C | 14.8°C | 11.0°C | 23.7°C | 7.6°C | 67 mm | 78% | 4 m/s | 3.1 |
| 1983 | 18.8°C | 15.0°C | 11.2°C | 24.9°C | 7.2°C | 69 mm | 81% | 4.5 m/s | — |
| 1982 | 20.4°C | 16.0°C | 11.6°C | 26.8°C | 7.4°C | 62 mm | 81% | 3.2 m/s | — |
| 1981 | 19.2°C | 15.6°C | 11.9°C | 23.3°C | 7.8°C | 122 mm | 80% | 3.8 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 19.5°C with lows near 11.4°C (mean 15.5°C), based on 45 years of NASA POWER data.
September averages 60 mm of rainfall in Chichester, about average for rainfall. The wettest on record was 130 mm in 2024.
The hottest September reached 30.7°C in 2023. The coldest dipped to 5.1°C in 1987.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.4°C. Daytime highs moved from 19.3°C to 20.8°C and overnight lows from 11.4°C to 12.6°C over the same span.
September is one of the warmer months of the year in Chichester and about average for rainfall, so plan for around 19.5°C daytime highs and 11.4°C at night.
Not quite — September is the 10th coolest month in Chichester, averaging 15.5°C.
For September in Chichester, pack light layers you can adjust through the day, with typical highs of 19.5°C and lows of 11.4°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 81% — quite humid.
Average wind speed in September is 3.6 m/s. The windiest September on record averaged 4.5 m/s (1983).
The wettest September on record was 2024 with 130 mm. On average, September sees 60 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 Chichester 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.
