September is one of the warmer months of the year in Selkirk, with average highs near 19.7°C and lows around 8.1°C (mean 13.9°C). It is about average for rainfall, averaging 52 mm of rainfall and 69% relative humidity across the period.
September is one of the warmer months of the year in Selkirk. Across 45 years of records, the warmest September in Selkirk was 2024 — when the month averaged 19°C — while the coldest was 1985 at 9.9°C. Typical September days reach 19.7°C with nights near 8.1°C. The long-term trend is warming, about 0.8°C per decade.
September is about average for rainfall in Selkirk, averaging 52 mm of rainfall. The wettest September on record was 2019 with 133 mm, while the driest was 1998 at 17 mm.
Relative humidity in Selkirk during September averages 69%. The most humid September was 2004 at 78%, and the least humid was 2012 at 58%.
September receives about 3.5 kWh/m²/day of solar energy in Selkirk. The sunniest Septembers were 2009 and 2011 at 4.1 kWh/m²/day, and the cloudiest was 1985 at 3.
Average wind speed in Selkirk during September is 3.2 m/s. The windiest Septembers were 1985 and 1991 at 3.6 m/s, while the calmest were 1987 and 2001 at 2.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 12.6°C | 13.5°C | 14.1°C | 13.9°C | 16.3°C | +3.7°C |
| Avg High | 18.2°C | 19.4°C | 19.9°C | 19.7°C | 22.3°C | +4.1°C |
| Avg Low | 6.9°C | 7.6°C | 8.4°C | 8.2°C | 10.5°C | +3.6°C |
| Avg Rain | 53 mm | 45 mm | 59 mm | 64 mm | 32 mm | -21 mm |
September temperatures in Selkirk have risen by about 5.2°C between 1981–1985 and 2021–2025.
September has ranged from a record low of -5.1°C (2018) to a record high of 35.5°C (2023).
Rainfall in September is about average for rainfall, averaging 52 mm, with a wettest year of 133 mm.
One of the best times to visit Selkirk
September is one of the best times to visit Selkirk. Expect days averaging 19.7°C and nights around 8.1°C (mean 13.9°C) — warmer than Selkirk's yearly average — with moderate rainfall (52 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 | 23.4°C | 17.6°C | 11.9°C | 30.4°C | 3.4°C | 30 mm | 69% | 3 m/s | 3.4 |
| 2024 🔥 | 24.9°C | 19.0°C | 13.0°C | 31.1°C | 6.7°C | 30 mm | 66% | 3.4 m/s | 3.8 |
| 2023 | 23.3°C | 17.5°C | 11.8°C | 35.5°C | 5.5°C | 37 mm | 68% | 2.9 m/s | 3.6 |
| 2022 | 20.8°C | 15.0°C | 9.2°C | 31.7°C | 1.4°C | 34 mm | 69% | 3.2 m/s | 3.8 |
| 2021 | 22.5°C | 16.5°C | 10.5°C | 28.9°C | 6.0°C | 36 mm | 67% | 3.4 m/s | 3.8 |
| 2020 | 18.6°C | 12.5°C | 6.4°C | 28.1°C | 0.2°C | 29 mm | 68% | 3.5 m/s | 3.5 |
| 2019 🌧️ | 19.0°C | 13.8°C | 8.7°C | 28.9°C | 0.3°C | 133 mm | 78% | 3 m/s | 3.2 |
| 2018 | 17.7°C | 12.1°C | 6.5°C | 28.3°C | -5.1°C | 41 mm | 68% | 3.2 m/s | 3.3 |
| 2017 | 19.9°C | 14.5°C | 9.0°C | 31.5°C | 4.0°C | 84 mm | 72% | 3.5 m/s | 3.3 |
| 2016 | 20.5°C | 14.8°C | 9.1°C | 29.4°C | 2.7°C | 64 mm | 73% | 3.3 m/s | 3.4 |
| 2015 | 22.4°C | 16.2°C | 10.0°C | 31.7°C | 1.4°C | 47 mm | 69% | 3.4 m/s | 3.7 |
| 2014 | 19.3°C | 13.3°C | 7.3°C | 27.5°C | 1.7°C | 41 mm | 75% | 3.2 m/s | 3.3 |
| 2013 | 22.0°C | 15.8°C | 9.7°C | 31.0°C | 3.1°C | 48 mm | 69% | 3.2 m/s | 3.8 |
| 2012 | 19.7°C | 13.4°C | 7.1°C | 29.8°C | -1.1°C | 29 mm | 58% | 3.4 m/s | 3.4 |
| 2011 | 20.2°C | 14.0°C | 7.9°C | 30.0°C | 0.2°C | 53 mm | 68% | 3.3 m/s | 4.1 |
| 2010 | 16.5°C | 11.4°C | 6.4°C | 22.6°C | 0.0°C | 99 mm | 77% | 3.4 m/s | 3.5 |
| 2009 | 23.7°C | 17.8°C | 11.8°C | 28.6°C | 0.3°C | 47 mm | 75% | 3 m/s | 4.1 |
| 2008 | 18.9°C | 13.5°C | 8.1°C | 27.6°C | 3.1°C | 94 mm | 75% | 2.9 m/s | 3.5 |
| 2007 | 19.2°C | 13.3°C | 7.5°C | 28.9°C | -0.2°C | 46 mm | 71% | 3.4 m/s | 3.1 |
| 2006 | 20.0°C | 13.8°C | 7.7°C | 29.5°C | 1.2°C | 71 mm | 68% | 2.9 m/s | 3.8 |
| 2005 | 20.2°C | 14.4°C | 8.7°C | 27.6°C | 2.6°C | 32 mm | 73% | 2.9 m/s | 3.8 |
| 2004 | 20.1°C | 14.7°C | 9.3°C | 29.7°C | 3.4°C | 77 mm | 78% | 3 m/s | 3.2 |
| 2003 | 18.2°C | 13.0°C | 7.8°C | 30.8°C | -2.1°C | 74 mm | 74% | 3.4 m/s | 3.2 |
| 2002 | 20.6°C | 14.7°C | 8.8°C | 30.3°C | -2.3°C | 67 mm | 69% | 3.1 m/s | 3.5 |
| 2001 | 20.3°C | 14.1°C | 7.9°C | 30.3°C | -0.7°C | 18 mm | 67% | 2.6 m/s | 3.9 |
| 2000 | 17.5°C | 11.7°C | 5.9°C | 26.9°C | -1.4°C | 60 mm | 73% | 3.3 m/s | 3.2 |
| 1999 | 16.8°C | 11.6°C | 6.4°C | 24.7°C | 0.1°C | 54 mm | 73% | 3.2 m/s | 3.1 |
| 1998 | 21.4°C | 15.4°C | 9.4°C | 32.6°C | 3.2°C | 17 mm | 67% | 3 m/s | 3.8 |
| 1997 | 21.3°C | 15.3°C | 9.3°C | 27.8°C | 2.4°C | 25 mm | 65% | 3.5 m/s | 3.7 |
| 1996 | 20.0°C | 14.1°C | 8.2°C | 30.5°C | 0.3°C | 55 mm | 68% | 2.8 m/s | 3.4 |
| 1995 | 19.8°C | 13.5°C | 7.2°C | 31.3°C | -1.2°C | 32 mm | 63% | 2.9 m/s | 3.9 |
| 1994 | 22.1°C | 16.0°C | 9.8°C | 30.1°C | 2.5°C | 56 mm | 67% | 3 m/s | 3.8 |
| 1993 | 16.3°C | 10.6°C | 5.0°C | 22.8°C | 0.1°C | 18 mm | 72% | 3.4 m/s | 3.2 |
| 1992 | 17.7°C | 11.7°C | 5.7°C | 24.4°C | -1.9°C | 46 mm | 69% | 3.5 m/s | 3.2 |
| 1991 | 18.0°C | 12.4°C | 6.8°C | 30.1°C | -0.9°C | 113 mm | 68% | 3.6 m/s | 3.4 |
| 1990 | 20.8°C | 14.5°C | 8.2°C | 30.9°C | 0.4°C | 35 mm | 64% | 3.3 m/s | 3.6 |
| 1989 | 20.3°C | 13.9°C | 7.5°C | 29.4°C | -1.1°C | 18 mm | 62% | 3.3 m/s | 3.9 |
| 1988 | 18.8°C | 13.1°C | 7.3°C | 29.3°C | 2.5°C | 64 mm | 66% | 3.5 m/s | 3.2 |
| 1987 | 20.5°C | 14.8°C | 9.0°C | 29.9°C | 2.9°C | 31 mm | 68% | 2.6 m/s | 3.5 |
| 1986 | 17.3°C | 12.1°C | 6.8°C | 23.0°C | 1.3°C | 65 mm | 72% | 2.8 m/s | 3.2 |
| 1985 ❄️ | 14.9°C | 9.9°C | 4.9°C | 23.3°C | -3.3°C | 51 mm | 75% | 3.6 m/s | 3 |
| 1984 | 16.0°C | 10.6°C | 5.2°C | 25.6°C | -3.2°C | 63 mm | 67% | 3.1 m/s | 3.2 |
| 1983 | 18.5°C | 13.1°C | 7.7°C | 32.4°C | -0.6°C | 62 mm | 69% | 3.5 m/s | — |
| 1982 | 18.9°C | 12.9°C | 6.9°C | 32.1°C | 0.4°C | 47 mm | 68% | 3.3 m/s | — |
| 1981 | 18.7°C | 12.9°C | 7.1°C | 28.6°C | -0.7°C | 78 mm | 68% | 3.3 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 19.7°C with lows near 8.1°C (mean 13.9°C), based on 45 years of NASA POWER data.
September averages 52 mm of rainfall in Selkirk, about average for rainfall. The wettest on record was 133 mm in 2019.
The hottest September reached 35.5°C in 2023. The coldest dipped to -5.1°C in 2018.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 5.2°C. Daytime highs moved from 17.4°C to 23°C and overnight lows from 6.4°C to 11.3°C over the same span.
September is one of the warmer months of the year in Selkirk and about average for rainfall, so plan for around 19.7°C daytime highs and 8.1°C at night.
Not quite — September is the 9th coolest month in Selkirk, averaging 13.9°C.
For September in Selkirk, pack light layers you can adjust through the day, with typical highs of 19.7°C and lows of 8.1°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 69% — moderately humid.
Average wind speed in September is 3.2 m/s. The windiest September on record averaged 3.6 m/s (1985).
The wettest September on record was 2019 with 133 mm. On average, September sees 52 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 Selkirk 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.
