Rottnest Island Aws climate by month
Averages and records for each calendar month at Rottnest Island Aws, Australia, from 1983 to 2026. The warmest month is February, averaging 27.3°C; the coolest is July at 17.9°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 26.7°C | 19.2°C | 41.9°C30 January 1991 | 11.3°C5 January 1999 | 36 / 38 |
| February | 27.3°C | 19.5°C | 41.5°C26 February 1997 | 10.0°C17 February 1991 | 37 / 38 |
| March | 26.2°C | 18.8°C | 40.8°C22 March 2004 | 5.9°C6 March 1991 | 37 / 38 |
| April | 23.7°C | 17.2°C | 35.2°C11 April 2020 | 4.0°C22 April 1991 | 38 / 38 |
| May | 21.2°C | 15.3°C | 29.2°C2 May 2003 | 6.5°C31 May 1991 | 36 / 38 |
| June | 18.8°C | 13.4°C | 24.9°C3 June 1984 | 3.9°C21 June 1991 | 36 / 38 |
| July | 17.9°C | 12.5°C | 23.4°C26 July 2001 | 6.0°C28 July 2025 | 38 / 38 |
| August | 18.0°C | 12.4°C | 28.3°C31 August 2023 | 6.1°C10 August 1991 | 36 / 38 |
| September | 19.0°C | 13.0°C | 32.8°C27 September 2023 | 6.7°C4 September 1999 | 36 / 38 |
| October | 20.6°C | 14.1°C | 34.0°C25 October 2023 | 6.7°C27 October 1991 | 37 / 37 |
| November | 23.1°C | 15.9°C | 37.0°C22 November 2023 | 6.6°C20 November 1992 | 37 / 37 |
| December | 25.2°C | 17.8°C | 42.5°C26 December 2021 | 10.8°C5 December 2015 | 35 / 36 |
Years shows the number behind the average high, then the number holding a record for that month. They differ because a year contributes an average only when the month has at least 25 days of readings, while a single reading is enough to set a record. The average low is withheld on the same 25-day rule and is counted separately again; it is shown as a dash where the archive cannot support it. Across the twelve months here the averages rest on 35 to 38 years each.
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Every figure on this page is computed from NOAA GHCN-Daily observations stored per station, per year, per month. Nothing is modelled, interpolated or estimated, and a month the archive never covered is left out rather than filled in. A station appears here only once all twelve months carry an average from at least 10 years. See how this is built.