May is one of the cooler months of the year in Victor Harbor, with average highs near 17.1°C and lows around 11.8°C (mean 14.5°C). It is a relatively wet time of year, averaging 53 mm of rainfall and 74% relative humidity across the period.
May is one of the cooler months of the year in Victor Harbor. Across 45 years of records, the warmest Mays in Victor Harbor were 2007, 2014 and 2016, among others — when the month averaged 15.6°C — while the coldest were 2006 and 2020 at 13.1°C. Typical May days reach 17.1°C with nights near 11.8°C. The long-term May temperature trend is broadly flat.
May is a relatively wet time of year in Victor Harbor, averaging 53 mm of rainfall. The wettest May on record was 1987 with 96 mm, while the driest was 2005 at 10 mm.
Relative humidity in Victor Harbor during May averages 74%. The most humid May was 2009 at 79%, and the least humid was 2002 at 67%.
May receives about 2.6 kWh/m²/day of solar energy in Victor Harbor. The sunniest Mays were 2024 and 2025 at 3.1 kWh/m²/day, and the cloudiest was 1997 at 2.2.
Average wind speed in Victor Harbor during May is 4.5 m/s. The windiest May was 2016 at 6 m/s, while the calmest were 1991 and 2024 at 3.5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 14.3°C | 14.3°C | 14.5°C | 14.8°C | 14.3°C | 0°C |
| Avg High | 17.0°C | 17.0°C | 17.2°C | 17.4°C | 17.2°C | +0.2°C |
| Avg Low | 11.7°C | 11.6°C | 11.9°C | 12.1°C | 11.4°C | -0.3°C |
| Avg Rain | 63 mm | 45 mm | 55 mm | 53 mm | 43 mm | -20 mm |
May temperatures in Victor Harbor have risen by about 0.5°C between 1981–1985 and 2021–2025.
May has ranged from a record low of 6.2°C (2006) to a record high of 26°C (1988).
Rainfall in May is a relatively wet time of year, averaging 53 mm, with a wettest year of 96 mm.
A good time to visit Victor Harbor
May is a good time to visit Victor Harbor, with days averaging 17.1°C and nights around 11.8°C (mean 14.5°C, cooler than Victor Harbor'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 | 18.5°C | 15.2°C | 11.9°C | 24.4°C | 7.3°C | 28 mm | 68% | 4.3 m/s | 3.1 |
| 2024 | 17.9°C | 14.4°C | 10.9°C | 21.1°C | 9.2°C | 13 mm | 73% | 3.5 m/s | 3.1 |
| 2023 | 16.6°C | 14.2°C | 11.8°C | 21.4°C | 8.1°C | 60 mm | 75% | 4.6 m/s | 2.6 |
| 2022 | 16.9°C | 14.2°C | 11.5°C | 21.0°C | 7.5°C | 65 mm | 75% | 4.5 m/s | 2.8 |
| 2021 | 17.6°C | 14.8°C | 11.9°C | 24.5°C | 6.4°C | 11 mm | 67% | 4.7 m/s | 2.6 |
| 2020 | 15.7°C | 13.1°C | 10.6°C | 19.8°C | 7.5°C | 80 mm | 74% | 5.3 m/s | 2.7 |
| 2019 | 17.4°C | 14.8°C | 12.2°C | 21.9°C | 9.7°C | 45 mm | 73% | 5.3 m/s | 2.6 |
| 2018 | 17.5°C | 15.1°C | 12.7°C | 23.7°C | 8.6°C | 30 mm | 71% | 5.1 m/s | 2.3 |
| 2017 | 17.3°C | 14.4°C | 11.5°C | 21.3°C | 8.6°C | 23 mm | 71% | 4.3 m/s | 2.7 |
| 2016 | 18.0°C | 15.6°C | 13.1°C | 21.7°C | 8.7°C | 54 mm | 74% | 6 m/s | 2.5 |
| 2015 | 16.5°C | 14.1°C | 11.6°C | 23.4°C | 7.3°C | 61 mm | 76% | 5.3 m/s | 2.6 |
| 2014 | 18.3°C | 15.6°C | 12.9°C | 22.7°C | 7.9°C | 63 mm | 76% | 4.2 m/s | 2.6 |
| 2013 | 18.3°C | 15.5°C | 12.6°C | 25.4°C | 9.1°C | 73 mm | 71% | 4.5 m/s | 2.6 |
| 2012 | 16.5°C | 14.1°C | 11.6°C | 23.8°C | 7.5°C | 77 mm | 75% | 4.5 m/s | 2.5 |
| 2011 | 16.1°C | 13.7°C | 11.3°C | 20.6°C | 7.5°C | 52 mm | 74% | 4.2 m/s | 2.4 |
| 2010 | 17.8°C | 14.8°C | 11.8°C | 22.8°C | 8.6°C | 56 mm | 73% | 4.3 m/s | 2.6 |
| 2009 | 16.8°C | 14.4°C | 12.1°C | 20.5°C | 8.9°C | 37 mm | 79% | 3.7 m/s | 2.4 |
| 2008 | 17.5°C | 14.8°C | 12.1°C | 21.9°C | 8.9°C | 65 mm | 76% | 3.8 m/s | 2.7 |
| 2007 | 18.1°C | 15.6°C | 13.2°C | 22.4°C | 10.0°C | 63 mm | 76% | 5.8 m/s | 2.5 |
| 2006 ❄️ | 15.4°C | 13.1°C | 10.8°C | 18.9°C | 6.2°C | 57 mm | 77% | 4.2 m/s | 2.4 |
| 2005 | 18.1°C | 15.2°C | 12.3°C | 25.3°C | 8.5°C | 10 mm | 72% | 3.7 m/s | 2.7 |
| 2004 | 16.6°C | 13.8°C | 11.1°C | 20.5°C | 6.6°C | 45 mm | 74% | 4.7 m/s | 2.7 |
| 2003 | 17.4°C | 14.5°C | 11.6°C | 21.0°C | 7.5°C | 68 mm | 75% | 4 m/s | 2.6 |
| 2002 | 18.4°C | 15.3°C | 12.2°C | 25.9°C | 8.0°C | 61 mm | 67% | 4.2 m/s | 2.7 |
| 2001 | 17.1°C | 14.4°C | 11.8°C | 23.1°C | 9.3°C | 77 mm | 75% | 3.7 m/s | 2.5 |
| 2000 | 16.3°C | 14.0°C | 11.6°C | 21.3°C | 8.2°C | 71 mm | 76% | 4.9 m/s | 2.5 |
| 1999 | 17.6°C | 14.8°C | 12.0°C | 23.1°C | 6.8°C | 73 mm | 72% | 4.8 m/s | 2.4 |
| 1998 | 17.4°C | 14.5°C | 11.5°C | 22.9°C | 7.5°C | 34 mm | 74% | 4.2 m/s | 2.5 |
| 1997 | 16.3°C | 13.9°C | 11.5°C | 24.0°C | 8.1°C | 69 mm | 77% | 4.2 m/s | 2.2 |
| 1996 | 17.1°C | 14.3°C | 11.5°C | 22.3°C | 8.0°C | 27 mm | 76% | 3.6 m/s | 2.6 |
| 1995 | 15.9°C | 13.5°C | 11.2°C | 19.6°C | 8.3°C | 63 mm | 76% | 4.4 m/s | 2.4 |
| 1994 | 17.0°C | 14.4°C | 11.9°C | 23.5°C | 8.5°C | 48 mm | 72% | 5.9 m/s | 2.7 |
| 1993 | 17.8°C | 14.9°C | 12.1°C | 23.5°C | 7.5°C | 38 mm | 70% | 4.1 m/s | 2.7 |
| 1992 | 15.9°C | 13.5°C | 11.2°C | 22.8°C | 7.1°C | 60 mm | 76% | 3.8 m/s | 2.6 |
| 1991 | 16.9°C | 14.1°C | 11.3°C | 20.1°C | 9.2°C | 19 mm | 73% | 3.5 m/s | 2.5 |
| 1990 | 17.6°C | 14.8°C | 12.0°C | 23.6°C | 6.6°C | 18 mm | 71% | 4.7 m/s | 2.7 |
| 1989 | 17.0°C | 14.6°C | 12.1°C | 20.3°C | 8.3°C | 82 mm | 77% | 4.7 m/s | 2.5 |
| 1988 🔥 | 18.2°C | 15.6°C | 12.9°C | 26.0°C | 8.9°C | 86 mm | 75% | 4.4 m/s | 2.4 |
| 1987 🌧️ | 16.5°C | 14.1°C | 11.7°C | 22.9°C | 8.8°C | 96 mm | 76% | 5.3 m/s | 2.5 |
| 1986 | 16.8°C | 14.0°C | 11.2°C | 20.9°C | 8.4°C | 42 mm | 76% | 4.4 m/s | 2.7 |
| 1985 | 16.6°C | 13.9°C | 11.1°C | 23.1°C | 6.6°C | 43 mm | 70% | 4.5 m/s | 2.7 |
| 1984 | 17.6°C | 14.7°C | 11.7°C | 21.6°C | 7.9°C | 47 mm | 69% | 4.5 m/s | 2.6 |
| 1983 | 16.6°C | 13.9°C | 11.2°C | 20.1°C | 7.2°C | 61 mm | 77% | 4.4 m/s | — |
| 1982 | 16.8°C | 14.2°C | 11.7°C | 21.4°C | 7.4°C | 49 mm | 71% | 5 m/s | — |
| 1981 | 16.7°C | 14.0°C | 11.4°C | 23.1°C | 7.2°C | 65 mm | 71% | 5.3 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 17.1°C with lows near 11.8°C (mean 14.5°C), based on 45 years of NASA POWER data.
May averages 53 mm of rainfall in Victor Harbor, a relatively wet time of year. The wettest on record was 96 mm in 1987.
The hottest May reached 26°C in 1988. The coldest dipped to 6.2°C in 2006.
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 16.9°C to 17.5°C and overnight lows from 11.4°C to 11.6°C over the same span.
May is one of the cooler months of the year in Victor Harbor and a relatively wet time of year, so plan for around 17.1°C daytime highs and 11.8°C at night.
Not quite — May is the 5th coolest month in Victor Harbor, averaging 14.5°C.
For May in Victor Harbor, pack light layers you can adjust through the day, with typical highs of 17.1°C and lows of 11.8°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 74% — moderately humid.
Average wind speed in May is 4.5 m/s. The windiest May on record averaged 6 m/s (2016).
The wettest May on record was 1987 with 96 mm. On average, May sees 53 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 Victor Harbor 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.
