May is one of the cooler months of the year in Warrnambool, with average highs near 15.8°C and lows around 11.7°C (mean 13.8°C). It is about average for rainfall, averaging 68 mm of rainfall and 78% relative humidity across the period.
May is one of the cooler months of the year in Warrnambool. Across 45 years of records, the warmest May in Warrnambool was 2007 — when the month averaged 15.3°C — while the coldest was 1995 at 12.5°C. Typical May days reach 15.8°C with nights near 11.7°C. The long-term May temperature trend is broadly flat.
May is about average for rainfall in Warrnambool, averaging 68 mm of rainfall. The wettest May on record was 1987 with 142 mm, while the driest was 1996 at 18 mm.
Relative humidity in Warrnambool during May averages 78%. The most humid May was 1983 at 84%, and the least humid was 2025 at 70%.
May receives about 2.2 kWh/m²/day of solar energy in Warrnambool. The sunniest Mays were 2024 and 2025 at 2.5 kWh/m²/day, and the cloudiest was 1997 at 1.8.
Average wind speed in Warrnambool during May is 5.1 m/s. The windiest May was 1994 at 7 m/s, while the calmest was 1991 at 3.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 13.7°C | 13.4°C | 13.9°C | 13.9°C | 13.8°C | +0.1°C |
| Avg High | 15.9°C | 15.4°C | 15.9°C | 15.8°C | 15.9°C | 0°C |
| Avg Low | 11.5°C | 11.4°C | 11.9°C | 12.0°C | 11.7°C | +0.2°C |
| Avg Rain | 85 mm | 55 mm | 66 mm | 78 mm | 48 mm | -37 mm |
May temperatures in Warrnambool have risen by about 0.6°C between 1981–1985 and 2021–2025.
May has ranged from a record low of 6.2°C (1983) to a record high of 23.7°C (2025).
Rainfall in May is about average for rainfall, averaging 68 mm, with a wettest year of 142 mm.
A good time to visit Warrnambool
May is a good time to visit Warrnambool, with days averaging 15.8°C and nights around 11.7°C (mean 13.8°C, close to Warrnambool's yearly average) and moderate rainfall. February and January 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 | 17.1°C | 14.8°C | 12.5°C | 23.7°C | 9.1°C | 26 mm | 70% | 4.7 m/s | 2.5 |
| 2024 | 16.0°C | 13.9°C | 11.8°C | 19.0°C | 8.4°C | 24 mm | 78% | 4.2 m/s | 2.5 |
| 2023 | 15.4°C | 13.7°C | 12.1°C | 19.4°C | 9.7°C | 59 mm | 76% | 5.8 m/s | 2.2 |
| 2022 | 15.8°C | 13.9°C | 11.9°C | 20.6°C | 8.4°C | 49 mm | 77% | 5 m/s | 2.3 |
| 2021 | 15.8°C | 13.6°C | 11.3°C | 20.8°C | 7.5°C | 63 mm | 75% | 5.7 m/s | 2.3 |
| 2020 | 15.0°C | 12.9°C | 10.8°C | 19.2°C | 8.1°C | 68 mm | 77% | 5.7 m/s | 2.3 |
| 2019 | 16.3°C | 14.2°C | 12.2°C | 20.9°C | 9.7°C | 94 mm | 77% | 5.9 m/s | 2.3 |
| 2018 | 16.0°C | 14.3°C | 12.6°C | 21.2°C | 9.1°C | 82 mm | 75% | 6.2 m/s | 2 |
| 2017 | 15.4°C | 13.5°C | 11.6°C | 19.6°C | 10.0°C | 50 mm | 78% | 4.8 m/s | 2.1 |
| 2016 | 16.5°C | 14.5°C | 12.5°C | 20.3°C | 7.8°C | 70 mm | 75% | 6.7 m/s | 2.2 |
| 2015 | 15.5°C | 13.4°C | 11.3°C | 20.6°C | 8.6°C | 77 mm | 77% | 6.7 m/s | 2.2 |
| 2014 | 16.6°C | 14.5°C | 12.5°C | 21.3°C | 8.8°C | 70 mm | 80% | 4.9 m/s | 2.1 |
| 2013 | 16.5°C | 14.4°C | 12.2°C | 23.3°C | 9.9°C | 115 mm | 75% | 5.2 m/s | 2.2 |
| 2012 | 15.6°C | 13.9°C | 12.3°C | 20.5°C | 9.3°C | 86 mm | 76% | 5.7 m/s | 2.2 |
| 2011 | 14.2°C | 12.8°C | 11.4°C | 18.9°C | 8.5°C | 77 mm | 77% | 4.6 m/s | 2 |
| 2010 | 15.8°C | 13.7°C | 11.6°C | 21.0°C | 7.9°C | 57 mm | 79% | 4.4 m/s | 2.2 |
| 2009 | 15.7°C | 13.9°C | 12.1°C | 19.4°C | 8.7°C | 52 mm | 80% | 4.5 m/s | 2.1 |
| 2008 | 15.8°C | 13.8°C | 11.7°C | 19.9°C | 9.0°C | 56 mm | 78% | 4.5 m/s | 2.2 |
| 2007 🔥 | 17.5°C | 15.3°C | 13.2°C | 21.4°C | 10.9°C | 126 mm | 78% | 6.5 m/s | 2.1 |
| 2006 | 14.5°C | 12.8°C | 11.1°C | 17.2°C | 7.5°C | 68 mm | 79% | 5 m/s | 2 |
| 2005 | 15.9°C | 13.9°C | 12.0°C | 22.8°C | 10.1°C | 26 mm | 76% | 4.8 m/s | 2.2 |
| 2004 | 15.2°C | 13.3°C | 11.3°C | 18.3°C | 8.7°C | 59 mm | 79% | 5.8 m/s | 2.3 |
| 2003 | 16.2°C | 13.8°C | 11.4°C | 19.7°C | 8.0°C | 30 mm | 79% | 4.1 m/s | 2.4 |
| 2002 | 16.7°C | 14.5°C | 12.3°C | 23.6°C | 9.2°C | 70 mm | 76% | 4.6 m/s | 2.3 |
| 2001 | 15.7°C | 13.9°C | 12.0°C | 21.5°C | 9.6°C | 45 mm | 80% | 4.2 m/s | 2.2 |
| 2000 | 15.5°C | 13.7°C | 11.9°C | 19.5°C | 6.8°C | 131 mm | 78% | 6.4 m/s | 2.1 |
| 1999 | 16.7°C | 14.4°C | 12.1°C | 21.2°C | 9.0°C | 66 mm | 76% | 5.7 m/s | 2 |
| 1998 | 15.2°C | 13.3°C | 11.5°C | 20.5°C | 8.2°C | 45 mm | 78% | 4.8 m/s | 1.9 |
| 1997 | 14.9°C | 13.2°C | 11.5°C | 20.2°C | 9.6°C | 108 mm | 80% | 4.4 m/s | 1.8 |
| 1996 | 15.7°C | 13.5°C | 11.2°C | 21.8°C | 8.1°C | 18 mm | 78% | 4.3 m/s | 2.1 |
| 1995 ❄️ | 14.4°C | 12.5°C | 10.7°C | 18.6°C | 8.0°C | 46 mm | 82% | 4.7 m/s | 2.2 |
| 1994 | 15.4°C | 13.5°C | 11.5°C | 20.7°C | 8.4°C | 99 mm | 75% | 7 m/s | 2.1 |
| 1993 | 15.6°C | 13.4°C | 11.3°C | 20.0°C | 8.8°C | 39 mm | 78% | 4.7 m/s | 2.2 |
| 1992 | 14.7°C | 12.9°C | 11.1°C | 20.2°C | 7.4°C | 74 mm | 81% | 4.2 m/s | 2.2 |
| 1991 | 15.6°C | 13.4°C | 11.3°C | 19.0°C | 8.4°C | 27 mm | 80% | 3.9 m/s | 2.2 |
| 1990 | 15.8°C | 13.7°C | 11.6°C | 22.1°C | 7.9°C | 30 mm | 76% | 5.1 m/s | 2.3 |
| 1989 | 16.2°C | 14.2°C | 12.1°C | 20.2°C | 8.5°C | 76 mm | 81% | 5 m/s | 2.2 |
| 1988 | 17.2°C | 15.0°C | 12.7°C | 23.5°C | 9.2°C | 69 mm | 80% | 4.2 m/s | 2.1 |
| 1987 🌧️ | 15.4°C | 13.4°C | 11.4°C | 20.0°C | 8.9°C | 142 mm | 80% | 5.5 m/s | 2.1 |
| 1986 | 15.4°C | 13.4°C | 11.5°C | 19.6°C | 9.4°C | 95 mm | 80% | 4.5 m/s | 2 |
| 1985 | 15.9°C | 13.6°C | 11.4°C | 22.1°C | 8.5°C | 63 mm | 77% | 4.8 m/s | 2.3 |
| 1984 | 16.1°C | 13.4°C | 10.7°C | 20.7°C | 8.5°C | 58 mm | 77% | 4.8 m/s | 2.4 |
| 1983 | 15.3°C | 13.0°C | 10.7°C | 17.5°C | 6.2°C | 103 mm | 84% | 5.1 m/s | — |
| 1982 | 15.4°C | 13.4°C | 11.4°C | 19.7°C | 9.1°C | 83 mm | 73% | 6.1 m/s | — |
| 1981 | 16.2°C | 13.8°C | 11.3°C | 22.4°C | 8.2°C | 74 mm | 75% | 5.1 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 15.8°C with lows near 11.7°C (mean 13.8°C), based on 45 years of NASA POWER data.
May averages 68 mm of rainfall in Warrnambool, about average for rainfall. The wettest on record was 142 mm in 1987.
The hottest May reached 23.7°C in 2025. The coldest dipped to 6.2°C in 1983.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 0.6°C. Daytime highs moved from 15.8°C to 16°C and overnight lows from 11.1°C to 11.9°C over the same span.
May is one of the cooler months of the year in Warrnambool and about average for rainfall, so plan for around 15.8°C daytime highs and 11.7°C at night.
Not quite — May is the 6th coolest month in Warrnambool, averaging 13.8°C.
For May in Warrnambool, pack light layers you can adjust through the day, with typical highs of 15.8°C and lows of 11.7°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 78% — quite humid.
Average wind speed in May is 5.1 m/s. The windiest May on record averaged 7 m/s (1994).
The wettest May on record was 1987 with 142 mm. On average, May sees 68 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 Warrnambool 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.
