Sydney Intl climate by month
Averages and records for each calendar month at Sydney Intl, Australia, from 1939 to 2026. The warmest month is January, averaging 26.8°C; the coolest is July at 17.2°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 26.8°C | 19.0°C | 46.4°C18 January 2013 | 9.7°C18 January 1949 | 87 / 87 |
| February | 26.6°C | 19.2°C | 42.9°C10 February 2017 | 11.2°C24 February 1964 | 87 / 87 |
| March | 25.5°C | 17.7°C | 41.2°C9 March 1983 | 7.4°C24 March 1967 | 87 / 87 |
| April | 23.1°C | 14.4°C | 36.8°C9 April 2018 | 6.1°C21 April 1965 | 88 / 88 |
| May | 20.2°C | 11.2°C | 30.0°C13 May 1957 | 3.0°C22 May 1965 | 88 / 88 |
| June | 17.7°C | 8.8°C | 26.8°C5 June 1958 | 1.0°C21 June 1961 | 88 / 88 |
| July | 17.2°C | 7.5°C | 27.0°C22 July 2016 | −0.1°C23 July 1943 | 88 / 88 |
| August | 18.5°C | 8.4°C | 31.6°C30 August 2024 | 1.2°C9 August 1960 | 88 / 88 |
| September | 20.8°C | 10.7°C | 35.9°C19 September 2023 | 2.3°C1 September 1967 | 87 / 88 |
| October | 22.8°C | 13.5°C | 39.1°C13 October 2004 | 4.8°C8 October 1966 | 87 / 87 |
| November | 24.3°C | 15.6°C | 43.4°C25 November 1982 | 5.9°C15 November 1949 | 87 / 87 |
| December | 26.0°C | 17.7°C | 43.5°C9 December 2023 | 8.2°C7 December 1943 | 87 / 87 |
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 87 to 88 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.