May is one of the cooler months of the year in Kalgoorlie, with average highs near 22°C and lows around 8.7°C (mean 15.4°C). It is about average for rainfall, averaging 22 mm of rainfall and 58% relative humidity across the period.
May is one of the cooler months of the year in Kalgoorlie. Across 45 years of records, the warmest May in Kalgoorlie was 1998 — when the month averaged 18°C — while the coldest was 1995 at 12.6°C. Typical May days reach 22°C with nights near 8.7°C. The long-term May temperature trend is broadly flat.
May is about average for rainfall in Kalgoorlie, averaging 22 mm of rainfall. The wettest May on record was 1989 with 68 mm, while the driest was 2017 at 1 mm.
Relative humidity in Kalgoorlie during May averages 58%. The most humid May was 1995 at 70%, and the least humid was 1983 at 44%.
May receives about 3.6 kWh/m²/day of solar energy in Kalgoorlie. The sunniest Mays were 2019, 2020 and 2025, among others at 4 kWh/m²/day, and the cloudiest was 1997 at 2.9.
Average wind speed in Kalgoorlie during May is 2.8 m/s. The windiest May was 1981 at 3.4 m/s, while the calmest were 2000, 2008 and 2014 at 2.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 14.9°C | 15.5°C | 15.6°C | 15.0°C | 15.9°C | +1°C |
| Avg High | 21.5°C | 21.8°C | 22.5°C | 21.8°C | 23.0°C | +1.5°C |
| Avg Low | 8.3°C | 9.2°C | 8.7°C | 8.3°C | 8.9°C | +0.6°C |
| Avg Rain | 36 mm | 30 mm | 15 mm | 15 mm | 7 mm | -28 mm |
May temperatures in Kalgoorlie have risen by about 1.1°C between 1981–1985 and 2021–2025.
May has ranged from a record low of 2.1°C (2019) to a record high of 33.3°C (2002).
Rainfall in May is about average for rainfall, averaging 22 mm, with a wettest year of 68 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.3°C per decade while lows rose 0°C per decade, widening the gap between day and night.
A quieter season to visit Kalgoorlie
If your dates are flexible, the more temperate months of November and March tend to be the most comfortable for visiting Kalgoorlie. That said, May — with days averaging 22°C and nights around 8.7°C (mean 15.4°C) and low rainfall (22 mm) — can still be rewarding for travellers who don't mind the cooler conditions, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 23.8°C | 16.3°C | 8.8°C | 29.9°C | 2.6°C | 1 mm | 54% | 2.6 m/s | 4 |
| 2024 | 24.8°C | 17.4°C | 10.1°C | 28.9°C | 4.5°C | 2 mm | 46% | 2.9 m/s | 3.6 |
| 2023 | 22.8°C | 15.7°C | 8.7°C | 28.1°C | 3.3°C | 2 mm | 49% | 2.9 m/s | 3.8 |
| 2022 | 22.5°C | 15.7°C | 8.8°C | 27.4°C | 4.6°C | 8 mm | 52% | 3 m/s | 3.6 |
| 2021 | 22.2°C | 15.9°C | 9.5°C | 28.1°C | 3.0°C | 27 mm | 55% | 3 m/s | 3.5 |
| 2020 | 21.8°C | 14.5°C | 7.3°C | 30.0°C | 4.3°C | 5 mm | 48% | 3.2 m/s | 4 |
| 2019 | 21.8°C | 14.2°C | 6.7°C | 30.7°C | 2.1°C | 9 mm | 54% | 2.5 m/s | 4 |
| 2018 | 22.8°C | 15.6°C | 8.4°C | 28.7°C | 4.2°C | 1 mm | 49% | 3.2 m/s | 4 |
| 2017 | 21.9°C | 15.1°C | 8.4°C | 27.1°C | 3.8°C | 1 mm | 61% | 2.6 m/s | 3.7 |
| 2016 | 21.7°C | 14.6°C | 7.5°C | 27.8°C | 3.9°C | 6 mm | 59% | 2.7 m/s | 3.8 |
| 2015 | 20.3°C | 14.1°C | 7.8°C | 25.5°C | 3.1°C | 5 mm | 61% | 2.8 m/s | 3.7 |
| 2014 | 21.7°C | 15.8°C | 9.9°C | 25.2°C | 3.4°C | 31 mm | 65% | 2.4 m/s | 3.3 |
| 2013 | 21.9°C | 15.9°C | 9.8°C | 30.6°C | 4.4°C | 46 mm | 64% | 2.9 m/s | 3.4 |
| 2012 | 22.6°C | 15.5°C | 8.5°C | 27.4°C | 2.8°C | 11 mm | 57% | 2.5 m/s | 3.8 |
| 2011 | 20.9°C | 14.7°C | 8.5°C | 25.1°C | 5.0°C | 24 mm | 65% | 2.7 m/s | 3.3 |
| 2010 | 22.0°C | 14.9°C | 7.9°C | 28.0°C | 3.0°C | 18 mm | 58% | 3 m/s | 3.7 |
| 2009 | 21.3°C | 14.4°C | 7.6°C | 26.5°C | 3.1°C | 11 mm | 58% | 2.6 m/s | 3.7 |
| 2008 | 24.7°C | 17.4°C | 10.0°C | 30.2°C | 5.5°C | 4 mm | 52% | 2.4 m/s | 3.8 |
| 2007 | 21.7°C | 14.6°C | 7.5°C | 27.0°C | 2.4°C | 5 mm | 55% | 2.6 m/s | 3.8 |
| 2006 | 22.0°C | 14.9°C | 7.8°C | 26.5°C | 3.3°C | 8 mm | 57% | 2.5 m/s | 3.7 |
| 2005 | 24.0°C | 17.9°C | 11.8°C | 28.3°C | 5.7°C | 26 mm | 59% | 2.9 m/s | 3 |
| 2004 | 20.9°C | 14.2°C | 7.4°C | 29.8°C | 2.6°C | 13 mm | 58% | 2.7 m/s | 3.5 |
| 2003 | 22.6°C | 15.7°C | 8.8°C | 29.8°C | 4.1°C | 42 mm | 54% | 3.1 m/s | 3.5 |
| 2002 | 24.9°C | 17.9°C | 10.9°C | 33.3°C | 4.9°C | 9 mm | 51% | 2.7 m/s | 3.5 |
| 2001 | 22.3°C | 15.7°C | 9.2°C | 28.8°C | 5.3°C | 34 mm | 63% | 2.7 m/s | 3.4 |
| 2000 | 20.1°C | 13.2°C | 6.2°C | 25.9°C | 3.2°C | 3 mm | 63% | 2.4 m/s | 3.9 |
| 1999 | 21.8°C | 15.9°C | 9.9°C | 28.0°C | 2.7°C | 56 mm | 67% | 2.7 m/s | 3.2 |
| 1998 🔥 | 24.2°C | 18.0°C | 11.8°C | 29.2°C | 6.4°C | 20 mm | 61% | 2.9 m/s | 3.3 |
| 1997 | 19.9°C | 14.6°C | 9.4°C | 26.2°C | 4.4°C | 49 mm | 68% | 3.1 m/s | 2.9 |
| 1996 | 22.9°C | 15.9°C | 9.0°C | 29.9°C | 4.6°C | 3 mm | 53% | 2.7 m/s | 3.7 |
| 1995 ❄️ | 18.9°C | 12.6°C | 6.3°C | 25.2°C | 2.8°C | 14 mm | 70% | 3 m/s | 3.6 |
| 1994 | 24.4°C | 17.1°C | 9.9°C | 29.1°C | 5.1°C | 15 mm | 47% | 3.1 m/s | 3.8 |
| 1993 | 20.3°C | 14.2°C | 8.1°C | 24.7°C | 2.9°C | 39 mm | 61% | 2.6 m/s | 3.3 |
| 1992 | 19.9°C | 14.1°C | 8.2°C | 25.3°C | 3.2°C | 61 mm | 70% | 2.6 m/s | 3.4 |
| 1991 | 22.5°C | 16.0°C | 9.5°C | 27.9°C | 4.3°C | 21 mm | 55% | 2.9 m/s | 3.6 |
| 1990 | 22.8°C | 16.4°C | 9.9°C | 32.6°C | 3.1°C | 24 mm | 58% | 2.7 m/s | 3.5 |
| 1989 🌧️ | 21.4°C | 14.9°C | 8.3°C | 26.6°C | 3.8°C | 68 mm | 61% | 2.8 m/s | 3.4 |
| 1988 | 20.8°C | 14.8°C | 8.9°C | 25.0°C | 4.7°C | 57 mm | 67% | 2.9 m/s | 3.2 |
| 1987 | 20.5°C | 13.6°C | 6.7°C | 26.5°C | 3.0°C | 14 mm | 55% | 2.8 m/s | 3.7 |
| 1986 | 21.3°C | 14.8°C | 8.4°C | 27.5°C | 4.9°C | 44 mm | 60% | 2.8 m/s | 3.6 |
| 1985 | 20.8°C | 14.0°C | 7.1°C | 31.2°C | 3.2°C | 32 mm | 54% | 2.7 m/s | 3.4 |
| 1984 | 21.1°C | 14.9°C | 8.6°C | 25.0°C | 5.6°C | 39 mm | 64% | 3.1 m/s | 3.4 |
| 1983 | 24.4°C | 16.6°C | 8.9°C | 31.0°C | 3.9°C | 4 mm | 44% | 2.6 m/s | — |
| 1982 | 21.6°C | 15.2°C | 8.8°C | 29.8°C | 3.2°C | 24 mm | 59% | 2.7 m/s | — |
| 1981 | 21.2°C | 14.9°C | 8.7°C | 29.4°C | 3.5°C | 41 mm | 57% | 3.4 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 22°C with lows near 8.7°C (mean 15.4°C), based on 45 years of NASA POWER data.
May averages 22 mm of rainfall in Kalgoorlie, about average for rainfall. The wettest on record was 68 mm in 1989.
The hottest May reached 33.3°C in 2002. The coldest dipped to 2.1°C in 2019.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 1.1°C. Daytime highs moved from 21.8°C to 23.2°C and overnight lows from 8.4°C to 9.2°C over the same span.
May is one of the cooler months of the year in Kalgoorlie and about average for rainfall, so plan for around 22°C daytime highs and 8.7°C at night.
Not quite — May is the 4th coolest month in Kalgoorlie, averaging 15.4°C.
For May in Kalgoorlie, pack light layers you can adjust through the day, with typical highs of 22°C and lows of 8.7°C.
Relative humidity in May averages 58% — moderately humid.
Average wind speed in May is 2.8 m/s. The windiest May on record averaged 3.4 m/s (1981).
The wettest May on record was 1989 with 68 mm. On average, May sees 22 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 Kalgoorlie 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.
