May is one of the cooler months of the year in Katanning, with average highs near 19.2°C and lows around 8.3°C (mean 13.8°C). It is a relatively wet time of year, averaging 51 mm of rainfall and 74% relative humidity across the period.
May is one of the cooler months of the year in Katanning. Across 45 years of records, the warmest May in Katanning was 2024 — when the month averaged 15.8°C — while the coldest was 2015 at 12.2°C. Typical May days reach 19.2°C with nights near 8.3°C. The long-term May temperature trend is broadly flat.
May is a relatively wet time of year in Katanning, averaging 51 mm of rainfall. The wettest May on record was 2005 with 118 mm, while the driest was 2000 at 11 mm.
Relative humidity in Katanning during May averages 74%. The most humid May was 2014 at 85%, and the least humid was 2018 at 62%.
May receives about 3.1 kWh/m²/day of solar energy in Katanning. The sunniest May was 2009 at 3.5 kWh/m²/day, and the cloudiest were 1999 and 2014 at 2.6.
Average wind speed in Katanning during May is 3.1 m/s. The windiest May was 1984 at 3.9 m/s, while the calmest were 2000 and 2008 at 2.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 13.4°C | 13.8°C | 14.0°C | 13.5°C | 14.1°C | +0.7°C |
| Avg High | 18.7°C | 19.0°C | 19.6°C | 19.0°C | 19.6°C | +0.9°C |
| Avg Low | 8.0°C | 8.5°C | 8.4°C | 7.9°C | 8.5°C | +0.5°C |
| Avg Rain | 52 mm | 53 mm | 42 mm | 47 mm | 67 mm | +15 mm |
May temperatures in Katanning have risen by about 0.9°C between 1981–1985 and 2021–2025.
May has ranged from a record low of 1.6°C (2019) to a record high of 29.3°C (2025).
Rainfall in May is a relatively wet time of year, averaging 51 mm, with a wettest year of 118 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.2°C per decade while lows rose 0°C per decade, widening the gap between day and night.
A good time to visit Katanning
May is a good time to visit Katanning, with days averaging 19.2°C and nights around 8.3°C (mean 13.8°C, cooler than Katanning's yearly average) and moderate rainfall. December and February 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 | 21.2°C | 14.9°C | 8.5°C | 29.3°C | 3.2°C | 30 mm | 70% | 3.1 m/s | 3.3 |
| 2024 🔥 | 21.3°C | 15.8°C | 10.4°C | 25.2°C | 6.8°C | 64 mm | 71% | 3 m/s | 3 |
| 2023 | 19.1°C | 13.5°C | 7.8°C | 24.6°C | 4.0°C | 28 mm | 75% | 2.7 m/s | 3.1 |
| 2022 | 18.8°C | 13.5°C | 8.1°C | 24.3°C | 5.1°C | 80 mm | 76% | 2.8 m/s | 3 |
| 2021 | 18.6°C | 13.8°C | 8.9°C | 23.5°C | 4.3°C | 86 mm | 79% | 2.9 m/s | 2.7 |
| 2020 | 18.6°C | 13.0°C | 7.4°C | 28.2°C | 3.5°C | 112 mm | 74% | 3.6 m/s | 3.2 |
| 2019 | 19.3°C | 13.0°C | 6.6°C | 27.0°C | 1.6°C | 17 mm | 69% | 2.7 m/s | 3.4 |
| 2018 | 21.2°C | 14.7°C | 8.2°C | 28.9°C | 3.8°C | 41 mm | 62% | 3.4 m/s | 3.3 |
| 2017 | 19.6°C | 14.0°C | 8.4°C | 27.0°C | 5.1°C | 37 mm | 74% | 3.1 m/s | 3.2 |
| 2016 | 17.7°C | 12.4°C | 7.1°C | 23.7°C | 2.8°C | 58 mm | 80% | 3.1 m/s | 3.1 |
| 2015 ❄️ | 17.6°C | 12.2°C | 6.8°C | 21.7°C | 2.9°C | 32 mm | 75% | 2.8 m/s | 3.1 |
| 2014 | 18.1°C | 13.8°C | 9.5°C | 21.7°C | 4.0°C | 92 mm | 85% | 3.2 m/s | 2.6 |
| 2013 | 18.4°C | 13.4°C | 8.4°C | 24.3°C | 4.7°C | 72 mm | 79% | 2.9 m/s | 2.9 |
| 2012 | 19.7°C | 13.9°C | 8.1°C | 26.6°C | 4.3°C | 46 mm | 74% | 2.7 m/s | 3.1 |
| 2011 | 19.6°C | 14.2°C | 8.8°C | 24.7°C | 5.0°C | 40 mm | 75% | 2.9 m/s | 3.1 |
| 2010 | 19.3°C | 13.4°C | 7.4°C | 26.2°C | 4.1°C | 37 mm | 71% | 2.7 m/s | 3.2 |
| 2009 | 20.8°C | 14.4°C | 8.0°C | 25.4°C | 5.0°C | 31 mm | 63% | 2.9 m/s | 3.5 |
| 2008 | 19.8°C | 14.4°C | 8.9°C | 26.3°C | 6.8°C | 69 mm | 80% | 2.6 m/s | 2.9 |
| 2007 | 18.0°C | 13.2°C | 8.3°C | 23.8°C | 4.3°C | 18 mm | 78% | 3.2 m/s | 3 |
| 2006 | 19.4°C | 13.4°C | 7.3°C | 25.3°C | 4.4°C | 16 mm | 71% | 2.8 m/s | 3.2 |
| 2005 🌧️ | 20.0°C | 15.2°C | 10.3°C | 26.9°C | 7.1°C | 118 mm | 82% | 3.2 m/s | 2.8 |
| 2004 | 18.6°C | 13.2°C | 7.7°C | 27.1°C | 3.3°C | 38 mm | 72% | 3.3 m/s | 2.9 |
| 2003 | 20.6°C | 14.9°C | 9.2°C | 27.5°C | 5.0°C | 51 mm | 69% | 3.2 m/s | 3.1 |
| 2002 | 20.3°C | 14.4°C | 8.6°C | 29.2°C | 4.8°C | 21 mm | 75% | 3.2 m/s | 3.2 |
| 2001 | 19.8°C | 14.1°C | 8.5°C | 28.8°C | 4.3°C | 49 mm | 75% | 2.8 m/s | 3 |
| 2000 | 18.9°C | 13.2°C | 7.5°C | 24.5°C | 4.3°C | 11 mm | 71% | 2.6 m/s | 3.3 |
| 1999 | 19.5°C | 14.6°C | 9.7°C | 27.0°C | 3.8°C | 71 mm | 77% | 3.3 m/s | 2.6 |
| 1998 | 20.6°C | 14.8°C | 8.9°C | 26.6°C | 4.0°C | 29 mm | 74% | 3.1 m/s | 3 |
| 1997 | 18.2°C | 13.3°C | 8.5°C | 25.8°C | 4.6°C | 58 mm | 78% | 3.6 m/s | 2.8 |
| 1996 | 20.6°C | 14.6°C | 8.5°C | 28.5°C | 3.8°C | 28 mm | 64% | 3 m/s | 3.1 |
| 1995 | 18.1°C | 12.6°C | 7.1°C | 24.8°C | 1.9°C | 55 mm | 73% | 3.3 m/s | 3.4 |
| 1994 | 20.0°C | 14.4°C | 8.7°C | 26.3°C | 5.1°C | 83 mm | 75% | 3.3 m/s | 3.1 |
| 1993 | 18.0°C | 13.0°C | 8.0°C | 22.8°C | 3.3°C | 81 mm | 79% | 3 m/s | 2.9 |
| 1992 | 17.4°C | 12.8°C | 8.1°C | 21.7°C | 3.2°C | 42 mm | 80% | 3.2 m/s | 2.9 |
| 1991 | 18.9°C | 13.9°C | 8.9°C | 26.9°C | 3.8°C | 37 mm | 73% | 3.3 m/s | 3 |
| 1990 | 19.1°C | 13.7°C | 8.3°C | 25.8°C | 2.9°C | 41 mm | 77% | 2.7 m/s | 3.1 |
| 1989 | 18.8°C | 13.6°C | 8.4°C | 24.2°C | 4.1°C | 79 mm | 77% | 2.8 m/s | 3 |
| 1988 | 17.9°C | 13.5°C | 9.2°C | 23.4°C | 6.4°C | 94 mm | 84% | 3.8 m/s | 2.7 |
| 1987 | 18.0°C | 12.5°C | 7.0°C | 23.1°C | 4.1°C | 24 mm | 73% | 2.9 m/s | 3.1 |
| 1986 | 19.0°C | 13.6°C | 8.2°C | 24.0°C | 5.1°C | 41 mm | 74% | 3.3 m/s | 3 |
| 1985 | 19.3°C | 13.2°C | 7.0°C | 25.5°C | 4.0°C | 34 mm | 64% | 2.9 m/s | 3.2 |
| 1984 | 17.5°C | 12.9°C | 8.3°C | 21.0°C | 4.3°C | 81 mm | 79% | 3.9 m/s | 3 |
| 1983 | 20.5°C | 14.5°C | 8.5°C | 27.7°C | 3.3°C | 22 mm | 71% | 3.2 m/s | — |
| 1982 | 18.9°C | 13.3°C | 7.7°C | 24.4°C | 2.5°C | 18 mm | 72% | 2.9 m/s | — |
| 1981 | 18.5°C | 13.2°C | 7.8°C | 25.8°C | 3.5°C | 71 mm | 70% | 3.6 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 19.2°C with lows near 8.3°C (mean 13.8°C), based on 45 years of NASA POWER data.
May averages 51 mm of rainfall in Katanning, a relatively wet time of year. The wettest on record was 118 mm in 2005.
The hottest May reached 29.3°C in 2025. The coldest dipped to 1.6°C in 2019.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 0.9°C. Daytime highs moved from 18.9°C to 19.8°C and overnight lows from 7.9°C to 8.7°C over the same span.
May is one of the cooler months of the year in Katanning and a relatively wet time of year, so plan for around 19.2°C daytime highs and 8.3°C at night.
Not quite — May is the 5th coolest month in Katanning, averaging 13.8°C.
For May in Katanning, pack light layers you can adjust through the day, with typical highs of 19.2°C and lows of 8.3°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 74% — moderately humid.
Average wind speed in May is 3.1 m/s. The windiest May on record averaged 3.9 m/s (1984).
The wettest May on record was 2005 with 118 mm. On average, May sees 51 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 Katanning 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.
