Portland Airport climate by month
Averages and records for each calendar month at Portland Airport, Australia, from 1982 to 2026. The warmest month is February, averaging 22.6°C; the coolest is July at 13.2°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 22.2°C | 12.5°C | 42.1°C4 January 2013 | 1.6°C3 January 2009 | 44 / 44 |
| February | 22.6°C | 12.8°C | 43.1°C16 February 1983 | 4.1°C16 February 1985 | 43 / 44 |
| March | 21.2°C | 11.8°C | 40.5°C17 March 2008 | 2.5°C1 March 2001 | 44 / 44 |
| April | 18.6°C | 9.9°C | 34.2°C9 April 2005 | 1.2°C20 April 2013 | 44 / 44 |
| May | 16.0°C | 8.4°C | 26.8°C4 May 1990 | 0.0°C29 May 1990 | 44 / 44 |
| June | 13.8°C | 6.9°C | 20.6°C10 June 1987 | −1.5°C13 June 1996 | 44 / 45 |
| July | 13.2°C | 6.3°C | 18.7°C8 July 1994 | −2.3°C21 July 2005 | 45 / 45 |
| August | 14.1°C | 6.8°C | 24.4°C20 August 1995 | −1.1°C1 August 2024 | 45 / 45 |
| September | 15.3°C | 7.6°C | 31.0°C26 September 1987 | −0.6°C17 September 2019 | 44 / 45 |
| October | 17.0°C | 8.4°C | 32.8°C24 October 2019 | −0.9°C10 October 2006 | 44 / 44 |
| November | 18.7°C | 10.0°C | 35.5°C29 November 2012 | 1.5°C14 November 2012 | 44 / 44 |
| December | 20.2°C | 11.0°C | 38.5°C30 December 2019 | 0.9°C7 December 2006 | 44 / 44 |
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 43 to 45 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.