May is one of the cooler months of the year in Karratha, with average highs near 27.8°C and lows around 23.4°C (mean 25.6°C). It is about average for rainfall, averaging 30 mm of rainfall and 60% relative humidity across the period.
May is one of the cooler months of the year in Karratha. Across 45 years of records, the warmest May in Karratha was 1998 — when the month averaged 27.6°C — while the coldest was 2000 at 22.7°C. Typical May days reach 27.8°C with nights near 23.4°C. The long-term May temperature trend is broadly flat.
May is about average for rainfall in Karratha, averaging 30 mm of rainfall. The wettest May on record was 2022 with 167 mm, while the driest were 1996, 2012 and 2019, among others at 0 mm.
Relative humidity in Karratha during May averages 60%. The most humid May was 2015 at 70%, and the least humid was 1986 at 51%.
May receives about 4.5 kWh/m²/day of solar energy in Karratha. The sunniest May was 2019 at 5.2 kWh/m²/day, and the cloudiest was 2022 at 3.5.
Average wind speed in Karratha during May is 4.5 m/s. The windiest May was 2000 at 6.4 m/s, while the calmest was 1984 at 3.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 25.6°C | 25.8°C | 25.6°C | 25.3°C | 25.7°C | +0.1°C |
| Avg High | 27.9°C | 27.9°C | 27.9°C | 27.6°C | 27.8°C | -0.1°C |
| Avg Low | 23.4°C | 23.7°C | 23.3°C | 23.1°C | 23.5°C | +0.1°C |
| Avg Rain | 33 mm | 27 mm | 13 mm | 37 mm | 50 mm | +17 mm |
May temperatures in Karratha have fallen by about 0.3°C between 1981–1985 and 2021–2025.
May has ranged from a record low of 18°C (2000) to a record high of 33.6°C (1990).
Rainfall in May is about average for rainfall, averaging 30 mm, with a wettest year of 167 mm.
A good time to visit Karratha
May is a good time to visit Karratha, with days averaging 27.8°C and nights around 23.4°C (mean 25.6°C, close to Karratha's yearly average) and moderate rainfall. August and July 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 | 28.6°C | 26.3°C | 24.0°C | 31.9°C | 20.5°C | 4 mm | 55% | 4.9 m/s | 4.8 |
| 2024 | 28.1°C | 25.9°C | 23.7°C | 30.4°C | 21.7°C | 5 mm | 59% | 4.3 m/s | 4.9 |
| 2023 | 26.9°C | 24.6°C | 22.4°C | 29.9°C | 19.1°C | 0 mm | 54% | 4.9 m/s | 4.7 |
| 2022 🌧️ | 27.6°C | 25.9°C | 24.2°C | 31.1°C | 18.5°C | 167 mm | 67% | 4.4 m/s | 3.5 |
| 2021 | 28.2°C | 26.0°C | 23.8°C | 31.9°C | 20.9°C | 89 mm | 63% | 4.3 m/s | 4.2 |
| 2020 | 27.6°C | 25.4°C | 23.1°C | 30.4°C | 18.3°C | 36 mm | 54% | 5 m/s | 4.7 |
| 2019 | 27.9°C | 25.3°C | 22.6°C | 30.6°C | 20.3°C | 0 mm | 54% | 4.3 m/s | 5.2 |
| 2018 | 28.1°C | 25.8°C | 23.4°C | 31.8°C | 20.0°C | 3 mm | 55% | 5.4 m/s | 5 |
| 2017 | 28.4°C | 25.8°C | 23.1°C | 29.9°C | 21.4°C | 0 mm | 58% | 3.8 m/s | 5.1 |
| 2016 | 28.1°C | 26.1°C | 24.2°C | 30.1°C | 21.7°C | 11 mm | 62% | 3.9 m/s | 4.4 |
| 2015 | 26.0°C | 23.9°C | 21.7°C | 29.5°C | 19.2°C | 112 mm | 70% | 5 m/s | 4 |
| 2014 | 27.9°C | 26.0°C | 24.0°C | 29.8°C | 20.6°C | 92 mm | 63% | 3.8 m/s | 4.3 |
| 2013 | 27.5°C | 25.3°C | 23.1°C | 32.3°C | 19.3°C | 51 mm | 62% | 4.9 m/s | 4 |
| 2012 | 27.7°C | 25.4°C | 23.1°C | 30.7°C | 19.3°C | 0 mm | 55% | 4.8 m/s | 5 |
| 2011 | 25.9°C | 23.9°C | 21.9°C | 28.7°C | 19.6°C | 84 mm | 66% | 6 m/s | 3.9 |
| 2010 | 28.0°C | 25.8°C | 23.5°C | 31.9°C | 20.4°C | 16 mm | 57% | 4.5 m/s | 4.7 |
| 2009 | 27.0°C | 24.8°C | 22.6°C | 30.7°C | 19.5°C | 3 mm | 58% | 4.9 m/s | 4.5 |
| 2008 | 29.1°C | 26.4°C | 23.8°C | 31.9°C | 21.8°C | 0 mm | 52% | 3.6 m/s | 4.9 |
| 2007 | 28.7°C | 26.5°C | 24.2°C | 31.2°C | 22.0°C | 0 mm | 54% | 4.3 m/s | 4.7 |
| 2006 | 26.9°C | 24.3°C | 21.8°C | 29.1°C | 18.4°C | 10 mm | 63% | 4.7 m/s | 4.4 |
| 2005 | 29.3°C | 27.0°C | 24.7°C | 31.9°C | 21.9°C | 56 mm | 60% | 3.8 m/s | 4.3 |
| 2004 | 26.8°C | 24.6°C | 22.4°C | 29.6°C | 18.6°C | 6 mm | 59% | 5.1 m/s | 4.7 |
| 2003 | 28.5°C | 26.4°C | 24.3°C | 31.1°C | 21.3°C | 3 mm | 59% | 4.3 m/s | 4.6 |
| 2002 | 29.2°C | 27.2°C | 25.2°C | 32.2°C | 21.4°C | 11 mm | 63% | 4 m/s | 4.8 |
| 2001 | 28.2°C | 26.0°C | 23.9°C | 31.6°C | 21.4°C | 9 mm | 59% | 4.3 m/s | 4.5 |
| 2000 ❄️ | 25.2°C | 22.7°C | 20.2°C | 28.4°C | 18.0°C | 26 mm | 64% | 6.4 m/s | 4.7 |
| 1999 | 27.2°C | 25.1°C | 23.0°C | 29.4°C | 21.3°C | 58 mm | 69% | 4.2 m/s | 4.4 |
| 1998 🔥 | 29.3°C | 27.6°C | 26.0°C | 32.2°C | 23.4°C | 54 mm | 68% | 4.1 m/s | 4 |
| 1997 | 27.2°C | 25.6°C | 24.0°C | 29.8°C | 22.1°C | 24 mm | 66% | 4.3 m/s | 4.1 |
| 1996 | 28.1°C | 25.8°C | 23.4°C | 30.8°C | 20.9°C | 0 mm | 56% | 4 m/s | 5 |
| 1995 | 27.1°C | 24.9°C | 22.6°C | 29.7°C | 19.9°C | 3 mm | 60% | 5.4 m/s | 4.7 |
| 1994 | 28.7°C | 26.1°C | 23.5°C | 31.4°C | 21.5°C | 0 mm | 53% | 4.2 m/s | 5.1 |
| 1993 | 27.1°C | 25.3°C | 23.5°C | 29.7°C | 20.3°C | 43 mm | 65% | 4.5 m/s | 4.2 |
| 1992 | 27.1°C | 25.1°C | 23.1°C | 29.8°C | 19.8°C | 43 mm | 66% | 4 m/s | 3.6 |
| 1991 | 28.8°C | 26.6°C | 24.5°C | 32.7°C | 22.8°C | 43 mm | 58% | 4 m/s | 4.5 |
| 1990 | 28.6°C | 26.1°C | 23.6°C | 33.6°C | 20.3°C | 0 mm | 54% | 4.7 m/s | 4.8 |
| 1989 | 27.7°C | 25.4°C | 23.0°C | 29.8°C | 21.1°C | 11 mm | 60% | 4.1 m/s | 4.7 |
| 1988 | 26.9°C | 25.1°C | 23.3°C | 29.2°C | 20.2°C | 101 mm | 65% | 4.4 m/s | 3.9 |
| 1987 | 27.6°C | 25.2°C | 22.8°C | 31.7°C | 18.9°C | 40 mm | 53% | 5.3 m/s | 4.1 |
| 1986 | 27.8°C | 25.1°C | 22.3°C | 29.6°C | 19.9°C | 0 mm | 51% | 4.6 m/s | 4.9 |
| 1985 | 27.8°C | 25.4°C | 23.0°C | 31.2°C | 21.2°C | 11 mm | 55% | 4.2 m/s | 4.5 |
| 1984 | 28.8°C | 26.9°C | 24.9°C | 31.4°C | 21.3°C | 51 mm | 64% | 3.4 m/s | 4.1 |
| 1983 | 28.3°C | 25.8°C | 23.3°C | 30.3°C | 21.0°C | 1 mm | 56% | 3.8 m/s | — |
| 1982 | 28.3°C | 26.2°C | 24.2°C | 31.2°C | 19.2°C | 70 mm | 59% | 4.2 m/s | — |
| 1981 | 27.9°C | 25.7°C | 23.5°C | 31.9°C | 19.5°C | 12 mm | 57% | 4.3 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 27.8°C with lows near 23.4°C (mean 25.6°C), based on 45 years of NASA POWER data.
May averages 30 mm of rainfall in Karratha, about average for rainfall. The wettest on record was 167 mm in 2022.
The hottest May reached 33.6°C in 1990. The coldest dipped to 18°C in 2000.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have fallen by about 0.3°C. Daytime highs moved from 28.2°C to 27.9°C and overnight lows from 23.8°C to 23.6°C over the same span.
May is one of the cooler months of the year in Karratha and about average for rainfall, so plan for around 27.8°C daytime highs and 23.4°C at night.
Not quite — May is the 5th coolest month in Karratha, averaging 25.6°C.
For May in Karratha, pack light layers you can adjust through the day, with typical highs of 27.8°C and lows of 23.4°C.
Relative humidity in May averages 60% — moderately humid.
Average wind speed in May is 4.5 m/s. The windiest May on record averaged 6.4 m/s (2000).
The wettest May on record was 2022 with 167 mm. On average, May sees 30 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 Karratha 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.
