May is one of the cooler months of the year in Swan Hill, with average highs near 18.9°C and lows around 7.6°C (mean 13.3°C). It is about average for rainfall, averaging 28 mm of rainfall and 70% relative humidity across the period.
May is one of the cooler months of the year in Swan Hill. Across 45 years of records, the warmest Mays in Swan Hill were 1988, 2007 and 2014 — when the month averaged 14.8°C — while the coldest were 2011 and 2020 at 11.8°C. Typical May days reach 18.9°C with nights near 7.6°C. The long-term May temperature trend is broadly flat.
May is about average for rainfall in Swan Hill, averaging 28 mm of rainfall. The wettest May on record was 1988 with 85 mm, while the driest were 1991 and 2025 at 3 mm.
Relative humidity in Swan Hill during May averages 70%. The most humid May was 1989 at 81%, and the least humid was 2005 at 58%.
May receives about 2.9 kWh/m²/day of solar energy in Swan Hill. The sunniest Mays were 2005 and 2025 at 3.3 kWh/m²/day, and the cloudiest was 1988 at 2.5.
Average wind speed in Swan Hill during May is 2.5 m/s. The windiest May was 1994 at 3.2 m/s, while the calmest was 2008 at 2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 13.2°C | 13.2°C | 13.2°C | 13.4°C | 13.1°C | -0.1°C |
| Avg High | 18.7°C | 18.8°C | 19.1°C | 18.9°C | 18.9°C | +0.2°C |
| Avg Low | 7.7°C | 7.5°C | 7.5°C | 7.8°C | 7.3°C | -0.4°C |
| Avg Rain | 43 mm | 31 mm | 21 mm | 26 mm | 12 mm | -31 mm |
May temperatures in Swan Hill have risen by about 0.4°C between 1981–1985 and 2021–2025.
May has ranged from a record low of 0.8°C (1997) to a record high of 29.7°C (1997).
Rainfall in May is about average for rainfall, averaging 28 mm, with a wettest year of 85 mm.
A good time to visit Swan Hill
May is a good time to visit Swan Hill, with days averaging 18.9°C and nights around 7.6°C (mean 13.3°C, cooler than Swan Hill's yearly average) and low rainfall. March and December are marginally more temperate, but May still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 20.5°C | 14.2°C | 7.9°C | 26.8°C | 3.7°C | 3 mm | 63% | 2.5 m/s | 3.3 |
| 2024 | 19.8°C | 13.8°C | 7.7°C | 22.6°C | 2.6°C | 19 mm | 69% | 2.1 m/s | 3.1 |
| 2023 | 18.0°C | 12.4°C | 6.8°C | 23.2°C | 3.2°C | 10 mm | 69% | 2.6 m/s | 2.9 |
| 2022 | 18.1°C | 13.0°C | 8.0°C | 22.6°C | 4.0°C | 14 mm | 76% | 2.4 m/s | 2.8 |
| 2021 | 19.6°C | 13.5°C | 7.4°C | 27.4°C | 0.9°C | 14 mm | 66% | 2.8 m/s | 3 |
| 2020 | 17.5°C | 11.8°C | 6.2°C | 25.0°C | 2.4°C | 12 mm | 74% | 2.8 m/s | 3 |
| 2019 | 19.4°C | 13.7°C | 8.0°C | 24.8°C | 3.5°C | 27 mm | 68% | 3 m/s | 2.9 |
| 2018 | 19.4°C | 13.7°C | 8.0°C | 27.2°C | 3.9°C | 15 mm | 67% | 3.1 m/s | 2.8 |
| 2017 | 18.8°C | 13.0°C | 7.2°C | 22.5°C | 3.1°C | 16 mm | 71% | 2.4 m/s | 3.1 |
| 2016 | 19.5°C | 14.1°C | 8.8°C | 26.8°C | 1.9°C | 27 mm | 70% | 3.1 m/s | 2.8 |
| 2015 | 18.7°C | 13.3°C | 7.8°C | 23.4°C | 2.8°C | 21 mm | 73% | 3.1 m/s | 2.9 |
| 2014 | 20.0°C | 14.8°C | 9.5°C | 25.7°C | 3.6°C | 41 mm | 74% | 2.5 m/s | 2.7 |
| 2013 | 19.0°C | 13.4°C | 7.7°C | 26.1°C | 4.1°C | 25 mm | 69% | 2.5 m/s | 2.9 |
| 2012 | 18.7°C | 12.7°C | 6.8°C | 25.4°C | 3.7°C | 15 mm | 69% | 2.6 m/s | 3.1 |
| 2011 ❄️ | 17.2°C | 11.8°C | 6.4°C | 24.0°C | 2.8°C | 17 mm | 75% | 2.5 m/s | 2.7 |
| 2010 | 18.6°C | 13.3°C | 7.9°C | 25.2°C | 2.9°C | 60 mm | 74% | 2.2 m/s | 2.9 |
| 2009 | 19.1°C | 13.4°C | 7.8°C | 22.6°C | 5.1°C | 20 mm | 74% | 2.6 m/s | 3 |
| 2008 | 18.7°C | 12.7°C | 6.8°C | 23.4°C | 3.8°C | 17 mm | 72% | 2 m/s | 2.9 |
| 2007 | 20.3°C | 14.8°C | 9.4°C | 25.1°C | 4.6°C | 48 mm | 72% | 3 m/s | 2.8 |
| 2006 | 17.7°C | 11.9°C | 6.0°C | 22.3°C | 2.3°C | 9 mm | 73% | 2.4 m/s | 3 |
| 2005 | 21.2°C | 14.5°C | 7.9°C | 27.9°C | 3.2°C | 3 mm | 58% | 2.2 m/s | 3.3 |
| 2004 | 18.4°C | 12.3°C | 6.3°C | 22.4°C | 3.0°C | 17 mm | 68% | 2.7 m/s | 3.1 |
| 2003 | 19.6°C | 13.7°C | 7.9°C | 24.7°C | 2.8°C | 28 mm | 68% | 2.3 m/s | 2.9 |
| 2002 | 19.8°C | 13.8°C | 7.9°C | 27.9°C | 4.3°C | 20 mm | 63% | 2.3 m/s | 3 |
| 2001 | 18.7°C | 13.3°C | 7.9°C | 27.2°C | 4.0°C | 9 mm | 70% | 2.2 m/s | 2.9 |
| 2000 | 17.4°C | 12.0°C | 6.7°C | 22.6°C | 2.1°C | 39 mm | 74% | 2.8 m/s | 2.9 |
| 1999 | 19.8°C | 13.8°C | 7.7°C | 25.3°C | 1.2°C | 49 mm | 61% | 2.5 m/s | 2.9 |
| 1998 | 18.5°C | 12.9°C | 7.3°C | 24.3°C | 2.8°C | 14 mm | 72% | 2.4 m/s | 2.9 |
| 1997 | 18.7°C | 13.3°C | 7.9°C | 29.7°C | 0.8°C | 44 mm | 70% | 2.5 m/s | 2.7 |
| 1996 | 19.3°C | 13.3°C | 7.2°C | 25.6°C | 2.8°C | 9 mm | 71% | 2.3 m/s | 3 |
| 1995 | 17.6°C | 12.6°C | 7.6°C | 25.2°C | 3.3°C | 58 mm | 76% | 2.5 m/s | 2.9 |
| 1994 | 19.1°C | 13.4°C | 7.6°C | 25.7°C | 2.8°C | 8 mm | 63% | 3.2 m/s | 3.1 |
| 1993 | 19.5°C | 13.6°C | 7.7°C | 27.0°C | 2.3°C | 17 mm | 67% | 2.2 m/s | 3 |
| 1992 | 17.9°C | 12.6°C | 7.2°C | 25.7°C | 2.9°C | 68 mm | 75% | 2.2 m/s | 2.8 |
| 1991 | 19.3°C | 13.1°C | 7.0°C | 24.5°C | 3.7°C | 3 mm | 71% | 2.1 m/s | 3.1 |
| 1990 | 18.4°C | 12.9°C | 7.4°C | 26.0°C | 2.7°C | 43 mm | 73% | 2.6 m/s | 2.8 |
| 1989 | 18.3°C | 13.5°C | 8.7°C | 23.3°C | 4.1°C | 61 mm | 81% | 2.5 m/s | 2.8 |
| 1988 🔥 🌧️ | 19.8°C | 14.8°C | 9.7°C | 27.2°C | 4.5°C | 85 mm | 77% | 2.4 m/s | 2.5 |
| 1987 | 18.0°C | 12.6°C | 7.2°C | 25.1°C | 2.8°C | 33 mm | 74% | 2.8 m/s | 2.8 |
| 1986 | 18.6°C | 13.0°C | 7.5°C | 23.0°C | 3.2°C | 46 mm | 73% | 2.4 m/s | 2.9 |
| 1985 | 19.3°C | 13.6°C | 7.8°C | 28.5°C | 3.1°C | 43 mm | 67% | 2.6 m/s | 3 |
| 1984 | 19.6°C | 13.3°C | 7.1°C | 25.5°C | 3.4°C | 4 mm | 63% | 2.2 m/s | 3.2 |
| 1983 | 17.9°C | 12.9°C | 7.9°C | 22.8°C | 2.3°C | 53 mm | 80% | 2.8 m/s | — |
| 1982 | 18.5°C | 12.5°C | 6.5°C | 25.0°C | 2.1°C | 16 mm | 64% | 2.6 m/s | — |
| 1981 | 18.4°C | 12.8°C | 7.1°C | 25.8°C | 1.6°C | 49 mm | 71% | 2.8 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 18.9°C with lows near 7.6°C (mean 13.3°C), based on 45 years of NASA POWER data.
May averages 28 mm of rainfall in Swan Hill, about average for rainfall. The wettest on record was 85 mm in 1988.
The hottest May reached 29.7°C in 1997. The coldest dipped to 0.8°C in 1997.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 0.4°C. Daytime highs moved from 18.7°C to 19.2°C and overnight lows from 7.3°C to 7.6°C over the same span.
May is one of the cooler months of the year in Swan Hill and about average for rainfall, so plan for around 18.9°C daytime highs and 7.6°C at night.
Not quite — May is the 5th coolest month in Swan Hill, averaging 13.3°C.
For May in Swan Hill, pack warm layers and a jacket for chilly mornings, with typical highs of 18.9°C and lows of 7.6°C.
Relative humidity in May averages 70% — moderately humid.
Average wind speed in May is 2.5 m/s. The windiest May on record averaged 3.2 m/s (1994).
The wettest May on record was 1988 with 85 mm. On average, May sees 28 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 May, 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 May specifically, along with year-by-year records and how the month has changed over the decades.
