September is one of the warmer months of the year in Sept-Îles, with average highs near 12.8°C and lows around 9.4°C (mean 11.1°C). It is about average for rainfall, averaging 94 mm of rainfall and 85% relative humidity across the period.
September is one of the warmer months of the year in Sept-Îles. Across 45 years of records, the warmest September in Sept-Îles was 2023 — when the month averaged 14.6°C — while the coldest was 1986 at 8.6°C. Typical September days reach 12.8°C with nights near 9.4°C. The long-term trend is warming, about 0.5°C per decade.
September is about average for rainfall in Sept-Îles, averaging 94 mm of rainfall. The wettest September on record was 1994 with 167 mm, while the driest was 1996 at 43 mm.
Relative humidity in Sept-Îles during September averages 85%. The most humid September was 2003 at 88%, and the least humid was 2014 at 80%.
September receives about 3.2 kWh/m²/day of solar energy in Sept-Îles. The sunniest September was 1984 at 3.7 kWh/m²/day, and the cloudiest was 2021 at 2.7.
Average wind speed in Sept-Îles during September is 3.1 m/s. The windiest September was 1984 at 4 m/s, while the calmest were 2002, 2017 and 2025, among others at 2.7 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 10.3°C | 10.8°C | 11.0°C | 11.5°C | 12.4°C | +2.1°C |
| Avg High | 12.1°C | 12.5°C | 12.7°C | 13.2°C | 14.0°C | +1.9°C |
| Avg Low | 8.6°C | 9.2°C | 9.2°C | 9.8°C | 10.7°C | +2.1°C |
| Avg Rain | 93 mm | 101 mm | 105 mm | 91 mm | 72 mm | -21 mm |
September temperatures in Sept-Îles have risen by about 1.8°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 1.8°C (2000) to a record high of 21.7°C (2008).
Rainfall in September is about average for rainfall, averaging 94 mm, with a wettest year of 167 mm.
One of the best times to visit Sept-Îles
September is one of the best times to visit Sept-Îles. Expect days averaging 12.8°C and nights around 9.4°C (mean 11.1°C) — warmer than Sept-Îles's yearly average — with higher rainfall (94 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 | 14.0°C | 12.3°C | 10.5°C | 17.7°C | 7.2°C | 58 mm | 84% | 2.7 m/s | 3.4 |
| 2024 | 14.5°C | 12.9°C | 11.4°C | 20.7°C | 9.1°C | 49 mm | 86% | 2.8 m/s | 3.4 |
| 2023 🔥 | 16.4°C | 14.6°C | 12.9°C | 19.8°C | 9.1°C | 81 mm | 86% | 3 m/s | 3.2 |
| 2022 | 13.4°C | 11.8°C | 10.3°C | 18.1°C | 6.0°C | 45 mm | 84% | 3.1 m/s | 3.3 |
| 2021 | 14.1°C | 12.6°C | 11.1°C | 17.2°C | 7.0°C | 134 mm | 86% | 3.4 m/s | 2.7 |
| 2020 | 11.8°C | 9.9°C | 8.0°C | 15.4°C | 3.4°C | 66 mm | 84% | 2.9 m/s | 3.1 |
| 2019 | 12.3°C | 10.6°C | 8.8°C | 16.6°C | 4.9°C | 77 mm | 83% | 3.3 m/s | 3.2 |
| 2018 | 12.8°C | 11.0°C | 9.1°C | 19.8°C | 4.6°C | 95 mm | 83% | 3.4 m/s | 3.3 |
| 2017 | 13.4°C | 11.7°C | 10.1°C | 16.4°C | 5.1°C | 97 mm | 86% | 2.7 m/s | 2.9 |
| 2016 | 13.1°C | 11.3°C | 9.6°C | 18.7°C | 5.8°C | 99 mm | 85% | 3.4 m/s | 3 |
| 2015 | 14.5°C | 12.6°C | 10.8°C | 19.5°C | 5.4°C | 62 mm | 83% | 3.2 m/s | 3.5 |
| 2014 | 13.3°C | 11.4°C | 9.5°C | 19.7°C | 4.3°C | 61 mm | 80% | 3.6 m/s | 3.2 |
| 2013 | 12.3°C | 10.7°C | 9.0°C | 15.3°C | 5.9°C | 93 mm | 84% | 3.5 m/s | 2.9 |
| 2012 | 13.9°C | 12.3°C | 10.8°C | 17.1°C | 6.4°C | 59 mm | 86% | 3.1 m/s | 3.1 |
| 2011 | 13.4°C | 11.7°C | 9.9°C | 18.4°C | 7.0°C | 100 mm | 85% | 3 m/s | 3.6 |
| 2010 | 13.0°C | 11.7°C | 10.3°C | 19.4°C | 5.7°C | 164 mm | 84% | 3.4 m/s | 2.9 |
| 2009 | 12.5°C | 10.5°C | 8.5°C | 17.3°C | 4.8°C | 63 mm | 84% | 2.9 m/s | 3.4 |
| 2008 | 13.4°C | 11.7°C | 9.9°C | 21.7°C | 4.0°C | 134 mm | 85% | 2.9 m/s | 3 |
| 2007 | 11.5°C | 9.8°C | 8.2°C | 17.1°C | 5.0°C | 132 mm | 84% | 3.5 m/s | 3 |
| 2006 | 12.6°C | 10.7°C | 8.8°C | 17.8°C | 5.4°C | 146 mm | 85% | 2.9 m/s | 3.4 |
| 2005 | 13.0°C | 11.5°C | 10.0°C | 17.1°C | 6.3°C | 130 mm | 86% | 3.1 m/s | 3.2 |
| 2004 | 12.5°C | 10.6°C | 8.7°C | 15.2°C | 6.0°C | 74 mm | 84% | 2.8 m/s | 3.3 |
| 2003 | 14.2°C | 12.5°C | 10.8°C | 17.7°C | 7.1°C | 58 mm | 88% | 2.8 m/s | 3.4 |
| 2002 | 12.4°C | 10.7°C | 9.0°C | 16.5°C | 3.2°C | 82 mm | 86% | 2.7 m/s | 3.2 |
| 2001 | 13.3°C | 11.5°C | 9.8°C | 18.7°C | 5.6°C | 114 mm | 86% | 2.9 m/s | 3.2 |
| 2000 | 11.9°C | 10.2°C | 8.5°C | 16.5°C | 1.8°C | 116 mm | 83% | 3.3 m/s | 3 |
| 1999 | 14.6°C | 13.1°C | 11.6°C | 18.5°C | 7.3°C | 108 mm | 88% | 2.7 m/s | 2.9 |
| 1998 | 13.2°C | 11.7°C | 10.3°C | 16.9°C | 7.1°C | 121 mm | 85% | 3.7 m/s | 2.8 |
| 1997 | 12.8°C | 11.2°C | 9.5°C | 16.6°C | 4.3°C | 83 mm | 86% | 3.1 m/s | 2.8 |
| 1996 | 13.1°C | 11.3°C | 9.5°C | 16.9°C | 5.8°C | 43 mm | 81% | 2.9 m/s | 3.6 |
| 1995 | 11.7°C | 9.9°C | 8.2°C | 15.5°C | 4.0°C | 85 mm | 83% | 3.2 m/s | 3 |
| 1994 🌧️ | 11.8°C | 10.1°C | 8.5°C | 13.8°C | 6.1°C | 167 mm | 87% | 3 m/s | 3.1 |
| 1993 | 11.7°C | 9.9°C | 8.2°C | 15.1°C | 2.8°C | 120 mm | 84% | 3.2 m/s | 2.9 |
| 1992 | 12.6°C | 10.9°C | 9.3°C | 16.2°C | 4.1°C | 100 mm | 87% | 3.1 m/s | 3 |
| 1991 | 11.8°C | 10.0°C | 8.1°C | 16.2°C | 4.0°C | 77 mm | 83% | 3.2 m/s | 3.2 |
| 1990 | 12.1°C | 10.2°C | 8.4°C | 15.4°C | 4.6°C | 107 mm | 84% | 3.2 m/s | 3.1 |
| 1989 | 12.9°C | 10.9°C | 8.9°C | 18.4°C | 3.0°C | 81 mm | 83% | 3.2 m/s | 3.6 |
| 1988 | 10.6°C | 8.8°C | 7.1°C | 14.8°C | 4.3°C | 131 mm | 85% | 3.2 m/s | 3.1 |
| 1987 | 11.6°C | 10.0°C | 8.4°C | 15.8°C | 5.0°C | 68 mm | 87% | 2.8 m/s | 3.4 |
| 1986 ❄️ | 10.2°C | 8.6°C | 7.0°C | 13.6°C | 3.5°C | 129 mm | 83% | 3.6 m/s | 3.4 |
| 1985 | 13.4°C | 11.5°C | 9.6°C | 17.4°C | 6.0°C | 95 mm | 83% | 3 m/s | 3.5 |
| 1984 | 12.1°C | 10.2°C | 8.3°C | 18.6°C | 2.1°C | 75 mm | 81% | 4 m/s | 3.7 |
| 1983 | 13.8°C | 12.1°C | 10.3°C | 18.1°C | 6.8°C | 88 mm | 85% | 3.2 m/s | — |
| 1982 | 11.1°C | 9.4°C | 7.8°C | 15.4°C | 3.4°C | 85 mm | 86% | 2.8 m/s | — |
| 1981 | 13.4°C | 11.6°C | 9.9°C | 16.7°C | 6.0°C | 88 mm | 84% | 3.3 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 12.8°C with lows near 9.4°C (mean 11.1°C), based on 45 years of NASA POWER data.
September averages 94 mm of rainfall in Sept-Îles, about average for rainfall. The wettest on record was 167 mm in 1994.
The hottest September reached 21.7°C in 2008. The coldest dipped to 1.8°C in 2000.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.8°C. Daytime highs moved from 12.8°C to 14.5°C and overnight lows from 9.2°C to 11.2°C over the same span.
September is one of the warmer months of the year in Sept-Îles and about average for rainfall, so plan for around 12.8°C daytime highs and 9.4°C at night.
Not quite — September is the 9th coolest month in Sept-Îles, averaging 11.1°C.
For September in Sept-Îles, pack light layers you can adjust through the day, with typical highs of 12.8°C and lows of 9.4°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 85% — quite humid.
Average wind speed in September is 3.1 m/s. The windiest September on record averaged 4 m/s (1984).
The wettest September on record was 1994 with 167 mm. On average, September sees 94 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 Sept-Îles 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.
