September is one of the warmer months of the year in Prince Rupert, with average highs near 13.9°C and lows around 10.1°C (mean 12°C). It is a relatively wet time of year, averaging 206 mm of rainfall and 86% relative humidity across the period.
September is one of the warmer months of the year in Prince Rupert. Across 45 years of records, the warmest September in Prince Rupert was 1995 — when the month averaged 14.4°C — while the coldest was 1992 at 10.2°C. Typical September days reach 13.9°C with nights near 10.1°C. The long-term trend is warming, about 0.2°C per decade.
September is a relatively wet time of year in Prince Rupert, averaging 206 mm of rainfall. The wettest September on record was 2021 with 396 mm, while the driest was 1990 at 76 mm.
Relative humidity in Prince Rupert during September averages 86%. The most humid September was 2024 at 90%, and the least humid was 1986 at 79%.
September receives about 2.7 kWh/m²/day of solar energy in Prince Rupert. The sunniest September was 1993 at 3.3 kWh/m²/day, and the cloudiest was 2021 at 2.1.
Average wind speed in Prince Rupert during September is 2.9 m/s. The windiest September was 2011 at 4.4 m/s, while the calmest were 1986 and 1995 at 2.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 11.7°C | 12.1°C | 11.7°C | 12.3°C | 12.5°C | +0.8°C |
| Avg High | 13.8°C | 14.0°C | 13.4°C | 14.2°C | 14.2°C | +0.4°C |
| Avg Low | 9.6°C | 10.1°C | 9.9°C | 10.4°C | 10.7°C | +1.1°C |
| Avg Rain | 211 mm | 172 mm | 236 mm | 191 mm | 230 mm | +19 mm |
September temperatures in Prince Rupert have risen by about 0.8°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 5.1°C (1996) to a record high of 22.7°C (1988).
Rainfall in September is a relatively wet time of year, averaging 206 mm, with a wettest year of 396 mm.
One of the best times to visit Prince Rupert
September is one of the best times to visit Prince Rupert. Expect days averaging 13.9°C and nights around 10.1°C (mean 12°C) — warmer than Prince Rupert's yearly average — with higher rainfall (206 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 | 14.9°C | 13.0°C | 11.2°C | 21.7°C | 7.5°C | 211 mm | 88% | 3.3 m/s | 2.6 |
| 2024 | 13.2°C | 11.8°C | 10.4°C | 17.8°C | 6.4°C | 268 mm | 90% | 2.8 m/s | 2.5 |
| 2023 | 13.8°C | 12.1°C | 10.4°C | 18.8°C | 7.7°C | 162 mm | 86% | 3.6 m/s | 2.3 |
| 2022 | 15.0°C | 13.1°C | 11.1°C | 17.6°C | 9.1°C | 152 mm | 89% | 3 m/s | 3 |
| 2021 🌧️ | 12.9°C | 11.4°C | 10.0°C | 16.3°C | 7.9°C | 396 mm | 89% | 3.8 m/s | 2.1 |
| 2020 | 15.2°C | 13.3°C | 11.3°C | 19.2°C | 8.8°C | 192 mm | 87% | 2.6 m/s | 2.5 |
| 2019 | 14.9°C | 12.8°C | 10.8°C | 20.1°C | 5.6°C | 140 mm | 83% | 2.6 m/s | 2.9 |
| 2018 | 14.4°C | 12.1°C | 9.8°C | 17.4°C | 5.2°C | 101 mm | 80% | 2.3 m/s | 3.2 |
| 2017 | 14.7°C | 12.8°C | 11.0°C | 22.7°C | 8.5°C | 170 mm | 86% | 2.6 m/s | 2.9 |
| 2016 | 13.6°C | 12.0°C | 10.3°C | 15.8°C | 8.2°C | 227 mm | 88% | 2.6 m/s | 2.5 |
| 2015 | 12.4°C | 10.9°C | 9.4°C | 15.6°C | 7.0°C | 226 mm | 87% | 3 m/s | 2.4 |
| 2014 | 15.3°C | 13.3°C | 11.3°C | 18.5°C | 9.2°C | 158 mm | 86% | 2.6 m/s | 2.8 |
| 2013 | 15.0°C | 13.0°C | 11.0°C | 21.2°C | 6.4°C | 135 mm | 86% | 3 m/s | 3.1 |
| 2012 | 13.5°C | 11.6°C | 9.7°C | 18.1°C | 7.8°C | 198 mm | 88% | 3.1 m/s | 2.8 |
| 2011 | 13.6°C | 11.9°C | 10.3°C | 18.9°C | 7.0°C | 389 mm | 87% | 4.4 m/s | 2.2 |
| 2010 | 14.6°C | 12.3°C | 10.1°C | 19.3°C | 7.6°C | 165 mm | 82% | 3.1 m/s | 3 |
| 2009 | 13.6°C | 11.8°C | 10.0°C | 18.2°C | 5.7°C | 278 mm | 86% | 3.8 m/s | 2.2 |
| 2008 | 13.3°C | 11.7°C | 10.0°C | 18.9°C | 6.6°C | 115 mm | 87% | 2.5 m/s | 2.7 |
| 2007 | 13.3°C | 11.7°C | 10.0°C | 20.3°C | 7.4°C | 241 mm | 88% | 2.9 m/s | 2.6 |
| 2006 | 13.7°C | 12.0°C | 10.3°C | 16.7°C | 6.3°C | 178 mm | 87% | 3 m/s | 2.4 |
| 2005 | 13.3°C | 11.7°C | 10.0°C | 17.5°C | 6.3°C | 195 mm | 88% | 3 m/s | 2.8 |
| 2004 | 13.1°C | 11.2°C | 9.4°C | 15.6°C | 7.1°C | 235 mm | 86% | 3.2 m/s | 2.7 |
| 2003 | 13.9°C | 12.1°C | 10.3°C | 19.5°C | 6.2°C | 264 mm | 86% | 3.5 m/s | 2.4 |
| 2002 | 13.1°C | 11.4°C | 9.7°C | 16.9°C | 7.4°C | 266 mm | 88% | 2.8 m/s | 2.6 |
| 2001 | 13.0°C | 11.3°C | 9.7°C | 17.0°C | 7.7°C | 341 mm | 87% | 3.7 m/s | 2.4 |
| 2000 | 13.4°C | 11.6°C | 9.8°C | 15.4°C | 7.4°C | 247 mm | 86% | 3.1 m/s | 2.6 |
| 1999 | 12.7°C | 10.9°C | 9.1°C | 17.4°C | 5.7°C | 203 mm | 86% | 2.9 m/s | 2.6 |
| 1998 | 13.6°C | 11.6°C | 9.7°C | 16.8°C | 7.8°C | 168 mm | 85% | 3.1 m/s | 3 |
| 1997 | 15.1°C | 13.2°C | 11.2°C | 17.7°C | 8.1°C | 135 mm | 84% | 3 m/s | 2.6 |
| 1996 | 12.7°C | 11.0°C | 9.2°C | 16.9°C | 5.1°C | 150 mm | 84% | 2.6 m/s | 2.6 |
| 1995 🔥 | 16.9°C | 14.4°C | 11.9°C | 21.6°C | 8.7°C | 92 mm | 83% | 2.1 m/s | 2.8 |
| 1994 | 14.0°C | 12.2°C | 10.3°C | 17.3°C | 6.5°C | 291 mm | 87% | 3.2 m/s | 2.4 |
| 1993 | 14.9°C | 12.4°C | 9.9°C | 20.7°C | 5.5°C | 92 mm | 85% | 2.3 m/s | 3.3 |
| 1992 ❄️ | 11.8°C | 10.2°C | 8.6°C | 13.6°C | 5.5°C | 373 mm | 85% | 3.7 m/s | 2.6 |
| 1991 | 13.8°C | 12.1°C | 10.3°C | 18.7°C | 8.1°C | 138 mm | 87% | 2.6 m/s | 2.6 |
| 1990 | 14.7°C | 12.7°C | 10.7°C | 18.6°C | 8.1°C | 76 mm | 84% | 2.5 m/s | 2.8 |
| 1989 | 15.4°C | 13.2°C | 10.9°C | 22.2°C | 8.6°C | 130 mm | 85% | 2.5 m/s | 3.2 |
| 1988 | 13.1°C | 11.2°C | 9.2°C | 22.7°C | 6.4°C | 222 mm | 86% | 2.9 m/s | 2.6 |
| 1987 | 13.3°C | 11.6°C | 9.8°C | 17.7°C | 7.2°C | 370 mm | 88% | 2.9 m/s | 2.2 |
| 1986 | 14.5°C | 12.0°C | 9.5°C | 21.0°C | 6.4°C | 139 mm | 79% | 2.1 m/s | 3.2 |
| 1985 | 13.0°C | 10.9°C | 8.7°C | 16.4°C | 6.3°C | 220 mm | 83% | 2.5 m/s | 2.9 |
| 1984 | 13.5°C | 11.3°C | 9.1°C | 16.0°C | 6.3°C | 120 mm | 81% | 2.8 m/s | 2.6 |
| 1983 | 12.8°C | 10.9°C | 9.1°C | 18.7°C | 5.3°C | 268 mm | 82% | 2.7 m/s | — |
| 1982 | 14.7°C | 12.5°C | 10.3°C | 19.9°C | 7.1°C | 150 mm | 86% | 2.3 m/s | — |
| 1981 | 14.0°C | 12.1°C | 10.1°C | 18.6°C | 6.8°C | 283 mm | 84% | 3.4 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 13.9°C with lows near 10.1°C (mean 12°C), based on 45 years of NASA POWER data.
September averages 206 mm of rainfall in Prince Rupert, a relatively wet time of year. The wettest on record was 396 mm in 2021.
The hottest September reached 22.7°C in 1988. The coldest dipped to 5.1°C in 1996.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 0.8°C. Daytime highs moved from 13.6°C to 14°C and overnight lows from 9.5°C to 10.6°C over the same span.
September is one of the warmer months of the year in Prince Rupert and a relatively wet time of year, so plan for around 13.9°C daytime highs and 10.1°C at night.
Not quite — September is the 10th coolest month in Prince Rupert, averaging 12°C.
For September in Prince Rupert, pack light layers you can adjust through the day, with typical highs of 13.9°C and lows of 10.1°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 86% — quite humid.
Average wind speed in September is 2.9 m/s. The windiest September on record averaged 4.4 m/s (2011).
The wettest September on record was 2021 with 396 mm. On average, September sees 206 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 Prince Rupert 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.
