Perth Weather in September
In September, Perth averages a high of 20°C (69°F) and a low of 10°C (50°F), from 54 years of daily records (1971–2026).
20°C
Average high
69°F
10°C
Average low
50°F
32°C
Record high
90°F · September 9, 2015
1°C
Record low
34°F · September 22, 2008
What September Is Like in Perth
- September 2026 was the 3rd warmest September in 54 years of records, 1.5°C (2.7°F) above the long-run average.
- The warmest September in the record was 2023; the coldest was 2016.
At least 1 mm of rain falls on 35% of September days, and the month averages 79 mm in total.
Warmest: 1987 (22.6°C)Latest: 2026 (21.7°C)10-year averageLong-run average (20.5°C)
Look Up a Day in September
See the weather in Perth on any September date, year by year.
Source: NOAA GHCN-Daily, Perth Metro (1993–2026); Perth Regional Office (1971–1992). Averages cover 1971–2026. How we compute this