September is one of the warmer months of the year in Oromocto, with average highs near 19.3°C and lows around 9.5°C (mean 14.4°C). It is about average for rainfall, averaging 93 mm of rainfall and 83% relative humidity across the period.
September is one of the warmer months of the year in Oromocto. Across 45 years of records, the warmest September in Oromocto was 1999 — when the month averaged 17.5°C — while the coldest was 1986 at 11.3°C. Typical September days reach 19.3°C with nights near 9.5°C. The long-term trend is warming, about 0.6°C per decade.
September is about average for rainfall in Oromocto, averaging 93 mm of rainfall. The wettest September on record was 1999 with 239 mm, while the driest was 2011 at 28 mm.
Relative humidity in Oromocto during September averages 83%. The most humid September was 2013 at 87%, and the least humid was 2025 at 75%.
September receives about 3.9 kWh/m²/day of solar energy in Oromocto. The sunniest September was 2025 at 4.5 kWh/m²/day, and the cloudiest were 1996, 1997 and 2010, among others at 3.3.
Average wind speed in Oromocto during September is 0.6 m/s. The windiest Septembers were 1988, 1995 and 1996, among others at 0.7 m/s, while the calmest were 2023, 2024 and 2025, among others at 0.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 13.3°C | 13.9°C | 14.4°C | 15.0°C | 15.9°C | +2.6°C |
| Avg High | 18.1°C | 18.7°C | 19.4°C | 19.9°C | 21.1°C | +3°C |
| Avg Low | 8.5°C | 9.0°C | 9.3°C | 10.1°C | 10.8°C | +2.3°C |
| Avg Rain | 88 mm | 110 mm | 86 mm | 96 mm | 77 mm | -11 mm |
September temperatures in Oromocto have risen by about 2.4°C between 1981–1985 and 2021–2025.
September has ranged from a record low of -0.8°C (1989) to a record high of 31.9°C (1999).
Rainfall in September is about average for rainfall, averaging 93 mm, with a wettest year of 239 mm.
One of the best times to visit Oromocto
September is one of the best times to visit Oromocto. Expect days averaging 19.3°C and nights around 9.5°C (mean 14.4°C) — warmer than Oromocto's yearly average — with higher rainfall (93 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 | 22.3°C | 16.2°C | 10.1°C | 27.1°C | 3.8°C | 32 mm | 75% | 0.6 m/s | 4.5 |
| 2024 | 21.5°C | 16.4°C | 11.4°C | 27.9°C | 8.5°C | 41 mm | 82% | 0.6 m/s | 4.2 |
| 2023 | 22.3°C | 17.1°C | 11.9°C | 28.4°C | 5.0°C | 110 mm | 85% | 0.6 m/s | 3.7 |
| 2022 | 20.3°C | 15.4°C | 10.6°C | 28.3°C | 3.3°C | 71 mm | 79% | 0.6 m/s | 3.9 |
| 2021 | 20.3°C | 15.9°C | 11.6°C | 25.0°C | 6.8°C | 148 mm | 84% | 0.6 m/s | 3.6 |
| 2020 | 19.8°C | 14.5°C | 9.3°C | 25.2°C | 1.8°C | 60 mm | 80% | 0.6 m/s | 4 |
| 2019 | 18.4°C | 13.4°C | 8.3°C | 23.9°C | 2.3°C | 129 mm | 84% | 0.6 m/s | 4 |
| 2018 | 20.0°C | 14.7°C | 9.4°C | 26.7°C | 0.6°C | 61 mm | 82% | 0.6 m/s | 4.1 |
| 2017 | 22.0°C | 16.8°C | 11.6°C | 28.4°C | 3.3°C | 58 mm | 83% | 0.6 m/s | 4 |
| 2016 | 20.1°C | 15.1°C | 10.2°C | 27.0°C | 1.9°C | 53 mm | 84% | 0.6 m/s | 4 |
| 2015 | 21.8°C | 16.6°C | 11.3°C | 28.7°C | 3.1°C | 169 mm | 83% | 0.6 m/s | 4.3 |
| 2014 | 19.3°C | 14.2°C | 9.1°C | 26.9°C | 1.6°C | 52 mm | 82% | 0.6 m/s | 4.2 |
| 2013 | 18.4°C | 13.9°C | 9.5°C | 24.8°C | 2.8°C | 123 mm | 87% | 0.6 m/s | 3.5 |
| 2012 | 19.1°C | 14.4°C | 9.7°C | 24.2°C | 3.0°C | 167 mm | 86% | 0.6 m/s | 3.6 |
| 2011 | 20.3°C | 15.7°C | 11.0°C | 25.1°C | 5.0°C | 28 mm | 85% | 0.6 m/s | 3.9 |
| 2010 | 19.3°C | 15.1°C | 10.8°C | 31.1°C | 4.0°C | 121 mm | 86% | 0.6 m/s | 3.3 |
| 2009 | 18.4°C | 13.3°C | 8.1°C | 24.7°C | 0.7°C | 77 mm | 83% | 0.6 m/s | 4.3 |
| 2008 | 18.7°C | 13.9°C | 9.1°C | 25.1°C | 0.9°C | 142 mm | 85% | 0.6 m/s | 3.9 |
| 2007 | 19.5°C | 14.3°C | 9.0°C | 27.7°C | 2.5°C | 70 mm | 80% | 0.6 m/s | 4.3 |
| 2006 | 19.1°C | 14.3°C | 9.4°C | 23.9°C | 4.4°C | 54 mm | 85% | 0.6 m/s | 4.1 |
| 2005 | 19.9°C | 15.2°C | 10.6°C | 25.5°C | 5.4°C | 96 mm | 84% | 0.6 m/s | 4 |
| 2004 | 18.9°C | 13.7°C | 8.5°C | 23.4°C | 4.1°C | 72 mm | 83% | 0.6 m/s | 4.2 |
| 2003 | 21.0°C | 16.0°C | 11.0°C | 27.2°C | 5.5°C | 54 mm | 84% | 0.6 m/s | 4.1 |
| 2002 | 20.0°C | 14.9°C | 9.8°C | 29.6°C | 1.5°C | 138 mm | 84% | 0.6 m/s | 3.7 |
| 2001 | 20.4°C | 15.0°C | 9.7°C | 29.1°C | 3.9°C | 71 mm | 80% | 0.6 m/s | 4.3 |
| 2000 | 18.0°C | 13.0°C | 8.0°C | 27.4°C | -0.3°C | 83 mm | 83% | 0.6 m/s | 3.9 |
| 1999 🔥 🌧️ | 22.6°C | 17.5°C | 12.5°C | 31.9°C | 5.5°C | 239 mm | 84% | 0.6 m/s | 3.8 |
| 1998 | 18.8°C | 14.3°C | 9.7°C | 25.0°C | 4.3°C | 118 mm | 84% | 0.6 m/s | 3.6 |
| 1997 | 18.4°C | 13.7°C | 9.1°C | 23.9°C | 2.3°C | 85 mm | 86% | 0.6 m/s | 3.3 |
| 1996 | 17.9°C | 13.8°C | 9.7°C | 27.5°C | 3.0°C | 139 mm | 85% | 0.7 m/s | 3.3 |
| 1995 | 17.8°C | 12.2°C | 6.5°C | 24.0°C | -0.5°C | 61 mm | 77% | 0.7 m/s | 4.3 |
| 1994 | 17.7°C | 13.0°C | 8.4°C | 22.6°C | 4.5°C | 71 mm | 84% | 0.6 m/s | 3.7 |
| 1993 | 18.7°C | 13.9°C | 9.1°C | 26.4°C | 2.3°C | 101 mm | 83% | 0.6 m/s | 3.8 |
| 1992 | 19.4°C | 14.2°C | 9.0°C | 25.2°C | 0.6°C | 35 mm | 83% | 0.6 m/s | 3.8 |
| 1991 | 17.5°C | 12.7°C | 7.9°C | 25.4°C | 0.6°C | 158 mm | 83% | 0.6 m/s | 3.8 |
| 1990 | 18.3°C | 13.4°C | 8.4°C | 24.9°C | 3.1°C | 91 mm | 85% | 0.6 m/s | 3.3 |
| 1989 | 18.4°C | 13.6°C | 8.7°C | 27.7°C | -0.8°C | 90 mm | 84% | 0.6 m/s | 4 |
| 1988 | 17.4°C | 12.7°C | 7.9°C | 24.2°C | 3.6°C | 66 mm | 82% | 0.7 m/s | 4 |
| 1987 | 17.5°C | 13.4°C | 9.2°C | 25.2°C | 0.2°C | 167 mm | 85% | 0.6 m/s | 3.6 |
| 1986 ❄️ | 16.4°C | 11.3°C | 6.2°C | 23.8°C | 0.9°C | 92 mm | 83% | 0.6 m/s | 3.8 |
| 1985 | 19.4°C | 14.2°C | 9.0°C | 26.7°C | 4.5°C | 47 mm | 82% | 0.6 m/s | 3.9 |
| 1984 | 17.4°C | 12.4°C | 7.4°C | 23.8°C | 1.8°C | 62 mm | 83% | 0.6 m/s | 4.3 |
| 1983 | 20.2°C | 15.1°C | 9.9°C | 28.2°C | 4.0°C | 57 mm | 83% | 0.6 m/s | — |
| 1982 | 18.4°C | 14.1°C | 9.7°C | 24.9°C | 4.5°C | 93 mm | 85% | 0.6 m/s | — |
| 1981 | 17.4°C | 13.1°C | 8.7°C | 23.3°C | 3.9°C | 122 mm | 84% | 0.7 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 19.3°C with lows near 9.5°C (mean 14.4°C), based on 45 years of NASA POWER data.
September averages 93 mm of rainfall in Oromocto, about average for rainfall. The wettest on record was 239 mm in 1999.
The hottest September reached 31.9°C in 1999. The coldest dipped to -0.8°C in 1989.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 2.4°C. Daytime highs moved from 18.6°C to 21.3°C and overnight lows from 8.9°C to 11.1°C over the same span.
September is one of the warmer months of the year in Oromocto and about average for rainfall, so plan for around 19.3°C daytime highs and 9.5°C at night.
Not quite — September is the 9th coolest month in Oromocto, averaging 14.4°C.
For September in Oromocto, pack light layers you can adjust through the day, with typical highs of 19.3°C and lows of 9.5°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 83% — quite humid.
Average wind speed in September is 0.6 m/s. The windiest September on record averaged 0.7 m/s (1981).
The wettest September on record was 1999 with 239 mm. On average, September sees 93 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 Oromocto 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.
