August is one of the warmer months of the year in Sault Ste. Marie, with average highs near 21.8°C and lows around 13.1°C (mean 17.5°C). It is a relatively wet time of year, averaging 85 mm of rainfall and 81% relative humidity across the period.
August is one of the warmer months of the year in Sault Ste. Marie. Across 45 years of records, the warmest August in Sault Ste. Marie was 2021 — when the month averaged 20°C — while the coldest was 1982 at 14.1°C. Typical August days reach 21.8°C with nights near 13.1°C. The long-term trend is warming, about 0.5°C per decade.
August is a relatively wet time of year in Sault Ste. Marie, averaging 85 mm of rainfall. The wettest August on record was 1988 with 141 mm, while the driest was 2007 at 35 mm.
Relative humidity in Sault Ste. Marie during August averages 81%. The most humid August was 2015 at 86%, and the least humid was 2007 at 72%.
August receives about 5 kWh/m²/day of solar energy in Sault Ste. Marie. The sunniest August was 2008 at 5.9 kWh/m²/day, and the cloudiest were 1988 and 2015 at 4.4.
Average wind speed in Sault Ste. Marie during August is 1.3 m/s. The windiest August was 2012 at 1.6 m/s, while the calmest was 1984 at 1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 16.7°C | 16.9°C | 17.3°C | 18.1°C | 18.5°C | +1.8°C |
| Avg High | 21.3°C | 21.4°C | 21.7°C | 22.2°C | 22.6°C | +1.3°C |
| Avg Low | 12.2°C | 12.3°C | 12.9°C | 14.0°C | 14.4°C | +2.2°C |
| Avg Rain | 98 mm | 77 mm | 79 mm | 86 mm | 89 mm | -9 mm |
August temperatures in Sault Ste. Marie have risen by about 1.6°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 3°C (1982) to a record high of 30.8°C (2007).
Rainfall in August is a relatively wet time of year, averaging 85 mm, with a wettest year of 141 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.3°C per decade while lows rose 0.6°C per decade, narrowing the gap between day and night.
One of the best times to visit Sault Ste. Marie
August is one of the best times to visit Sault Ste. Marie. Expect days averaging 21.8°C and nights around 13.1°C (mean 17.5°C) — warmer than Sault Ste. Marie's yearly average — with higher rainfall (85 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 | 22.3°C | 18.3°C | 14.4°C | 27.6°C | 7.2°C | 90 mm | 82% | 1.4 m/s | 4.8 |
| 2024 | 23.4°C | 19.0°C | 14.7°C | 28.9°C | 8.7°C | 81 mm | 77% | 1.4 m/s | 5.2 |
| 2023 | 21.6°C | 17.4°C | 13.1°C | 25.6°C | 7.0°C | 99 mm | 80% | 1.5 m/s | 5 |
| 2022 | 22.1°C | 18.0°C | 14.0°C | 26.1°C | 10.5°C | 87 mm | 83% | 1.3 m/s | 5.3 |
| 2021 🔥 | 23.9°C | 20.0°C | 16.0°C | 28.4°C | 12.5°C | 87 mm | 84% | 1.4 m/s | 5.1 |
| 2020 | 22.0°C | 18.2°C | 14.4°C | 25.9°C | 10.9°C | 91 mm | 85% | 1.5 m/s | 4.9 |
| 2019 | 21.4°C | 17.2°C | 13.0°C | 24.6°C | 10.2°C | 57 mm | 82% | 1.5 m/s | 5.6 |
| 2018 | 23.7°C | 19.3°C | 14.9°C | 27.2°C | 8.9°C | 78 mm | 81% | 1.3 m/s | 4.7 |
| 2017 | 20.4°C | 16.7°C | 13.0°C | 25.1°C | 8.2°C | 127 mm | 85% | 1.4 m/s | 4.6 |
| 2016 | 23.7°C | 19.9°C | 16.0°C | 28.0°C | 11.6°C | 108 mm | 81% | 1.4 m/s | 4.9 |
| 2015 | 21.0°C | 17.2°C | 13.4°C | 27.0°C | 9.5°C | 66 mm | 86% | 1.4 m/s | 4.4 |
| 2014 | 20.6°C | 16.4°C | 12.3°C | 25.4°C | 8.8°C | 84 mm | 85% | 1.3 m/s | 4.7 |
| 2013 | 21.4°C | 17.3°C | 13.1°C | 27.0°C | 9.3°C | 101 mm | 85% | 1.4 m/s | 5.2 |
| 2012 | 23.8°C | 19.2°C | 14.6°C | 29.7°C | 9.8°C | 59 mm | 73% | 1.6 m/s | 5.2 |
| 2011 | 22.7°C | 18.2°C | 13.8°C | 27.3°C | 10.7°C | 72 mm | 81% | 1.3 m/s | 5.3 |
| 2010 | 23.8°C | 19.7°C | 15.5°C | 28.3°C | 10.7°C | 108 mm | 80% | 1.4 m/s | 4.8 |
| 2009 | 19.9°C | 15.8°C | 11.8°C | 26.2°C | 7.5°C | 111 mm | 85% | 1.4 m/s | 4.5 |
| 2008 | 21.7°C | 17.2°C | 12.6°C | 24.9°C | 9.1°C | 42 mm | 81% | 1.4 m/s | 5.9 |
| 2007 | 23.5°C | 18.6°C | 13.7°C | 30.8°C | 8.0°C | 35 mm | 72% | 1.4 m/s | 5.4 |
| 2006 | 22.9°C | 18.1°C | 13.3°C | 29.5°C | 8.7°C | 62 mm | 72% | 1.4 m/s | 5.3 |
| 2005 | 23.1°C | 18.7°C | 14.3°C | 28.8°C | 10.2°C | 87 mm | 78% | 1.4 m/s | 5.2 |
| 2004 | 19.0°C | 15.0°C | 10.9°C | 24.5°C | 6.9°C | 88 mm | 85% | 1.5 m/s | 5 |
| 2003 | 21.9°C | 17.5°C | 13.0°C | 26.5°C | 8.0°C | 79 mm | 83% | 1.3 m/s | 5.2 |
| 2002 | 21.3°C | 17.2°C | 13.1°C | 25.2°C | 9.1°C | 101 mm | 85% | 1.3 m/s | 5.4 |
| 2001 | 22.3°C | 17.9°C | 13.4°C | 27.4°C | 8.1°C | 112 mm | 83% | 1.3 m/s | 5.1 |
| 2000 | 21.6°C | 17.2°C | 12.8°C | 27.7°C | 8.4°C | 71 mm | 80% | 1.4 m/s | 5.1 |
| 1999 | 21.3°C | 16.8°C | 12.3°C | 26.8°C | 7.9°C | 75 mm | 78% | 1.4 m/s | 5.1 |
| 1998 | 23.9°C | 19.5°C | 15.1°C | 28.6°C | 9.4°C | 85 mm | 78% | 1.4 m/s | 5.1 |
| 1997 | 19.0°C | 14.9°C | 10.9°C | 23.1°C | 7.3°C | 79 mm | 85% | 1.3 m/s | 4.9 |
| 1996 | 20.4°C | 15.7°C | 10.9°C | 24.4°C | 7.9°C | 52 mm | 85% | 1.1 m/s | 5.6 |
| 1995 | 22.9°C | 18.7°C | 14.4°C | 28.4°C | 10.3°C | 124 mm | 82% | 1.3 m/s | 4.7 |
| 1994 | 19.4°C | 15.1°C | 10.8°C | 24.3°C | 6.8°C | 114 mm | 84% | 1.3 m/s | 4.9 |
| 1993 | 21.9°C | 17.5°C | 13.1°C | 27.7°C | 8.3°C | 87 mm | 85% | 1.1 m/s | 4.6 |
| 1992 | 20.1°C | 15.4°C | 10.6°C | 26.2°C | 7.8°C | 56 mm | 77% | 1.4 m/s | 5 |
| 1991 | 23.4°C | 18.3°C | 13.2°C | 29.6°C | 8.8°C | 41 mm | 76% | 1.2 m/s | 5.4 |
| 1990 | 21.3°C | 16.6°C | 11.9°C | 25.8°C | 8.2°C | 61 mm | 81% | 1.1 m/s | 4.7 |
| 1989 | 21.3°C | 16.5°C | 11.7°C | 26.3°C | 7.3°C | 81 mm | 81% | 1.1 m/s | 4.6 |
| 1988 🌧️ | 22.5°C | 17.9°C | 13.3°C | 30.7°C | 8.1°C | 141 mm | 80% | 1.3 m/s | 4.4 |
| 1987 | 21.1°C | 16.8°C | 12.5°C | 26.7°C | 7.8°C | 115 mm | 78% | 1.4 m/s | 4.5 |
| 1986 | 18.8°C | 14.7°C | 10.5°C | 23.6°C | 6.0°C | 90 mm | 83% | 1.3 m/s | 4.7 |
| 1985 | 19.6°C | 15.4°C | 11.2°C | 24.3°C | 6.6°C | 105 mm | 83% | 1.2 m/s | 4.6 |
| 1984 | 22.5°C | 17.6°C | 12.7°C | 26.4°C | 8.2°C | 93 mm | 81% | 1 m/s | 4.5 |
| 1983 | 23.5°C | 18.8°C | 14.2°C | 28.6°C | 9.7°C | 92 mm | 82% | 1.1 m/s | — |
| 1982 ❄️ | 18.9°C | 14.1°C | 9.4°C | 24.8°C | 3.0°C | 96 mm | 80% | 1.1 m/s | — |
| 1981 | 23.7°C | 18.8°C | 13.9°C | 28.0°C | 9.4°C | 69 mm | 76% | 1.1 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 21.8°C with lows near 13.1°C (mean 17.5°C), based on 45 years of NASA POWER data.
August averages 85 mm of rainfall in Sault Ste. Marie, a relatively wet time of year. The wettest on record was 141 mm in 1988.
The hottest August reached 30.8°C in 2007. The coldest dipped to 3°C in 1982.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 1.6°C. Daytime highs moved from 21.6°C to 22.7°C and overnight lows from 12.3°C to 14.4°C over the same span.
August is one of the warmer months of the year in Sault Ste. Marie and a relatively wet time of year, so plan for around 21.8°C daytime highs and 13.1°C at night.
Not quite — August is the 12th coolest month in Sault Ste. Marie, averaging 17.5°C.
For August in Sault Ste. Marie, pack light layers you can adjust through the day, with typical highs of 21.8°C and lows of 13.1°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 81% — quite humid.
Average wind speed in August is 1.3 m/s. The windiest August on record averaged 1.6 m/s (2012).
The wettest August on record was 1988 with 141 mm. On average, August sees 85 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 Sault Ste. Marie behaves each August, 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 August specifically, along with year-by-year records and how the month has changed over the decades.
