September is one of the warmer months of the year in Newton Aycliffe, with average highs near 15.6°C and lows around 8°C (mean 11.8°C). It is about average for rainfall, averaging 74 mm of rainfall and 88% relative humidity across the period.
September is one of the warmer months of the year in Newton Aycliffe. Across 45 years of records, the warmest September in Newton Aycliffe was 2006 — when the month averaged 14.4°C — while the coldest was 1986 at 9.6°C. Typical September days reach 15.6°C with nights near 8°C. The long-term trend is warming, about 0.3°C per decade.
September is about average for rainfall in Newton Aycliffe, averaging 74 mm of rainfall. The wettest September on record was 2025 with 130 mm, while the driest was 1986 at 19 mm.
Relative humidity in Newton Aycliffe during September averages 88%. The most humid September was 2008 at 90%, and the least humid was 1991 at 84%.
September receives about 2.7 kWh/m²/day of solar energy in Newton Aycliffe. The sunniest Septembers were 2003 and 2004 at 3.1 kWh/m²/day, and the cloudiest was 2000 at 2.
Average wind speed in Newton Aycliffe during September is 3.3 m/s. The windiest September was 1983 at 4.2 m/s, while the calmest was 2014 at 2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 11.2°C | 11.4°C | 12.2°C | 11.8°C | 12.6°C | +1.4°C |
| Avg High | 15.0°C | 15.2°C | 16.0°C | 15.7°C | 16.5°C | +1.5°C |
| Avg Low | 7.5°C | 7.6°C | 8.4°C | 7.9°C | 8.6°C | +1.1°C |
| Avg Rain | 73 mm | 73 mm | 72 mm | 72 mm | 83 mm | +10 mm |
September temperatures in Newton Aycliffe have risen by about 1.2°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 0.7°C (1986) to a record high of 24.8°C (2023).
Rainfall in September is about average for rainfall, averaging 74 mm, with a wettest year of 130 mm.
One of the best times to visit Newton Aycliffe
September is one of the best times to visit Newton Aycliffe. Expect days averaging 15.6°C and nights around 8°C (mean 11.8°C) — warmer than Newton Aycliffe's yearly average — with moderate rainfall (74 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 🌧️ | 15.9°C | 11.9°C | 8.0°C | 19.8°C | 1.3°C | 130 mm | 87% | 3.3 m/s | 3 |
| 2024 | 15.4°C | 11.7°C | 7.9°C | 20.4°C | 2.1°C | 95 mm | 88% | 3.2 m/s | 2.5 |
| 2023 | 18.0°C | 14.1°C | 10.1°C | 24.8°C | 5.8°C | 95 mm | 89% | 3.1 m/s | 2.8 |
| 2022 | 16.2°C | 12.3°C | 8.3°C | 21.8°C | 3.2°C | 81 mm | 88% | 2.8 m/s | 2.8 |
| 2021 | 17.8°C | 13.9°C | 10.0°C | 24.4°C | 5.6°C | 42 mm | 88% | 2.7 m/s | 2.8 |
| 2020 | 15.7°C | 11.6°C | 7.5°C | 22.7°C | 1.1°C | 56 mm | 86% | 3.5 m/s | 2.9 |
| 2019 | 15.6°C | 11.8°C | 8.0°C | 19.8°C | 4.1°C | 103 mm | 88% | 3.3 m/s | 3 |
| 2018 | 15.3°C | 11.3°C | 7.3°C | 21.1°C | 2.1°C | 65 mm | 86% | 3.9 m/s | 2.9 |
| 2017 | 15.1°C | 11.5°C | 8.0°C | 19.9°C | 4.7°C | 98 mm | 89% | 3.3 m/s | 2.7 |
| 2016 | 17.5°C | 13.6°C | 9.8°C | 24.0°C | 6.6°C | 55 mm | 88% | 3.4 m/s | 2.8 |
| 2015 | 15.0°C | 10.6°C | 6.3°C | 18.0°C | 3.6°C | 44 mm | 88% | 2.6 m/s | 2.9 |
| 2014 | 17.4°C | 12.7°C | 8.1°C | 20.6°C | 5.5°C | 25 mm | 88% | 2 m/s | 2.6 |
| 2013 | 15.2°C | 11.4°C | 7.5°C | 20.5°C | 3.4°C | 53 mm | 88% | 3.2 m/s | 2.6 |
| 2012 | 14.2°C | 10.6°C | 7.1°C | 20.5°C | 1.6°C | 116 mm | 89% | 4 m/s | 2.9 |
| 2011 | 16.1°C | 12.5°C | 8.9°C | 23.1°C | 4.2°C | 67 mm | 88% | 4.1 m/s | 2.8 |
| 2010 | 15.6°C | 12.0°C | 8.3°C | 19.4°C | 3.0°C | 95 mm | 87% | 3.6 m/s | 2.8 |
| 2009 | 15.6°C | 12.2°C | 8.7°C | 21.2°C | 5.6°C | 38 mm | 88% | 3.6 m/s | 2.8 |
| 2008 | 15.0°C | 11.6°C | 8.2°C | 17.8°C | 5.8°C | 122 mm | 90% | 2.9 m/s | 2.5 |
| 2007 | 15.4°C | 11.4°C | 7.5°C | 20.8°C | 2.1°C | 53 mm | 88% | 3.6 m/s | 2.9 |
| 2006 🔥 | 18.5°C | 14.4°C | 10.4°C | 23.1°C | 6.3°C | 73 mm | 88% | 3.1 m/s | 3 |
| 2005 | 16.5°C | 12.7°C | 8.8°C | 22.0°C | 3.3°C | 74 mm | 88% | 3.6 m/s | 2.9 |
| 2004 | 15.8°C | 12.2°C | 8.6°C | 22.8°C | 4.5°C | 46 mm | 88% | 4.1 m/s | 3.1 |
| 2003 | 16.3°C | 11.9°C | 7.6°C | 20.8°C | 1.9°C | 71 mm | 87% | 2.4 m/s | 3.1 |
| 2002 | 16.0°C | 11.9°C | 7.8°C | 19.6°C | 4.9°C | 33 mm | 88% | 2.2 m/s | 2.8 |
| 2001 | 14.7°C | 11.3°C | 7.9°C | 19.1°C | 5.7°C | 87 mm | 89% | 3.7 m/s | 2.3 |
| 2000 | 16.0°C | 12.2°C | 8.4°C | 22.0°C | 3.5°C | 124 mm | 90% | 3.1 m/s | 2 |
| 1999 | 17.3°C | 13.3°C | 9.2°C | 23.1°C | 5.3°C | 96 mm | 88% | 3 m/s | 3 |
| 1998 | 15.9°C | 12.5°C | 9.1°C | 21.7°C | 4.8°C | 83 mm | 90% | 3.1 m/s | 2.4 |
| 1997 | 15.2°C | 11.3°C | 7.4°C | 18.3°C | 4.3°C | 32 mm | 87% | 3.3 m/s | 3 |
| 1996 | 15.1°C | 11.4°C | 7.8°C | 22.1°C | 4.2°C | 37 mm | 86% | 3.3 m/s | 2.6 |
| 1995 | 15.2°C | 11.3°C | 7.4°C | 19.5°C | 1.4°C | 104 mm | 88% | 2.9 m/s | 2.7 |
| 1994 | 13.6°C | 10.2°C | 6.8°C | 18.3°C | 3.0°C | 96 mm | 88% | 3.4 m/s | 2.7 |
| 1993 | 13.9°C | 10.3°C | 6.7°C | 21.2°C | 2.2°C | 82 mm | 88% | 3.4 m/s | 2.4 |
| 1992 | 14.7°C | 11.1°C | 7.5°C | 21.1°C | 3.8°C | 102 mm | 88% | 3.7 m/s | 2.6 |
| 1991 | 16.4°C | 11.8°C | 7.3°C | 22.1°C | 3.5°C | 42 mm | 84% | 3.3 m/s | 3 |
| 1990 | 14.5°C | 10.8°C | 7.2°C | 19.2°C | 2.8°C | 56 mm | 84% | 3.5 m/s | 2.7 |
| 1989 | 15.7°C | 11.9°C | 8.1°C | 20.3°C | 4.7°C | 27 mm | 86% | 3.2 m/s | 2.7 |
| 1988 | 14.4°C | 10.9°C | 7.5°C | 22.3°C | 1.1°C | 65 mm | 88% | 4 m/s | 2.5 |
| 1987 | 14.3°C | 10.8°C | 7.3°C | 19.2°C | 0.9°C | 86 mm | 88% | 3.4 m/s | 2.7 |
| 1986 ❄️ | 13.8°C | 9.6°C | 5.3°C | 18.8°C | 0.7°C | 19 mm | 85% | 3 m/s | 3 |
| 1985 | 15.6°C | 11.9°C | 8.2°C | 20.5°C | 3.5°C | 75 mm | 90% | 3.4 m/s | 2.7 |
| 1984 | 14.5°C | 11.0°C | 7.6°C | 20.3°C | 3.0°C | 119 mm | 86% | 3.3 m/s | 2.5 |
| 1983 | 14.3°C | 10.8°C | 7.3°C | 18.9°C | 2.2°C | 91 mm | 88% | 4.2 m/s | — |
| 1982 | 16.1°C | 11.9°C | 7.8°C | 22.1°C | 3.2°C | 72 mm | 87% | 3.6 m/s | — |
| 1981 | 15.9°C | 12.2°C | 8.4°C | 20.2°C | 6.0°C | 104 mm | 87% | 3.5 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 15.6°C with lows near 8°C (mean 11.8°C), based on 45 years of NASA POWER data.
September averages 74 mm of rainfall in Newton Aycliffe, about average for rainfall. The wettest on record was 130 mm in 2025.
The hottest September reached 24.8°C in 2023. The coldest dipped to 0.7°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 15.3°C to 16.7°C and overnight lows from 7.9°C to 8.9°C over the same span.
September is one of the warmer months of the year in Newton Aycliffe and about average for rainfall, so plan for around 15.6°C daytime highs and 8°C at night.
Not quite — September is the 9th coolest month in Newton Aycliffe, averaging 11.8°C.
For September in Newton Aycliffe, pack light layers you can adjust through the day, with typical highs of 15.6°C and lows of 8°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 88% — quite humid.
Average wind speed in September is 3.3 m/s. The windiest September on record averaged 4.2 m/s (1983).
The wettest September on record was 2025 with 130 mm. On average, September sees 74 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 Newton Aycliffe 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.
