September is one of the warmer months of the year in Dungannon, with average highs near 15.7°C and lows around 8.8°C (mean 12.3°C). It is about average for rainfall, averaging 89 mm of rainfall and 89% relative humidity across the period.
September is one of the warmer months of the year in Dungannon. Across 45 years of records, the warmest September in Dungannon was 2021 — when the month averaged 14.2°C — while the coldest was 1986 at 10.4°C. Typical September days reach 15.7°C with nights near 8.8°C. The long-term trend is warming, about 0.3°C per decade.
September is about average for rainfall in Dungannon, averaging 89 mm of rainfall. The wettest September on record was 1999 with 167 mm, while the driest was 2014 at 15 mm.
Relative humidity in Dungannon during September averages 89%. The most humid September was 1985 at 91%, and the least humid were 1986 and 1990 at 86%.
September receives about 2.7 kWh/m²/day of solar energy in Dungannon. The sunniest September was 1991 at 3.2 kWh/m²/day, and the cloudiest was 2021 at 2.3.
Average wind speed in Dungannon during September is 3.3 m/s. The windiest September was 2011 at 4.4 m/s, while the calmest was 2014 at 2.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 11.6°C | 12.0°C | 12.7°C | 12.2°C | 13.0°C | +1.4°C |
| Avg High | 15.0°C | 15.5°C | 16.0°C | 15.6°C | 16.5°C | +1.5°C |
| Avg Low | 8.2°C | 8.5°C | 9.3°C | 8.8°C | 9.3°C | +1.1°C |
| Avg Rain | 101 mm | 78 mm | 83 mm | 90 mm | 99 mm | -3 mm |
September temperatures in Dungannon have risen by about 1.2°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 2.2°C (2018) to a record high of 25.1°C (2023).
Rainfall in September is about average for rainfall, averaging 89 mm, with a wettest year of 167 mm.
One of the best times to visit Dungannon
September is one of the best times to visit Dungannon. Expect days averaging 15.7°C and nights around 8.8°C (mean 12.3°C) — warmer than Dungannon's yearly average — with higher rainfall (89 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 | 15.5°C | 12.1°C | 8.6°C | 17.9°C | 3.7°C | 112 mm | 89% | 3.6 m/s | 2.6 |
| 2024 | 15.6°C | 11.9°C | 8.1°C | 21.6°C | 3.7°C | 50 mm | 88% | 3.2 m/s | 2.9 |
| 2023 | 17.7°C | 14.1°C | 10.5°C | 25.1°C | 6.3°C | 136 mm | 90% | 3.2 m/s | 2.8 |
| 2022 | 16.5°C | 13.1°C | 9.6°C | 19.7°C | 6.1°C | 133 mm | 87% | 3.1 m/s | 2.8 |
| 2021 🔥 | 17.9°C | 14.2°C | 10.4°C | 22.7°C | 5.9°C | 73 mm | 90% | 2.6 m/s | 2.3 |
| 2020 | 16.0°C | 12.4°C | 8.8°C | 21.3°C | 2.6°C | 89 mm | 89% | 3.3 m/s | 2.8 |
| 2019 | 15.9°C | 12.5°C | 9.1°C | 19.4°C | 6.5°C | 113 mm | 89% | 3.2 m/s | 2.8 |
| 2018 | 14.8°C | 11.2°C | 7.6°C | 20.0°C | 2.2°C | 71 mm | 87% | 3.6 m/s | 2.5 |
| 2017 | 15.1°C | 11.8°C | 8.6°C | 19.8°C | 5.0°C | 125 mm | 89% | 3.6 m/s | 2.5 |
| 2016 | 16.4°C | 13.2°C | 9.9°C | 21.8°C | 3.9°C | 99 mm | 90% | 3.7 m/s | 2.4 |
| 2015 | 14.8°C | 11.2°C | 7.7°C | 17.6°C | 5.0°C | 59 mm | 90% | 3 m/s | 2.8 |
| 2014 | 17.0°C | 13.1°C | 9.2°C | 20.3°C | 5.7°C | 15 mm | 89% | 2.1 m/s | 2.8 |
| 2013 | 15.7°C | 12.4°C | 9.1°C | 20.7°C | 4.8°C | 61 mm | 88% | 3.4 m/s | 2.6 |
| 2012 | 14.5°C | 11.2°C | 7.9°C | 20.0°C | 3.6°C | 88 mm | 88% | 3.8 m/s | 2.7 |
| 2011 | 15.7°C | 12.5°C | 9.3°C | 21.2°C | 6.4°C | 119 mm | 89% | 4.4 m/s | 2.6 |
| 2010 | 15.6°C | 12.5°C | 9.4°C | 19.8°C | 3.3°C | 145 mm | 90% | 3.5 m/s | 2.7 |
| 2009 | 15.6°C | 12.2°C | 8.8°C | 18.3°C | 4.7°C | 44 mm | 89% | 3.3 m/s | 2.8 |
| 2008 | 15.3°C | 12.0°C | 8.7°C | 18.2°C | 5.2°C | 98 mm | 90% | 3.1 m/s | 2.6 |
| 2007 | 15.6°C | 12.1°C | 8.5°C | 19.7°C | 3.5°C | 59 mm | 89% | 3.2 m/s | 2.7 |
| 2006 | 17.3°C | 13.9°C | 10.4°C | 21.0°C | 5.7°C | 146 mm | 90% | 3.5 m/s | 2.7 |
| 2005 | 16.5°C | 13.1°C | 9.6°C | 21.0°C | 5.0°C | 72 mm | 89% | 3.8 m/s | 2.6 |
| 2004 | 15.9°C | 12.9°C | 9.9°C | 21.2°C | 7.7°C | 101 mm | 89% | 4.2 m/s | 2.7 |
| 2003 | 16.2°C | 12.6°C | 9.1°C | 20.9°C | 4.8°C | 74 mm | 89% | 2.7 m/s | 2.5 |
| 2002 | 16.2°C | 12.7°C | 9.2°C | 19.1°C | 5.2°C | 35 mm | 89% | 2.5 m/s | 2.8 |
| 2001 | 15.6°C | 12.3°C | 9.0°C | 19.6°C | 4.2°C | 64 mm | 89% | 3.5 m/s | 2.6 |
| 2000 | 16.2°C | 12.8°C | 9.4°C | 21.0°C | 4.9°C | 137 mm | 90% | 3.1 m/s | 2.4 |
| 1999 🌧️ | 16.3°C | 12.9°C | 9.4°C | 22.5°C | 4.1°C | 167 mm | 91% | 3.4 m/s | 2.4 |
| 1998 | 16.1°C | 12.9°C | 9.6°C | 21.1°C | 5.6°C | 83 mm | 90% | 3.3 m/s | 2.7 |
| 1997 | 15.7°C | 12.2°C | 8.7°C | 19.7°C | 5.9°C | 57 mm | 88% | 3.4 m/s | 2.9 |
| 1996 | 16.4°C | 12.6°C | 8.8°C | 21.1°C | 5.1°C | 41 mm | 88% | 3.2 m/s | 3 |
| 1995 | 15.5°C | 12.2°C | 9.0°C | 19.7°C | 5.8°C | 72 mm | 88% | 3.1 m/s | 2.8 |
| 1994 | 14.5°C | 11.3°C | 8.1°C | 19.1°C | 5.2°C | 68 mm | 88% | 3 m/s | 2.9 |
| 1993 | 14.6°C | 11.2°C | 7.8°C | 19.5°C | 4.0°C | 86 mm | 88% | 3.3 m/s | 2.5 |
| 1992 | 13.9°C | 10.6°C | 7.3°C | 18.2°C | 3.3°C | 108 mm | 88% | 3.5 m/s | 2.9 |
| 1991 | 16.8°C | 12.9°C | 8.9°C | 22.6°C | 3.4°C | 59 mm | 86% | 3.3 m/s | 3.2 |
| 1990 | 14.7°C | 11.2°C | 7.7°C | 20.6°C | 3.3°C | 42 mm | 86% | 3.3 m/s | 2.5 |
| 1989 | 15.5°C | 11.8°C | 8.1°C | 18.8°C | 5.1°C | 61 mm | 87% | 3.2 m/s | 2.5 |
| 1988 | 14.6°C | 11.5°C | 8.4°C | 20.7°C | 3.0°C | 98 mm | 88% | 3.8 m/s | 2.4 |
| 1987 | 14.5°C | 11.1°C | 7.7°C | 17.8°C | 3.2°C | 97 mm | 88% | 3.7 m/s | 2.8 |
| 1986 ❄️ | 14.6°C | 10.4°C | 6.3°C | 19.0°C | 2.5°C | 18 mm | 86% | 2.9 m/s | 2.9 |
| 1985 | 16.0°C | 12.7°C | 9.4°C | 20.0°C | 5.2°C | 151 mm | 91% | 3.3 m/s | 2.5 |
| 1984 | 14.6°C | 11.5°C | 8.4°C | 20.5°C | 4.0°C | 114 mm | 87% | 3.4 m/s | 2.6 |
| 1983 | 14.8°C | 11.5°C | 8.3°C | 19.0°C | 3.3°C | 101 mm | 88% | 4.1 m/s | — |
| 1982 | 15.0°C | 11.4°C | 7.8°C | 21.1°C | 2.7°C | 110 mm | 89% | 3.6 m/s | — |
| 1981 | 15.6°C | 12.4°C | 9.2°C | 21.8°C | 6.4°C | 164 mm | 90% | 3.6 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 8.8°C (mean 12.3°C), based on 45 years of NASA POWER data.
September averages 89 mm of rainfall in Dungannon, about average for rainfall. The wettest on record was 167 mm in 1999.
The hottest September reached 25.1°C in 2023. The coldest dipped to 2.2°C in 2018.
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 15.2°C to 16.6°C and overnight lows from 8.6°C to 9.4°C over the same span.
September is one of the warmer months of the year in Dungannon and about average for rainfall, so plan for around 15.7°C daytime highs and 8.8°C at night.
Not quite — September is the 9th coolest month in Dungannon, averaging 12.3°C.
For September in Dungannon, pack light layers you can adjust through the day, with typical highs of 15.7°C and lows of 8.8°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 89% — quite humid.
Average wind speed in September is 3.3 m/s. The windiest September on record averaged 4.4 m/s (2011).
The wettest September on record was 1999 with 167 mm. On average, September sees 89 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 Dungannon 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.
