September is one of the warmer months of the year in Halifax, with average highs near 18.6°C and lows around 12.7°C (mean 15.7°C). It is about average for rainfall, averaging 95 mm of rainfall and 84% relative humidity across the period.
September is one of the warmer months of the year in Halifax. Across 45 years of records, the warmest September in Halifax was 1999 — when the month averaged 18.8°C — while the coldest was 1986 at 13°C. Typical September days reach 18.6°C with nights near 12.7°C. The long-term trend is warming, about 0.4°C per decade.
September is about average for rainfall in Halifax, averaging 95 mm of rainfall. The wettest September on record was 2012 with 267 mm, while the driest was 1985 at 19 mm.
Relative humidity in Halifax during September averages 84%. The most humid September was 2017 at 89%, and the least humid was 1995 at 81%.
September receives about 4 kWh/m²/day of solar energy in Halifax. The sunniest Septembers were 2003 and 2007 at 4.5 kWh/m²/day, and the cloudiest was 1996 at 3.4.
Average wind speed in Halifax during September is 2.5 m/s. The windiest September was 1981 at 3 m/s, while the calmest was 2003 at 2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 14.9°C | 15.5°C | 15.4°C | 16.2°C | 16.6°C | +1.7°C |
| Avg High | 18.0°C | 18.5°C | 18.4°C | 19.1°C | 19.4°C | +1.4°C |
| Avg Low | 11.8°C | 12.5°C | 12.4°C | 13.3°C | 13.8°C | +2°C |
| Avg Rain | 75 mm | 93 mm | 75 mm | 117 mm | 124 mm | +49 mm |
September temperatures in Halifax have risen by about 1.4°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 5.4°C (2000) to a record high of 28.4°C (2010).
Rainfall in September is about average for rainfall, averaging 95 mm, with a wettest year of 267 mm.
One of the best times to visit Halifax
September is one of the best times to visit Halifax. Expect days averaging 18.6°C and nights around 12.7°C (mean 15.7°C) — warmer than Halifax's yearly average — with higher rainfall (95 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 | 20.2°C | 17.1°C | 14.0°C | 23.1°C | 9.1°C | 52 mm | 82% | 2.2 m/s | 4.4 |
| 2024 | 19.1°C | 16.2°C | 13.2°C | 22.8°C | 10.8°C | 115 mm | 86% | 2.6 m/s | 4.1 |
| 2023 | 19.9°C | 17.2°C | 14.6°C | 23.2°C | 8.9°C | 126 mm | 88% | 2.3 m/s | 3.6 |
| 2022 | 19.4°C | 16.6°C | 13.8°C | 23.8°C | 8.3°C | 157 mm | 83% | 2.7 m/s | 4 |
| 2021 | 19.3°C | 16.9°C | 14.5°C | 22.5°C | 11.1°C | 181 mm | 89% | 2.5 m/s | 3.8 |
| 2020 | 18.6°C | 15.7°C | 12.8°C | 22.6°C | 7.2°C | 113 mm | 85% | 2.5 m/s | 3.9 |
| 2019 | 18.1°C | 15.0°C | 11.9°C | 22.0°C | 7.6°C | 109 mm | 84% | 2.7 m/s | 4.3 |
| 2018 | 19.9°C | 16.8°C | 13.7°C | 24.4°C | 6.5°C | 157 mm | 83% | 2.5 m/s | 4.3 |
| 2017 | 19.5°C | 16.9°C | 14.3°C | 23.3°C | 8.7°C | 128 mm | 89% | 2.5 m/s | 3.7 |
| 2016 | 19.0°C | 16.3°C | 13.6°C | 23.6°C | 7.6°C | 107 mm | 86% | 2.5 m/s | 4 |
| 2015 | 20.4°C | 17.3°C | 14.2°C | 24.3°C | 7.9°C | 92 mm | 86% | 2.5 m/s | 4.3 |
| 2014 | 19.0°C | 15.9°C | 12.8°C | 25.0°C | 7.1°C | 67 mm | 82% | 2.6 m/s | 4.2 |
| 2013 | 18.2°C | 15.2°C | 12.3°C | 22.0°C | 7.8°C | 113 mm | 87% | 2.6 m/s | 3.8 |
| 2012 🌧️ | 18.9°C | 16.2°C | 13.5°C | 22.3°C | 9.0°C | 267 mm | 86% | 2.6 m/s | 4 |
| 2011 | 19.1°C | 16.2°C | 13.3°C | 22.1°C | 8.4°C | 47 mm | 86% | 2.3 m/s | 4.1 |
| 2010 | 19.1°C | 16.4°C | 13.6°C | 28.4°C | 9.7°C | 82 mm | 85% | 2.8 m/s | 3.7 |
| 2009 | 17.3°C | 14.1°C | 11.0°C | 21.4°C | 7.5°C | 53 mm | 85% | 2.5 m/s | 4.4 |
| 2008 | 17.5°C | 15.0°C | 12.4°C | 21.1°C | 6.9°C | 89 mm | 85% | 2.5 m/s | 3.9 |
| 2007 | 18.2°C | 15.2°C | 12.2°C | 22.2°C | 7.7°C | 61 mm | 83% | 2.5 m/s | 4.5 |
| 2006 | 18.6°C | 15.6°C | 12.7°C | 21.5°C | 9.0°C | 34 mm | 85% | 2.5 m/s | 3.9 |
| 2005 | 19.3°C | 16.3°C | 13.4°C | 22.6°C | 9.1°C | 91 mm | 85% | 2.6 m/s | 4.3 |
| 2004 | 17.4°C | 14.3°C | 11.1°C | 20.8°C | 6.3°C | 71 mm | 84% | 2.7 m/s | 4.3 |
| 2003 | 19.4°C | 16.4°C | 13.5°C | 22.1°C | 9.7°C | 110 mm | 85% | 2 m/s | 4.5 |
| 2002 | 19.2°C | 16.1°C | 13.0°C | 25.9°C | 6.2°C | 97 mm | 84% | 2.5 m/s | 4 |
| 2001 | 19.1°C | 15.9°C | 12.8°C | 23.5°C | 8.9°C | 50 mm | 83% | 2.2 m/s | 4.3 |
| 2000 | 17.8°C | 14.8°C | 11.8°C | 23.5°C | 5.4°C | 93 mm | 84% | 2.5 m/s | 4 |
| 1999 🔥 | 22.0°C | 18.8°C | 15.5°C | 27.4°C | 9.1°C | 73 mm | 82% | 2.4 m/s | 4.4 |
| 1998 | 18.5°C | 15.5°C | 12.5°C | 21.2°C | 8.3°C | 78 mm | 84% | 2.5 m/s | 3.6 |
| 1997 | 18.5°C | 15.5°C | 12.6°C | 21.5°C | 6.6°C | 46 mm | 84% | 2.4 m/s | 3.7 |
| 1996 | 17.7°C | 15.2°C | 12.7°C | 22.9°C | 8.0°C | 215 mm | 86% | 2.8 m/s | 3.4 |
| 1995 | 17.4°C | 14.2°C | 11.0°C | 21.4°C | 6.1°C | 54 mm | 81% | 2.4 m/s | 4 |
| 1994 | 17.4°C | 14.6°C | 11.7°C | 21.1°C | 8.3°C | 91 mm | 85% | 2.5 m/s | 3.8 |
| 1993 | 18.7°C | 15.9°C | 13.0°C | 22.3°C | 7.3°C | 80 mm | 84% | 2.5 m/s | 3.5 |
| 1992 | 18.2°C | 15.2°C | 12.1°C | 21.2°C | 6.8°C | 104 mm | 84% | 2.4 m/s | 4 |
| 1991 | 17.7°C | 14.6°C | 11.6°C | 22.2°C | 5.8°C | 116 mm | 84% | 2.7 m/s | 3.6 |
| 1990 | 18.6°C | 15.4°C | 12.1°C | 22.4°C | 8.1°C | 77 mm | 82% | 2.4 m/s | 3.8 |
| 1989 | 19.0°C | 15.5°C | 12.0°C | 25.4°C | 5.5°C | 94 mm | 81% | 2.5 m/s | 4.3 |
| 1988 | 16.8°C | 13.7°C | 10.7°C | 20.8°C | 7.8°C | 55 mm | 82% | 2.6 m/s | 4.1 |
| 1987 | 17.8°C | 15.0°C | 12.1°C | 21.5°C | 6.8°C | 102 mm | 82% | 2.8 m/s | 4 |
| 1986 ❄️ | 16.3°C | 13.0°C | 9.7°C | 20.4°C | 5.6°C | 98 mm | 83% | 2.5 m/s | 4.3 |
| 1985 | 18.1°C | 15.0°C | 11.9°C | 22.5°C | 8.1°C | 19 mm | 85% | 2.1 m/s | 4.3 |
| 1984 | 17.5°C | 14.4°C | 11.3°C | 21.6°C | 6.6°C | 60 mm | 82% | 2.6 m/s | 4.4 |
| 1983 | 19.4°C | 16.4°C | 13.5°C | 23.1°C | 9.1°C | 38 mm | 82% | 2.4 m/s | — |
| 1982 | 18.1°C | 15.2°C | 12.3°C | 21.7°C | 8.8°C | 114 mm | 87% | 2.1 m/s | — |
| 1981 | 18.7°C | 15.8°C | 13.0°C | 22.4°C | 6.8°C | 94 mm | 81% | 3 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 18.6°C with lows near 12.7°C (mean 15.7°C), based on 45 years of NASA POWER data.
September averages 95 mm of rainfall in Halifax, about average for rainfall. The wettest on record was 267 mm in 2012.
The hottest September reached 28.4°C in 2010. The coldest dipped to 5.4°C in 2000.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.4°C. Daytime highs moved from 18.4°C to 19.6°C and overnight lows from 12.4°C to 14°C over the same span.
September is one of the warmer months of the year in Halifax and about average for rainfall, so plan for around 18.6°C daytime highs and 12.7°C at night.
Not quite — September is the 10th coolest month in Halifax, averaging 15.7°C.
For September in Halifax, pack light layers you can adjust through the day, with typical highs of 18.6°C and lows of 12.7°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 84% — quite humid.
Average wind speed in September is 2.5 m/s. The windiest September on record averaged 3 m/s (1981).
The wettest September on record was 2012 with 267 mm. On average, September sees 95 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 Halifax 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.
