September is one of the warmer months of the year in Conception Bay South, with average highs near 16.5°C and lows around 9.3°C (mean 12.9°C). It is about average for rainfall, averaging 106 mm of rainfall and 86% relative humidity across the period.
September is one of the warmer months of the year in Conception Bay South. Across 45 years of records, the warmest Septembers in Conception Bay South were 2012 and 2022 — when the month averaged 14.8°C — while the coldest was 1986 at 10.6°C. Typical September days reach 16.5°C with nights near 9.3°C. The long-term trend is warming, about 0.4°C per decade.
September is about average for rainfall in Conception Bay South, averaging 106 mm of rainfall. The wettest September on record was 2001 with 208 mm, while the driest was 2011 at 46 mm.
Relative humidity in Conception Bay South during September averages 86%. The most humid September was 1997 at 89%, and the least humid was 1989 at 83%.
September receives about 3.4 kWh/m²/day of solar energy in Conception Bay South. The sunniest Septembers were 1988 and 2012 at 3.8 kWh/m²/day, and the cloudiest were 1991, 1997 and 1998 at 3.
Average wind speed in Conception Bay South during September is 1.6 m/s. The windiest Septembers were 1981 and 2022 at 1.9 m/s, while the calmest were 2003, 2023 and 2025, among others at 1.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 12.1°C | 12.6°C | 13.0°C | 13.1°C | 14.2°C | +2.1°C |
| Avg High | 15.6°C | 16.1°C | 16.6°C | 16.7°C | 17.7°C | +2.1°C |
| Avg Low | 8.6°C | 9.0°C | 9.4°C | 9.5°C | 10.6°C | +2°C |
| Avg Rain | 114 mm | 97 mm | 109 mm | 112 mm | 92 mm | -22 mm |
September temperatures in Conception Bay South have risen by about 1.9°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 1.4°C (2015) to a record high of 27.5°C (2001).
Rainfall in September is about average for rainfall, averaging 106 mm, with a wettest year of 208 mm.
One of the best times to visit Conception Bay South
September is one of the best times to visit Conception Bay South. Expect days averaging 16.5°C and nights around 9.3°C (mean 12.9°C) — warmer than Conception Bay South's yearly average — with higher rainfall (106 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 | 17.0°C | 13.2°C | 9.5°C | 22.8°C | 5.3°C | 52 mm | 86% | 1.4 m/s | 3.6 |
| 2024 | 17.3°C | 14.0°C | 10.8°C | 23.8°C | 6.2°C | 70 mm | 88% | 1.6 m/s | 3.4 |
| 2023 | 18.3°C | 14.5°C | 10.8°C | 24.6°C | 3.6°C | 86 mm | 87% | 1.4 m/s | 3.3 |
| 2022 | 17.7°C | 14.8°C | 11.9°C | 26.2°C | 7.5°C | 141 mm | 87% | 1.9 m/s | 3.2 |
| 2021 | 18.2°C | 14.3°C | 10.4°C | 22.4°C | 4.9°C | 115 mm | 87% | 1.5 m/s | 3.6 |
| 2020 | 17.9°C | 14.1°C | 10.4°C | 23.9°C | 4.4°C | 90 mm | 85% | 1.6 m/s | 3.7 |
| 2019 | 15.4°C | 11.9°C | 8.4°C | 22.9°C | 3.9°C | 121 mm | 86% | 1.7 m/s | 3.4 |
| 2018 | 15.6°C | 11.9°C | 8.3°C | 23.2°C | 1.6°C | 122 mm | 85% | 1.5 m/s | 3.4 |
| 2017 | 16.7°C | 13.3°C | 9.8°C | 23.4°C | 3.5°C | 171 mm | 87% | 1.6 m/s | 3.2 |
| 2016 | 15.6°C | 12.1°C | 8.5°C | 23.8°C | 4.6°C | 108 mm | 86% | 1.7 m/s | 3.4 |
| 2015 | 16.8°C | 12.9°C | 8.9°C | 23.5°C | 1.4°C | 117 mm | 87% | 1.6 m/s | 3.2 |
| 2014 | 16.8°C | 13.1°C | 9.4°C | 21.6°C | 4.2°C | 61 mm | 85% | 1.7 m/s | 3.7 |
| 2013 | 17.8°C | 14.2°C | 10.5°C | 23.4°C | 3.2°C | 135 mm | 88% | 1.6 m/s | 3.2 |
| 2012 🔥 | 18.6°C | 14.8°C | 11.0°C | 22.5°C | 6.5°C | 88 mm | 86% | 1.5 m/s | 3.8 |
| 2011 | 16.9°C | 13.2°C | 9.5°C | 23.3°C | 4.7°C | 46 mm | 87% | 1.6 m/s | 3.6 |
| 2010 | 16.7°C | 13.5°C | 10.2°C | 22.5°C | 2.6°C | 150 mm | 86% | 1.7 m/s | 3.1 |
| 2009 | 15.0°C | 11.5°C | 7.9°C | 20.4°C | 2.0°C | 87 mm | 86% | 1.8 m/s | 3.6 |
| 2008 | 17.0°C | 13.4°C | 9.8°C | 24.8°C | 2.2°C | 85 mm | 86% | 1.5 m/s | 3.5 |
| 2007 | 16.4°C | 12.5°C | 8.7°C | 20.9°C | 4.5°C | 78 mm | 85% | 1.6 m/s | 3.5 |
| 2006 | 16.9°C | 13.5°C | 10.2°C | 21.0°C | 7.1°C | 96 mm | 87% | 1.6 m/s | 3.3 |
| 2005 | 17.1°C | 13.8°C | 10.5°C | 23.3°C | 5.5°C | 117 mm | 86% | 1.7 m/s | 3.2 |
| 2004 | 15.6°C | 12.0°C | 8.5°C | 20.6°C | 4.9°C | 190 mm | 87% | 1.6 m/s | 3.2 |
| 2003 | 18.4°C | 14.5°C | 10.7°C | 26.3°C | 5.7°C | 50 mm | 86% | 1.4 m/s | 3.7 |
| 2002 | 16.1°C | 12.2°C | 8.2°C | 21.3°C | 3.4°C | 99 mm | 85% | 1.6 m/s | 3.4 |
| 2001 🌧️ | 17.3°C | 13.5°C | 9.8°C | 27.5°C | 3.9°C | 208 mm | 87% | 1.5 m/s | 3.5 |
| 2000 | 16.4°C | 12.8°C | 9.2°C | 21.5°C | 2.4°C | 85 mm | 85% | 1.6 m/s | 3.5 |
| 1999 | 18.4°C | 14.6°C | 10.7°C | 24.6°C | 5.4°C | 61 mm | 86% | 1.6 m/s | 3.6 |
| 1998 | 15.5°C | 12.3°C | 9.1°C | 21.7°C | 4.7°C | 139 mm | 88% | 1.6 m/s | 3 |
| 1997 | 16.0°C | 12.7°C | 9.4°C | 21.3°C | 3.3°C | 95 mm | 89% | 1.6 m/s | 3 |
| 1996 | 14.5°C | 11.1°C | 7.6°C | 21.8°C | 2.2°C | 117 mm | 86% | 1.8 m/s | 3.3 |
| 1995 | 15.7°C | 11.9°C | 8.2°C | 20.7°C | 3.1°C | 60 mm | 86% | 1.5 m/s | 3.4 |
| 1994 | 15.7°C | 12.5°C | 9.2°C | 20.8°C | 5.3°C | 116 mm | 86% | 1.7 m/s | 3.3 |
| 1993 | 16.1°C | 12.6°C | 9.0°C | 20.4°C | 4.9°C | 92 mm | 86% | 1.5 m/s | 3.3 |
| 1992 | 16.7°C | 12.9°C | 9.1°C | 21.3°C | 3.8°C | 103 mm | 88% | 1.4 m/s | 3.3 |
| 1991 | 15.2°C | 11.8°C | 8.3°C | 21.4°C | 4.2°C | 104 mm | 88% | 1.4 m/s | 3 |
| 1990 | 17.1°C | 13.2°C | 9.2°C | 22.5°C | 4.8°C | 85 mm | 85% | 1.4 m/s | 3.6 |
| 1989 | 17.5°C | 13.2°C | 8.8°C | 24.2°C | 2.9°C | 68 mm | 83% | 1.6 m/s | 3.5 |
| 1988 | 15.9°C | 12.1°C | 8.3°C | 21.1°C | 3.2°C | 81 mm | 85% | 1.7 m/s | 3.8 |
| 1987 | 15.2°C | 11.8°C | 8.4°C | 19.4°C | 4.2°C | 83 mm | 85% | 1.6 m/s | 3.3 |
| 1986 ❄️ | 13.6°C | 10.6°C | 7.6°C | 18.8°C | 1.7°C | 85 mm | 86% | 1.6 m/s | 3.3 |
| 1985 | 14.9°C | 11.4°C | 8.0°C | 21.5°C | 3.9°C | 61 mm | 85% | 1.4 m/s | 3.6 |
| 1984 | 15.9°C | 12.1°C | 8.4°C | 21.6°C | 4.0°C | 168 mm | 85% | 1.8 m/s | 3.6 |
| 1983 | 15.6°C | 12.3°C | 9.0°C | 23.5°C | 5.7°C | 143 mm | 88% | 1.5 m/s | — |
| 1982 | 16.6°C | 12.8°C | 9.0°C | 21.5°C | 2.7°C | 162 mm | 87% | 1.5 m/s | — |
| 1981 | 15.5°C | 12.7°C | 10.0°C | 20.6°C | 5.1°C | 176 mm | 87% | 1.9 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 16.5°C with lows near 9.3°C (mean 12.9°C), based on 45 years of NASA POWER data.
September averages 106 mm of rainfall in Conception Bay South, about average for rainfall. The wettest on record was 208 mm in 2001.
The hottest September reached 27.5°C in 2001. The coldest dipped to 1.4°C in 2015.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.9°C. Daytime highs moved from 15.7°C to 17.7°C and overnight lows from 8.9°C to 10.7°C over the same span.
September is one of the warmer months of the year in Conception Bay South and about average for rainfall, so plan for around 16.5°C daytime highs and 9.3°C at night.
Not quite — September is the 10th coolest month in Conception Bay South, averaging 12.9°C.
For September in Conception Bay South, pack light layers you can adjust through the day, with typical highs of 16.5°C and lows of 9.3°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 86% — quite humid.
Average wind speed in September is 1.6 m/s. The windiest September on record averaged 1.9 m/s (1981).
The wettest September on record was 2001 with 208 mm. On average, September sees 106 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 Conception Bay South 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.
