August is one of the cooler months of the year in Streaky Bay, with average highs near 17°C and lows around 9.9°C (mean 13.5°C). It is a relatively wet time of year, averaging 38 mm of rainfall and 71% relative humidity across the period.
August is one of the cooler months of the year in Streaky Bay. Across 45 years of records, the warmest August in Streaky Bay was 2024 — when the month averaged 15.4°C — while the coldest was 1989 at 11.8°C. Typical August days reach 17°C with nights near 9.9°C. The long-term trend is warming, about 0.2°C per decade.
August is a relatively wet time of year in Streaky Bay, averaging 38 mm of rainfall. The wettest August on record was 1985 with 101 mm, while the driest was 2024 at 3 mm.
Relative humidity in Streaky Bay during August averages 71%. The most humid August was 2013 at 76%, and the least humid was 1982 at 62%.
August receives about 3.9 kWh/m²/day of solar energy in Streaky Bay. The sunniest August was 2007 at 4.3 kWh/m²/day, and the cloudiest were 2003 and 2015 at 3.5.
Average wind speed in Streaky Bay during August is 4.2 m/s. The windiest August was 1984 at 5.4 m/s, while the calmest was 2014 at 3.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 13.0°C | 13.3°C | 13.4°C | 13.5°C | 14.1°C | +1.1°C |
| Avg High | 16.5°C | 16.8°C | 17.1°C | 17.0°C | 17.8°C | +1.3°C |
| Avg Low | 9.6°C | 9.7°C | 9.8°C | 10.1°C | 10.5°C | +0.9°C |
| Avg Rain | 48 mm | 45 mm | 45 mm | 29 mm | 16 mm | -32 mm |
August temperatures in Streaky Bay have risen by about 0.9°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 4.3°C (1999) to a record high of 27.1°C (2024).
Rainfall in August is a relatively wet time of year, averaging 38 mm, with a wettest year of 101 mm.
A quieter season to visit Streaky Bay
If your dates are flexible, the more temperate months of January and February tend to be the most comfortable for visiting Streaky Bay. That said, August — with days averaging 17°C and nights around 9.9°C (mean 13.5°C) and moderate rainfall (38 mm) — can still be rewarding for travellers who don't mind the cooler conditions, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 17.5°C | 13.8°C | 10.2°C | 22.6°C | 6.8°C | 10 mm | 67% | 4.7 m/s | 3.9 |
| 2024 🔥 | 19.2°C | 15.4°C | 11.5°C | 27.1°C | 7.2°C | 3 mm | 69% | 4.2 m/s | 3.9 |
| 2023 | 18.8°C | 14.7°C | 10.5°C | 26.1°C | 6.6°C | 5 mm | 69% | 3.6 m/s | 3.9 |
| 2022 | 16.7°C | 13.6°C | 10.4°C | 22.6°C | 6.4°C | 42 mm | 70% | 4.8 m/s | 3.7 |
| 2021 | 17.5°C | 13.9°C | 10.3°C | 23.4°C | 6.8°C | 12 mm | 70% | 3.9 m/s | 4.1 |
| 2020 | 16.9°C | 13.4°C | 10.0°C | 24.7°C | 6.2°C | 26 mm | 71% | 4.5 m/s | 3.8 |
| 2019 | 17.0°C | 13.3°C | 9.6°C | 23.0°C | 6.0°C | 9 mm | 67% | 4.2 m/s | 3.8 |
| 2018 | 17.5°C | 14.1°C | 10.6°C | 25.2°C | 6.2°C | 30 mm | 66% | 5.1 m/s | 3.6 |
| 2017 | 17.2°C | 13.8°C | 10.4°C | 23.0°C | 6.0°C | 21 mm | 67% | 4.8 m/s | 3.8 |
| 2016 | 17.8°C | 13.8°C | 9.9°C | 23.6°C | 6.7°C | 7 mm | 67% | 4.1 m/s | 3.9 |
| 2015 | 16.4°C | 13.1°C | 9.7°C | 21.1°C | 6.5°C | 21 mm | 74% | 3.9 m/s | 3.5 |
| 2014 | 17.0°C | 12.8°C | 8.7°C | 23.0°C | 5.6°C | 3 mm | 71% | 3.2 m/s | 4.1 |
| 2013 | 17.5°C | 14.3°C | 11.1°C | 22.8°C | 7.4°C | 47 mm | 76% | 4.4 m/s | 3.8 |
| 2012 | 16.5°C | 13.1°C | 9.8°C | 21.5°C | 4.8°C | 24 mm | 72% | 4.2 m/s | 3.9 |
| 2011 | 17.7°C | 14.3°C | 10.9°C | 22.2°C | 7.9°C | 59 mm | 75% | 3.7 m/s | 4 |
| 2010 | 15.1°C | 12.6°C | 10.0°C | 19.9°C | 6.3°C | 70 mm | 74% | 4.5 m/s | 3.6 |
| 2009 | 17.9°C | 14.3°C | 10.7°C | 22.5°C | 5.9°C | 16 mm | 75% | 4.2 m/s | 4 |
| 2008 | 15.2°C | 12.3°C | 9.4°C | 21.2°C | 5.8°C | 44 mm | 71% | 4 m/s | 3.9 |
| 2007 | 18.3°C | 14.0°C | 9.8°C | 26.5°C | 6.1°C | 13 mm | 68% | 4 m/s | 4.3 |
| 2006 | 18.6°C | 14.0°C | 9.5°C | 23.4°C | 7.1°C | 6 mm | 69% | 3.4 m/s | 4.1 |
| 2005 | 17.4°C | 13.8°C | 10.2°C | 23.9°C | 6.7°C | 35 mm | 70% | 4.4 m/s | 3.7 |
| 2004 | 16.9°C | 13.4°C | 10.0°C | 24.2°C | 7.2°C | 80 mm | 75% | 4.4 m/s | 3.9 |
| 2003 | 16.0°C | 12.7°C | 9.3°C | 20.0°C | 5.6°C | 100 mm | 73% | 4.8 m/s | 3.5 |
| 2002 | 17.3°C | 13.2°C | 9.1°C | 23.0°C | 5.2°C | 20 mm | 67% | 4.1 m/s | 3.9 |
| 2001 | 17.3°C | 13.9°C | 10.5°C | 23.8°C | 6.1°C | 61 mm | 69% | 4.7 m/s | 3.7 |
| 2000 | 16.1°C | 12.8°C | 9.6°C | 21.3°C | 7.2°C | 78 mm | 75% | 4.2 m/s | 3.7 |
| 1999 | 18.4°C | 13.9°C | 9.4°C | 24.4°C | 4.3°C | 29 mm | 66% | 4.1 m/s | 3.8 |
| 1998 | 17.8°C | 13.8°C | 9.8°C | 23.7°C | 6.7°C | 17 mm | 74% | 3.8 m/s | 3.9 |
| 1997 | 16.2°C | 12.9°C | 9.5°C | 21.4°C | 5.6°C | 57 mm | 69% | 4 m/s | 3.7 |
| 1996 | 15.9°C | 12.9°C | 9.9°C | 20.7°C | 6.1°C | 73 mm | 75% | 4 m/s | 3.8 |
| 1995 | 17.7°C | 13.7°C | 9.7°C | 24.7°C | 6.1°C | 18 mm | 72% | 3.7 m/s | 4.1 |
| 1994 | 16.8°C | 12.9°C | 8.9°C | 23.1°C | 5.2°C | 12 mm | 67% | 3.7 m/s | 4.2 |
| 1993 | 18.3°C | 14.2°C | 10.2°C | 24.3°C | 6.3°C | 51 mm | 67% | 4.2 m/s | 3.9 |
| 1992 | 15.8°C | 12.6°C | 9.4°C | 19.7°C | 6.0°C | 97 mm | 72% | 5 m/s | 3.7 |
| 1991 | 16.0°C | 13.3°C | 10.7°C | 19.9°C | 7.1°C | 52 mm | 71% | 5.1 m/s | 3.7 |
| 1990 | 15.4°C | 12.6°C | 9.9°C | 20.3°C | 6.4°C | 50 mm | 74% | 4.8 m/s | 3.7 |
| 1989 ❄️ | 14.6°C | 11.8°C | 8.9°C | 19.4°C | 4.5°C | 43 mm | 76% | 4.3 m/s | 3.9 |
| 1988 | 16.6°C | 13.1°C | 9.5°C | 21.0°C | 5.0°C | 16 mm | 68% | 4.3 m/s | 3.9 |
| 1987 | 16.0°C | 12.7°C | 9.3°C | 22.4°C | 6.4°C | 30 mm | 73% | 3.7 m/s | 4 |
| 1986 | 15.7°C | 12.6°C | 9.6°C | 21.1°C | 6.2°C | 53 mm | 75% | 4.3 m/s | 3.8 |
| 1985 🌧️ | 16.1°C | 13.0°C | 9.9°C | 24.4°C | 6.3°C | 101 mm | 76% | 4.5 m/s | 3.8 |
| 1984 | 15.9°C | 12.7°C | 9.5°C | 20.2°C | 5.6°C | 80 mm | 74% | 5.4 m/s | 3.9 |
| 1983 | 17.2°C | 13.3°C | 9.4°C | 22.9°C | 5.2°C | 34 mm | 72% | 3.8 m/s | — |
| 1982 | 19.9°C | 14.9°C | 9.9°C | 24.8°C | 5.6°C | 7 mm | 62% | 3.5 m/s | — |
| 1981 | 16.1°C | 13.1°C | 10.1°C | 20.7°C | 5.7°C | 68 mm | 75% | 4.9 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 17°C with lows near 9.9°C (mean 13.5°C), based on 45 years of NASA POWER data.
August averages 38 mm of rainfall in Streaky Bay, a relatively wet time of year. The wettest on record was 101 mm in 1985.
The hottest August reached 27.1°C in 2024. The coldest dipped to 4.3°C in 1999.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 0.9°C. Daytime highs moved from 17°C to 17.9°C and overnight lows from 9.8°C to 10.6°C over the same span.
August is one of the cooler months of the year in Streaky Bay and a relatively wet time of year, so plan for around 17°C daytime highs and 9.9°C at night.
Not quite — August is the 2nd coolest month in Streaky Bay, averaging 13.5°C.
For August in Streaky Bay, pack light layers you can adjust through the day, with typical highs of 17°C and lows of 9.9°C.
Relative humidity in August averages 71% — moderately humid.
Average wind speed in August is 4.2 m/s. The windiest August on record averaged 5.4 m/s (1984).
The wettest August on record was 1985 with 101 mm. On average, August sees 38 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 Streaky Bay 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.
