May is one of the cooler months of the year in Mount Gambier, with average highs near 16.1°C and lows around 11°C (mean 13.6°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 Mount Gambier. Across 45 years of records, the warmest May in Mount Gambier was 2007 — when the month averaged 15.2°C — while the coldest was 2006 at 12.4°C. Typical May days reach 16.1°C with nights near 11°C. The long-term May temperature trend is broadly flat.
May is about average for rainfall in Mount Gambier, averaging 68 mm of rainfall. The wettest May on record was 1987 with 160 mm, while the driest was 2024 at 16 mm.
Relative humidity in Mount Gambier during May averages 78%. The most humid May was 1983 at 83%, and the least humid was 2025 at 71%.
May receives about 2.4 kWh/m²/day of solar energy in Mount Gambier. The sunniest May was 2024 at 2.8 kWh/m²/day, and the cloudiest was 1997 at 2.
Average wind speed in Mount Gambier during May is 3.7 m/s. The windiest May was 1994 at 5.1 m/s, while the calmest was 1991 at 2.8 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 13.5°C | 13.3°C | 13.7°C | 13.7°C | 13.6°C | +0.1°C |
| Avg High | 16.2°C | 15.8°C | 16.2°C | 16.1°C | 16.2°C | 0°C |
| Avg Low | 10.8°C | 10.7°C | 11.1°C | 11.3°C | 10.9°C | +0.1°C |
| Avg Rain | 87 mm | 56 mm | 68 mm | 73 mm | 51 mm | -36 mm |
May temperatures in Mount Gambier have risen by about 0.5°C between 1981–1985 and 2021–2025.
May has ranged from a record low of 5°C (2021) to a record high of 25°C (1988).
Rainfall in May is about average for rainfall, averaging 68 mm, with a wettest year of 160 mm.
A good time to visit Mount Gambier
May is a good time to visit Mount Gambier, with days averaging 16.1°C and nights around 11°C (mean 13.6°C, close to Mount Gambier'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 | 17.7°C | 14.7°C | 11.6°C | 23.4°C | 5.3°C | 27 mm | 71% | 3.5 m/s | 2.7 |
| 2024 | 16.6°C | 13.5°C | 10.4°C | 19.9°C | 6.0°C | 16 mm | 78% | 3.1 m/s | 2.8 |
| 2023 | 15.6°C | 13.6°C | 11.6°C | 19.2°C | 8.5°C | 61 mm | 77% | 4.1 m/s | 2.4 |
| 2022 | 16.0°C | 13.6°C | 11.2°C | 20.4°C | 7.5°C | 57 mm | 79% | 3.9 m/s | 2.4 |
| 2021 | 16.1°C | 13.4°C | 10.8°C | 20.1°C | 5.0°C | 43 mm | 75% | 4.1 m/s | 2.4 |
| 2020 | 14.9°C | 12.5°C | 10.0°C | 18.5°C | 5.8°C | 100 mm | 77% | 4.1 m/s | 2.4 |
| 2019 | 16.4°C | 14.0°C | 11.7°C | 23.4°C | 8.3°C | 74 mm | 77% | 4.3 m/s | 2.3 |
| 2018 | 16.3°C | 14.2°C | 12.1°C | 22.0°C | 7.7°C | 82 mm | 74% | 4.4 m/s | 2.1 |
| 2017 | 15.6°C | 13.2°C | 10.8°C | 19.9°C | 8.3°C | 51 mm | 77% | 3.5 m/s | 2.3 |
| 2016 | 16.4°C | 14.2°C | 11.9°C | 20.4°C | 6.2°C | 80 mm | 78% | 4.8 m/s | 2.3 |
| 2015 | 15.7°C | 13.3°C | 10.8°C | 22.2°C | 6.9°C | 64 mm | 77% | 4.8 m/s | 2.4 |
| 2014 | 16.7°C | 14.2°C | 11.7°C | 20.5°C | 7.3°C | 84 mm | 82% | 3.3 m/s | 2.3 |
| 2013 | 16.8°C | 14.2°C | 11.5°C | 24.7°C | 8.4°C | 83 mm | 74% | 3.6 m/s | 2.4 |
| 2012 | 15.7°C | 13.5°C | 11.4°C | 22.2°C | 7.9°C | 85 mm | 78% | 4 m/s | 2.3 |
| 2011 | 14.7°C | 12.8°C | 11.0°C | 18.2°C | 6.9°C | 68 mm | 75% | 3.2 m/s | 2.2 |
| 2010 | 16.4°C | 13.3°C | 10.2°C | 21.5°C | 5.4°C | 54 mm | 81% | 3.3 m/s | 2.4 |
| 2009 | 16.2°C | 13.9°C | 11.7°C | 20.0°C | 7.8°C | 34 mm | 80% | 3.2 m/s | 2.3 |
| 2008 | 16.3°C | 13.6°C | 10.9°C | 20.6°C | 6.9°C | 55 mm | 80% | 3.2 m/s | 2.4 |
| 2007 🔥 | 17.6°C | 15.2°C | 12.7°C | 22.0°C | 10.2°C | 155 mm | 79% | 4.6 m/s | 2.3 |
| 2006 ❄️ | 14.6°C | 12.4°C | 10.2°C | 17.4°C | 6.6°C | 66 mm | 79% | 3.5 m/s | 2.2 |
| 2005 | 16.5°C | 13.9°C | 11.3°C | 24.6°C | 8.7°C | 19 mm | 77% | 3.3 m/s | 2.4 |
| 2004 | 15.5°C | 13.1°C | 10.7°C | 18.7°C | 7.0°C | 68 mm | 79% | 4.1 m/s | 2.3 |
| 2003 | 16.4°C | 13.3°C | 10.2°C | 20.2°C | 5.8°C | 38 mm | 79% | 3 m/s | 2.4 |
| 2002 | 17.2°C | 14.1°C | 11.0°C | 23.8°C | 6.4°C | 56 mm | 75% | 3.2 m/s | 2.6 |
| 2001 | 16.1°C | 13.5°C | 10.8°C | 21.5°C | 8.6°C | 61 mm | 79% | 2.9 m/s | 2.2 |
| 2000 | 15.6°C | 13.5°C | 11.4°C | 19.7°C | 8.1°C | 128 mm | 80% | 4.5 m/s | 2.3 |
| 1999 | 16.7°C | 13.9°C | 11.2°C | 22.2°C | 6.3°C | 81 mm | 79% | 4.1 m/s | 2.2 |
| 1998 | 15.9°C | 13.3°C | 10.7°C | 21.7°C | 7.9°C | 43 mm | 78% | 3.4 m/s | 2.2 |
| 1997 | 15.1°C | 12.9°C | 10.8°C | 19.7°C | 8.5°C | 109 mm | 82% | 3.3 m/s | 2 |
| 1996 | 16.3°C | 13.6°C | 10.8°C | 21.5°C | 7.1°C | 16 mm | 79% | 3 m/s | 2.2 |
| 1995 | 15.0°C | 12.6°C | 10.3°C | 18.6°C | 7.3°C | 50 mm | 81% | 3.4 m/s | 2.4 |
| 1994 | 15.8°C | 13.5°C | 11.1°C | 21.6°C | 7.6°C | 89 mm | 74% | 5.1 m/s | 2.4 |
| 1993 | 16.2°C | 13.4°C | 10.5°C | 20.7°C | 7.5°C | 45 mm | 78% | 3.3 m/s | 2.5 |
| 1992 | 15.1°C | 12.5°C | 10.0°C | 20.3°C | 5.9°C | 83 mm | 82% | 3.1 m/s | 2.3 |
| 1991 | 16.1°C | 13.3°C | 10.4°C | 19.7°C | 7.7°C | 21 mm | 80% | 2.8 m/s | 2.4 |
| 1990 | 16.3°C | 13.8°C | 11.2°C | 22.2°C | 6.5°C | 26 mm | 75% | 3.7 m/s | 2.5 |
| 1989 | 16.2°C | 13.9°C | 11.5°C | 20.1°C | 8.0°C | 78 mm | 82% | 3.6 m/s | 2.3 |
| 1988 | 17.7°C | 14.7°C | 11.7°C | 25.0°C | 8.7°C | 87 mm | 81% | 3 m/s | 2.3 |
| 1987 🌧️ | 15.9°C | 13.5°C | 11.1°C | 21.6°C | 7.5°C | 160 mm | 79% | 4 m/s | 2.3 |
| 1986 | 15.5°C | 13.1°C | 10.7°C | 18.7°C | 9.2°C | 83 mm | 81% | 3.3 m/s | 2.3 |
| 1985 | 16.1°C | 13.4°C | 10.8°C | 23.1°C | 7.2°C | 83 mm | 76% | 3.5 m/s | 2.5 |
| 1984 | 16.5°C | 13.4°C | 10.4°C | 20.4°C | 6.6°C | 61 mm | 77% | 3.6 m/s | 2.5 |
| 1983 | 15.9°C | 13.1°C | 10.3°C | 18.5°C | 5.1°C | 89 mm | 83% | 3.8 m/s | — |
| 1982 | 15.4°C | 13.1°C | 10.7°C | 20.1°C | 7.0°C | 69 mm | 74% | 4.3 m/s | — |
| 1981 | 16.3°C | 13.4°C | 10.4°C | 21.3°C | 6.2°C | 73 mm | 75% | 3.8 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 16.1°C with lows near 11°C (mean 13.6°C), based on 45 years of NASA POWER data.
May averages 68 mm of rainfall in Mount Gambier, about average for rainfall. The wettest on record was 160 mm in 1987.
The hottest May reached 25°C in 1988. The coldest dipped to 5°C in 2021.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 0.5°C. Daytime highs moved from 16°C to 16.4°C and overnight lows from 10.5°C to 11.1°C over the same span.
May is one of the cooler months of the year in Mount Gambier and about average for rainfall, so plan for around 16.1°C daytime highs and 11°C at night.
Not quite — May is the 6th coolest month in Mount Gambier, averaging 13.6°C.
For May in Mount Gambier, pack light layers you can adjust through the day, with typical highs of 16.1°C and lows of 11°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 78% — quite humid.
Average wind speed in May is 3.7 m/s. The windiest May on record averaged 5.1 m/s (1994).
The wettest May on record was 1987 with 160 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 Mount Gambier 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.
