September is one of the warmer months of the year in Terrace, with average highs near 11.8°C and lows around 4.4°C (mean 8.1°C). It is a relatively wet time of year, averaging 150 mm of rainfall and 87% relative humidity across the period.
September is one of the warmer months of the year in Terrace. Across 45 years of records, the warmest September in Terrace was 1995 — when the month averaged 11.5°C — while the coldest was 1992 at 5.7°C. Typical September days reach 11.8°C with nights near 4.4°C. The long-term trend is warming, about 0.2°C per decade.
September is a relatively wet time of year in Terrace, averaging 150 mm of rainfall. The wettest September on record was 1992 with 320 mm, while the driest were 1990 and 1995 at 62 mm.
Relative humidity in Terrace during September averages 87%. The most humid September was 2021 at 93%, and the least humid was 1995 at 78%.
September receives about 2.6 kWh/m²/day of solar energy in Terrace. The sunniest September was 1993 at 3.4 kWh/m²/day, and the cloudiest was 2021 at 2.
Average wind speed in Terrace during September is 0.5 m/s. The windiest Septembers were 1986, 2010 and 2011 at 0.6 m/s, while the calmest was 2015 at 0.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 7.6°C | 8.4°C | 7.6°C | 8.3°C | 9.1°C | +1.5°C |
| Avg High | 11.6°C | 12.2°C | 11.0°C | 12.0°C | 12.5°C | +0.9°C |
| Avg Low | 3.6°C | 4.5°C | 4.1°C | 4.5°C | 5.6°C | +2°C |
| Avg Rain | 147 mm | 134 mm | 169 mm | 138 mm | 168 mm | +22 mm |
September temperatures in Terrace have risen by about 1.7°C between 1981–1985 and 2021–2025.
September has ranged from a record low of -4.9°C (2019) to a record high of 27.8°C (2013).
Rainfall in September is a relatively wet time of year, averaging 150 mm, with a wettest year of 320 mm.
One of the best times to visit Terrace
September is one of the best times to visit Terrace. Expect days averaging 11.8°C and nights around 4.4°C (mean 8.1°C) — warmer than Terrace's yearly average — with higher rainfall (150 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 | 14.4°C | 10.4°C | 6.4°C | 27.4°C | -1.1°C | 147 mm | 87% | 0.5 m/s | 2.8 |
| 2024 | 11.5°C | 8.5°C | 5.4°C | 20.4°C | 0.5°C | 220 mm | 90% | 0.5 m/s | 2.4 |
| 2023 | 11.8°C | 8.2°C | 4.7°C | 19.6°C | 1.8°C | 101 mm | 88% | 0.5 m/s | 2.4 |
| 2022 | 14.1°C | 10.3°C | 6.4°C | 19.5°C | 3.0°C | 103 mm | 85% | 0.5 m/s | 3 |
| 2021 | 9.8°C | 7.3°C | 4.8°C | 18.3°C | 1.2°C | 270 mm | 93% | 0.5 m/s | 2 |
| 2020 | 13.6°C | 9.9°C | 6.1°C | 22.8°C | 1.9°C | 169 mm | 89% | 0.5 m/s | 2.6 |
| 2019 | 11.9°C | 8.3°C | 4.7°C | 19.0°C | -4.9°C | 112 mm | 86% | 0.5 m/s | 2.7 |
| 2018 | 11.4°C | 6.9°C | 2.4°C | 16.9°C | -3.9°C | 68 mm | 81% | 0.5 m/s | 2.9 |
| 2017 | 13.0°C | 9.2°C | 5.3°C | 24.4°C | 0.8°C | 130 mm | 86% | 0.5 m/s | 2.8 |
| 2016 | 11.3°C | 7.9°C | 4.5°C | 15.9°C | 0.9°C | 165 mm | 89% | 0.5 m/s | 2.6 |
| 2015 | 9.1°C | 6.2°C | 3.4°C | 14.0°C | 0.8°C | 175 mm | 92% | 0.4 m/s | 2.1 |
| 2014 | 14.1°C | 9.9°C | 5.6°C | 21.1°C | -1.2°C | 100 mm | 83% | 0.5 m/s | 3 |
| 2013 | 14.3°C | 10.1°C | 5.9°C | 27.8°C | -0.6°C | 99 mm | 84% | 0.5 m/s | 3.1 |
| 2012 | 12.9°C | 8.9°C | 4.9°C | 20.1°C | 2.2°C | 120 mm | 85% | 0.5 m/s | 3 |
| 2011 | 10.9°C | 7.9°C | 4.9°C | 19.8°C | -0.8°C | 252 mm | 92% | 0.6 m/s | 2.1 |
| 2010 | 11.5°C | 7.3°C | 3.2°C | 16.3°C | -3.0°C | 158 mm | 85% | 0.6 m/s | 2.9 |
| 2009 | 11.2°C | 7.8°C | 4.4°C | 21.0°C | -1.5°C | 178 mm | 90% | 0.5 m/s | 2.2 |
| 2008 | 11.9°C | 8.1°C | 4.3°C | 18.1°C | 0.3°C | 79 mm | 89% | 0.5 m/s | 2.9 |
| 2007 | 11.0°C | 7.6°C | 4.2°C | 19.1°C | 0.6°C | 149 mm | 90% | 0.5 m/s | 2.6 |
| 2006 | 11.6°C | 8.1°C | 4.6°C | 18.3°C | -2.8°C | 108 mm | 87% | 0.5 m/s | 2.5 |
| 2005 | 10.5°C | 7.3°C | 4.1°C | 16.5°C | 0.2°C | 162 mm | 90% | 0.5 m/s | 2.6 |
| 2004 | 9.8°C | 6.7°C | 3.6°C | 14.1°C | -0.7°C | 214 mm | 90% | 0.5 m/s | 2.4 |
| 2003 | 11.2°C | 7.6°C | 4.1°C | 18.5°C | -3.1°C | 198 mm | 90% | 0.5 m/s | 2.2 |
| 2002 | 10.6°C | 7.3°C | 3.9°C | 13.9°C | 0.3°C | 210 mm | 89% | 0.5 m/s | 2.4 |
| 2001 | 10.5°C | 7.2°C | 3.9°C | 18.8°C | 0.4°C | 228 mm | 89% | 0.5 m/s | 2.3 |
| 2000 | 11.7°C | 7.9°C | 4.1°C | 17.0°C | -0.2°C | 163 mm | 87% | 0.5 m/s | 2.6 |
| 1999 | 10.8°C | 7.2°C | 3.5°C | 22.1°C | -1.9°C | 145 mm | 88% | 0.5 m/s | 2.6 |
| 1998 | 11.6°C | 7.9°C | 4.1°C | 16.5°C | 0.5°C | 118 mm | 86% | 0.5 m/s | 2.9 |
| 1997 | 12.5°C | 8.6°C | 4.7°C | 18.2°C | 0.7°C | 115 mm | 87% | 0.5 m/s | 2.4 |
| 1996 | 10.3°C | 6.7°C | 3.1°C | 16.3°C | -2.2°C | 122 mm | 87% | 0.5 m/s | 2.5 |
| 1995 🔥 | 16.5°C | 11.5°C | 6.5°C | 23.2°C | 1.3°C | 62 mm | 78% | 0.5 m/s | 3 |
| 1994 | 11.6°C | 8.3°C | 5.0°C | 16.9°C | -1.4°C | 235 mm | 89% | 0.5 m/s | 2.3 |
| 1993 | 14.1°C | 9.5°C | 4.8°C | 21.9°C | -2.4°C | 65 mm | 81% | 0.5 m/s | 3.4 |
| 1992 ❄️ 🌧️ | 8.8°C | 5.7°C | 2.6°C | 12.2°C | -2.9°C | 320 mm | 89% | 0.5 m/s | 2.6 |
| 1991 | 12.4°C | 8.7°C | 4.9°C | 19.6°C | 0.2°C | 97 mm | 88% | 0.5 m/s | 2.5 |
| 1990 | 13.5°C | 9.5°C | 5.5°C | 19.9°C | 1.0°C | 62 mm | 84% | 0.5 m/s | 2.6 |
| 1989 | 14.3°C | 9.9°C | 5.5°C | 21.0°C | -0.2°C | 87 mm | 84% | 0.5 m/s | 3 |
| 1988 | 11.0°C | 7.3°C | 3.6°C | 27.5°C | -0.6°C | 172 mm | 86% | 0.5 m/s | 2.4 |
| 1987 | 11.8°C | 8.3°C | 4.8°C | 20.3°C | -0.4°C | 269 mm | 89% | 0.5 m/s | 2.5 |
| 1986 | 12.3°C | 7.4°C | 2.6°C | 18.3°C | -2.5°C | 92 mm | 79% | 0.6 m/s | 3 |
| 1985 | 11.0°C | 7.0°C | 2.9°C | 17.5°C | -2.9°C | 127 mm | 81% | 0.5 m/s | 2.9 |
| 1984 | 10.1°C | 5.8°C | 1.6°C | 14.6°C | -3.9°C | 104 mm | 85% | 0.5 m/s | 2.7 |
| 1983 | 9.3°C | 5.9°C | 2.5°C | 16.8°C | -2.7°C | 170 mm | 87% | 0.5 m/s | — |
| 1982 | 13.6°C | 9.4°C | 5.2°C | 20.4°C | 1.1°C | 116 mm | 85% | 0.5 m/s | — |
| 1981 | 11.3°C | 7.7°C | 4.1°C | 19.6°C | -2.2°C | 182 mm | 88% | 0.5 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 11.8°C with lows near 4.4°C (mean 8.1°C), based on 45 years of NASA POWER data.
September averages 150 mm of rainfall in Terrace, a relatively wet time of year. The wettest on record was 320 mm in 1992.
The hottest September reached 27.8°C in 2013. The coldest dipped to -4.9°C in 2019.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.7°C. Daytime highs moved from 11.1°C to 12.3°C and overnight lows from 3.3°C to 5.5°C over the same span.
September is one of the warmer months of the year in Terrace and a relatively wet time of year, so plan for around 11.8°C daytime highs and 4.4°C at night.
Not quite — September is the 9th coolest month in Terrace, averaging 8.1°C.
For September in Terrace, pack warm layers and a jacket for chilly mornings, with typical highs of 11.8°C and lows of 4.4°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 87% — quite humid.
Average wind speed in September is 0.5 m/s. The windiest September on record averaged 0.6 m/s (1986).
The wettest September on record was 1992 with 320 mm. On average, September sees 150 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 Terrace 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.
