August is one of the cooler months of the year in Swan Hill, with average highs near 16.4°C and lows around 4.9°C (mean 10.6°C). It is about average for rainfall, averaging 32 mm of rainfall and 73% relative humidity across the period.
August is one of the cooler months of the year in Swan Hill. Across 45 years of records, the warmest August in Swan Hill was 2024 — when the month averaged 13.6°C — while the coldest was 1989 at 8.6°C. Typical August days reach 16.4°C with nights near 4.9°C. The long-term trend is warming, about 0.3°C per decade.
August is about average for rainfall in Swan Hill, averaging 32 mm of rainfall. The wettest August on record was 1985 with 82 mm, while the driest was 2007 at 4 mm.
Relative humidity in Swan Hill during August averages 73%. The most humid August was 1989 at 85%, and the least humid was 1982 at 59%.
August receives about 3.5 kWh/m²/day of solar energy in Swan Hill. The sunniest Augusts were 2006 and 2007 at 3.9 kWh/m²/day, and the cloudiest were 2013, 2015 and 2022, among others at 3.2.
Average wind speed in Swan Hill during August is 2.8 m/s. The windiest August was 1991 at 3.7 m/s, while the calmest were 1982 and 2006 at 2.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 10.4°C | 10.3°C | 10.7°C | 10.5°C | 11.7°C | +1.3°C |
| Avg High | 15.8°C | 16.0°C | 16.8°C | 16.1°C | 17.6°C | +1.8°C |
| Avg Low | 4.9°C | 4.6°C | 4.6°C | 5.0°C | 5.8°C | +0.9°C |
| Avg Rain | 47 mm | 33 mm | 27 mm | 29 mm | 18 mm | -29 mm |
August temperatures in Swan Hill have risen by about 1.2°C between 1981–1985 and 2021–2025.
August has ranged from a record low of -0.8°C (2003) to a record high of 27.3°C (1982).
Rainfall in August is about average for rainfall, averaging 32 mm, with a wettest year of 82 mm.
A quieter season to visit Swan Hill
If your dates are flexible, the more temperate months of March and December tend to be the most comfortable for visiting Swan Hill. That said, August — with days averaging 16.4°C and nights around 4.9°C (mean 10.6°C) and moderate rainfall (32 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 | 17.2°C | 11.2°C | 5.1°C | 21.5°C | 0.7°C | 16 mm | 72% | 2.6 m/s | 3.5 |
| 2024 🔥 | 19.7°C | 13.6°C | 7.5°C | 25.7°C | 1.3°C | 8 mm | 67% | 2.7 m/s | 3.5 |
| 2023 | 17.9°C | 11.8°C | 5.7°C | 23.5°C | 1.7°C | 17 mm | 72% | 2.3 m/s | 3.3 |
| 2022 | 16.9°C | 11.5°C | 6.1°C | 22.3°C | 2.3°C | 34 mm | 74% | 2.9 m/s | 3.2 |
| 2021 | 17.6°C | 11.5°C | 5.4°C | 24.7°C | 2.2°C | 7 mm | 70% | 2.6 m/s | 3.6 |
| 2020 | 16.1°C | 10.5°C | 5.0°C | 22.5°C | 0.6°C | 26 mm | 73% | 2.9 m/s | 3.5 |
| 2019 | 16.0°C | 10.1°C | 4.1°C | 22.0°C | 0.9°C | 11 mm | 70% | 2.9 m/s | 3.5 |
| 2018 | 16.4°C | 10.6°C | 4.8°C | 21.7°C | 0.2°C | 11 mm | 64% | 3.3 m/s | 3.6 |
| 2017 | 15.9°C | 10.2°C | 4.6°C | 23.1°C | 0.4°C | 36 mm | 72% | 2.9 m/s | 3.4 |
| 2016 | 17.0°C | 11.1°C | 5.2°C | 23.3°C | 1.9°C | 34 mm | 71% | 2.6 m/s | 3.5 |
| 2015 | 15.2°C | 10.1°C | 5.0°C | 20.7°C | 0.7°C | 13 mm | 74% | 2.5 m/s | 3.2 |
| 2014 | 16.5°C | 10.5°C | 4.5°C | 22.0°C | 0.6°C | 5 mm | 74% | 2.3 m/s | 3.8 |
| 2013 | 16.3°C | 11.1°C | 6.0°C | 24.5°C | 2.2°C | 30 mm | 76% | 3 m/s | 3.2 |
| 2012 | 15.8°C | 10.4°C | 5.1°C | 22.3°C | 1.6°C | 24 mm | 73% | 3.2 m/s | 3.3 |
| 2011 | 17.7°C | 12.0°C | 6.4°C | 25.7°C | 2.3°C | 50 mm | 74% | 2.2 m/s | 3.4 |
| 2010 | 13.9°C | 9.2°C | 4.6°C | 18.0°C | 1.2°C | 74 mm | 82% | 3.1 m/s | 3.2 |
| 2009 | 18.0°C | 11.9°C | 5.8°C | 23.0°C | 1.0°C | 17 mm | 68% | 3.1 m/s | 3.5 |
| 2008 | 14.6°C | 9.3°C | 4.0°C | 20.0°C | 1.0°C | 34 mm | 76% | 2.8 m/s | 3.3 |
| 2007 | 18.2°C | 11.7°C | 5.3°C | 26.7°C | 1.5°C | 4 mm | 69% | 2.8 m/s | 3.9 |
| 2006 | 17.9°C | 11.2°C | 4.5°C | 24.4°C | 1.9°C | 5 mm | 69% | 2.1 m/s | 3.9 |
| 2005 | 17.2°C | 10.8°C | 4.5°C | 24.4°C | 0.4°C | 44 mm | 70% | 2.9 m/s | 3.7 |
| 2004 | 16.5°C | 10.7°C | 4.9°C | 25.5°C | 0.2°C | 38 mm | 70% | 2.5 m/s | 3.5 |
| 2003 | 15.0°C | 9.4°C | 3.8°C | 20.4°C | -0.8°C | 58 mm | 76% | 2.9 m/s | 3.3 |
| 2002 | 17.7°C | 11.1°C | 4.4°C | 22.8°C | 0.6°C | 13 mm | 65% | 2.5 m/s | 3.6 |
| 2001 | 17.1°C | 11.1°C | 5.1°C | 25.1°C | 1.9°C | 40 mm | 68% | 3.3 m/s | 3.4 |
| 2000 | 15.8°C | 9.9°C | 4.0°C | 19.8°C | 0.5°C | 21 mm | 75% | 2.2 m/s | 3.3 |
| 1999 | 17.3°C | 11.4°C | 5.5°C | 25.0°C | 0.7°C | 55 mm | 76% | 2.8 m/s | 3.6 |
| 1998 | 17.3°C | 11.4°C | 5.4°C | 21.9°C | 1.1°C | 17 mm | 73% | 2.2 m/s | 3.6 |
| 1997 | 15.6°C | 9.9°C | 4.2°C | 21.1°C | 0.0°C | 46 mm | 72% | 2.6 m/s | 3.3 |
| 1996 | 15.2°C | 10.0°C | 4.9°C | 20.9°C | 1.5°C | 43 mm | 79% | 2.8 m/s | 3.3 |
| 1995 | 16.7°C | 10.6°C | 4.5°C | 24.1°C | -0.1°C | 19 mm | 78% | 2.5 m/s | 3.7 |
| 1994 | 15.8°C | 9.4°C | 3.1°C | 23.7°C | 0.8°C | 4 mm | 70% | 2.4 m/s | 3.7 |
| 1993 | 18.3°C | 11.8°C | 5.4°C | 24.2°C | 0.3°C | 23 mm | 68% | 2.8 m/s | 3.6 |
| 1992 | 14.3°C | 9.1°C | 3.9°C | 20.3°C | 1.2°C | 60 mm | 76% | 3 m/s | 3.4 |
| 1991 | 15.5°C | 10.1°C | 4.8°C | 20.5°C | 0.3°C | 30 mm | 75% | 3.7 m/s | 3.4 |
| 1990 | 14.1°C | 9.3°C | 4.5°C | 17.4°C | -0.3°C | 35 mm | 81% | 3.3 m/s | 3.5 |
| 1989 ❄️ | 13.3°C | 8.6°C | 3.9°C | 17.5°C | 0.2°C | 57 mm | 85% | 2.6 m/s | 3.2 |
| 1988 | 16.5°C | 10.9°C | 5.2°C | 22.6°C | 0.9°C | 11 mm | 75% | 2.9 m/s | 3.5 |
| 1987 | 15.6°C | 10.5°C | 5.3°C | 20.0°C | 1.7°C | 48 mm | 79% | 2.7 m/s | 3.4 |
| 1986 | 15.3°C | 9.8°C | 4.4°C | 21.3°C | 0.5°C | 53 mm | 78% | 2.7 m/s | 3.5 |
| 1985 🌧️ | 15.3°C | 9.9°C | 4.4°C | 20.5°C | -0.7°C | 82 mm | 75% | 2.7 m/s | 3.2 |
| 1984 | 15.6°C | 10.5°C | 5.5°C | 19.9°C | 3.3°C | 69 mm | 77% | 3.3 m/s | 3.4 |
| 1983 | 16.0°C | 10.7°C | 5.4°C | 20.1°C | 1.1°C | 48 mm | 80% | 2.7 m/s | — |
| 1982 | 20.5°C | 13.0°C | 5.5°C | 27.3°C | 1.0°C | 5 mm | 59% | 2.1 m/s | — |
| 1981 | 14.4°C | 9.4°C | 4.3°C | 19.2°C | 0.2°C | 50 mm | 81% | 3.1 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 16.4°C with lows near 4.9°C (mean 10.6°C), based on 45 years of NASA POWER data.
August averages 32 mm of rainfall in Swan Hill, about average for rainfall. The wettest on record was 82 mm in 1985.
The hottest August reached 27.3°C in 1982. The coldest dipped to -0.8°C in 2003.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 1.2°C. Daytime highs moved from 16.4°C to 17.9°C and overnight lows from 5°C to 6°C over the same span.
August is one of the cooler months of the year in Swan Hill and about average for rainfall, so plan for around 16.4°C daytime highs and 4.9°C at night.
Not quite — August is the 3rd coolest month in Swan Hill, averaging 10.6°C.
For August in Swan Hill, pack warm layers and a jacket for chilly mornings, with typical highs of 16.4°C and lows of 4.9°C.
Relative humidity in August averages 73% — moderately humid.
Average wind speed in August is 2.8 m/s. The windiest August on record averaged 3.7 m/s (1991).
The wettest August on record was 1985 with 82 mm. On average, August sees 32 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 Swan Hill 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.
