May is one of the cooler months of the year in Port Lincoln, with average highs near 18.4°C and lows around 12.6°C (mean 15.5°C). It is about average for rainfall, averaging 41 mm of rainfall and 71% relative humidity across the period.
May is one of the cooler months of the year in Port Lincoln. Across 45 years of records, the warmest May in Port Lincoln was 2014 — when the month averaged 16.9°C — while the coldest were 2006 and 2020 at 14.2°C. Typical May days reach 18.4°C with nights near 12.6°C. The long-term May temperature trend is broadly flat.
May is about average for rainfall in Port Lincoln, averaging 41 mm of rainfall. The wettest May on record was 1981 with 81 mm, while the driest was 2024 at 6 mm.
Relative humidity in Port Lincoln during May averages 71%. The most humid May was 1983 at 77%, and the least humid was 2021 at 62%.
May receives about 2.7 kWh/m²/day of solar energy in Port Lincoln. The sunniest May was 2024 at 3.3 kWh/m²/day, and the cloudiest was 1997 at 2.4.
Average wind speed in Port Lincoln during May is 4.6 m/s. The windiest Mays were 2007 and 2016 at 6 m/s, while the calmest were 1996 and 2009 at 3.7 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 15.2°C | 15.3°C | 15.6°C | 15.7°C | 15.4°C | +0.2°C |
| Avg High | 18.1°C | 18.3°C | 18.4°C | 18.5°C | 18.5°C | +0.4°C |
| Avg Low | 12.2°C | 12.4°C | 12.8°C | 12.9°C | 12.4°C | +0.2°C |
| Avg Rain | 50 mm | 43 mm | 45 mm | 36 mm | 22 mm | -28 mm |
May temperatures in Port Lincoln have risen by about 0.6°C between 1981–1985 and 2021–2025.
May has ranged from a record low of 7.5°C (2020) to a record high of 28.3°C (2002).
Rainfall in May is about average for rainfall, averaging 41 mm, with a wettest year of 81 mm.
A good time to visit Port Lincoln
May is a good time to visit Port Lincoln, with days averaging 18.4°C and nights around 12.6°C (mean 15.5°C, cooler than Port Lincoln'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 | 19.6°C | 16.2°C | 12.8°C | 25.6°C | 7.5°C | 17 mm | 65% | 4.5 m/s | 3.2 |
| 2024 | 19.5°C | 15.7°C | 12.0°C | 23.6°C | 9.8°C | 6 mm | 71% | 3.8 m/s | 3.3 |
| 2023 | 17.9°C | 15.3°C | 12.7°C | 21.2°C | 10.8°C | 21 mm | 73% | 4.4 m/s | 2.6 |
| 2022 | 18.2°C | 15.4°C | 12.6°C | 22.2°C | 10.0°C | 34 mm | 72% | 4.8 m/s | 3 |
| 2021 | 18.7°C | 15.8°C | 12.9°C | 23.9°C | 8.2°C | 15 mm | 62% | 4.5 m/s | 2.6 |
| 2020 | 17.2°C | 14.2°C | 11.3°C | 23.9°C | 7.5°C | 41 mm | 70% | 5.4 m/s | 2.8 |
| 2019 | 18.1°C | 15.3°C | 12.6°C | 23.7°C | 9.9°C | 30 mm | 71% | 5 m/s | 2.7 |
| 2018 | 18.7°C | 16.1°C | 13.5°C | 25.6°C | 10.6°C | 9 mm | 66% | 5 m/s | 2.5 |
| 2017 | 19.0°C | 15.9°C | 12.7°C | 23.4°C | 9.5°C | 10 mm | 67% | 4.5 m/s | 2.9 |
| 2016 | 19.0°C | 16.2°C | 13.4°C | 23.9°C | 10.8°C | 27 mm | 71% | 6 m/s | 2.8 |
| 2015 | 17.4°C | 14.9°C | 12.3°C | 22.5°C | 8.9°C | 21 mm | 72% | 5.2 m/s | 2.5 |
| 2014 🔥 | 19.9°C | 16.9°C | 14.0°C | 25.3°C | 11.1°C | 73 mm | 74% | 4.2 m/s | 2.6 |
| 2013 | 19.9°C | 16.8°C | 13.7°C | 27.7°C | 9.1°C | 55 mm | 70% | 4.5 m/s | 2.6 |
| 2012 | 17.5°C | 14.9°C | 12.2°C | 24.7°C | 8.2°C | 53 mm | 72% | 4.6 m/s | 2.6 |
| 2011 | 17.4°C | 14.9°C | 12.4°C | 23.9°C | 8.7°C | 38 mm | 72% | 4.4 m/s | 2.6 |
| 2010 | 18.4°C | 15.3°C | 12.2°C | 24.1°C | 8.0°C | 42 mm | 72% | 4.4 m/s | 2.8 |
| 2009 | 18.0°C | 15.7°C | 13.3°C | 22.4°C | 11.7°C | 15 mm | 75% | 3.7 m/s | 2.6 |
| 2008 | 19.0°C | 15.9°C | 12.8°C | 23.1°C | 10.8°C | 44 mm | 74% | 4.2 m/s | 2.9 |
| 2007 | 18.8°C | 16.0°C | 13.3°C | 24.9°C | 9.2°C | 73 mm | 74% | 6 m/s | 2.7 |
| 2006 ❄️ | 16.8°C | 14.2°C | 11.6°C | 20.8°C | 8.3°C | 44 mm | 74% | 4.2 m/s | 2.6 |
| 2005 | 19.6°C | 16.6°C | 13.7°C | 26.7°C | 9.9°C | 15 mm | 71% | 4 m/s | 2.6 |
| 2004 | 18.0°C | 15.1°C | 12.2°C | 21.7°C | 9.4°C | 41 mm | 72% | 4.9 m/s | 2.8 |
| 2003 | 18.9°C | 15.8°C | 12.6°C | 24.5°C | 9.5°C | 53 mm | 72% | 4.3 m/s | 2.8 |
| 2002 | 19.9°C | 16.7°C | 13.6°C | 28.3°C | 10.0°C | 43 mm | 65% | 4.4 m/s | 3 |
| 2001 | 18.1°C | 15.2°C | 12.4°C | 22.3°C | 10.6°C | 64 mm | 72% | 4.1 m/s | 2.7 |
| 2000 | 17.3°C | 14.8°C | 12.3°C | 24.2°C | 9.1°C | 60 mm | 73% | 4.8 m/s | 2.7 |
| 1999 | 18.7°C | 15.7°C | 12.8°C | 24.5°C | 10.7°C | 60 mm | 69% | 4.9 m/s | 2.5 |
| 1998 | 19.0°C | 15.8°C | 12.5°C | 23.8°C | 9.1°C | 21 mm | 71% | 4.3 m/s | 2.6 |
| 1997 | 17.1°C | 14.9°C | 12.7°C | 23.8°C | 9.3°C | 65 mm | 76% | 4.6 m/s | 2.4 |
| 1996 | 18.8°C | 15.5°C | 12.2°C | 25.6°C | 8.5°C | 30 mm | 71% | 3.7 m/s | 2.8 |
| 1995 | 17.1°C | 14.4°C | 11.7°C | 23.7°C | 8.8°C | 65 mm | 72% | 4.8 m/s | 2.6 |
| 1994 | 18.6°C | 15.4°C | 12.2°C | 24.9°C | 9.2°C | 39 mm | 69% | 5.7 m/s | 2.9 |
| 1993 | 18.9°C | 15.8°C | 12.7°C | 26.8°C | 8.6°C | 32 mm | 72% | 4.2 m/s | 2.8 |
| 1992 | 17.4°C | 14.6°C | 11.8°C | 24.9°C | 7.7°C | 67 mm | 75% | 4.5 m/s | 2.8 |
| 1991 | 18.1°C | 15.1°C | 12.2°C | 22.3°C | 10.2°C | 29 mm | 70% | 3.8 m/s | 2.6 |
| 1990 | 19.1°C | 16.1°C | 13.2°C | 25.4°C | 8.4°C | 21 mm | 70% | 4.8 m/s | 2.9 |
| 1989 | 18.1°C | 15.4°C | 12.7°C | 21.5°C | 10.9°C | 71 mm | 76% | 4.9 m/s | 2.7 |
| 1988 | 19.0°C | 16.1°C | 13.1°C | 25.4°C | 9.7°C | 70 mm | 75% | 5.1 m/s | 2.6 |
| 1987 | 17.6°C | 14.7°C | 11.7°C | 24.0°C | 7.8°C | 61 mm | 74% | 5.2 m/s | 2.6 |
| 1986 | 18.0°C | 15.0°C | 12.0°C | 22.2°C | 9.7°C | 28 mm | 73% | 4.5 m/s | 2.7 |
| 1985 | 18.1°C | 15.1°C | 12.0°C | 25.1°C | 8.3°C | 25 mm | 66% | 4.5 m/s | 2.9 |
| 1984 | 18.6°C | 15.4°C | 12.1°C | 25.3°C | 9.4°C | 33 mm | 68% | 4.9 m/s | 2.8 |
| 1983 | 17.7°C | 14.7°C | 11.8°C | 21.8°C | 9.0°C | 34 mm | 77% | 4.3 m/s | — |
| 1982 | 17.9°C | 15.1°C | 12.2°C | 23.7°C | 8.9°C | 46 mm | 70% | 5 m/s | — |
| 1981 🌧️ | 17.8°C | 15.0°C | 12.3°C | 26.0°C | 9.0°C | 81 mm | 69% | 5.6 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 18.4°C with lows near 12.6°C (mean 15.5°C), based on 45 years of NASA POWER data.
May averages 41 mm of rainfall in Port Lincoln, about average for rainfall. The wettest on record was 81 mm in 1981.
The hottest May reached 28.3°C in 2002. The coldest dipped to 7.5°C in 2020.
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 18°C to 18.8°C and overnight lows from 12.1°C to 12.6°C over the same span.
May is one of the cooler months of the year in Port Lincoln and about average for rainfall, so plan for around 18.4°C daytime highs and 12.6°C at night.
Not quite — May is the 5th coolest month in Port Lincoln, averaging 15.5°C.
For May in Port Lincoln, pack light layers you can adjust through the day, with typical highs of 18.4°C and lows of 12.6°C.
Relative humidity in May averages 71% — moderately humid.
Average wind speed in May is 4.6 m/s. The windiest May on record averaged 6 m/s (2007).
The wettest May on record was 1981 with 81 mm. On average, May sees 41 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 Port Lincoln 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.
