September is one of the warmer months of the year in Edmundston, with average highs near 17.3°C and lows around 6.8°C (mean 12.1°C). It is about average for rainfall, averaging 95 mm of rainfall and 84% relative humidity across the period.
September is one of the warmer months of the year in Edmundston. Across 45 years of records, the warmest September in Edmundston was 1999 — when the month averaged 15.3°C — while the coldest was 1986 at 8.8°C. Typical September days reach 17.3°C with nights near 6.8°C. The long-term trend is warming, about 0.7°C per decade.
September is about average for rainfall in Edmundston, averaging 95 mm of rainfall. The wettest September on record was 2010 with 189 mm, while the driest was 2024 at 38 mm.
Relative humidity in Edmundston during September averages 84%. The most humid Septembers were 1987 and 2010 at 86%, and the least humid was 1995 at 80%.
September receives about 3.6 kWh/m²/day of solar energy in Edmundston. The sunniest September was 2015 at 4.2 kWh/m²/day, and the cloudiest was 1997 at 2.9.
Average wind speed in Edmundston during September is 0 m/s. The windiest Septembers were 2023, 2024 and 2025, among others at 0.1 m/s, while the calmest were 2016, 2019 and 2021, among others at 0 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 10.7°C | 11.4°C | 12.4°C | 12.7°C | 13.4°C | +2.7°C |
| Avg High | 15.9°C | 16.5°C | 17.7°C | 17.8°C | 18.8°C | +2.9°C |
| Avg Low | 5.6°C | 6.2°C | 7.1°C | 7.6°C | 8.0°C | +2.4°C |
| Avg Rain | 86 mm | 99 mm | 99 mm | 106 mm | 81 mm | -5 mm |
September temperatures in Edmundston have risen by about 2.7°C between 1981–1985 and 2021–2025.
September has ranged from a record low of -4°C (1989) to a record high of 29°C (2010).
Rainfall in September is about average for rainfall, averaging 95 mm, with a wettest year of 189 mm.
One of the best times to visit Edmundston
September is one of the best times to visit Edmundston. Expect days averaging 17.3°C and nights around 6.8°C (mean 12.1°C) — warmer than Edmundston's yearly average — with higher rainfall (95 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 | 18.7°C | 12.8°C | 7.0°C | 23.9°C | 1.0°C | 50 mm | 83% | 0.1 m/s | 4 |
| 2024 | 20.0°C | 14.5°C | 9.0°C | 26.2°C | 5.4°C | 38 mm | 84% | 0.1 m/s | 4 |
| 2023 | 20.6°C | 15.1°C | 9.7°C | 28.6°C | 1.2°C | 105 mm | 85% | 0.1 m/s | 3.6 |
| 2022 | 18.3°C | 12.9°C | 7.5°C | 26.3°C | 1.1°C | 74 mm | 81% | 0.1 m/s | 4 |
| 2021 | 18.2°C | 13.4°C | 8.6°C | 24.1°C | 2.9°C | 179 mm | 86% | 0 m/s | 3.5 |
| 2020 | 17.1°C | 11.7°C | 6.2°C | 24.0°C | -1.9°C | 39 mm | 81% | 0.1 m/s | 3.8 |
| 2019 | 15.8°C | 10.8°C | 5.9°C | 23.9°C | -1.4°C | 107 mm | 85% | 0 m/s | 3.3 |
| 2018 | 17.8°C | 12.4°C | 6.9°C | 26.8°C | -3.5°C | 76 mm | 83% | 0.1 m/s | 3.8 |
| 2017 | 19.7°C | 14.3°C | 8.9°C | 27.5°C | -0.2°C | 104 mm | 85% | 0.1 m/s | 3.5 |
| 2016 | 18.5°C | 13.3°C | 8.0°C | 27.1°C | 0.6°C | 90 mm | 84% | 0 m/s | 4 |
| 2015 | 20.2°C | 14.7°C | 9.2°C | 27.3°C | -0.5°C | 84 mm | 83% | 0 m/s | 4.2 |
| 2014 | 16.8°C | 11.7°C | 6.6°C | 25.2°C | -1.9°C | 86 mm | 83% | 0 m/s | 3.6 |
| 2013 | 16.6°C | 11.7°C | 6.9°C | 22.0°C | 1.1°C | 153 mm | 86% | 0 m/s | 3.4 |
| 2012 | 17.7°C | 12.3°C | 6.9°C | 24.8°C | 1.3°C | 71 mm | 84% | 0 m/s | 3.8 |
| 2011 | 18.7°C | 13.5°C | 8.4°C | 23.6°C | 3.7°C | 104 mm | 85% | 0.1 m/s | 3.8 |
| 2010 🌧️ | 16.6°C | 12.4°C | 8.3°C | 29.0°C | 3.5°C | 189 mm | 86% | 0 m/s | 3 |
| 2009 | 17.3°C | 11.8°C | 6.4°C | 23.2°C | -2.2°C | 76 mm | 82% | 0 m/s | 4 |
| 2008 | 17.4°C | 12.1°C | 6.9°C | 24.3°C | -1.2°C | 118 mm | 85% | 0 m/s | 3.5 |
| 2007 | 17.5°C | 12.1°C | 6.8°C | 28.0°C | -0.7°C | 74 mm | 82% | 0 m/s | 3.8 |
| 2006 | 17.0°C | 11.8°C | 6.5°C | 23.2°C | 1.9°C | 98 mm | 85% | 0.1 m/s | 3.6 |
| 2005 | 17.9°C | 12.9°C | 7.9°C | 25.1°C | 2.0°C | 173 mm | 85% | 0 m/s | 3.5 |
| 2004 | 17.3°C | 11.8°C | 6.3°C | 23.8°C | 1.2°C | 72 mm | 84% | 0.1 m/s | 3.9 |
| 2003 | 19.6°C | 14.1°C | 8.6°C | 27.3°C | 3.0°C | 72 mm | 83% | 0.1 m/s | 3.9 |
| 2002 | 18.9°C | 13.3°C | 7.8°C | 28.2°C | -1.1°C | 117 mm | 84% | 0 m/s | 3.8 |
| 2001 | 18.2°C | 13.0°C | 7.9°C | 28.1°C | 0.6°C | 123 mm | 83% | 0 m/s | 3.9 |
| 2000 | 16.2°C | 10.9°C | 5.7°C | 22.7°C | -2.8°C | 62 mm | 82% | 0 m/s | 3.6 |
| 1999 🔥 | 20.1°C | 15.3°C | 10.4°C | 28.3°C | 3.9°C | 182 mm | 86% | 0 m/s | 3.7 |
| 1998 | 16.3°C | 11.8°C | 7.3°C | 21.9°C | 0.7°C | 105 mm | 85% | 0 m/s | 3.3 |
| 1997 | 16.3°C | 11.4°C | 6.6°C | 22.2°C | -1.3°C | 56 mm | 85% | 0 m/s | 2.9 |
| 1996 | 16.9°C | 11.7°C | 6.5°C | 25.3°C | 0.1°C | 72 mm | 83% | 0.1 m/s | 3.6 |
| 1995 | 15.7°C | 9.8°C | 3.8°C | 22.5°C | -2.4°C | 56 mm | 80% | 0.1 m/s | 3.9 |
| 1994 | 15.5°C | 10.7°C | 5.9°C | 22.1°C | 1.2°C | 100 mm | 86% | 0.1 m/s | 3.5 |
| 1993 | 16.1°C | 11.0°C | 5.8°C | 24.3°C | -1.9°C | 136 mm | 83% | 0.1 m/s | 3.4 |
| 1992 | 17.6°C | 11.9°C | 6.2°C | 24.6°C | -3.4°C | 76 mm | 84% | 0 m/s | 3.5 |
| 1991 | 14.9°C | 9.8°C | 4.7°C | 21.9°C | -0.9°C | 103 mm | 82% | 0.1 m/s | 3.6 |
| 1990 | 15.8°C | 10.5°C | 5.2°C | 22.4°C | -0.2°C | 104 mm | 83% | 0 m/s | 3.3 |
| 1989 | 16.9°C | 11.5°C | 6.0°C | 27.4°C | -4.0°C | 103 mm | 83% | 0 m/s | 3.8 |
| 1988 | 15.1°C | 10.2°C | 5.4°C | 22.4°C | 0.5°C | 71 mm | 83% | 0 m/s | 3.5 |
| 1987 | 15.6°C | 11.1°C | 6.6°C | 23.8°C | -2.9°C | 115 mm | 86% | 0 m/s | 3.4 |
| 1986 ❄️ | 13.9°C | 8.8°C | 3.6°C | 21.3°C | -0.9°C | 108 mm | 82% | 0.1 m/s | 3.5 |
| 1985 | 17.0°C | 11.6°C | 6.2°C | 25.5°C | 1.2°C | 78 mm | 83% | 0.1 m/s | 3.7 |
| 1984 | 14.8°C | 9.5°C | 4.2°C | 22.9°C | -1.3°C | 38 mm | 81% | 0 m/s | 3.7 |
| 1983 | 17.8°C | 12.2°C | 6.7°C | 27.3°C | -0.2°C | 94 mm | 84% | 0.1 m/s | — |
| 1982 | 16.0°C | 11.0°C | 6.1°C | 25.7°C | -2.5°C | 92 mm | 86% | 0.1 m/s | — |
| 1981 | 15.6°C | 10.7°C | 5.9°C | 23.8°C | 1.3°C | 72 mm | 85% | 0.1 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 17.3°C with lows near 6.8°C (mean 12.1°C), based on 45 years of NASA POWER data.
September averages 95 mm of rainfall in Edmundston, about average for rainfall. The wettest on record was 189 mm in 2010.
The hottest September reached 29°C in 2010. The coldest dipped to -4°C in 1989.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 2.7°C. Daytime highs moved from 16.2°C to 19.2°C and overnight lows from 5.8°C to 8.4°C over the same span.
September is one of the warmer months of the year in Edmundston and about average for rainfall, so plan for around 17.3°C daytime highs and 6.8°C at night.
Not quite — September is the 9th coolest month in Edmundston, averaging 12.1°C.
For September in Edmundston, pack warm layers and a jacket for chilly mornings, with typical highs of 17.3°C and lows of 6.8°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 84% — quite humid.
Average wind speed in September is 0 m/s. The windiest September on record averaged 0.1 m/s (1981).
The wettest September on record was 2010 with 189 mm. On average, September sees 95 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 Edmundston 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.
