September is one of the warmer months of the year in Newry, with average highs near 15.7°C and lows around 10.4°C (mean 13.1°C). It is about average for rainfall, averaging 86 mm of rainfall and 88% relative humidity across the period.
September is one of the warmer months of the year in Newry. Across 45 years of records, the warmest September in Newry was 2023 — when the month averaged 14.9°C — while the coldest was 1986 at 11.2°C. Typical September days reach 15.7°C with nights near 10.4°C. The long-term trend is warming, about 0.3°C per decade.
September is about average for rainfall in Newry, averaging 86 mm of rainfall. The wettest September on record was 1981 with 162 mm, while the driest was 1986 at 10 mm.
Relative humidity in Newry during September averages 88%. The most humid September was 1985 at 90%, and the least humid was 1990 at 84%.
September receives about 2.7 kWh/m²/day of solar energy in Newry. The sunniest September was 1991 at 3.2 kWh/m²/day, and the cloudiest was 2021 at 2.3.
Average wind speed in Newry during September is 4.1 m/s. The windiest September was 2011 at 5.2 m/s, while the calmest was 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 | 12.5°C | 12.8°C | 13.4°C | 13.0°C | 13.8°C | +1.3°C |
| Avg High | 15.1°C | 15.4°C | 16.0°C | 15.6°C | 16.4°C | +1.3°C |
| Avg Low | 9.8°C | 10.2°C | 10.9°C | 10.3°C | 11.1°C | +1.3°C |
| Avg Rain | 90 mm | 75 mm | 76 mm | 86 mm | 111 mm | +21 mm |
September temperatures in Newry have risen by about 1.1°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 5.1°C (1991) to a record high of 22.9°C (2023).
Rainfall in September is about average for rainfall, averaging 86 mm, with a wettest year of 162 mm.
One of the best times to visit Newry
September is one of the best times to visit Newry. Expect days averaging 15.7°C and nights around 10.4°C (mean 13.1°C) — warmer than Newry's yearly average — with higher rainfall (86 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 | 15.7°C | 13.1°C | 10.4°C | 18.1°C | 6.7°C | 120 mm | 87% | 4.4 m/s | 2.6 |
| 2024 | 15.5°C | 12.8°C | 10.1°C | 19.7°C | 5.8°C | 52 mm | 88% | 4.1 m/s | 2.9 |
| 2023 🔥 | 17.5°C | 14.9°C | 12.3°C | 22.9°C | 7.4°C | 155 mm | 89% | 4 m/s | 2.8 |
| 2022 | 16.5°C | 13.9°C | 11.3°C | 18.6°C | 8.2°C | 130 mm | 87% | 4 m/s | 2.8 |
| 2021 | 17.4°C | 14.7°C | 12.1°C | 20.2°C | 7.7°C | 61 mm | 90% | 3.2 m/s | 2.3 |
| 2020 | 15.9°C | 13.2°C | 10.5°C | 20.7°C | 5.5°C | 147 mm | 89% | 4.1 m/s | 2.8 |
| 2019 | 16.0°C | 13.3°C | 10.5°C | 18.9°C | 8.1°C | 127 mm | 88% | 4 m/s | 2.8 |
| 2018 | 15.3°C | 12.3°C | 9.4°C | 19.5°C | 5.3°C | 69 mm | 85% | 4.5 m/s | 2.5 |
| 2017 | 15.4°C | 12.8°C | 10.2°C | 18.8°C | 8.4°C | 127 mm | 88% | 4.5 m/s | 2.5 |
| 2016 | 16.5°C | 13.9°C | 11.3°C | 21.2°C | 6.7°C | 98 mm | 89% | 4.4 m/s | 2.4 |
| 2015 | 14.7°C | 12.1°C | 9.4°C | 16.3°C | 7.6°C | 55 mm | 89% | 3.7 m/s | 2.8 |
| 2014 | 16.6°C | 13.8°C | 11.0°C | 19.2°C | 7.6°C | 13 mm | 89% | 2.6 m/s | 2.8 |
| 2013 | 15.5°C | 13.0°C | 10.4°C | 20.0°C | 7.5°C | 60 mm | 88% | 4 m/s | 2.6 |
| 2012 | 14.8°C | 12.1°C | 9.4°C | 19.3°C | 5.8°C | 93 mm | 87% | 4.7 m/s | 2.7 |
| 2011 | 15.9°C | 13.3°C | 10.8°C | 19.3°C | 7.8°C | 89 mm | 88% | 5.2 m/s | 2.6 |
| 2010 | 15.6°C | 13.3°C | 10.9°C | 18.8°C | 6.8°C | 131 mm | 89% | 4.2 m/s | 2.7 |
| 2009 | 15.6°C | 12.9°C | 10.2°C | 17.3°C | 7.4°C | 46 mm | 88% | 4 m/s | 2.8 |
| 2008 | 15.4°C | 12.9°C | 10.5°C | 17.4°C | 8.8°C | 100 mm | 89% | 3.9 m/s | 2.6 |
| 2007 | 15.8°C | 13.1°C | 10.4°C | 18.9°C | 6.2°C | 54 mm | 88% | 3.9 m/s | 2.7 |
| 2006 | 17.0°C | 14.6°C | 12.1°C | 19.7°C | 8.6°C | 122 mm | 90% | 4.3 m/s | 2.7 |
| 2005 | 16.4°C | 13.7°C | 11.0°C | 19.5°C | 7.9°C | 64 mm | 88% | 4.4 m/s | 2.6 |
| 2004 | 16.0°C | 13.6°C | 11.3°C | 20.5°C | 8.5°C | 91 mm | 88% | 5.1 m/s | 2.7 |
| 2003 | 16.4°C | 13.6°C | 10.8°C | 20.0°C | 7.1°C | 56 mm | 88% | 3.3 m/s | 2.5 |
| 2002 | 15.8°C | 13.4°C | 11.0°C | 17.9°C | 8.7°C | 33 mm | 88% | 3.1 m/s | 2.8 |
| 2001 | 15.5°C | 12.9°C | 10.4°C | 18.9°C | 7.1°C | 60 mm | 88% | 4.3 m/s | 2.6 |
| 2000 | 16.3°C | 13.7°C | 11.2°C | 19.6°C | 7.7°C | 134 mm | 89% | 3.8 m/s | 2.4 |
| 1999 | 16.4°C | 13.8°C | 11.2°C | 21.2°C | 7.0°C | 146 mm | 90% | 4.1 m/s | 2.4 |
| 1998 | 15.9°C | 13.6°C | 11.3°C | 19.2°C | 7.7°C | 80 mm | 90% | 4.2 m/s | 2.7 |
| 1997 | 15.6°C | 13.1°C | 10.6°C | 19.2°C | 7.5°C | 50 mm | 88% | 4.2 m/s | 2.9 |
| 1996 | 15.9°C | 13.2°C | 10.5°C | 20.4°C | 8.5°C | 31 mm | 87% | 3.9 m/s | 3 |
| 1995 | 15.6°C | 12.9°C | 10.3°C | 18.6°C | 7.3°C | 65 mm | 87% | 4 m/s | 2.8 |
| 1994 | 14.5°C | 12.0°C | 9.5°C | 18.0°C | 7.3°C | 78 mm | 88% | 3.7 m/s | 2.9 |
| 1993 | 14.5°C | 12.1°C | 9.7°C | 19.5°C | 6.3°C | 102 mm | 87% | 4.3 m/s | 2.5 |
| 1992 | 14.2°C | 11.7°C | 9.1°C | 17.8°C | 5.2°C | 106 mm | 87% | 4.3 m/s | 2.9 |
| 1991 | 16.4°C | 13.5°C | 10.6°C | 20.6°C | 5.1°C | 53 mm | 86% | 4 m/s | 3.2 |
| 1990 | 15.0°C | 12.3°C | 9.5°C | 19.9°C | 6.5°C | 40 mm | 84% | 4.1 m/s | 2.5 |
| 1989 | 15.5°C | 12.8°C | 10.1°C | 18.5°C | 7.9°C | 56 mm | 87% | 4 m/s | 2.5 |
| 1988 | 14.8°C | 12.3°C | 9.8°C | 18.8°C | 5.5°C | 83 mm | 87% | 4.7 m/s | 2.4 |
| 1987 | 14.7°C | 12.1°C | 9.4°C | 17.0°C | 6.2°C | 101 mm | 86% | 4.4 m/s | 2.8 |
| 1986 ❄️ | 14.3°C | 11.2°C | 8.1°C | 18.1°C | 5.3°C | 10 mm | 85% | 3.5 m/s | 2.9 |
| 1985 | 15.9°C | 13.2°C | 10.6°C | 18.9°C | 6.8°C | 100 mm | 90% | 4 m/s | 2.5 |
| 1984 | 14.9°C | 12.5°C | 10.0°C | 19.4°C | 6.7°C | 107 mm | 86% | 4.3 m/s | 2.6 |
| 1983 | 14.8°C | 12.3°C | 9.8°C | 18.0°C | 6.7°C | 92 mm | 87% | 4.9 m/s | — |
| 1982 | 15.2°C | 12.4°C | 9.6°C | 19.0°C | 5.4°C | 102 mm | 88% | 4.2 m/s | — |
| 1981 🌧️ | 15.8°C | 13.4°C | 11.0°C | 20.1°C | 8.2°C | 162 mm | 88% | 4.5 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 15.7°C with lows near 10.4°C (mean 13.1°C), based on 45 years of NASA POWER data.
September averages 86 mm of rainfall in Newry, about average for rainfall. The wettest on record was 162 mm in 1981.
The hottest September reached 22.9°C in 2023. The coldest dipped to 5.1°C in 1991.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.1°C. Daytime highs moved from 15.3°C to 16.5°C and overnight lows from 10.2°C to 11.2°C over the same span.
September is one of the warmer months of the year in Newry and about average for rainfall, so plan for around 15.7°C daytime highs and 10.4°C at night.
Not quite — September is the 10th coolest month in Newry, averaging 13.1°C.
For September in Newry, pack light layers you can adjust through the day, with typical highs of 15.7°C and lows of 10.4°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 88% — quite humid.
Average wind speed in September is 4.1 m/s. The windiest September on record averaged 5.2 m/s (2011).
The wettest September on record was 1981 with 162 mm. On average, September sees 86 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 Newry 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.
