September is one of the warmer months of the year in Halewood, with average highs near 16.5°C and lows around 11.1°C (mean 13.8°C). It is about average for rainfall, averaging 82 mm of rainfall and 85% relative humidity across the period.
September is one of the warmer months of the year in Halewood. Across 45 years of records, the warmest September in Halewood was 2023 — when the month averaged 16.1°C — while the coldest was 1986 at 11.4°C. Typical September days reach 16.5°C with nights near 11.1°C. The long-term trend is warming, about 0.3°C per decade.
September is about average for rainfall in Halewood, averaging 82 mm of rainfall. The wettest September on record was 2025 with 157 mm, while the driest was 1986 at 14 mm.
Relative humidity in Halewood during September averages 85%. The most humid September was 1998 at 88%, and the least humid was 1991 at 81%.
September receives about 2.9 kWh/m²/day of solar energy in Halewood. The sunniest Septembers were 1986 and 1991 at 3.4 kWh/m²/day, and the cloudiest were 1993 and 2000 at 2.5.
Average wind speed in Halewood during September is 3.9 m/s. The windiest September was 1983 at 4.9 m/s, while the calmest was 2014 at 2.5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 13.3°C | 13.4°C | 14.1°C | 13.8°C | 14.6°C | +1.3°C |
| Avg High | 15.8°C | 16.2°C | 16.8°C | 16.4°C | 17.5°C | +1.7°C |
| Avg Low | 10.7°C | 10.6°C | 11.4°C | 11.1°C | 11.8°C | +1.1°C |
| Avg Rain | 75 mm | 74 mm | 82 mm | 86 mm | 100 mm | +25 mm |
September temperatures in Halewood have risen by about 1.2°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 5.6°C (1986) to a record high of 24.2°C (2021).
Rainfall in September is about average for rainfall, averaging 82 mm, with a wettest year of 157 mm.
One of the best times to visit Halewood
September is one of the best times to visit Halewood. Expect days averaging 16.5°C and nights around 11.1°C (mean 13.8°C) — warmer than Halewood's yearly average — with higher rainfall (82 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 🌧️ | 16.8°C | 14.0°C | 11.1°C | 20.1°C | 7.0°C | 157 mm | 84% | 4.1 m/s | 2.8 |
| 2024 | 16.4°C | 13.7°C | 11.1°C | 22.4°C | 8.3°C | 113 mm | 86% | 3.9 m/s | 2.7 |
| 2023 🔥 | 19.1°C | 16.1°C | 13.1°C | 24.2°C | 9.0°C | 110 mm | 86% | 3.6 m/s | 2.8 |
| 2022 | 17.3°C | 14.6°C | 11.8°C | 20.9°C | 8.6°C | 98 mm | 84% | 3.8 m/s | 3 |
| 2021 | 18.7°C | 15.7°C | 12.7°C | 24.2°C | 10.1°C | 68 mm | 87% | 3 m/s | 2.8 |
| 2020 | 16.7°C | 13.7°C | 10.8°C | 21.6°C | 6.0°C | 57 mm | 84% | 3.8 m/s | 3.1 |
| 2019 | 16.5°C | 14.0°C | 11.5°C | 19.9°C | 8.2°C | 125 mm | 85% | 3.9 m/s | 2.9 |
| 2018 | 16.1°C | 13.5°C | 10.8°C | 21.0°C | 6.5°C | 83 mm | 83% | 4.3 m/s | 2.8 |
| 2017 | 15.9°C | 13.4°C | 11.0°C | 20.2°C | 8.3°C | 122 mm | 87% | 4.1 m/s | 2.7 |
| 2016 | 18.0°C | 15.3°C | 12.6°C | 23.1°C | 10.1°C | 69 mm | 86% | 3.9 m/s | 2.9 |
| 2015 | 15.6°C | 12.7°C | 9.7°C | 18.8°C | 7.8°C | 52 mm | 84% | 3.3 m/s | 3.3 |
| 2014 | 17.9°C | 14.6°C | 11.3°C | 19.9°C | 8.8°C | 14 mm | 85% | 2.5 m/s | 3.1 |
| 2013 | 16.1°C | 13.4°C | 10.7°C | 20.7°C | 8.5°C | 62 mm | 86% | 3.8 m/s | 2.6 |
| 2012 | 15.0°C | 12.6°C | 10.2°C | 20.0°C | 5.7°C | 140 mm | 86% | 4.4 m/s | 2.8 |
| 2011 | 16.9°C | 14.4°C | 11.9°C | 22.0°C | 10.0°C | 88 mm | 85% | 4.6 m/s | 2.8 |
| 2010 | 16.4°C | 13.7°C | 11.1°C | 19.9°C | 5.7°C | 103 mm | 85% | 4.2 m/s | 2.8 |
| 2009 | 16.4°C | 13.8°C | 11.2°C | 21.0°C | 7.7°C | 44 mm | 86% | 3.8 m/s | 2.8 |
| 2008 | 16.2°C | 13.5°C | 10.8°C | 19.0°C | 8.3°C | 110 mm | 87% | 3.6 m/s | 2.6 |
| 2007 | 16.0°C | 13.6°C | 11.1°C | 18.7°C | 6.1°C | 72 mm | 87% | 4.1 m/s | 2.9 |
| 2006 | 18.8°C | 15.8°C | 12.8°C | 23.0°C | 9.0°C | 71 mm | 86% | 3.9 m/s | 3.1 |
| 2005 | 17.4°C | 14.7°C | 11.9°C | 22.7°C | 8.5°C | 84 mm | 85% | 3.9 m/s | 2.9 |
| 2004 | 16.8°C | 14.2°C | 11.7°C | 21.5°C | 8.3°C | 86 mm | 86% | 4.8 m/s | 3.1 |
| 2003 | 17.1°C | 14.1°C | 11.2°C | 21.0°C | 8.6°C | 88 mm | 85% | 2.8 m/s | 3 |
| 2002 | 17.0°C | 14.0°C | 11.1°C | 20.2°C | 8.1°C | 47 mm | 84% | 2.7 m/s | 3.1 |
| 2001 | 15.6°C | 13.1°C | 10.6°C | 18.6°C | 7.7°C | 80 mm | 87% | 4.4 m/s | 2.6 |
| 2000 | 16.9°C | 14.2°C | 11.6°C | 22.5°C | 7.0°C | 140 mm | 87% | 3.7 m/s | 2.5 |
| 1999 | 17.8°C | 14.9°C | 11.9°C | 22.7°C | 9.4°C | 106 mm | 86% | 3.6 m/s | 3 |
| 1998 | 16.7°C | 14.0°C | 11.3°C | 21.7°C | 7.5°C | 80 mm | 88% | 3.9 m/s | 3 |
| 1997 | 16.4°C | 13.7°C | 11.0°C | 19.0°C | 8.3°C | 43 mm | 85% | 4.2 m/s | 2.9 |
| 1996 | 16.6°C | 13.4°C | 10.3°C | 20.3°C | 7.4°C | 28 mm | 83% | 3.8 m/s | 3 |
| 1995 | 15.9°C | 13.4°C | 10.9°C | 19.2°C | 7.8°C | 95 mm | 84% | 3.6 m/s | 3 |
| 1994 | 14.5°C | 12.1°C | 9.7°C | 17.7°C | 7.2°C | 118 mm | 86% | 4.1 m/s | 2.8 |
| 1993 | 15.2°C | 12.3°C | 9.3°C | 19.1°C | 5.7°C | 78 mm | 85% | 4.1 m/s | 2.5 |
| 1992 | 15.5°C | 12.9°C | 10.3°C | 20.5°C | 8.2°C | 78 mm | 85% | 4.4 m/s | 3 |
| 1991 | 17.7°C | 14.3°C | 10.8°C | 23.2°C | 6.7°C | 47 mm | 81% | 3.7 m/s | 3.4 |
| 1990 | 15.2°C | 12.8°C | 10.4°C | 19.7°C | 7.7°C | 68 mm | 82% | 4.2 m/s | 2.8 |
| 1989 | 16.7°C | 14.0°C | 11.2°C | 20.3°C | 9.6°C | 25 mm | 84% | 3.6 m/s | 2.8 |
| 1988 | 15.0°C | 12.8°C | 10.6°C | 22.2°C | 6.6°C | 74 mm | 85% | 4.6 m/s | 2.6 |
| 1987 | 15.5°C | 13.0°C | 10.5°C | 19.2°C | 7.2°C | 84 mm | 85% | 4 m/s | 3.1 |
| 1986 ❄️ | 14.3°C | 11.4°C | 8.5°C | 18.3°C | 5.6°C | 14 mm | 83% | 3.2 m/s | 3.4 |
| 1985 | 16.5°C | 13.9°C | 11.3°C | 20.3°C | 8.5°C | 64 mm | 87% | 3.9 m/s | 2.7 |
| 1984 | 15.4°C | 13.3°C | 11.2°C | 21.1°C | 8.0°C | 129 mm | 83% | 4.3 m/s | 2.7 |
| 1983 | 15.6°C | 13.2°C | 10.8°C | 18.6°C | 8.3°C | 99 mm | 85% | 4.9 m/s | — |
| 1982 | 16.7°C | 13.7°C | 10.7°C | 22.2°C | 6.7°C | 83 mm | 85% | 3.7 m/s | — |
| 1981 | 16.8°C | 14.0°C | 11.3°C | 20.7°C | 8.9°C | 109 mm | 84% | 4 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 16.5°C with lows near 11.1°C (mean 13.8°C), based on 45 years of NASA POWER data.
September averages 82 mm of rainfall in Halewood, about average for rainfall. The wettest on record was 157 mm in 2025.
The hottest September reached 24.2°C in 2021. The coldest dipped to 5.6°C in 1986.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.2°C. Daytime highs moved from 16.2°C to 17.7°C and overnight lows from 11.1°C to 12°C over the same span.
September is one of the warmer months of the year in Halewood and about average for rainfall, so plan for around 16.5°C daytime highs and 11.1°C at night.
Not quite — September is the 10th coolest month in Halewood, averaging 13.8°C.
For September in Halewood, pack light layers you can adjust through the day, with typical highs of 16.5°C and lows of 11.1°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 85% — quite humid.
Average wind speed in September is 3.9 m/s. The windiest September on record averaged 4.9 m/s (1983).
The wettest September on record was 2025 with 157 mm. On average, September sees 82 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 Halewood 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.
